{"id":382,"date":"2020-04-26T20:04:11","date_gmt":"2020-04-26T12:04:11","guid":{"rendered":"http:\/\/adeqing.com\/?p=382"},"modified":"2020-04-26T20:04:14","modified_gmt":"2020-04-26T12:04:14","slug":"%e5%89%8d%e7%ab%af%e5%b9%b2%e8%b4%a7%e5%88%86%e4%ba%ab%ef%bc%8c%e5%b8%a6%e4%bd%a0%e9%a2%86%e7%95%a5%e5%89%8d%e7%ab%af%e9%ad%85%e5%8a%9b","status":"publish","type":"post","link":"https:\/\/adeqing.com\/index.php\/2020\/04\/26\/default\/382\/","title":{"rendered":"\u524d\u7aef\u5e72\u8d27\u5206\u4eab\uff0c\u5e26\u4f60\u9886\u7565\u524d\u7aef\u9b45\u529b"},"content":{"rendered":"\n<div data-v-7407bc26=\"\" data-id=\"5ea1a51451882573972886f2\" itemprop=\"articleBody\" class=\"article-content\"><h1 class=\"heading\" data-id=\"heading-0\">\u524d\u7aef\u5e72\u8d27\u5206\u4eab\uff0c\u5e26\u4f60\u9886\u7565\u524d\u7aef\u9b45\u529b\uff01<\/h1>\n<h2 class=\"heading\" data-id=\"heading-1\">\u524d\u8a00<\/h2>\n<p>\u672c\u7bc7\u6587\u7ae0\u5c5e\u4e8e<strong>\u77e5\u8bc6\u603b\u7ed3<\/strong>\u578b\uff0c\u5f52\u7eb3\u51fa\u8bb8\u591a\u6bd4\u8f83\u96f6\u6563\u7684\u77e5\u8bc6\u70b9\uff0c\u90fd\u662f<strong>\u5e72\u8d27<\/strong>\u5662~<\/p>\n<p>\u5982\u679c\u4f60\u662f\u5c0f\u767d\u90a3\u4e48\u8fd9\u7bc7\u6587\u7ae0\u6b63\u597d\u9002\u5408\u4f60\uff0c\u5982\u679c\u4f60\u662f\u8001\u624b\u90a3\u4e48\u4e0d\u59a8\u5de9\u56fa\u4e00\u4e0b\u770b\u770b\u8fd8\u6709\u54ea\u4e9b\u8fb9\u89d2\u6599\u6ca1\u8865\uff01<\/p>\n<p>\u5efa\u8bae\uff1a\u9002\u5408<strong>\u6709js\u57fa\u7840<\/strong>\u7684\u5c0f\u4f19\u4f34\u89c2\u770b\uff0c<strong>\u7bc7\u5e45\u8f83\u957f<\/strong>\uff0c\u5efa\u8bae\u5148<strong>\u6536\u85cf<\/strong>\u518d\u6162\u6162\u6d4f\u89c8<\/p>\n<blockquote>\n<p>\u6574\u6574\u82b1\u4e86\u4e00\u5468\u65f6\u95f4\u603b\u7ed3\u4e86\u4e00\u4e9b\u6bd4\u8f83\u91cd\u70b9\u4e5f\u6709\u4e9b\u6bd4\u8f83\u504f\u7684\u77e5\u8bc6\uff0c\u5e0c\u671b\u5404\u4f4d\u5c0f\u4f19\u4f34\u6162\u6162\u54c1\u5c1d\uff0c\u5982\u679c\u6709\u4e0d\u5bf9\u7684\u5730\u65b9\u6216\u8005\u662f\u9700\u8981\u4f18\u5316\u7684\u5730\u65b9\u671b\u8bf7\u544a\u77e5\uff0c\u5c3d\u91cf\u7ed9\u5927\u5bb6\u5448\u73b0\u6700\u6709\u4ef7\u503c\u7684\u6587\u7ae0\u3002\u4e2a\u4eba\u6c34\u5e73\u6709\u9650\uff0c\u8fd8\u8bf7\u5404\u4f4d\u5927\u4f6c\u6307\u70b9\u8ff7\u6d25\u3002\u5e0c\u671b\u5404\u4f4d\u770b\u4e86\u8fd9\u7bc7\u6587\u7ae0\u80fd\u6709\u81ea\u5df1\u7684\u60f3\u6cd5\uff0c\u5728\u524d\u7aef\u9053\u8def\u4e0a\u8fd8\u5f88\u6f2b\u957f\uff0c\u4e0e\u6211\u4e00\u540c\u63a2\u7d22\u5427\uff01<\/p>\n<\/blockquote>\n<h2 class=\"heading\" data-id=\"heading-2\">\u76ee\u5f55<\/h2>\n<p>\u4e00\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#1\">\u53d8\u91cf\u7c7b\u578b<\/a><\/p>\n<p>\u4e8c\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#2\">\u6df1\u62f7\u8d1d\u4e0e\u6d45\u62f7\u8d1d<\/a><\/p>\n<p>\u4e09\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#3\">\u539f\u578b\u4e0e\u539f\u578b\u94fe<\/a><\/p>\n<p>\u56db\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#4\">\u7ee7\u627f\u4e0e\u5b9e\u73b0<\/a><\/p>\n<p>\u4e94\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#5\">\u5b9e\u73b0class\u4e0eextends<\/a><\/p>\n<p>\u516d\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#6\">\u4f5c\u7528\u57df\u3001\u6267\u884c\u4e0a\u4e0b\u6587\u4e0e\u95ed\u5305<\/a><\/p>\n<p>\u4e03\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#7\">this<\/a><\/p>\n<p>\u516b\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#8\">apply\u3001call\u3001bind\u5b9e\u73b0<\/a><\/p>\n<p>\u4e5d\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#9\">\u540c\u6b65\u4e0e\u5f02\u6b65<\/a><\/p>\n<p>\u5341\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#10\">AMD\u3001CMD\u3001CommonJS\u4e0eES6\u6a21\u5757\u5316<\/a><\/p>\n<p>\u5341\u4e00\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#11\">script\u6807\u7b7e\u4e4basync\u4e0edefer<\/a><\/p>\n<p>\u5341\u4e8c\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#12\">\u6539\u53d8\u6570\u7ec4\u672c\u8eab\u7684api<\/a><\/p>\n<p>\u5341\u4e09\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#13\">window\u4e4blocation\u3001navigator<\/a><\/p>\n<p>\u5341\u56db\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#14\">ajax\u4e0efetch<\/a><\/p>\n<p>\u5341\u4e94\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#15\">WebSocket<\/a><\/p>\n<p>\u5341\u516d\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#16\">\u77ed\u8f6e\u8be2\u3001\u957f\u8f6e\u8be2\u4e0eWebSocket<\/a><\/p>\n<p>\u5341\u4e03\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#17\">\u957f\u8fde\u63a5\u4e0e\u77ed\u8fde\u63a5<\/a><\/p>\n<p>\u5341\u516b\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#18\">\u5b58\u50a8<\/a><\/p>\n<p>\u5341\u4e5d\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#19\">\u8de8\u57df<\/a><\/p>\n<p>\u4e8c\u5341\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#20\">setTimeout\u4e0esetInterval<\/a><\/p>\n<p>\u4e8c\u5341\u4e00\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#21\">requestAnimationFrame<\/a><\/p>\n<p>\u4e8c\u5341\u4e8c\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#22\">\u4e8b\u4ef6<\/a><\/p>\n<p>\u4e8c\u5341\u4e09\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#23\">\u603b\u7ed3<\/a><\/p>\n<p>\u4e8c\u5341\u56db\u3001 <a href=\"https:\/\/juejin.im\/post\/5e9f0bdce51d4546f5791989?utm_source=gold_browser_extension#24\">\u5176\u4ed6\u6587\u7ae0<\/a><\/p>\n<h2 class=\"heading\" data-id=\"heading-3\"><span id=\"1\">\u4e00\u3001\u53d8\u91cf\u7c7b\u578b<\/span><\/h2>\n<h3 class=\"heading\" data-id=\"heading-4\"><strong>==\u4e0e===<\/strong><\/h3>\n<h4 class=\"heading\" data-id=\"heading-5\">\u5bf9\u4e8e==\u7684\u5224\u65ad<\/h4>\n<ul>\n<li>\u5e76\u4e0d\u662f\u90a3\u4e48\u4e25\u8c28\u7684\u5224\u65ad\u5de6\u53f3\u4e24\u7aef\u662f\u5426\u76f8\u7b49<\/li>\n<li>\u5b83\u4f1a\u4f18\u5148\u5bf9\u6bd4\u6570\u636e\u7684\u7c7b\u578b\u662f\u5426\u4e00\u81f4<\/li>\n<li>\u4e0d\u4e00\u81f4\u5219<strong>\u8fdb\u884c\u9690\u5f0f\u8f6c\u6362<\/strong>\uff0c\u4e00\u81f4\u5219\u5224\u65ad\u503c\u7684\u5927\u5c0f\uff0c\u5f97\u51fa\u7ed3\u679c<\/li>\n<li>\u7ee7\u7eed\u5224\u65ad\u4e24\u4e2a\u7c7b\u578b\u662f\u5426\u4e3anull\u4e0eundefined\uff0c\u5982\u679c\u662f\u5219\u8fd4\u56detrue<\/li>\n<li>\u63a5\u7740\u5224\u65ad\u662f\u5426\u4e3astring\u4e0enumber\uff0c\u5982\u679c\u662f\u628astring\u8f6c\u6362\u4e3anumber\u518d\u5bf9\u6bd4\u5927\u5c0f<\/li>\n<li>\u5224\u65ad\u5176\u4e2d\u4e00\u65b9\u662f\u5426\u4e3aboolean\uff0c\u5982\u679c\u662f\u5c31\u8f6c\u4e3anumber\u518d\u8fdb\u4e00\u6b65\u5224\u65ad<\/li>\n<li>\u5224\u65ad\u4e00\u65b9\u662f\u5426\u4e3aobject\uff0c\u53e6\u4e00\u65b9\u4e3astring\u3001number\u3001symbol\uff0c\u5982\u679c\u662f\u5219\u628aobject\u8f6c\u4e3a\u539f\u59cb\u7c7b\u578b\u518d\u5224\u65ad<\/li>\n<\/ul>\n<h5 class=\"heading\" data-id=\"heading-6\">\u6bd4\u8f83\u60c5\u51b5<\/h5>\n<ol>\n<li>\u6570\u7ec4 == \u503c\uff0c(\u503c\u7c7b\u578b\u6307\u7684\u662f\u539f\u59cb\u7c7b\u578b)\u4f1a\u5148\u8f6c\u6210\u6570\u503c\u518d\u6bd4\u8f83\uff0c\u4e0e\u5b57\u7b26\u4e32\u6bd4\u8f83\u4f1a\u5148\u8f6c\u6210\u5b57\u7b26\u4e32\u518d\u6bd4\u8f83<\/li>\n<li>\u5f15\u7528 == \u503c\uff0c\u4f1a\u628a\u5f15\u7528\u7c7b\u578b\u8f6c\u6210\u539f\u59cb\u7c7b\u578b\u518d\u6bd4\u8f83<\/li>\n<li>\u503c == \u503c\uff0c\u76f4\u63a5\u6bd4\u8f83\u7c7b\u578b\u518d\u6bd4\u8f83\u503c\u7684\u5927\u5c0f<\/li>\n<li>\u5b57\u7b26\u4e32 == \u6570\u5b57\uff0c\u5219\u628a\u5b57\u7b26\u4e32\u8f6c\u4e3a\u6570\u503c\u518d\u6bd4\u8f83<\/li>\n<li>\u5176\u4ed6\u7c7b\u578b == boolean\uff0c\u5219\u628aboolean\u8f6c\u6210\u6570\u503c\u518d\u8fdb\u4e00\u6b65\u6bd4\u8f83<\/li>\n<li>undefined == null\uff0c\u4e5f\u4f1a\u53d1\u751f\u9690\u5f0f\u8f6c\u6362\uff0c\u4e142\u8005\u53ef\u4ee5\u76f8\u4e92\u8f6c\u6362\uff0c\u53732\u8005\u76f8\u7b49\uff0c\u4e0e\u81ea\u8eab\u4e5f\u76f8\u7b49<\/li>\n<li>\u5bf9\u8c61 == \u975e\u5bf9\u8c61\uff0c\u5982\u679c\u975e\u5bf9\u8c61\u4e3astring\u6216number\uff0c\u5219\u8fd4\u56deToPrimitive(\u5bf9\u8c61) == \u975e\u5bf9\u8c61\uff0c\u7684\u7ed3\u679c\uff1bToPrimitive\u65b9\u6cd5\u7684\u53c2\u6570\u5982\u679c\u662f\u539f\u59cb\u7c7b\u578b\u5219\u76f4\u63a5\u8fd4\u56de\uff1b\u5982\u679c\u662f\u5bf9\u8c61\uff0c\u5219\u8c03\u7528valueOf\u65b9\u6cd5\uff0c\u5982\u679c\u662f\u539f\u59cb\u503c\u518d\u8fdb\u884c\u539f\u59cb\u7c7b\u578b\u8f6c\u6362\u548c\u5927\u5c0f\u5bf9\u6bd4\uff1b\u5982\u679c\u4e0d\u662f\u539f\u59cb\u503c\u5219\u8c03\u7528toString\uff0c\u4e14\u7ed3\u679c\u4e3a\u539f\u59cb\u503c\u5219\u8fdb\u884c\u539f\u59cb\u7c7b\u578b\u6bd4\u8f83\uff0c\u5982\u679c\u4e0d\u662f\u539f\u59cb\u503c\u5219\u629b\u51fa\u9519\u8bef<\/li>\n<\/ol>\n<pre><code class=\"hljs \u6bd4\u8f83 copyable\" lang=\"\u6bd4\u8f83\">\/\/ \u4ee5\u4e0b\u7ed3\u679c\u90fd\u4e3atrue\nconsole.log([5]==5,['5']==5)\nconsole.log({name:'5'}=='[object Object]')\nconsole.log('5'==5,true==1,false==0)\nconsole.log(undefined==null)\nconsole.log([5,6]=='5,6',['5','6']=='5,6')\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><blockquote>\n<p>\u5927\u767d\u8bdd\uff1a\u4f18\u5148\u6bd4\u8f83\u7c7b\u578b\uff0c\u540c\u7c7b\u578b\uff0c\u6bd4\u5927\u5c0f\uff0c\u975e\u539f\u59cb\uff0c\u8c03ToPrimitive\uff0c\u4e3a\u5bf9\u8c61\u8c03valueOf\uff0c\u8fd8\u975e\u539f\u59cb\u8c03toString\uff0c\u6700\u540e\u8fd8\u975e\u539f\u59cb\u5219\u62a5\u9519\uff0c\u5982\u679c\u4e3a\u539f\u59cb\u5219\u8fdb\u884c\u7c7b\u578b\u5bf9\u6bd4\uff0c\u5982\u679c\u4e0d\u540c\u7c7b\u578b\u518d\u8f6c\u6362\uff0c\u4e4b\u540e\u5bf9\u6bd4\u5927\u5c0f\u3002<\/p>\n<\/blockquote>\n<p>\u6240\u8c13==\u6bd4\u8f83\u5c31\u662f\u8981\u8f6c\u6362\u6210\u540c\u7c7b\u578b\u6bd4\u8f83\uff0c\u5982\u679c\u65e0\u6cd5\u8f6c\u6210\u540c\u7c7b\u578b\u5c31\u62a5\u9519<\/p>\n<blockquote>\n<p>\u4f18\u5148\u6bd4\u7c7b\u578b\uff0c\u518d\u6bd4null\u4e0eundefined\uff0c\u518d\u6bd4string\u548cnumber\uff0c\u518d\u6bd4boolean\u4e0eany\uff0c\u518d\u6bd4object\u4e0estring\u3001number\u3001symbol\uff1b\u4ee5\u4e0a\u5982\u679c\u8f6c\u4e3a\u539f\u59cb\u7c7b\u578b\u6bd4\u8f83\uff0c\u5219\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\uff0c\u76f4\u5230\u7c7b\u578b\u76f8\u540c\u518d\u6bd4\u8f83\u503c\u7684\u5927\u5c0f\u3002\u8fd9\u5c31\u662f==\u7684\u9690\u5f0f\u8f6c\u6362\u5bf9\u6bd4\uff0c\u6bd4\u8f83\u7ed5\uff0c\u7ed9\u4e2a\u56fe\u5c31\u6e05\u6670\u4e86\uff01<\/p>\n<\/blockquote>\n<p>\u5982\u4e0b\u4e3a\u5224\u65ad\u6b65\u9aa4<\/p>\n<p><\/p><figure><img decoding=\"async\" alt=\"==\u4e0e===\" class=\"lazyload inited loaded\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d4f703af20a1?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"1005\" data-height=\"426\" src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d4f703af20a1?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\"><figcaption><\/figcaption><\/figure><p><\/p>\n<p>\u601d\u8003\uff1f\u5982\u4f55\u5224\u65ad\u6b64\u8868\u8fbe\u5f0f\uff08\u6ce8\u610f==!\u4e0e!==\uff09\n<strong>[]==![]<\/strong><\/p>\n<ul>\n<li>\u57fa\u4e8e\u8fd0\u7b97\u7b26\u7684\u4f18\u5148\u7ea7\u6b64\u5f0f\u4f1a\u5148\u8fd0\u7b97![]\u7684\u7ed3\u679c<\/li>\n<li>!\u4f18\u5148\u4e8e==\uff0c\u4e14[]\u4e3a\u771f\u503c(\u8f6c\u6210boolean\uff0c\u7ed3\u679c\u4e3atrue\u7684\u5c31\u4e3a\u771f\u503c\uff0c\u5305\u62ec{}\uff1b\u8f6c\u6210false\u7684\u5c31\u4e3a\u5047\u503c)\uff0c![]\u7ed3\u679c\u4e3afalse\uff0c\u6240\u4ee5\u5f53\u524d\u8868\u8fbe\u5f0f\u8f6c\u5316\u4e3a []==false<\/li>\n<li>\u901a\u8fc7\u4e4b\u524d\u603b\u7ed3\u7684\u8f6c\u6362\u5173\u7cfb\uff0c\u4efb\u4f55\u7c7b\u578b\u4e0eboolean\u7c7b\u578b\u6bd4\u8f83\uff0c\u6240\u4ee5[]==false \u8f6c\u5316\u4e3a []==0 \u6bd4\u8f83<\/li>\n<li>\u6b64\u65f6\u53d8\u4e3aobject\u4e0e0\u6bd4\u8f83\uff0c\u8c03\u7528object\u7684\u8f6c\u6362\u6210\u539f\u59cb\u7c7b\u578b\u7684\u65b9\u6cd5valueOf\u5176\u7ed3\u679c\u8fd8\u662fvalueOf<\/li>\n<li>\u518d\u8c03\u7528toString\u7ed3\u679c\u4e3a&#8221;\uff0c\u518d\u8fdb\u884cstring\u8f6c\u6210number\uff0c\u5219[]\u8f6c\u6210\u6570\u5b57\u7c7b\u578b0<\/li>\n<li>\u8868\u8fbe\u5f0f\u8fdb\u4e00\u6b65\u8f6c\u6362\u62100==0\uff0c\u7ed3\u679c\u4e3atrue\u3002<\/li>\n<\/ul>\n<p>\u867d\u7136\u8fc7\u7a0b\u590d\u6742\uff0c\u8bb0\u4f4f\u5224\u65ad\u7684\u601d\u8def\u5373\u53ef\uff0c\u975e\u5bf9\u8c61\u4e4b\u95f4\uff0c\u5148\u7c7b\u578b\u8f6c\u6362\u518d\u6bd4\u5927\u5c0f\uff0c\u5bf9\u8c61\u6bd4\u8f83\u5219\u8c03\u7528\u83b7\u53d6\u539f\u59cb\u503c\u65b9\u6cd5\u518d\u8fdb\u4e00\u6b65\u6bd4\u8f83\u3002<\/p>\n<p>\u5982\u4e0b\u4e3atoString\u4e0evalueOf\u8f6c\u6362<\/p>\n<p><\/p><figure><img decoding=\"async\" alt=\"ToPrimitive\u8f6c\u6362\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d4e8d3757d58?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"1095\" data-height=\"815\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;1095&quot; height=&quot;815&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<h4 class=\"heading\" data-id=\"heading-7\">\u5bf9\u4e8e===\u7684\u5224\u65ad<\/h4>\n<ul>\n<li>===\u5c5e\u4e8e<strong>\u4e25\u683c\u5224\u65ad<\/strong>\uff0c\u76f4\u63a5\u5224\u65ad\u4e24\u8005\u7c7b\u578b\u662f\u5426\u76f8\u540c\uff0c\u4e0d\u540c\u5219\u8fd4\u56defalse<\/li>\n<li>\u5982\u679c\u76f8\u540c\u518d\u6bd4\u8f83\u5927\u5c0f\uff0c<strong>\u4e0d\u4f1a\u8fdb\u884c\u4efb\u4f55\u9690\u5f0f\u8f6c\u6362<\/strong><\/li>\n<li>\u5bf9\u4e8e\u5f15\u7528\u7c7b\u578b\u6765\u8bf4\uff0c\u6bd4\u8f83\u7684\u90fd\u662f\u5f15\u7528\u5185\u5b58\u5730\u5740\uff0c\u6240\u4ee5===\u8fd9\u79cd\u65b9\u5f0f\u7684\u6bd4\u8f83\uff0c\u9664\u975e\u4e24\u8005\u5b58\u50a8\u7684\u5185\u5b58\u5730\u5740\u76f8\u540c\u624d\u76f8\u7b49\uff0c\u53cd\u4e4bfalse<\/li>\n<\/ul>\n<pre><code class=\"hljs \u6bd4\u8f83 copyable\" lang=\"\u6bd4\u8f83\">const a=[]\nconst b=a\na===b \/\/true\n---------------\nconst a=[]\nconst b=[]\na===b \/\/false\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h4 class=\"heading\" data-id=\"heading-8\">7\u5927\u539f\u59cb\u7c7b\u578b\u4e0eObject\u7c7b\u578b<\/h4>\n<ol>\n<li>Boolean<\/li>\n<li>Null<\/li>\n<li>Undefined<\/li>\n<li>Number<\/li>\n<li>BigInt<\/li>\n<li>String<\/li>\n<li>Symbol<\/li>\n<li><strong>Object<\/strong><\/li>\n<\/ol>\n<h4 class=\"heading\" data-id=\"heading-9\">\u7c7b\u578b\u5224\u65ad<\/h4>\n<h5 class=\"heading\" data-id=\"heading-10\">\u539f\u59cb\u7c7b\u578b\u5224\u65ad<\/h5>\n<ul>\n<li><strong>\u539f\u59cb\u7c7b\u578b<\/strong>string\u3001number\u3001undefined\u3001boolean\u3001symbol\u3001bigint\u90fd\u80fd<strong>\u901a\u8fc7typeof<\/strong>(\u8fd4\u56de\u5b57\u7b26\u4e32\u5f62\u5f0f)\u76f4\u63a5\u5224\u65ad\u7c7b\u578b\uff0c\u8fd8\u6709\u5bf9\u8c61\u7c7b\u578bfunction\u4e5f\u53ef\u5224\u65ad<\/li>\n<li><strong>\u9664\u4e86null<\/strong>\u65e0\u6cd5\u901a\u8fc7typeof(\u4e3aobject)\u76f4\u63a5\u5224\u65ad\u7c7b\u578b(\u5386\u53f2\u9057\u7559)\uff0c\u5305\u62ec\u5bf9\u8c61\u7c7b\u578b\uff0ctypeof\u628anull\u5f53\u4f5c\u5bf9\u8c61\u7c7b\u578b\u5904\u7406\uff0c\u6240\u4ee5typeof\u65e0\u6cd5\u5224\u65ad\u5bf9\u8c61\u7c7b\u578b\uff0c<strong>typeof\u4e5f\u80fd\u5224\u65adfunction<\/strong><\/li>\n<\/ul>\n<h5 class=\"heading\" data-id=\"heading-11\">\u975e\u539f\u59cb\u7c7b\u578b\u5224\u65ad(\u4ee5\u53canull)<\/h5>\n<p>\u5224\u65ad\u6570\u7ec4<\/p>\n<ul>\n<li>\u4f7f\u7528<code>Array.isArray()<\/code>\u5224\u65ad\u6570\u7ec4<\/li>\n<li>\u4f7f\u7528<code>[] instanceof Array<\/code>\u5224\u65ad\u662f\u5426\u5728Array\u7684\u539f\u578b\u94fe\u4e0a\uff0c\u5373\u53ef\u5224\u65ad\u662f\u5426\u4e3a\u6570\u7ec4<\/li>\n<li><code>[].constructor === Array<\/code>\u901a\u8fc7\u5176\u6784\u9020\u51fd\u6570\u5224\u65ad\u662f\u5426\u4e3a\u6570\u7ec4<\/li>\n<li>\u4e5f\u53ef\u4f7f\u7528<code>Object.prototype.toString.call([])<\/code>\u5224\u65ad\u503c\u662f\u5426\u4e3a'[object Array]&#8217;\u6765\u5224\u65ad\u6570\u7ec4<\/li>\n<\/ul>\n<p>\u5224\u65ad\u5bf9\u8c61<\/p>\n<ul>\n<li><code>Object.prototype.toString.call({})<\/code>\u7ed3\u679c\u4e3a'[object Object]&#8217;\u5219\u4e3a\u5bf9\u8c61<\/li>\n<li><code>{} instanceof Object<\/code>\u5224\u65ad\u662f\u5426\u5728Object\u7684\u539f\u578b\u94fe\u4e0a\uff0c\u5373\u53ef\u5224\u65ad\u662f\u5426\u4e3a\u5bf9\u8c61<\/li>\n<li><code>{}.constructor === Object<\/code>\u901a\u8fc7\u5176\u6784\u9020\u51fd\u6570\u5224\u65ad\u662f\u5426\u4e3a\u5bf9\u8c61<\/li>\n<\/ul>\n<p>\u5224\u65ad\u51fd\u6570<\/p>\n<ul>\n<li>\u4f7f\u7528<code>func typeof function<\/code>\u5224\u65adfunc\u662f\u5426\u4e3a\u51fd\u6570<\/li>\n<li>\u4f7f\u7528<code>func instanceof Function<\/code>\u5224\u65adfunc\u662f\u5426\u4e3a\u51fd\u6570<\/li>\n<li>\u901a\u8fc7<code>func.constructor === Function<\/code>\u5224\u65ad\u662f\u5426\u4e3a\u51fd\u6570<\/li>\n<li>\u4e5f\u53ef\u4f7f\u7528<code>Object.prototype.toString.call(func)<\/code>\u5224\u65ad\u503c\u662f\u5426\u4e3a'[object Function]&#8217;\u6765\u5224\u65adfunc<\/li>\n<\/ul>\n<p>\u5224\u65adnull<\/p>\n<ul>\n<li>\u6700\u7b80\u5355\u7684\u662f\u901a\u8fc7<code>null===null<\/code>\u6765\u5224\u65ad\u662f\u5426\u4e3anull<\/li>\n<li><code>(!a &amp;&amp; typeof (a) != 'undefined' &amp;&amp; a != 0)<\/code>\u5224\u65ada\u662f\u5426\u4e3anull<\/li>\n<li><code>Object.prototype.__proto__===a<\/code>\u5224\u65ada\u662f\u5426\u4e3a\u539f\u59cb\u5bf9\u8c61\u539f\u578b\u7684\u539f\u578b\u5373null<\/li>\n<\/ul>\n<p>\u5224\u65ad\u662f\u5426\u4e3aNaN<\/p>\n<ul>\n<li><code>isNaN(any)<\/code>\u76f4\u63a5\u8c03\u7528\u6b64\u65b9\u6cd5\u5224\u65ad\u662f\u5426\u4e3a\u975e\u6570\u503c<\/li>\n<\/ul>\n<p>\u4e00\u4e9b\u5176\u4ed6\u5224\u65ad<\/p>\n<ul>\n<li><code>Object.is(a,b)<\/code>\u5224\u65ada\u4e0eb\u662f\u5426\u5b8c\u5168\u76f8\u7b49\uff0c\u4e0e===\u57fa\u672c\u76f8\u540c\uff0c\u4e0d\u540c\u70b9\u5728\u4e8eObject.is\u5224\u65ad<code>+0\u4e0d\u7b49\u4e8e-0<\/code>\uff0c<code>NaN\u7b49\u4e8e\u81ea\u8eab<\/code><\/li>\n<li>\u4e00\u4e9b\u5176\u4ed6\u5bf9\u8c61\u7c7b\u578b\u53ef\u4ee5\u57fa\u4e8e\u539f\u578b\u94fe\u5224\u65ad\u548c\u6784\u9020\u51fd\u6570\u5224\u65ad<\/li>\n<li><code>prototypeObj.isPrototypeOf(object)<\/code>\u5224\u65adobject\u7684\u539f\u578b\u662f\u5426\u4e3aprototypeObj\uff0c\u4e0d\u540c\u4e8einstanceof\uff0c\u6b64\u65b9\u6cd5\u76f4\u63a5\u5224\u65ad\u539f\u578b\uff0c\u800c\u975einstanceof \u5224\u65ad\u7684\u662f\u53f3\u8fb9\u7684\u539f\u578b\u94fe<\/li>\n<\/ul>\n<p>\u4e00\u4e2a\u7b80\u5355\u7684\u7c7b\u578b\u9a8c\u8bc1\u51fd\u6570<\/p>\n<pre><code class=\"hljs \u7b80\u5355\u7684\u9a8c\u8bc1\u7c7b\u578b\u51fd\u6570 copyable\" lang=\"\u7b80\u5355\u7684\u9a8c\u8bc1\u7c7b\u578b\u51fd\u6570\">function isWho(x) {\n  \/\/ null\n  if (x === null) return 'null'\n  const primitive = ['number', 'string', 'undefined',\n    'symbol', 'bigint', 'boolean', 'function'\n  ]\n  let type = typeof x\n  \/\/\u539f\u59cb\u7c7b\u578b\u4ee5\u53ca\u51fd\u6570\n  if (primitive.includes(type)) return type\n  \/\/\u5bf9\u8c61\u7c7b\u578b\n  if (Array.isArray(x)) return 'array'\n  if (Object.prototype.toString.call(x) === '[object Object]') return 'object'\n  if (x.hasOwnProperty('constructor')) return x.constructor.name\n  const proto = Object.getPrototypeOf(x)\n  if (proto) return proto.constructor.name\n  \/\/ \u65e0\u6cd5\u5224\u65ad\n  return \"can't get this type\"\n}\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h2 class=\"heading\" data-id=\"heading-12\"><span id=\"2\">\u4e8c\u3001\u6df1\u62f7\u8d1d\u4e0e\u6d45\u62f7\u8d1d<\/span><\/h2>\n<p>\u5728\u9879\u76ee\u4e2d\u6709\u8bb8\u591a\u5730\u65b9\u9700\u8981\u6570\u636e\u514b\u9686\uff0c\u7279\u522b\u662f\u5f15\u7528\u7c7b\u578b\u5bf9\u8c61\uff0c\u6211\u4eec\u65e0\u6cd5\u4f7f\u7528\u666e\u901a\u7684\u8d4b\u503c\u65b9\u5f0f\u514b\u9686\uff0c\u867d\u7136\u6211\u4eec\u4e00\u822c\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93\u5982lodash\u6765\u5b9e\u73b0\u6df1\u62f7\u8d1d\uff0c\u4f46\u662f\u6211\u4eec\u4e5f\u9700\u8981\u77e5\u9053\u4e00\u4e9b\u5176\u4e2d\u7684\u539f\u7406<\/p>\n<h3 class=\"heading\" data-id=\"heading-13\">\u6d45\u62f7\u8d1d<\/h3>\n<ul>\n<li><code>Object.assign({},obj)<\/code>\u6d45\u62f7\u8d1dobject<\/li>\n<li><code>obj1={...obj2}<\/code>\u901a\u8fc7spread\u5c55\u5f00\u8fd0\u7b97\u7b26\u6d45\u62f7\u8d1dobj2<\/li>\n<li><code>Object.fromEntries(Object.entries(obj))<\/code>\u901a\u8fc7\u751f\u6210\u8fed\u4ee3\u5668\u518d\u901a\u8fc7\u8fed\u4ee3\u5668\u751f\u6210\u5bf9\u8c61<\/li>\n<li><code>Object.create({},Object.getOwnPropertyDescriptors(obj))<\/code>\u6d45\u62f7\u8d1dobj<\/li>\n<li><code>Object.defineProperties({},Object.getOwnPropertyDescriptors(obj))<\/code>\u6d45\u62f7\u8d1dobj<\/li>\n<\/ul>\n<p>\u7b80\u5355\u5b9e\u73b0\u6d45\u62f7\u8d1d<\/p>\n<pre><code class=\"hljs \u6d45\u62f7\u8d1d copyable\" lang=\"\u6d45\u62f7\u8d1d\">\/\/ a\u539f\u62f7\u8d1d\u5bf9\u8c61\uff0cb\u65b0\u5bf9\u8c61\nfor (const key in a) {\n  b[key] = a[key]\n}\n------------------------------------------\nfor (const key of Object.keys(a)) {\n  b[key] = a[key]\n}\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p><strong>\u6d45\u62f7\u8d1d<\/strong>\u53ea\u62f7\u8d1d\u4e00\u5c42\u5c5e\u6027\u5bf9\u4e8e<strong>\u5f15\u7528\u7c7b\u578b\u65e0\u6cd5\u62f7\u8d1d<\/strong><\/p>\n<h3 class=\"heading\" data-id=\"heading-14\">\u6df1\u62f7\u8d1d<\/h3>\n<ul>\n<li><code>JSON.parse(JSON.stringify(obj))<\/code>\u901a\u8fc7<strong>JSON\u76842\u6b21\u8f6c\u6362<\/strong>\u6df1\u62f7\u8d1dobj\uff0c\u4e0d\u8fc7\u65e0\u6cd5\u62f7\u8d1d<strong>undefined<\/strong>\u4e0e<strong>symbol<\/strong>\u5c5e\u6027\uff0c\u65e0\u6cd5\u62f7\u8d1d<strong>\u5faa\u73af\u5f15\u7528<\/strong>\u5bf9\u8c61<\/li>\n<li>\u81ea\u5df1\u5b9e\u73b0\u6df1\u62f7\u8d1d<\/li>\n<\/ul>\n<p>\u7b80\u5355\u6df1\u62f7\u8d1d<\/p>\n<pre><code class=\"hljs \u7b80\u5355\u6df1\u62f7\u8d1d copyable\" lang=\"\u7b80\u5355\u6df1\u62f7\u8d1d\">\/\/\u7b80\u5355\u7248\u6df1\u62f7\u8d1d\uff0c\u53ea\u80fd\u62f7\u8d1d\u57fa\u672c\u539f\u59cb\u7c7b\u578b\u548c\u666e\u901a\u5bf9\u8c61\u4e0e\u6570\u7ec4\uff0c\u65e0\u6cd5\u62f7\u8d1d\u5faa\u73af\u5f15\u7528\nfunction simpleDeepClone(a) {\n  const b=Array.isArray(a) ? [] : {}\n  for (const key of Object.keys(a)) {\n    const type = typeof a[key]\n    if (type !== 'object' || a[key] === null) {\n      b[key] = a[key]\n    } else {\n      b[key] = simpleDeepClone(a[key])\n    }\n  }\n  return b\n}\n\/\/\u7cbe\u7b80\u7248\u6df1\u62f7\u8d1d\u53ea\u80fd\u62f7\u8d1d\u57fa\u672c\u539f\u59cb\u7c7b\u578b\u548c\u666e\u901a\u5bf9\u8c61\u4e0e\u6570\u7ec4\uff0c\u53ef\u4ee5\u62f7\u8d1d\u5faa\u73af\u5f15\u7528\nfunction deepClone(a, weakMap = new WeakMap()) {\n  if (typeof a !== 'object' || a === null) return a\n  if (s = weakMap.get(a)) return s\n  const b = Array.isArray(a) ? [] : {}\n  weakMap.set(a, b)\n  for (const key of Object.keys(a)) b[key] = clone(a[key], weakMap)\n  return b\n}\n\/\/js\u539f\u751f\u6df1\u62f7\u8d1d\uff0c\u65e0\u6cd5\u62f7\u8d1dSymbol\u3001null\u3001\u5faa\u73af\u5f15\u7528\nfunction JSdeepClone(data) {\n  if (!data || !(data instanceof Object) || (typeof data == \"function\")) {\n    return data || undefined;\n  }\n  const constructor = data.constructor;\n  const result = new constructor();\n  for (const key in data) {\n    if (data.hasOwnProperty(key)) {\n      result[key] = deepClone(data[key]);\n    }\n  }\n  return result;\n}\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p>\u6bd4\u8f83\u5b8c\u5584\u7684\u6df1\u62f7\u8d1d<\/p>\n<pre><code class=\"hljs \u5177\u4f53\u6df1\u62f7\u8d1d copyable\" lang=\"\u5177\u4f53\u6df1\u62f7\u8d1d\">\/\/\u6df1\u62f7\u8d1d\u5177\u4f53\u7248\uff0c\u975e\u5b8c\u5168\uff0c\u4f46\u5927\u90e8\u5206\u90fd\u53ef\u4ee5\nfunction deepClonePlus(a, weakMap = new WeakMap()) {\n  const type = typeof a\n  if (a === null || type !== 'object') return a\n  if (s = weakMap.get(a)) return s\n  const allKeys = Reflect.ownKeys(a)\n  const newObj = Array.isArray(a) ? [] : {}\n  weakMap.set(a, newObj)\n  for (const key of allKeys) {\n    const value = a[key]\n    const T = typeof value\n    if (value === null || T !== 'object') {\n      newObj[key] = value\n      continue\n    }\n    const objT = Object.prototype.toString.call(value)\n    if (objT === '[object Object]' || objT === '[object Array]') {\n      newObj[key] = deepClonePlus(value, weakMap)\n      continue\n    }\n    if (objT === '[object Set]' || objT === '[object Map]') {\n      if (objT === '[object Set]') {\n        newObj[key] = new Set()\n        value.forEach(v =&gt; newObj[key].add(deepClonePlus(v, weakMap)))\n      } else {\n        newObj[key] = new Map()\n        value.forEach((v, i) =&gt; newObj[key].set(i, deepClonePlus(v, weakMap)))\n      }\n      continue\n    }\n    if (objT === '[object Symbol]') {\n      newObj[key] = Object(Symbol.prototype.valueOf.call(value))\n      continue\n    }\n    newObj[key] = new a[key].constructor(value)\n  }\n  return newObj\n}\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p>\u5228\u6790\u6df1\u62f7\u8d1d(\u4e2a\u4eba\u601d\u8def)<\/p>\n<ul>\n<li>\u672c\u4eba\u4f7f\u7528\u9012\u5f52\u7b97\u6cd5\u6765\u5b9e\u4e60\u6df1\u62f7\u8d1d\uff0c\u7531\u4e8e\u4f7f\u7528\u9012\u5f52\uff0c\u4f1a\u8ba9\u4ee3\u7801\u770b\u8d77\u6765\u66f4\u52a0\u6613\u61c2\uff0c\u5728\u4e0d\u89e6\u53ca\u8c03\u7528\u6808\u6ea2\u51fa\u7684\u60c5\u51b5\u4e0b\uff0c\u63a8\u8350\u4f7f\u7528\u9012\u5f52<\/li>\n<li>\u6df1\u62f7\u8d1d\uff0c\u5176\u5b9e\u8003\u9a8c\u7684\u5c31\u662f\u5982\u4f55\u628a\u5f15\u7528\u7c7b\u578b\u7ed9\u62f7\u8d1d\u8fc7\u6765\uff0c\u8fd8\u6709Symbol\u7c7b\u578b\u6bd4\u8f83\u7279\u6b8a\uff0c\u5982\u4f55\u5b9e\u73b0\u4e00\u4e2a\u6bd4\u8f83\u5b8c\u6574\u7684\u6df1\u62f7\u8d1d\u5c31\u8981\u6d89\u53ca<strong>\u4e0d\u540c\u7c7b\u578b<\/strong>\u7684\u62f7\u8d1d\u65b9\u5f0f<\/li>\n<\/ul>\n<ol>\n<li>\u9996\u5148\u8003\u8651\u7b80\u5355\u7684<strong>\u539f\u59cb\u7c7b\u578b<\/strong>\uff0c\u7531\u4e8e\u539f\u59cb\u7c7b\u578b\u5728\u5185\u5b58\u4e2d\u4fdd\u5b58\u7684\u662f\u503c\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7\u503c\u7684\u8d4b\u503c\u64cd\u4f5c\uff0c\u5148\u5224\u65ad\u4f20\u5165\u53c2\u6570\u662f\u5426\u4e3a\u539f\u59cb\u7c7b\u578b\uff0c\u5305\u62ecnull\u8fd9\u91cc\u5f52\u4e3a\u539f\u59cb\u7c7b\u578b\u6765\u5224\u65ad\uff0c\u6ca1\u5fc5\u8981\u8fdb\u5165\u5bf9\u8c61\u73af\u8282\uff0c\u51fd\u6570\u76f4\u63a5\u8d4b\u503c\u4e0d\u5f71\u54cd\u4f7f\u7528<\/li>\n<li>\u7ecf\u8fc7\u539f\u59cb\u7c7b\u578b\u7684\u7b5b\u9009\uff0c\u5269\u4e0b<strong>\u5bf9\u8c61\u7c7b\u578b<\/strong>\uff0c\u53d6\u51fa\u6240\u6709\u5bf9\u8c61\u7684\u952e\uff0c\u901a\u8fc7<code>Reflect.OwnKeys(obj)<\/code>\u53d6\u51fa\u5bf9\u8c61\u81ea\u8eab\u6240\u6709\u7684\u952e\uff0c\u5305\u62ecSymbol\u7684\u952e\u4e5f\u80fd\u53d6\u51fa<\/li>\n<li>\u7531\u4e8e\u5bf9\u8c61\u67092\u79cd\u4f53\u73b0\u5f62\u5f0f\uff0c<strong>\u6570\u7ec4<\/strong>\u548c<strong>\u666e\u901a\u5bf9\u8c61<\/strong>\uff0c\u5bf9\u4e8e\u8fd92\u8005\u8981\u5355\u72ec\u5224\u65ad\uff0c\u5148\u751f\u6210\u4e00\u4e2a\u62f7\u8d1d\u5bb9\u5668\u5373newObj<\/li>\n<li>\u63a5\u4e0b\u6765\u5c31\u53ef\u4ee5\u5f00\u59cb\u904d\u5386 \u6b65\u9aa42 \u4e2d\u83b7\u53d6\u5230\u5bf9\u8c61\u6240\u6709\u7684\u952e(\u4ec5\u81ea\u8eab\u5305\u542b\u7684\u952e),\u901a\u8fc7for..of \u904d\u5386\uff0c\u53d6\u51fa\u5f53\u524d\u8981\u62f7\u8d1d\u7684\u5bf9\u8c61a\uff0c\u5bf9\u5e94\u4e8e\u5f53\u524d\u904d\u5386\u952e\u7684\u503c\uff0c\u5373a[key]<\/li>\n<li>\u5bf9a[key]\u503c\u7684\u7c7b\u578b\u8fdb\u884c\u5224\u65ad\uff0c\u6b64\u503c\u7c7b\u578b\u7684\u53ef\u80fd\u6027\u5305\u62ec\u6240\u6709\u7684\u7c7b\u578b\uff0c\u6240\u4ee5\u53c8\u56de\u5230\u6b65\u9aa41\u4e2d\u5148\u5224\u65ad\u539f\u59cb\u7c7b\u578b\u6570\u636e\uff1b\u5982\u679c\u662f\u539f\u59cb\u7c7b\u578b\u53ef\u4ee5\u76f4\u63a5\u8d4b\u503c\u8df3\u8fc7\u8fd9\u4e00\u8f6e\uff0c\u8fdb\u884c\u4e0b\u4e00\u8f6e\u904d\u5386<\/li>\n<li>\u7ecf\u8fc7\u4e0a\u4e00\u6b65\u7684\u7b5b\u9009\uff0c\u6b64\u65f6\u5269\u4e0b\u7684\u53ea\u662f\u5bf9\u8c61\u7c7b\u578b,\u7531\u4e8e\u5bf9\u8c61\u7c7b\u578b\u65e0\u6cd5\u901a\u8fc7typeof\u76f4\u63a5\u533a\u5206\uff0c\u6240\u4ee5\u53ef\u4ee5\u501f\u7528\u539f\u59cb\u5bf9\u8c61\u539f\u578b\u65b9\u6cd5 <code>Object.prototype.toString.call(obj)<\/code> \u6765\u8fdb\u884c<strong>\u5bf9\u8c61\u5177\u4f53\u7c7b\u578b<\/strong>\u7684\u5224\u65ad<\/li>\n<li>toString\u5224\u65ad\u7684\u7ed3\u679c\u4f1a\u4ee5'[object xxx]&#8217;\uff0cxxx\u4e3a\u5bf9\u5e94\u5bf9\u8c61\u7c7b\u578b\u5f62\u5f0f\u4f53\u73b0\uff0c\u57fa\u4e8e\u8fd9\u79cd\u8f6c\u6362\u53ef\u4ee5\u6e05\u6670\u5224\u65ad\u5bf9\u8c61\u7684\u5177\u4f53\u7c7b\u578b\uff0c\u4e4b\u540e\u518d\u5bf9\u5404\u79cd\u7c7b\u578b\u8fdb\u884c\u76f8\u5e94\u7684\u6df1\u62f7\u8d1d\u5373\u53ef<\/li>\n<li>\u4ee5\u4e0a\u5e76\u672a\u4f7f\u7528\u9012\u5f52\uff0c\u7531\u4e8e\u4e0a\u8ff0\u7684\u62f7\u8d1d\uff0c\u8fd8\u672a\u6d89\u53ca\u591a\u5c42\u6b21\u7684\u5d4c\u5957\u5173\u7cfb\u5e76\u4e0d\u9700\u8981\u4f7f\u7528\u9012\u5f52<\/li>\n<li>\u63a5\u4e0b\u6765\u5c06\u8981\u5224\u65ad<strong>\u5d4c\u5957\u7c7b\u578b<\/strong>\u6570\u636e\uff0c(\u6b64\u987a\u5e8f\u53ef\u53d8\uff0c\u4e0d\u8fc7\u51fa\u73b0\u9891\u7387\u9ad8\u7684\u5c3d\u91cf\u653e\u5728\u524d\u5934)\u9996\u5148\u5224\u65ad\u666e\u901a\u5bf9\u8c61\u548c\u6570\u7ec4\uff0c\u5982\u679c\u662f\uff0c\u5219\u76f4\u63a5\u6254\u7ed9\u9012\u5f52\u5904\u7406\uff0c\u7531\u4e8e\u5904\u7406\u6570\u7ec4\u548c\u666e\u901a\u5bf9\u8c61\u7684\u903b\u8f91\u5df2\u7ecf\u5728\u8fd9\u4e4b\u524d\u5904\u7406\u597d\u4e86\uff0c\u73b0\u5728\u53ea\u9700\u91cd\u590d\u4e0a\u9762\u7684\u6b65\u9aa4\uff0c\u6240\u4ee5\u76f4\u63a5<strong>\u9012\u5f52\u8c03\u7528<\/strong>\u5c31\u597d\uff0c\u9012\u5f52\u5230\u6700\u540e\u4e00\u5c42\uff0c\u5e94\u8be5\u662f\u539f\u59cb\u7c7b\u578b\u7684\u6570\u636e\uff0c\u4e0d\u4f1a\u8fdb\u5165\u65e0\u9650\u8c03\u7528<\/li>\n<li>\u63a5\u4e0b\u6765\u662f\u5224\u65ad2\u79cd<strong>\u7279\u6b8a\u7c7b\u578b<\/strong>Set\u548cMap\uff0c\u7531\u4e8e\u8fd92\u79cd\u7c7b\u578b\u7684\u62f7\u8d1d\u65b9\u5f0f\u4e0d\u540c\uff0c\u8fdb\u4e00\u6b65\u901a\u8fc7if\u5206\u652f\u5bf9\u5176\u5224\u65ad\uff0c\u904d\u5386\u91cc\u8fb9\u6240\u5b58\u653e\u7684\u503c\uff0cSet\u4f7f\u7528add\u65b9\u6cd5\u5411\u65b0\u7684\u62f7\u8d1d\u5bb9\u5668\u6dfb\u52a0\u4e0e\u62f7\u8d1d\u5bf9\u8c61\u76f8\u540c\u7684\u503c\uff0c\u6b64\u5904\u503c\u7684\u62f7\u8d1d\u4e5f\u5e94\u8be5\u4f7f\u7528\u6df1\u62f7\u8d1d\uff0c\u5373\u76f4\u63a5\u628a\u503c\u4e22\u7ed9\u9012\u5f52\u51fd\u6570\uff0c\u5b83\u5c31\u4f1a\u8fd4\u56de\u4e00\u4e2a\u62f7\u8d1d\u597d\u7684\u503c\u3002Map\u7c7b\u4f3c\uff0c\u8c03\u7528set\u65b9\u6cd5\u8bbe\u7f6e\u952e\u548c\u503c\uff0c\u4e0d\u8fc7\u6b63\u597dMap\u7684\u952e\u53ef\u4ee5\u5b58\u653e\u5404\u79cd\u7c7b\u578b<\/li>\n<li>\u5230\u4e86\u62f7\u8d1dSymbol\u73af\u8282\uff0c\u8fd9\u4e2a\u7c7b\u578b\u76f8\u5bf9\u7279\u6b8a\u4e00\u70b9\uff0cSymbol\u7684\u503c\u662f\u552f\u4e00\u7684\uff0c\u6240\u4ee5\u8981\u83b7\u53d6\u539fSymbol\u6240\u5bf9\u5e94\u7684Symbol\u503c\uff0c\u5219\u5fc5\u987b\u901a\u8fc7\u501f\u7528Symbol\u7684\u539f\u578b\u65b9\u6cd5\u6765\u6307\u660e\u8981\u83b7\u53d6Symbol\u6240\u5bf9\u5e94Symbol\u7684\u539f\u59cb\u503c\uff0c\u57fa\u4e8e\u539f\u59cb\u503c\u521b\u5efa\u4e00\u4e2a\u5305\u88c5\u5668\u5bf9\u8c61\uff0c\u5219\u8fd9\u4e2a\u5bf9\u8c61\u7684\u503c\u4e0e\u539f\u6765\u76f8\u540c<\/li>\n<li>\u7b5b\u9009\u5230\u8fd9\u91cc\uff0c\u5269\u4f59\u7684\u5bf9\u8c61\uff0c\u57fa\u672c\u4e0a\u5c31\u662f\u4e00\u4e9b\u5185\u7f6e\u5bf9\u8c61\u6216\u8005\u662f\u4e0d\u9700\u8981\u9012\u5f52\u904d\u5386\u5c5e\u6027\u7684\u5bf9\u8c61\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u57fa\u4e8e\u8fd9\u4e9b\u5bf9\u8c61<strong>\u539f\u578b\u7684\u6784\u9020\u51fd\u6570<\/strong>\u6765\u5b9e\u4f8b\u5316\u76f8\u5e94\u7684\u5bf9\u8c61<\/li>\n<li>\u6700\u540e\u904d\u5386\u5b8c\u6240\u6709\u7684\u5c5e\u6027\u5c31\u53ef\u4ee5\u8fd4\u56de\u8fd9\u4e2a\u62f7\u8d1d\u540e\u7684\u65b0\u5bb9\u5668\u5bf9\u8c61\uff0c\u4f5c\u4e3a\u62f7\u8d1d\u5bf9\u8c61\u7684\u66ff\u4ee3<\/li>\n<li>\u57fa\u4e8e\u5faa\u73af\u5f15\u7528\u5bf9\u8c61\u7684\u89e3\u6790\uff0c\u7531\u4e8e\u5faa\u73af\u5f15\u7528\u5bf9\u8c61\u4f1a\u9020\u6210\u5faa\u73af\u9012\u5f52\u5bfc\u81f4\u8c03\u7528\u6808\u6ea2\u51fa\uff0c\u6240\u4ee5\u8981\u8003\u8651\u5230\u4e00\u4e2a\u5bf9\u8c61\u4e0d\u80fd\u88ab\u591a\u6b21\u62f7\u8d1d\u3002\u57fa\u4e8e\u8fd9\u4e2a\u6761\u4ef6\u53ef\u4ee5\u4f7f\u7528Map\u5bf9\u8c61\u6765\u4fdd\u5b58\u4e00\u4e2a\u62f7\u8d1d\u5bf9\u5e94\u7684\u8868\uff0c\u56e0\u4e3aMap\u7684\u952e\u7684\u7279\u6b8a\u6548\u679c\u53ef\u4ee5\u4fdd\u5b58\u5bf9\u8c61\uff0c\u56e0\u6b64\u6b63\u597d\u9002\u7528\u4e8e\u5bf9\u62f7\u8d1d\u5bf9\u8c61\u7684\u8bb0\u5f55\uff0c\u4e14\u503c\u5219\u662f\u5bf9\u5e94\u7684\u65b0\u62f7\u8d1d\u5bb9\u5668\uff0c\u5f53\u4e0b\u6b21\u9012\u5f52\u8fdb\u6765\u7684\u65f6\u5019\u5148\u5728\u62f7\u8d1d\u8868\u91cc\u67e5\u8be2\u8fd9\u4e2a\u952e\u662f\u5426\u5b58\u5728\uff0c\u5982\u679c\u5b58\u5728\u8bf4\u660e\u5df2\u7ecf\u62f7\u8d1d\u8fc7\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u4e4b\u524d\u62f7\u8d1d\u7684\u7ed3\u679c\uff0c\u53cd\u4e4b\u7ee7\u7eed<\/li>\n<li>\u7531\u4e8eMap\u5b58\u653e\u7684\u952e\u5c5e\u4e8e<strong>\u5f3a\u5f15\u7528\u7c7b\u578b<\/strong>\uff0c\u4e14\u6df1\u62f7\u8d1d\u7684\u6570\u636e\u91cf\u4e5f\u4e0d\u5c0f\uff0c\u5982\u679c\u8fd9\u4e9b\u62f7\u8d1d\u540e\u7684\u62f7\u8d1d\u8868\u4e0d\u53ca\u65f6\u91ca\u653e\u53ef\u80fd\u4f1a\u9020\u6210\u5783\u573e\u5806\u79ef\u5f71\u54cd\u6027\u80fd\uff0c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class=\"hljs WeakMap copyable\" lang=\"WeakMap\">let obj = {\n  name: {\n    age: [{\n      who: 'me'\n    }]\n  }\n}\nlet wm = new WeakMap()\ndeepClonePlus(obj, wm)\nobj=null\nconsole.dir(wm) \/\/ No properties \u5373\u4e3a\u7a7a\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p>\u4ece\u4e0a\u9762\u53ef\u4ee5\u770b\u51fa\u5982\u679c\u539f\u62f7\u8d1d\u5bf9\u8c61\u88ab\u6e05\u7a7a\u90a3\u4e48WeakMap\u4fdd\u5b58\u7684\u62f7\u8d1d\u8868\u4e5f\u5c06\u88ab\u6e05\u7a7a\uff0c\u603b\u7684\u6765\u8bf4\u65b9\u4fbf\u4e00\u70b9\uff0c\u603b\u6bd4\u9ebb\u70e6\u4e00\u70b9\u597d<\/p>\n<p>\u770b\u770b\u8fd9\u79cd\u60c5\u51b5<\/p>\n<pre><code class=\"hljs WeakMap copyable\" lang=\"WeakMap\">const obj = {\n  name: {\n    age: [{\n      who: 'me'\n    }]\n  }\n}\nlet wm = new WeakMap()\nconsole.time('start')\nfor (let i = 0; i &lt; 1000000; i++) {\n  deepClonePlus(obj, wm) \/\/ wm\u4e3a\u624b\u52a8\u4f20\u5165\u7684weakmap\n  \/\/ \u6b64\u5904\u4e3a\u4e86\u4e0e\u4e0b\u9762\u5bf9\u6bd4\uff0c\u8fd9\u91cc\u6545\u610f\u91cd\u7f6eweakmap\u5b58\u50a8\u7684\u62f7\u8d1d\u503c\n  wm = new WeakMap() \n}\nconsole.timeEnd('start') \/\/ \u8017\u65f62645ms\n------------------------------------------------\nlet wm = new WeakMap()\nlet m\nconsole.time('start')\nfor (let i = 0; i &lt; 1000000; i++) {\n  deepClonePlus(obj, wm)\n  \/\/ \u6b64\u6b21\u4e3a\u5bf9\u7167\u7ec4\uff0c\u4e5f\u6267\u884c\u521b\u5efaWeakMap\u4f46\u662f\u4e0d\u91cd\u7f6e\u4e4b\u524d\u62f7\u8d1d\u7684wm\n  m = new WeakMap()\n}\nconsole.timeEnd('start') \/\/ \u8017\u65f673ms\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p>\u4ece\u4ee5\u4e0a\u5bf9\u6bd4\u53ef\u4ee5\u770b\u51fa\u5982\u679c\u662f\u591a\u6b21\u62f7\u8d1d\u540c\u4e00\u5bf9\u8c61\uff0c\u6700\u597d\u4f7f\u7528WeakMap\u6765\u5b58\u50a8\u62f7\u8d1d\u8868\uff0c\u90a3\u4e48\u4e4b\u540e\u7684\u6bcf\u6b21\u62f7\u8d1d\u53ea\u9700\u4ece\u62f7\u8d1d\u8868\u4e2d\u53d6\u51fa\u503c\u5373\u53ef\uff0c\u7531\u4e8e\u662f\u6d45\u62f7\u8d1d\u6240\u4ee5\u65f6\u95f4\u8f83\u77ed(<strong>\u6ce8\u610f\uff1a\u4e0d\u8fc7\u8fd9\u79cd\u76f4\u63a5\u4eceWeakMap\u4e2d\u53d6\u51fa\u7684\u503c\u5c5e\u4e8e\u6d45\u62f7\u8d1d\uff0c\u4f7f\u7528\u540c\u4e00\u4e2awm\u5bf9\u8c61\u62f7\u8d1d\u51fa\u6765\u7684\u90fd\u662f\u6d45\u62f7\u8d1d\uff0c\u5982\u679c\u6bcf\u4e2a\u90fd\u9700\u8981\u6df1\u62f7\u8d1d\u90a3\u4e48\u53ea\u80fd\u6bcf\u6b21\u91cd\u65b0\u521b\u5efaWeakMap<\/strong>)<\/p>\n<h2 class=\"heading\" data-id=\"heading-15\"><span id=\"3\">\u4e09\u3001\u539f\u578b\u4e0e\u539f\u578b\u94fe<\/span><\/h2>\n<h3 class=\"heading\" data-id=\"heading-16\">\u539f\u578b<\/h3>\n<ul>\n<li>\u53ea\u6709\u5bf9\u8c61\u7c7b\u578b\u624d\u6709\u539f\u578b\u6982\u5ff5<\/li>\n<li>\u666e\u901a\u5bf9\u8c61(\u5373\u4f7f\u7528\u5bf9\u8c61\u5b57\u9762\u91cf\u6216\u8005Object\u6784\u9020\u5668\u521b\u5efa\u7684\u5bf9\u8c61)\u7684\u539f\u578b\u4e3a<code>__proto__<\/code>\u5c5e\u6027\uff0c\u6b64\u5c5e\u6027\u5176\u5b9e\u662f\u4e2a\u8bbf\u95ee\u5668\u5c5e\u6027\uff0c\u5e76\u4e0d\u662f\u771f\u5b9e\u5b58\u5728\u7684\u5c5e\u6027\uff0c\u6216\u8005\u53ef\u4ee5\u4f7f\u7528es6\u7684<code>Reflect.getPrototypeOf(obj)<\/code>\u548c<code>Object.getPrototypeOf(obj)<\/code>\u65b9\u6cd5\u83b7\u53d6\u5bf9\u8c61\u7684\u539f\u578b\uff0c\u5176\u5173\u7cfb<code>Reflect.getPrototypeOf({}) === Object.getPrototypeOf({}) === {}.__proto__<\/code><\/li>\n<li>\u666e\u901a\u51fd\u6570\u67092\u4e2a\u5c5e\u6027\uff0c\u4e00\u4e2a\u662f\u662f<code>__proto__<\/code>(\u4e0e\u666e\u901a\u5bf9\u8c61\u7c7b\u4f3c)\uff0c\u8fd8\u6709\u4e00\u4e2a\u662f\u51fd\u6570\u4e13\u6709\u7684<code>prototype<\/code>\u5c5e\u6027\uff0c\u56e0\u4e3a\u51fd\u6570\u6709\u53cc\u91cd\u8eab\u4efd\uff0c\u5373\u53ef\u4ee5\u662f\u5b9e\u4f8b\u4e5f\u53ef\u4ee5\u662f\u6784\u9020\u5668\uff0c\u6240\u4ee5\u5173\u7cfb\u6bd4\u8f83\u7279\u6b8a<\/li>\n<li>\u4e0d\u662f\u6240\u6709\u7684\u5bf9\u8c61\u90fd\u4f1a\u6709\u539f\u578b\uff0c\u6bd4\u5982\u5bf9\u8c61\u539f\u578b<code>Object.prototype<\/code>\u7684\u539f\u578b<code>Object.prototype.__proto__<\/code>\u5c31\u6307\u5411null\uff0c\u5b57\u5178\u5bf9\u8c61\u7684\u539f\u578b\u4e5f\u4e3anull(\u628a\u5bf9\u8c61\u7684<code>__proto__<\/code>\u8bbe\u7f6e\u4e3anull\uff0c\u6216\u8005\u4f7f\u7528<code>Object.create(null)<\/code>\u521b\u5efa\u4e00\u4e2a\u6ca1\u6709\u539f\u578b\u7684\u5b57\u5178\u5bf9\u8c61\uff0c\u4f46\u662f\u8fd9\u4e2a\u5bf9\u8c61\u8fd8\u662f\u5c5e\u4e8e\u5bf9\u8c61\u7c7b\u578b)\uff0c\u6240\u4ee5\u539f\u59cb\u5bf9\u8c61\u539f\u578b(Object.prototype)\u5c31\u662f\u6700\u539f\u59cb\u7684\u539f\u578b\uff0c\u5176\u4ed6\u5bf9\u8c61\u7c7b\u578b\u90fd\u8981\u7ee7\u627f\u81ea\u5b83\u3002<\/li>\n<li>\u7bad\u5934\u51fd\u6570\u867d\u7136\u5c5e\u4e8e\u51fd\u6570\uff0c\u7531Function\u4ea7\u751f\uff0c\u4f46\u662f\u6ca1\u6709prototype\u5c5e\u6027\u6ca1\u6709\u6784\u9020\u5668\u7279\u6027\uff0c\u6240\u4ee5\u4e5f\u5c31\u6ca1\u6709\u6240\u8c13\u7684constructor\uff0c\u5c31\u4e0d\u80fd\u4f5c\u4e3a\u6784\u9020\u5668\u4f7f\u7528<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-17\">\u539f\u578b\u94fe<\/h3>\n<p>\u8fd9\u91cc\u4f1a\u8be6\u7ec6\u4ecb\u7ecd\u539f\u578b\u3001\u539f\u578b\u94fe\u3001\u5b9e\u4f8b\u3001\u6784\u9020\u5668\u7684\u5173\u7cfb\n\u5148\u770b\u6700\u539f\u59cb\u7684\u5173\u7cfb<\/p>\n<p><\/p><figure><img decoding=\"async\" alt=\"\u539f\u578b\u94fe\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d5011fdf60d7?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"697\" data-height=\"690\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;697&quot; height=&quot;690&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<p>\u7531\u5982\u4e0a\u5173\u7cfb\u53ef\u4ee5\u9a8c\u8bc1<code>console.log(Function.prototype.__proto__.constructor.__proto__.constructor === Function) \/\/true<\/code><\/p>\n<ul>\n<li>\u6240\u6709\u51fd\u6570\u90fd\u662f\u7531Function\u51fd\u6570\u6784\u9020\u5668\u5b9e\u4f8b\u5316\u800c\u6765<\/li>\n<li>\u6240\u6709\u5b9e\u4f8b\u7684\u539f\u578b\u90fd\u6307\u5411\u6784\u9020\u5b83\u7684\u6784\u9020\u5668\u7684prototype<\/li>\n<li>\u6bcf\u4e2a\u6784\u9020\u5668\u81ea\u8eab\u7279\u6709\u7684\u65b9\u6cd5\u5c31\u662f<strong>\u9759\u6001\u65b9\u6cd5<\/strong>\uff0c\u539f\u578b\u4e0a\u7684\u65b9\u6cd5\u53ef\u4f9b\u6240\u6709\u7ee7\u627f\u5b83\u6216\u95f4\u63a5\u7ee7\u627f\u5b83\u7684\u5b9e\u4f8b\u4f7f\u7528<\/li>\n<li>\u6784\u9020\u5668\u4e5f\u662f\u51fd\u6570\uff0c\u4e5f\u662f\u88abFunction\u5b9e\u4f8b\u5316\u51fa\u6765\u7684\uff0c\u6240\u4ee5\u6784\u9020\u5668\u7684<code>__proto__<\/code>\u5c31\u662fFunction\uff0c\u4f46\u662f\u6784\u9020\u5668\u7684prototype\u5c5e\u6027\u6307\u5411\u7684\u539f\u578b\uff0c\u662f\u6b64\u6784\u9020\u5668\u5b9e\u4f8b\u5316\u51fa\u6765\u7684\u5b9e\u4f8b\u6240\u6307\u5411\u7684\u539f\u578b\uff1b\u7b80\u5355\u8bf4\u6784\u9020\u5668\u7684prototype\u5c31\u662f\u4f5c\u4e3a\u5b83\u7684\u5b9e\u4f8b\u7684\u539f\u578b<\/li>\n<\/ul>\n<p>\u770b\u770b\u51fd\u6570\u7684\u539f\u578b\u94fe<\/p>\n<p><\/p><figure><img decoding=\"async\" alt=\"\u51fd\u6570\u539f\u578b\u94fe\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d5061a3d5f66?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"1280\" data-height=\"578\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;1280&quot; height=&quot;578&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<ul>\n<li>\u5728js\u4e2d\u51fd\u6570\u6709\u591a\u91cd\u8eab\u4efd\uff0c\u51fd\u6570\u53ef\u4ee5\u4f5c\u4e3a\u7c7b\u5c31\u662f\u6784\u9020\u5668\u4f7f\u7528\uff0c\u5b9a\u4e49\u9759\u6001\u65b9\u6cd5\uff0c\u4f5c\u4e3a\u666e\u901a\u51fd\u6570\u8c03\u7528\uff0c<\/li>\n<li>\u53ea\u6709\u7531\u539f\u59cb\u51fd\u6570\u6784\u9020\u5668(Function)\u5b9e\u4f8b\u5316\u7684\u51fd\u6570\u624d\u62e5\u6709\u76f4\u63a5\u4f7f\u7528\u51fd\u6570\u539f\u578b(Function.prototype)\u4e0a\u9762\u7684\u5185\u7f6e\u65b9\u6cd5\uff0c\u521b\u5efa\u51fd\u6570\u53ea\u80fd\u901a\u8fc7\u539f\u59cb\u51fd\u6570\u6784\u9020\u5668\u751f\u6210\uff0c<\/li>\n<li>\u666e\u901a\u51fd\u6570\u4f5c\u4e3a\u6784\u9020\u5668\u4f7f\u7528(new)\u65f6\u76f8\u5f53\u4e8e\u7c7b(class)\u4f7f\u7528\uff0c\u7c7b\u7684prototype\u5c31\u662f\u5b9e\u4f8b\u7684\u539f\u578b\uff0c\u6211\u4eec\u53ef\u4ee5\u7ed9\u539f\u578b\u6dfb\u52a0\u5c5e\u6027\uff0c\u7ed9\u7c7b\u6dfb\u52a0\u5c5e\u6027\u65f6\u5c31\u76f8\u5f53\u4e8e\u7ed9\u6784\u9020\u5668\u6dfb\u52a0\u9759\u6001\u5c5e\u6027<\/li>\n<li>\u666e\u901a\u51fd\u6570\u5728\u521b\u5efa\u5b9e\u4f8b\u7684\u65f6\u5019\uff0c\u4f1a\u751f\u6210\u4e00\u4e2a\u5b9e\u4f8b\u7684\u539f\u578b\uff0c\u6b64\u539f\u578b\u6307\u5411Object.prototype\u5373\u539f\u59cb\u5bf9\u8c61\u539f\u578b\uff0c\u4e5f\u5c31\u662f\u7ee7\u627f\u5bf9\u8c61\u539f\u578b\uff0c\u8fd9\u4e48\u4e00\u6765\u5b9e\u4f8b\u4e5f\u7ee7\u627f\u4e86\u5bf9\u8c61\u7684\u539f\u578b\uff0c\u5219\u5b9e\u4f8b\u4e5f\u5c5e\u4e8e\u5bf9\u8c61\u7c7b\u578b<\/li>\n<\/ul>\n<h2 class=\"heading\" data-id=\"heading-18\"><span id=\"4\">\u56db\u3001\u7ee7\u627f\u4e0e\u5b9e\u73b0<\/span><\/h2>\n<h3 class=\"heading\" data-id=\"heading-19\">\u7ee7\u627f<\/h3>\n<ul>\n<li>\u6240\u8c13\u7ee7\u627f\u4e00\u822c\u8bf4\u7684\u662f\u539f\u578b\u7ee7\u627f\uff0c\u4e00\u4e2a\u539f\u578b\u4e0a\u9762\u5b9a\u4e49\u7684\u65b9\u6cd5\u4e00\u822c\u90fd\u662f\u57fa\u4e8e\u5176\u5b9e\u4f8b\u7684\u7528\u9014\u6765\u5b9a\u4e49\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u539f\u578b\u7684\u65b9\u6cd5\u5e94\u8be5\u662f\u5b9e\u4f8b\u7ecf\u5e38\u7528\u5230\u7684\u901a\u7528\u65b9\u6cd5\uff0c\u800c\u6784\u9020\u5668\u65b9\u6cd5\u4e00\u822c\u662f\u7279\u5b9a\u60c5\u51b5\u4e0b\u53ef\u80fd\u4f1a\u7528\u5230\u7684\u65b9\u6cd5\uff0c\u53ef\u6309\u9700\u8c03\u7528\uff0c\u539f\u578b\u65b9\u6cd5\u53ea\u80fd\u4f9b\u5176\u5b9e\u4f8b\u6765\u4f7f\u7528<\/li>\n<li>\u7ee7\u627f\u53ef\u4ee5\u8ba9\u539f\u578b\u94fe\u4e30\u5bcc\uff0c\u6839\u636e\u9700\u6c42\u5b9a\u5236\u4e0d\u540c\u7684\u539f\u578b\u94fe\uff0c\u4e0d\u4f1a\u5b58\u5728\u5185\u5b58\u6d6a\u8d39\u7684\u60c5\u51b5\uff0c\u539f\u578b\u53ea\u4f1a\u4fdd\u7559\u4e00\u4efd\uff0c\u7528\u5230\u7684\u65f6\u5019\u8c03\u7528\u5c31\u884c\uff0c\u8fd8\u80fd\u8282\u7701\u7a7a\u95f4<\/li>\n<\/ul>\n<p><\/p><figure><img decoding=\"async\" alt=\"\u539f\u578b\u7ee7\u627f\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d50d1a53785a?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"962\" data-height=\"807\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;962&quot; height=&quot;807&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<ul>\n<li>\u53ef\u4ee5\u770b\u51fa\u539f\u578b\u4e00\u822c\u662f\u4e00\u4e9b\u5171\u6709\u7684\u7279\u6027\uff0c\u5b9e\u4f8b\u662f\u7279\u6709\u7684\u7279\u6027\uff0c\u7ee7\u627f\u7684\u8d8a\u591a\u8d8a\u5177\u4f53\uff0c\u539f\u578b\u94fe\u7684\u6700\u9876\u7aef\u662f\u6700\u62bd\u8c61\u7684\uff0c\u8d8a\u5e95\u7aef\u8d8a\u5177\u4f53\uff0c\u8fd9\u6837\u4e00\u6765\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u9700\u6c42\u5728\u6070\u5f53\u4f4d\u7f6e\u7ee7\u627f\u6765\u5b9e\u73b0\u4e2a\u6027\u5316\u7684\u5b9a\u5236\u5c5e\u6027\uff0c\u7edf\u4e00\u800c\u53c8\u6709\u591a\u6837\u5316<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-20\">\u7ee7\u627f\u7684\u5b9e\u73b0<\/h3>\n<ul>\n<li>\u901a\u8fc7es6\u7684extends\u5173\u952e\u5b57\u6765\u7ee7\u627f\u539f\u578b<\/li>\n<li>\u624b\u52a8\u5b9e\u73b0\u539f\u578b\u7ee7\u627f<\/li>\n<\/ul>\n<pre><code class=\"hljs \u7ee7\u627f copyable\" lang=\"\u7ee7\u627f\">\/\/\u8c8c\u4f3c\u8fd9\u4e2a\u65b9\u6cd5\u5c31\u80fd\u5b9e\u73b0\u539f\u578b\u7ee7\u627f\uff0c\u4e0d\u8fc7\u7531\u4e8e\u4f7f\u7528__proto__\u8bbf\u95ee\u5668\u662f\u4e0d\u63a8\u8350\u7684\nfunction foo(v) {\n  this.v = v\n}\nfunction boo(v) {\n  this.vv = v\n}\nboo.prototype.__proto__ = foo.prototype\nconst b = new boo(3)\n------------------------------------------------\n\/\/\u91c7\u7528\u8fd9\u79cd\u65b9\u5f0f\u53ef\u4ee5\u5b9e\u73b0\u539f\u578b\u7684\u7ee7\u627f\uff0c\u4e5f\u662f\u76f4\u63a5\u4fee\u6539\u539f\u578b\nfunction foo(v) {\n  this.v = v\n}\nfunction boo(v) {\n  this.vv = v\n}\nboo.prototype = Object.create(foo.prototype, {\n  constructor: {\n    value: boo,\n    enumerable: false,\n    writable: true,\n    configurable: true\n  }\n})\nconst b = new boo(3)\n-----------------------------------------------\n\/\/\u501f\u52a9\u4e00\u4e2a\u7a7a\u6784\u9020\u5668\u6765\u5b9e\u73b0\u539f\u578b\u7ee7\u627f\nfunction foo(v) {\n  this.v = v\n}\nfunction boo(v) {\n  this.vv = v\n}\nfunction o() {}\no.prototype = foo.prototype\nboo.prototype = new o()\nboo.prototype.constructor = boo\nconst b = new boo(3)\n------------------------------------------------\n\/\/class\u7684extends\u4f1a\u5c06\u5b50\u7c7b\u7684__proto__\u8bbe\u7f6e\u4e3a\u7236\u7c7b\n\u5982\u679c\u5b9e\u73b0\u7c7b\u4f3cextends\u7684\u7ee7\u627f\u8fd8\u9700\u52a0\u4e0a\nboo.__proto__ = foo\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p>\u5b9e\u73b0\u6784\u9020\u5668\u539f\u578b\u7684\u7ee7\u627f\uff0c\u65e0\u975e\u5c31\u662f\u7236\u6784\u9020\u5668\u539f\u578b\u8d4b\u503c\u7ed9\u5b50\u6784\u9020\u5668\u539f\u578b\u7684\u539f\u578b\uff0c\u8fd8\u6709\u9700\u8981\u4fdd\u8bc1\u5b50\u6784\u9020\u5668\u539f\u578b\u4e0d\u80fd\u542b\u6709\u7236\u6784\u9020\u5668\u7684\u5c5e\u6027<\/p>\n<h2 class=\"heading\" data-id=\"heading-21\"><span id=\"5\">\u4e94\u3001\u5b9e\u73b0class\u4e0eextends<\/span><\/h2>\n<h3 class=\"heading\" data-id=\"heading-22\">\u5b9e\u73b0class<\/h3>\n<ul>\n<li>es6\u52a0\u5165\u7684class\u5176\u5b9e\u662f\u4e3a\u4e86\u5f00\u53d1\u8005\u65b9\u4fbf\u521b\u5efa\u7c7b\uff0c\u4e0e\u5176\u4ed6\u8bed\u8a00\u5728\u5199\u6cd5\u4e0a\u5c3d\u91cf\u4e00\u81f4\uff0c\u4f46\u662fjs\u539f\u751f\u5e76\u6ca1\u6709\u7c7b\u8fd9\u4e2a\u4e1c\u897f\uff0c\u4e3a\u4e86\u5b9e\u73b0\u7c7b\u7684\u6548\u679c\uff0c\u53ef\u4ee5\u901a\u8fc7js\u7684\u6784\u9020\u5668\u6765\u5b9e\u73b0\uff0cclass\u4f7f\u7528new\u5173\u952e\u5b57\u751f\u6210\u5b9e\u4f8b\uff0c\u6784\u9020\u5668\u4e5f\u662f\u901a\u8fc7new\u6765\u5b9e\u4f8b\u5316\uff0c\u90a3\u4e48\u53ef\u4ee5\u63a8\u65adclass\u672c\u8d28\u4e5f\u662f\u4e2a\u6784\u9020\u5668<\/li>\n<li>\u624b\u52a8\u5b9e\u73b0class<\/li>\n<\/ul>\n<pre><code class=\"hljs \u5b9e\u73b0class copyable\" lang=\"\u5b9e\u73b0class\">const Class = (function () {\n  function Constructor(name) {\n    this.name = name\n  }\n  \/\/\u6dfb\u52a0\u539f\u578b\u65b9\u6cd5\n  Constructor.prototype.getName = function name(name) {\n    console.log('\u539f\u578b\u65b9\u6cd5getName:' + this.name);\n  }\n  \/\/\u6dfb\u52a0\u539f\u578b\u5c5e\u6027\n  Constructor.prototype.age = '\u539f\u578b\u5c5e\u6027age'\n  \/\/\u6dfb\u52a0\u9759\u6001\u65b9\u6cd5\n  Constructor.log = function log() {\n    console.log('\u6211\u662f\u6784\u9020\u5668\u7684\u9759\u6001\u65b9\u6cd5log');\n  }\n  \/\/\u6dfb\u52a0\u9759\u6001\u5c5e\u6027\n  Constructor.isWho = '\u6784\u9020\u5668\u9759\u6001\u5c5e\u6027isWho'\n  return Constructor\n})()\nconst i = new Class('\u6211\u662f\u5b9e\u4f8b')\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p>\u5b9e\u73b0class\u8bed\u6cd5\u7cd6\uff0c\u53ea\u9700\u5c01\u88c5\u4e00\u5c42\u51fd\u6570\u3002<\/p>\n<ul>\n<li>\u8fd4\u56de\u7684Constructor\u5c31\u662f\u5b9e\u4f8b\u7684\u6784\u9020\u5668\uff0c\u5176prototype\u662f\u4e2a\u7a7a\u767d\u7684\u5bf9\u8c61\u8fd9\u662f\u7531\u4e8eFunction\u9020\u6210\u7684<\/li>\n<li>new\u540e\u9762\u8c03\u7528\u7684\u51fd\u6570\u5fc5\u987b\u662f\u4e00\u4e2a\u6784\u9020\u5668\u51fd\u6570\uff0c\u7528\u4e8e\u6784\u9020\u5b9e\u4f8b\uff0c\u6b64\u6784\u9020\u5668\u7684this\u6307\u5411\u5b9e\u4f8b<\/li>\n<li>\u6784\u9020\u5668\u5185\u90e8\u9700\u8981\u5b9e\u73b0\u4f9d\u7167\u4f20\u5165\u7684\u53c2\u6570\u8bbe\u7f6e\u5b9e\u4f8b\u7684\u5c5e\u6027<\/li>\n<li>\u5b9a\u4e49Class\u65f6\u9700\u8981\u5b9e\u73b0\u539f\u578b\u5c5e\u6027\u548c\u9759\u6001\u5c5e\u6027\u7684\u6302\u8f7d<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u53ea\u5b9e\u73b0class\u7684\u5b9a\u4e49\uff0c\u63a5\u4e0b\u6765\u8981\u5b9e\u73b0\u80fd\u591f\u517c\u5bb9\u7ee7\u627f\u7684\u5199\u6cd5<\/p>\n<h3 class=\"heading\" data-id=\"heading-23\">\u5b9e\u73b0extends<\/h3>\n<ul>\n<li>\u7ee7\u627f\u9700\u8981\u6ee1\u8db3\u539f\u578b\u7684\u7ee7\u627f<\/li>\n<li>\u8fd8\u9700\u8981\u6ee1\u8db3\u53ef\u8c03\u7528\u7236\u7c7b\u6784\u9020\u5668<\/li>\n<\/ul>\n<pre><code class=\"hljs class\u7ee7\u627f\u5b9e\u73b0 copyable\" lang=\"class\u7ee7\u627f\u5b9e\u73b0\">\/\/\u7236\u7c7b\nconst Parent = (function () {\n  function Constructor(age) {\n    this.age = age\n  }\n  Constructor.prototype.getName = function () {\n    console.log(this.name);\n  }\n  return Constructor\n})()\n\/\/\u5b50\u7c7b\nconst Class = (function (_Parent = null) {\n  if (_Parent) {\n    Constructor.prototype = Object.create(_Parent.prototype, {\n      constructor: {\n        value: Constructor,\n        enumerable: false,\n        writable: true,\n        configurable: true\n      }\n    })\n    Constructor.__proto__ = _Parent\n  }\n  function Constructor(name, age) {\n    _Parent ? _Parent.call(this, age) : this\n    this.name = name\n  }\n  Constructor.prototype.getAge = function () {\n    console.log(this.age);\n  }\n  return Constructor\n})(Parent)\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li>\u5b9e\u73b0\u539f\u578b\u7ee7\u627f\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e4b\u524d\u7684\u7ee7\u627f\u5199\u6cd5\uff0c\u6ce8\u610fclass\u5f62\u5f0f\u7684\u7ee7\u627f\uff0c\u4f1a\u628a\u7236\u7c7b\u8bbe\u4e3a\u5b50\u7c7b\u7684<code>__proto__<\/code><\/li>\n<li>\u5728\u6784\u9020\u51fd\u6570\u5185\u5224\u65ad\u662f\u5426\u6709\u7236\u7c7b\uff0c\u5982\u679c\u6709\u5c31\u8981\u8c03\u7528\u7236\u7c7b\u7684\u6784\u9020\u51fd\u6570\uff0c\u628a\u5f53\u524d\u7684this\u4f20\u5165\uff0c\u8fd9\u6837\u624d\u80fd\u751f\u6210\u7236\u7c7b\u6784\u9020\u5668\u4e2d\u5b9a\u4e49\u7684\u5c5e\u6027\uff0c\u8fd9\u624d\u7b97\u662f\u771f\u6b63\u7684\u7ee7\u627f\u3002\u7ee7\u627f\u4e0d\u5355\u7ee7\u627f\u539f\u578b\u8fd8\u80fd\u5b9e\u73b0\u7ee7\u627f\u7236\u7c7b\u6784\u9020\u5668\u4e2d\u5b9a\u4e49\u7684\u5c5e\u6027<\/li>\n<li>\u5bf9\u4e8e\u539f\u578b\u65b9\u6cd5\u548c\u9759\u6001\u65b9\u6cd5\u4e5f\u662f\u7c7b\u4f3c\u5b9a\u4e49\uff0c\u6ce8\u610f\u5b9a\u4e49\u7684\u65b9\u6cd5\u5982\u679c\u7528\u5230this\u9700\u8981\u4f7f\u7528function\u5173\u952e\u5b57\u5b9a\u4e49\u51fd\u6570\uff0c\u4e0d\u53ef\u4f7f\u7528\u533f\u540d\u51fd\u6570\uff0c\u5426\u5219this\u65e0\u6cd5\u6307\u5411\u8c03\u7528\u5bf9\u8c61\u672c\u8eab<\/li>\n<\/ul>\n<h2 class=\"heading\" data-id=\"heading-24\"><span id=\"6\">\u516d\u3001\u4f5c\u7528\u57df\u3001\u6267\u884c\u4e0a\u4e0b\u6587\u4e0e\u95ed\u5305<\/span><\/h2>\n<h3 class=\"heading\" data-id=\"heading-25\">\u4f5c\u7528\u57df\u4e0e\u4f5c\u7528\u57df\u94fe<\/h3>\n<h4 class=\"heading\" data-id=\"heading-26\">\u4f5c\u7528\u57df<\/h4>\n<ul>\n<li>\u6240\u6709\u672a\u5b9a\u4e49\u7684\u53d8\u91cf\u76f4\u63a5\u8d4b\u503c\u4f1a\u81ea\u52a8\u58f0\u660e\u4e3a\u5168\u5c40\u4f5c\u7528\u57df\u7684\u53d8\u91cf(\u9690\u5f0f\u5168\u5c40\u53d8\u91cf\u53ef\u4ee5\u7528delete\u5220\u9664\uff0cvar\u5b9a\u4e49\u7684\u5219\u4e0d\u884c)<\/li>\n<\/ul>\n<pre><code class=\"hljs \u9690\u5f0f\u5168\u5c40\u53d8\u91cf copyable\" lang=\"\u9690\u5f0f\u5168\u5c40\u53d8\u91cf\">a=1 \/\/ \u9690\u5f0f\u5168\u5c40\u53d8\u91cf \u4e25\u683c\u6a21\u5f0f\u62a5\u9519\nvar b=2 \/\/ \u663e\u5f0f\u5168\u5c40\u53d8\u91cf\nconsole.log(a,b) \/\/1 2\ndelete a  \/\/ \u4e25\u683c\u6a21\u5f0f\u62a5\u9519\ndelete b  \/\/ \u4e25\u683c\u6a21\u5f0f\u62a5\u9519\nconsole.log(b,a) \/\/ 2   a is not defined \n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li>window\u5bf9\u8c61\u7684\u6240\u6709\u5c5e\u6027\u62e5\u6709\u5168\u5c40\u4f5c\u7528\u57df<\/li>\n<li>\u5185\u5c42\u4f5c\u7528\u57df\u53ef\u4ee5\u8bbf\u95ee\u5916\u5c42\u4f5c\u7528\u57df\uff0c\u53cd\u4e4b\u4e0d\u884c<\/li>\n<li>var\u58f0\u660e\u7684\u53d8\u91cf\uff0c\u5728\u9664\u4e86\u51fd\u6570\u4f5c\u7528\u57df\u4e4b\u5916\uff0c\u5728\u5176\u4ed6\u5757\u8bed\u53e5\u4e2d\u4e0d\u4f1a\u521b\u5efa\u72ec\u7acb\u4f5c\u7528\u57df<\/li>\n<li>let\u548cconst\u58f0\u660e\u7684\u53d8\u91cf\u5b58\u5728\u5757\u8bed\u53e5\u4f5c\u7528\u57df\uff0c\u4e14\u4e0d\u4f1a\u53d8\u91cf\u63d0\u5347<\/li>\n<li>\u540c\u4f5c\u7528\u57df\u4e0b\u4e0d\u80fd\u91cd\u590d\u4f7f\u7528let\u3001const\u58f0\u660e\u540c\u540d\u53d8\u91cf\uff0cvar\u53ef\u4ee5\uff0c\u540e\u8005\u8986\u76d6\u524d\u8005<\/li>\n<li>for\u5faa\u73af\u7684\u6761\u4ef6\u8bed\u53e5\u7684\u4f5c\u7528\u57df\u4e0e\u5176\u5faa\u73af\u4f53\u7684\u4f5c\u7528\u57df\u4e0d\u540c\uff0c\u6761\u4ef6\u8bed\u53e5\u5757\u5c5e\u4e8e\u5faa\u73af\u4f53\u7684\u7236\u7ea7\u4f5c\u7528\u57df<\/li>\n<\/ul>\n<pre><code class=\"hljs for\u8bed\u53e5\u4f5c\u7528\u57df copyable\" lang=\"for\u8bed\u53e5\u4f5c\u7528\u57df\">\/\/ \u4ee5\u4e0b\u8bed\u53e5\u4f7f\u7528let\u58f0\u660e\u4e0d\u62a5\u9519\uff0c\u8bf4\u660e\u4e3a\u4e0d\u540c\u4f5c\u7528\u57df\nfor (let i = 0; i &lt; 5; i++) {\n  let i = 5\n}\n--------------------------------------------\n\/\/ \u6b64\u8bed\u53e5\u62a5\u9519\uff0c\u8bf4\u660e\u5faa\u73af\u4f53\u4e3a\u6761\u4ef6\u8bed\u53e5\u5757\u7684\u5b50\u4f5c\u7528\u57df\n\/\/ for\u5faa\u73af\u6267\u884c\u987a\u5e8f\u4e3a\uff1a\u6761\u4ef6\u8bed\u53e5\u57571-&gt;\u6761\u4ef6\u8bed\u53e5\u57572-&gt;\u5faa\u73af\u4f53-&gt;\u6761\u4ef6\u8bed\u53e5\u57573-&gt;\u6761\u4ef6\u8bed\u53e5\u57572 \u4f9d\u6b21\u7c7b\u63a8\nfor (let i = 0; i &lt; 5; i=x) { \/\/ x is not defined\n  let x = 5\n}\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h4 class=\"heading\" data-id=\"heading-27\">\u4f5c\u7528\u57df\u94fe<\/h4>\n<ul>\n<li>\u4f5c\u7528\u57df\u94fe\u4e5f\u5c31\u662f\u6240\u8c13\u7684\u53d8\u91cf\u67e5\u627e\u7684\u8303\u56f4<\/li>\n<li>\u5728\u5f53\u524d\u4f5c\u7528\u57df\u5f15\u7528\u53d8\u91cf\u65f6\uff0c\u5982\u679c\u6ca1\u6709\u6b64\u53d8\u91cf\uff0c\u5219\u4f1a\u4e00\u8def\u5f80\u7236\u7ea7\u4f5c\u7528\u57df\u67e5\u627e\u6b64\u53d8\u91cf\uff0c\u76f4\u5230\u5168\u5c40\u4f5c\u7528\u57df\uff0c\u5982\u679c\u90fd\u6ca1\u6709\uff0c\u5728\u975e\u4e25\u683c\u60c5\u51b5\u4e0b\u4f1a\u81ea\u52a8\u58f0\u660e\uff0c\u6240\u4ee5\u662fundefined\uff0c\u5728\u4e25\u683c\u6761\u4ef6\u4e0b\u5219\u4f1a\u62a5\u9519<\/li>\n<li>\u53d8\u91cf\u7684\u67e5\u627e\u8def\u5f84\u4f9d\u636e\u7684\u662f\u5728\u521b\u5efa\u8fd9\u4e2a\u4f5c\u7528\u57df\u7684\u5730\u65b9\u5411\u4e0a\u67e5\u627e\uff0c\u5e76\u975e\u662f\u5728\u6267\u884c\u65f6\u7684\u4f5c\u7528\u57df\uff0c\u5982\u4e0b b\u53d8\u91cf\u7684\u503c\u4e3a2\u3002\u53ef\u4ee5\u770b\u51fa\u5f53\u6267\u884c\u5230\u9700\u8981b\u53d8\u91cf\u65f6\uff0c\u5f53\u524d\u4f5c\u7528\u57df\u4e0b\u5e76\u6ca1\u6709b\uff0c\u6240\u4ee5\u8981\u5230\u5b9a\u4e49\u8fd9\u4e2ab\u53d8\u91cf\u7684\u9759\u6001\u4f5c\u7528\u57df\u4e2d\u5bfb\u627e\uff0c\u5373\u521b\u5efa\u65f6\u5019\u7684\u4f5c\u7528\u57df\u94fe\u4e0a\u67e5\u627eb\u7684\u503c<\/li>\n<\/ul>\n<pre><code class=\"hljs \u4f5c\u7528\u57df\u94fe copyable\" lang=\"\u4f5c\u7528\u57df\u94fe\">b = 1\nfunction a() {\n  \/\/ \u5b9a\u4e49b\uff0c\u627e\u5230\n  const b = 2\n  function s() {\n    \/\/ \u4f7f\u7528\u5230b\uff0c\u5f53\u524d\u4f5c\u7528\u57df\u5e76\u6ca1\u6709\uff0c\u5411\u4e0a\u627e\n    console.log(b);\n  }\n  return s\n}\nconst s = a()\nvar b = 3\ns() \/\/ 2\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li>\u4f5c\u7528\u57df\u5728\u811a\u672c\u89e3\u6790\u9636\u6bb5\u5c31\u5df2\u7ecf\u89c4\u5b9a\u597d\u4e86\uff0c\u6240\u4ee5\u4e0e\u6267\u884c\u9636\u6bb5\u65e0\u5173\uff0c\u4e14\u65e0\u6cd5\u6539\u53d8<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-28\">\u6267\u884c\u4e0a\u4e0b\u6587<\/h3>\n<ul>\n<li>\u6267\u884c\u4e0a\u4e0b\u6587\u5728\u8fd0\u884c\u65f6\u786e\u5b9a\uff0c\u968f\u65f6\u53ef\u80fd\u6539\u53d8<\/li>\n<li>\u8c03\u7528\u6808\u4e2d\u5b58\u653e\u591a\u4e2a\u6267\u884c\u4e0a\u4e0b\u6587\uff0c\u6309\u7167\u540e\u8fdb\u5148\u51fa\u7684\u89c4\u5219\u8fdb\u884c\u521b\u5efa\u548c\u9500\u6bc1\uff0c\u6700\u5e95\u90e8\u7684\u6267\u884c\u4e0a\u4e0b\u6587\uff0c\u4e5f\u5c31\u662f\u6808\u4f4e\u7684\u6267\u884c\u4e0a\u4e0b\u6587\u4e3a\u5168\u5c40\u4e0a\u4e0b\u6587\uff0c\u6700\u65e9\u88ab\u538b\u5165\u6808\u4e2d\uff0c\u5176\u4e0a\u4e0b\u6587\u4e2d\u7684this\u6307\u5411window\uff0c\u4e25\u683c\u6a21\u5f0f\u4e0b\u4e3aundefined<\/li>\n<li>\u521b\u5efa\u6267\u884c\u4e0a\u4e0b\u6587\u65f6\uff0c\u4f1a\u7ed1\u5b9a\u5f53\u524dthis\uff0c\u786e\u5b9a\u8bcd\u6cd5\u73af\u5883\uff0c\u5b58\u50a8\u5f53\u524d\u73af\u5883\u4e0b\u51fd\u6570\u58f0\u660e\u5185\u5bb9\uff0c\u53d8\u91cflet\u4e0econst\u7ed1\u5b9a\u4f46\u672a\u5173\u8054\u4efb\u4f55\u503c\uff0c\u786e\u8ba4\u53d8\u91cf\u73af\u5883\u65f6\uff0c\u7ed1\u5b9avar\u7684\u521d\u59cb\u503c\u4e3aundefined<\/li>\n<li>\u5728var\u58f0\u660e\u4e4b\u524d\uff0c\u8c03\u7528var\u58f0\u660e\u7684\u53d8\u91cf\u65f6\u503c\u4e3aundefined\uff0c\u56e0\u4e3a\u521b\u5efa\u4e86\u6267\u884c\u4e0a\u4e0b\u6587\uff0cvar\u58f0\u660e\u7684\u53d8\u91cf\u5df2\u7ecf\u7ed1\u5b9a\u521d\u59cbundefined\uff0c\u800c\u5728let\u548cconst\u58f0\u660e\u4e4b\u524d\u8c03\u7528\u5176\u58f0\u660e\u7684\u53d8\u91cf\u65f6\uff0c\u7531\u4e8e\u53ea\u7ed1\u5b9a\u5728\u4e86\u6267\u884c\u4e0a\u4e0b\u6587\u4e2d\uff0c\u4f46\u5e76\u672a\u521d\u59cb\u4efb\u4f55\u503c\uff0c\u6240\u4ee5\u5728\u58f0\u660e\u4e4b\u524d\u8c03\u7528\u5219\u4f1a\u629b\u51fa\u5f15\u7528\u9519\u8bef(\u5373TDZ\u6682\u65f6\u6027\u6b7b\u533a)\uff0c\u8fd9\u4e5f\u5c31\u662f\u51fd\u6570\u58f0\u660e\u4e0evar\u58f0\u660e\u5728\u6267\u884c\u4e0a\u4e0b\u6587\u4e2d\u7684\u63d0\u5347<\/li>\n<\/ul>\n<p>\u8fd9\u91cc\u4e86\u89e3\u4e00\u4e0b\u51fd\u6570\u3001\u53d8\u91cf\u63d0\u5347<\/p>\n<pre><code class=\"hljs \u63d0\u5347 copyable\" lang=\"\u63d0\u5347\">console.dir(foo) \/\/ foo(){}\nfunction foo() {}\nvar foo = 5\n\/*\nconsole.dir(foo) \/\/ undefined\nvar foo = 5\n*\/\n------------------------------\nvar foo = 5\nfunction foo() {}\nconsole.dir(foo) \/\/ 5\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p>\u4ece\u4ee5\u4e0a\u4ee3\u7801\u7ed3\u679c\u53ef\u4ee5\u5f97\u51fa\u7ed3\u8bba\uff1a<\/p>\n<ul>\n<li>\u4e0a\u9762\u4ee3\u7801\u5757\u80fd\u591f\u4f53\u73b0\uff0c\u5728\u89e3\u6790\u9636\u6bb5\u4f1a\u5c06\u51fd\u6570\u4e0e\u53d8\u91cf\u63d0\u5347\uff0c\u4e14\u51fd\u6570\u7684\u4f18\u5148\u7ea7\u6bd4var\u58f0\u660e\u7684\u53d8\u91cf\u9ad8\uff0c\u56e0\u4e3a\u6253\u5370\u7684\u662f\u51fd\u6570\u58f0\u660e\uff0c\u5982\u679cvar\u58f0\u660e\u7684\u4f18\u5148\u7ea7\u9ad8\uff0c\u90a3\u4e48\u5e94\u8be5\u662fundefined<\/li>\n<li>\u4ece\u4e0b\u9762\u7684\u4ee3\u7801\u5757\u4e2d\u53ef\u4ee5\u770b\u51fafoo\u5728\u4ee3\u7801\u6267\u884c\u7684\u65f6\u5019\u88ab\u8d4b\u503c\u4e3a5\uff0c\u800c\u51fd\u6570\u58f0\u660e\u5728\u89e3\u6790\u9636\u6bb5\u5df2\u7ecf\u7ed3\u675f\uff0c\u5728\u6267\u884c\u9636\u6bb5\u6ca1\u6709\u6548\u679c<\/li>\n<li>\u8fd8\u6709\u4e00\u70b9 \u4e2a\u4eba\u8ba4\u4e3a\u5728\u89e3\u6790\u9636\u6bb5\uff0c\u51fd\u6570\u58f0\u660e\u4e0e\u53d8\u91cf\u58f0\u660e\u63d0\u5347\u4e4b\u540e\u5728\u4ee3\u7801\u5757\u4e2d\u7684\u4f4d\u7f6e\u987a\u5e8f\u6ca1\u4ec0\u4e48\u5173\u7cfb<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-29\">\u95ed\u5305<\/h3>\n<ul>\n<li>\u6240\u8c13\u95ed\u5305\u5c31\u662f\u51fd\u6570\u4e0e\u5176\u8bcd\u6cd5\u73af\u5883(\u521b\u5efa\u5f53\u524d\u4f5c\u7528\u65f6\u7684\u4efb\u4f55\u5c40\u90e8\u53d8\u91cf)\u7684\u5f15\u7528\u3002\u95ed\u5305\u53ef\u4ee5\u4f7f\u5185\u90e8\u51fd\u6570\u8bbf\u95ee\u5230\u5916\u90e8\u51fd\u6570\u7684\u4f5c\u7528\u57df\uff0c\u5f53\u51fd\u6570\u88ab\u521b\u5efa\u65f6\u5373\u751f\u6210\u95ed\u5305<\/li>\n<\/ul>\n<pre><code class=\"hljs \u95ed\u5305 copyable\" lang=\"\u95ed\u5305\">function fn1() {\n  var name = 'hi';\n  function fn2() {\n    console.log(name);\n  }\n  return fn2\n}\nfn1()() \/\/ hi\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li>\u5f53\u4f60\u4ece\u51fd\u6570\u5185\u90e8\u8fd4\u56de\u4e00\u4e2a\u5185\u90e8\u51fd\u6570\u65f6\uff0c\u8fd4\u56de\u7684\u51fd\u6570\u5c06\u4f1a\u4fdd\u7559\u5f53\u524d\u95ed\u5305\uff0c\u5373\u5f53\u524d\u8bcd\u6cd5\u73af\u5883<\/li>\n<li>\u95ed\u5305\u53ea\u4f1a\u4fdd\u7559\u73af\u5883\u4e2d\u4efb\u4f55\u53d8\u91cf\u7684\u6700\u540e\u4e00\u4e2a\u503c\uff0c\u8fd9\u662f\u56e0\u4e3a\u95ed\u5305\u6240\u4fdd\u5b58\u7684\u662f\u6574\u4e2a\u53d8\u91cf\u7684\u5bf9\u8c61<\/li>\n<li>\u95ed\u5305\u7684\u4f5c\u7528\u57df\u94fe\u5305\u542b\u7740\u5b83\u81ea\u5df1\u7684\u4f5c\u7528\u57df\uff0c\u4ee5\u53ca\u5305\u542b\u5b83\u7236\u7ea7\u51fd\u6570\u7684\u4f5c\u7528\u57df\u548c\u5168\u5c40\u4f5c\u7528\u57df<\/li>\n<li>\u5f53\u8fd4\u56de\u4e00\u4e2a\u95ed\u5305\u65f6\uff0c\u4fdd\u7559\u6b64\u95ed\u5305\u4e0b\u7684\u6240\u6709\u88ab\u5916\u90e8\u5f15\u7528\u7684\u5bf9\u8c61<\/li>\n<li>\u95ed\u5305\u4e4b\u95f4\u662f\u72ec\u7acb\u7684\uff0c\u5728\u95ed\u5305\u73af\u5883\u4e0b\u53ef\u4ee5\u521b\u5efa\u591a\u4e2a\u4e0d\u540c\u7684\u95ed\u5305\u73af\u5883\u66b4\u9732\u7ed9\u5916\u90e8\uff0c\u4ece\u800c\u5b9e\u73b0\u4e0d\u540c\u7684\u6548\u679c<\/li>\n<\/ul>\n<pre><code class=\"hljs \u4e0d\u540c\u73af\u5883\u7684\u95ed\u5305 copyable\" lang=\"\u4e0d\u540c\u73af\u5883\u7684\u95ed\u5305\">function makeAdder(x) {\n  return function(y) {\n    return x + y;\n  };\n}\nvar add5 = makeAdder(5);\nvar add10 = makeAdder(10);\nconsole.log(add5(2));  \/\/ 7\nconsole.log(add10(2)); \/\/ 12\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li>\u66b4\u9732\u95ed\u5305\u7684\u65b9\u5f0f\u4e0d\u6b62\u8fd4\u56de\u5185\u90e8\u51fd\u6570\u4e00\u79cd\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528\u56de\u8c03\u51fd\u6570\u4ea7\u751f\u95ed\u5305\u73af\u5883\uff0c\u6216\u8005\u628a\u5185\u90e8\u51fd\u6570\u8d4b\u503c\u7ed9\u5176\u4ed6\u5916\u90e8\u5bf9\u8c61\u4f7f\u7528<\/li>\n<li>\u95ed\u5305\u5728\u6ca1\u6709\u88ab\u5916\u90e8\u4f7f\u7528\u7684\u60c5\u51b5\u4e0b\uff0c\u968f\u6267\u884c\u7ed3\u675f\u9500\u6bc1\uff0c\u5982\u4f55\u4ea7\u751f\u95ed\u5305\u5e76\u4e14\u4fdd\u7559\u95ed\u5305\u73af\u5883\u7684\u5173\u952e\u5c31\u5728\u4e8e\u4e0d\u8ba9\u5176\u73af\u5883\u88ab\u5783\u573e\u56de\u6536\u7cfb\u7edf\u81ea\u52a8\u6e05\u9664\uff0c\u90a3\u4e48\u5c31\u8981\u4f7f\u5185\u90e8\u73af\u5883\u4e2d\u7684\u5f15\u7528\u88ab\u5916\u90e8\u4fdd\u7559\uff0c\u8fd9\u6837\u624d\u80fd\u4fdd\u7559\u95ed\u5305<\/li>\n<li>\u95ed\u5305\u867d\u7136\u65b9\u4fbf\u6211\u4eec\u64cd\u4f5c\u548c\u4fdd\u7559\u5185\u90e8\u73af\u5883\uff0c\u4f46\u662f\u95ed\u5305\u5728\u5904\u7406\u901f\u5ea6\u548c\u5185\u5b58\u6d88\u8017\u65b9\u9762\u5bf9\u811a\u672c\u6027\u80fd\u5177\u6709\u8d1f\u9762\u5f71\u54cd\uff0c\u9664\u975e\u5728\u7279\u5b9a\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528<\/li>\n<\/ul>\n<p>\u8fd9\u91cc\u770b\u4e2a\u6709\u8da3\u7684\u4e1c\u897f<\/p>\n<pre><code class=\"hljs \u95ed\u5305 copyable\" lang=\"\u95ed\u5305\">function foo(){\n  let a={name:'me'}\n  let b={who:'isMe'}\n  let wm=new WeakMap()\n  function bar(){\n    console.log(a)  \/\/ a\u88ab\u95ed\u5305\u4fdd\u7559\n    wm.set(b,1) \/\/ \u5f31\u5f15\u7528b\u5bf9\u8c61\n    return wm \/\/wm\u88ab\u95ed\u5305\u4fdd\u7559\n  }\n  return bar\n}\nconst wm=foo()()\nconsole.dir(wm) \/\/ No properties \u5373\u4e3a\u7a7a\n-------------------------------------------\nfunction foo(){\n  let a={name:'me'}\n  let wm=new WeakMap()\n  function bar(){\n    console.log(a)\n    wm.set(a,1)\n    return wm\n  }\n  return bar\n}\nconst wm=foo()()\nconsole.dir(wm) \/\/ \u4fdd\u5b58\u4e86\u5bf9\u8c61a\u4e0e\u5176\u503c1\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li>\u4ece\u4e0a\u5757\u4ee3\u7801\u4e2d\u53ef\u4ee5\u770b\u51fa\uff0cbar\u88abreturn\u5230\u5916\u90e8\u73af\u5883\uff0c\u6240\u4ee5\u5176\u5185\u90e8\u5f62\u6210\u95ed\u5305\uff0cbar\u4e2d\u4f7f\u7528\u5230\u7684\u53d8\u91cf(a,wm)\u90fd\u4f1a\u88ab\u4fdd\u7559\u4e0b\u6765\uff0c\u4f46\u662f\u6700\u540e\u6253\u5370wm\u7684\u65f6\u5019\u4e3a\u7a7a\uff1f\u8fd9\u662f\u56e0\u4e3a\u5916\u90e8\u5e76\u6ca1\u6709\u5f15\u7528\u5230b\u5bf9\u8c61\uff0c\u53ea\u662f\u901a\u8fc7wm\u5f31\u5f15\u7528\u4fdd\u5b58b\u7684\u503c\uff0c\u4ecewm\u4e3a\u7a7a\u53ef\u4ee5\u770b\u51fa\uff0c\u95ed\u5305\u5185\u90e8\u7684b\u88ab\u6e05\u9664\uff0c\u6240\u4ee5wm\u4e5f\u81ea\u52a8\u6e05\u9664b\u7684\u5f31\u5f15\u7528\uff0c\u53ef\u4ee5\u8bba\u8bc1\u4e4b\u524d\u6240\u8bf4\uff0c\u95ed\u5305\u53ea\u4fdd\u7559\u5916\u90e8\u7528\u5230\u7684\u53d8\u91cf<\/li>\n<li>\u4ece\u4e0b\u5757\u4ee3\u7801\u80fd\u76f4\u63a5\u770b\u51faa\u5c31\u662f\u95ed\u5305\u4e2d\u7684a\uff0cbar\u5728\u5916\u90e8\u6267\u884c\u65f6\u9700\u8981\u7528\u5230a\u4e0ewm\u6240\u4ee5\u4fdd\u7559\u4e86\u4e0b\u6765<\/li>\n<li>\u6709\u4eba\u53ef\u80fd\u4f1a\u4e0d\u89e3\uff0c\u4e3a\u4ec0\u4e48\u4e0a\u5757\u4ee3\u7801\u4e2d\u7684b\u4e5f\u88abwm.set(b,1)\u5f15\u7528\uff0c\u4f46\u662f\u6700\u7ec8\u5c31\u6ca1\u6709\u5462\uff0c\u90a3\u662f\u56e0\u4e3aWeakMap\u4e2d\u4fdd\u7559\u7684\u662fb\u7684\u5f31\u5f15\u7528\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3a\uff0cwm\u4e2d\u7684b\u662f\u4f9d\u8d56\u539f\u51fd\u6570\u4e2d\u7684b\u800c\u5b58\u5728\uff0c\u5f53wm\u88abreturn\u65f6\uff0c\u95ed\u5305\u4e2d\u7684b\uff0c\u6ca1\u6709\u88ab\u4efb\u4f55\u5916\u90e8\u6240\u4f9d\u8d56\uff0c\u800c\u662f\u522b\u4eba\u4f9d\u8d56\u5b83\u3002\u53ef\u4ee5\u8fd9\u4e48\u7406\u89e3 b\u7275\u7740\u522b\u4eba\u8d70\uff0c\u56e0\u4e3ab\u6ca1\u6709\u88ab\u5916\u9762\u4eba\u7275\u7740\u8d70\uff0c\u6240\u4ee5b\u8fd9\u4e2a\u94fe\u5b50\u5c31\u88ab\u65ad\u5f00\uff0c\u4e5f\u5f71\u54cd\u5230b\u7275\u7684\u4eba\u4e00\u5757\u4e22\u4e86<\/li>\n<\/ul>\n<h2 class=\"heading\" data-id=\"heading-30\"><span id=\"7\">\u4e03\u3001this<\/span><\/h2>\n<p>\u5148\u770b\u4e00\u5f20\u56fe<\/p>\n<p><\/p><figure><img decoding=\"async\" alt=\"\u51fd\u6570this\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d51548402b0f?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"1074\" data-height=\"772\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;1074&quot; height=&quot;772&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<ul>\n<li>this\u7684\u7ed1\u5b9a\u5728\u521b\u5efa\u6267\u884c\u4e0a\u4e0b\u6587\u65f6\u786e\u5b9a<\/li>\n<li>\u5927\u591a\u6570\u60c5\u51b5\u51fd\u6570\u8c03\u7528\u7684\u65b9\u5f0f\u51b3\u5b9athis\u7684\u503c\uff0cthis\u5728\u6267\u884c\u65f6\u65e0\u6cd5\u8d4b\u503c<\/li>\n<li>this\u7684\u503c\u4e3a\u5f53\u524d\u6267\u884c\u7684\u73af\u5883\u5bf9\u8c61\uff0c\u975e\u4e25\u683c\u4e0b\u603b\u662f\u6307\u5411\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4e25\u683c\u4e0b\u53ef\u4ee5\u662f\u4efb\u610f\u503c<\/li>\n<li>\u5168\u5c40\u73af\u5883\u4e0bthis\u59cb\u7ec8\u6307\u5411window\uff0c\u4e25\u683c\u6a21\u5f0f\u4e0b\u51fd\u6570\u7684\u8c03\u7528\u6ca1\u6709\u660e\u786e\u8c03\u7528\u5bf9\u8c61\u7684\u60c5\u51b5\u4e0b\uff0c\u51fd\u6570\u5185\u90e8this\u6307\u5411undefined\uff0c\u975e\u4e25\u683c\u4e0b\u6307\u5411window<\/li>\n<li>\u7bad\u5934\u51fd\u6570\u7684this\u6c38\u8fdc\u6307\u5411\u521b\u5efa\u5f53\u524d\u8bcd\u6cd5\u73af\u5883\u65f6\u7684this<\/li>\n<li>\u4f5c\u4e3a\u6784\u9020\u51fd\u6570\u65f6\uff0c\u51fd\u6570\u4e2d\u7684this\u6307\u5411\u5b9e\u4f8b\u5bf9\u8c61<\/li>\n<li>this\u7684\u7ed1\u5b9a\u53ea\u53d7\u6700\u9760\u8fd1\u8c03\u7528\u5b83\u7684\u6210\u5458\u7684\u5f15\u7528<\/li>\n<li>\u6267\u884c\u4e0a\u4e0b\u6587\u5728\u88ab\u6267\u884c\u7684\u65f6\u5019\u624d\u4f1a\u521b\u5efa\uff0c\u521b\u5efa\u6267\u884c\u4e0a\u4e0b\u6587\u65f6\u624d\u4f1a\u7ed1\u5b9athis\uff0c\u6240\u4ee5this\u7684\u6307\u5411\u6c38\u8fdc\u662f\u5728\u6267\u884c\u65f6\u786e\u5b9a<\/li>\n<\/ul>\n<pre><code class=\"hljs this copyable\" lang=\"this\">function foo(){\n  console.dir(this) \/\/ window ,\u4e25\u683c\u4e0bundefined\n}\nfoo()\n-----------------------------------------------\nfunction foo(){\n  console.dir(this) \/\/\u975e\u4e25\u683cNumber\u5bf9\u8c61\uff0c\u4e25\u683c\u6a21\u5f0f 5\n}\nfoo.call(5)\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p>\u4e25\u683c\u4e0e\u975e\u4e25\u683c\u6a21\u5f0f\u4e0b\u7684this\u6307\u5411\u662f\u4e0d\u540c\u7684\uff0c\u975e\u4e25\u683c\u603b\u662f\u6307\u5411\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4e25\u683c\u6a21\u5f0f\u53ef\u4ee5\u4e3a\u4efb\u610f\u503c<\/p>\n<p>\u6267\u884c\u524d<\/p>\n<p><\/p><figure><img decoding=\"async\" alt=\"this\u6f14\u793a1\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d51c276f0ae3?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"1004\" data-height=\"251\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;1004&quot; height=&quot;251&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<p>\u6267\u884c\u540e<\/p>\n<p><\/p><figure><img decoding=\"async\" alt=\"this\u6f14\u793a2\" class=\"lazyload inited loaded\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d51da155695f?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"990\" data-height=\"332\" src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d51da155695f?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\"><figcaption><\/figcaption><\/figure><p><\/p>\n<p>\u4ee5\u4e0a2\u56fe\u53ef\u4ee5\u4f7f\u7528chrome\u5f00\u53d1\u5de5\u5177\u6765\u8fdb\u884c\u67e5\u770b\u7a0b\u5e8f\u6267\u884c\u65f6\u7684\u76f8\u5173\u6570\u636e\uff0c\u53ef\u4ee5\u770b\u5230\u4e25\u683c\u6a21\u5f0f\u4e0b\u7b80\u5355\u8c03\u7528\u7684\u51fd\u6570\u5185\u90e8\u7684this\u6307\u5411undefined<\/p>\n<h3 class=\"heading\" data-id=\"heading-31\">\u666e\u901a\u51fd\u6570\u4e2d\u7684this<\/h3>\n<h4 class=\"heading\" data-id=\"heading-32\">\u76f4\u63a5\u8c03\u7528<\/h4>\n<p>\u5728\u6ca1\u6709\u660e\u786e\u8c03\u7528\u8005\u60c5\u51b5\u4e0b\u51fd\u6570\u5185\u90e8this\u6307\u5411window\uff0c\u4e25\u683c\u6a21\u5f0f\u4e0b\u90fd\u4e3aundefined\uff0c\u9664\u975e\u7ed1\u5b9a\u51fd\u6570\u7684this\u6307\u5411\uff0c\u624d\u4f1a\u6539\u53d8this<\/p>\n<pre><code class=\"hljs \u666e\u901a\u8c03\u7528 copyable\" lang=\"\u666e\u901a\u8c03\u7528\">\/\/ \u76f4\u63a5\u8c03\u7528\u51fd\u6570\nfunction foo() {\n  console.dir(this) \/\/window,\u4e25\u683c\u4e0b undefined\n  function boo(){\n    console.dir(this) \/\/window,\u4e25\u683c\u4e0b undefined\n  }\n  boo()\n}\n----------------------------------------------\n\/\/ \u53d6\u51fa\u5bf9\u8c61\u4e2d\u7684\u51fd\u6570\uff0c\u518d\u8fdb\u884c\u8c03\u7528\nconst obj = {\n  foo: function foo() {\n    console.dir(this) \/\/window,\u4e25\u683c\u4e0b undefined\n    function boo() {\n      console.dir(this) \/\/window,\u4e25\u683c\u4e0b undefined\n    }\n    return boo\n  }\n}\nconst foo = obj.foo\nfoo()()\n----------------------------------------------\n\/\/ \u76f4\u63a5\u901a\u8fc7\u5bf9\u8c61\u8c03\u7528\u51fd\u6570\uff0c\u518d\u8c03\u7528\u8fd4\u56de\u7684\u51fd\u6570\uff0c\u53ef\u4ee5\u770b\u51fathis\u7684\u6307\u5411\u968f\u8c03\u7528\u5bf9\u8c61\u6539\u53d8\nconst obj = {\n  foo: function foo() {\n    console.dir(this) \/\/obj,\u4e25\u683c\u4e0b obj\n    function boo() {\n      console.dir(this) \/\/window,\u4e25\u683c\u4e0b undefined\n    }\n    return boo\n  }\n}\nconst foo = obj.foo()\nfoo()\n----------------------------------------------\n\/\/ \u57fa\u4e8e\u56de\u8c03\u51fd\u6570\u4e5f\u662f\u5982\u6b64\nfunction foo(func) {\n  console.dir(this) \/\/ window ,\u4e25\u683c\u4e0b undefined\n  func()\n}\nfoo(function () {\n  console.dir(this) \/\/ window ,\u4e25\u683c\u4e0b undefined\n})\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h4 class=\"heading\" data-id=\"heading-33\">\u57fa\u4e8e\u8c03\u7528\u8005\u4ee5\u53ca\u4e0d\u540c\u8c03\u7528\u65b9\u5f0f<\/h4>\n<p>\u51fd\u6570\u8c03\u7528\u4e5f\u5c31\u662f\u5728\u51fd\u6570\u540d\u540e\u9762\u52a0\u4e2a()\uff0c\u8868\u793a\u8c03\u7528\uff0c\u5982\u679c\u51fd\u6570\u540d\u524d\u6ca1\u6709\u52a0\u4efb\u4f55\u4e1c\u897f\uff0c\u90a3\u4e48\u9ed8\u8ba4\u4e3a<strong>\u7b80\u5355\u8c03\u7528<\/strong>\uff0c\u5728\u4e25\u683c\u4e0e\u975e\u4e25\u683c\u73af\u5883\u4e0b\uff0c\u7b80\u5355\u8c03\u7528\u7684\u51fd\u6570\u5185\u90e8this\u6307\u5411undefined\u4e0ewindow\uff0c\u4f46\u662f\u5168\u5c40\u73af\u5883\u4e0b\u7684this\u6c38\u8fdc\u4e3awindow<\/p>\n<p>\u57fa\u4e8e\u5bf9\u8c61<\/p>\n<p>\u5f53\u51fd\u6570\u4f5c\u4e3a<strong>\u5bf9\u8c61\u7684\u65b9\u6cd5<\/strong>\u8c03\u7528\u65f6\uff0c\u4e0d\u53d7\u51fd\u6570\u5b9a\u4e49\u65b9\u5f0f\u6216\u8005\u4f4d\u7f6e\u5f71\u54cd<\/p>\n<pre><code class=\"hljs \u57fa\u4e8e\u5bf9\u8c61 copyable\" lang=\"\u57fa\u4e8e\u5bf9\u8c61\">\/\/ \u51fd\u6570this\u6307\u5411\u8c03\u7528\u8005\u5bf9\u8c61\nconst obj = {\n  foo: function () {\n    console.dir(this) \/\/ obj1,\u4e25\u683c\u4e0b obj1\n    function boo() {\n      console.dir(this) \/\/ window,\u4e25\u683c\u4e0b undefined\n    }\n    boo()\n    return boo\n  }\n}\nconst obj1 = {}\nobj1.boo = obj.foo\nobj1.boo()\n----------------------------------------------\n\/\/ \u4e0d\u540c\u8c03\u7528\u5bf9\u8c61\u65f6\uff0cthis\u6307\u5411\u8c03\u7528\u8005\nconst obj = {\n  foo: function () {\n    console.dir(this) \/\/ obj,\u4e25\u683c\u4e0b obj\n    function boo() {\n      console.dir(this)\n    }\n    boo() \/\/ window,\u4e25\u683c\u4e0b undefined\n    return boo\n  }\n}\nconst obj1 = {}\nobj1.boo = obj.foo()\nobj1.boo() \/\/ obj1,\u4e25\u683c\u4e0b obj1\n----------------------------------------------\n\/\/ this\u6307\u5411\u6700\u8fd1\u7684\u8c03\u7528\u8005\nconst obj = {\n  name: 'obj',\n  obj1: {\n    name: 'obj1',\n    foo: function () {\n      console.dir(this.name) \/\/ obj1\n    }\n  }\n}\nobj.obj1.foo()\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p>\u57fa\u4e8enew\u5173\u952e\u5b57<\/p>\n<pre><code class=\"hljs new copyable\" lang=\"new\">\/\/ \u57fa\u4e8enew\u5173\u952e\u5b57\u8c03\u7528\u7684\u51fd\u6570\u5185\u90e8this\u6307\u5411\u5b9e\u4f8b\nfunction foo() {\n  console.dir(this) \/\/ foo\u5b9e\u4f8b\n  console.log(this instanceof foo) \/\/true\n  console.log(foo.prototype.isPrototypeOf(this)) \/\/true\n  that = this\n}\nvar that\nconst f = new foo()\nconsole.log(that === f) \/\/ true\n----------------------------------------------\n\/\/ \u5d4c\u5957\u51fd\u6570\u5185\u90e8this\u4e0e\u8c03\u7528\u51fd\u6570\u6240\u5728\u73af\u5883\u7684this\u65e0\u5173\nfunction foo() {\n  console.dir(this) \/\/ foo\u5b9e\u4f8b\n  function boo() {\n    console.dir(this) \/\/window,\u4e25\u683c\u4e0bundefined\n  }\n  boo()\n}\nconst f = new foo()\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p>\u57fa\u4e8e\u5b9a\u65f6\u5668\u4e0e\u5fae\u4efb\u52a1<\/p>\n<p>\u5fae\u4efb\u52a1\u4e2d\u7684\u7b80\u5355\u8c03\u7528\u7684\u51fd\u6570this\u6307\u5411window\u4e25\u683c\u4e0b\u6307\u5411undefined\uff0c\u800c<strong>\u5b9a\u65f6\u5668\u4e2d\u7684\u56de\u8c03\u51fd\u6570\u4e0d\u7ba1\u5728\u4e25\u683c\u8fd8\u662f\u975e\u4e25\u683c\u73af\u5883\u4e0bthis\u6c38\u8fdc\u6307\u5411window<\/strong>\uff0c\u8bf4\u660e\u4e00\u70b9\uff0c\u8c03\u7528window\u5bf9\u8c61\u7684\u65b9\u6cd5\u65f6this\u6307\u5411window\u4e5f\u5c31\u662f\u5168\u5c40\u5bf9\u8c61\uff0c\u6362\u53e5\u8bdd\u8bf4\uff0c\u7b80\u5355\u8c03\u7528\u7684\u51fd\u6570\u5982\u679c\u5c5e\u4e8ewindow\u672c\u8eab\u81ea\u5e26\u7684\u65b9\u6cd5\u90a3\u4e48\u8fd9\u4e2a\u65b9\u6cd5\u7684this\u6307\u5411window<\/p>\n<pre><code class=\"hljs \u5b8f\u5fae\u4efb\u52a1 copyable\" lang=\"\u5b8f\u5fae\u4efb\u52a1\">\/\/ \u5f02\u6b65\u4efb\u52a1\u4e2d\u7b80\u5355\u8c03\u7528\u7684\u51fd\u6570\u90fd\u662f\u8fdb\u5165\u961f\u5217\uff0c\u6700\u540e\u7531\u5168\u5c40\u73af\u5883\u8c03\u7528\nconst id = setInterval(function () {\n  console.dir(this) \/\/ window ,\u4e25\u683c\u4e0b window\n  setTimeout(() =&gt; {\n    console.dir(this) \/\/ window ,\u4e25\u683c\u4e0b window\n    clearInterval(id)\n  });\n})\n----------------------------------------------\nnew Promise(function (resolve, reject) {\n  console.dir(this) \/\/ window ,\u4e25\u683c\u4e0b undefined\n  resolve()\n}).then(function (res) {\n  console.dir(this) \/\/ window ,\u4e25\u683c\u4e0b undefined\n});\n----------------------------------------------\n(async function foo() {\n  function boo() {\n    console.dir(this) \/\/ window ,\u4e25\u683c\u4e0b undefined\n  }\n  await boo()\n  console.dir(this) \/\/ window ,\u4e25\u683c\u4e0b undefined\n})()\n----------------------------------------------\n\/\/ \u5b9a\u65f6\u5668\u7684\u56de\u8c03\u6700\u7ec8\u90fd\u4f1a\u88ab\u4f5c\u4e3a\u7b80\u5355\u51fd\u6570\u88ab\u6267\u884c\uff0c\u5b9a\u65f6\u5668\u5c5e\u4e8ewindow\u5bf9\u8c61\u7684\u65b9\u6cd5\nfunction foo(){\n  setTimeout(function (){\n    console.log(this) \/\/window ,\u4e25\u683c\u4e0bwindow\n  })\n}\nfoo.call(5)\n----------------------------------------------\n\/\/ \u51fd\u6570\u5185\u90e8\u7684this\u5c31\u662f\u6307\u5411\u8c03\u7528\u8005\uff0c\u5e76\u4e14\u53ef\u4ee5\u770b\u51fa\u7b80\u5355\u8c03\u7528\u7684\u56de\u8c03\u51fd\u6570\u4e2d\u7684this\u4e5f\u6307\u5411window\nconst obj = {\n  foo(callback) {\n    callback()\n    console.log(this.foo === obj.foo) \/\/ true\n    console.log(this === obj) \/\/ true\n  }\n}\nobj.foo(function () {\n  console.log(this) \/\/window ,\u4e25\u683c\u4e0bundefined\n})\n----------------------------------------------\n\/\/ \u901a\u8fc7arguments\u8c03\u7528\u7684\u56de\u8c03\u51fd\u6570\u4e2d\u7684this\u6307\u5411\u8c03\u7528\u8005\uff0c\u6ce8\u610f\u4e25\u683c\u4e0e\u975e\u4e25\u683c\u4e0b\u7684arguments\u5bf9\u8c61\u6709\u6240\u4e0d\u540c\nconst obj = {\n  foo(callback) {\n    arguments[0]()\n    console.log(this.foo === obj.foo) \/\/ true\n    console.log(this === obj) \/\/ true\n  }\n}\nobj.foo(function () {\n  console.log(this) \/\/arguments\u5bf9\u8c61 \uff0c\u4e25\u683c\u4e0b arguments\u5bf9\u8c61\n})\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h3 class=\"heading\" data-id=\"heading-34\">\u7bad\u5934\u51fd\u6570\u4e2d\u7684this<\/h3>\n<p>es6\u5f15\u5165\u7684\u7bad\u5934\u51fd\u6570\uff0c\u662f\u4e0d\u5177\u6709this\u7ed1\u5b9a\uff0c\u4e0d\u8fc7\u5728\u5176\u51fd\u6570\u4f53\u4e2d\u53ef\u4ee5\u4f7f\u7528this\uff0c\u800c\u8fd9\u4e2athis\u6307\u5411\u7684\u662f\u7bad\u5934\u51fd\u6570\u5f53\u524d\u6240\u5904\u7684\u8bcd\u6cd5\u73af\u5883\u4e2d\u7684this\u5bf9\u8c61\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3a\uff0cthis\u5728\u7bad\u5934\u51fd\u6570\u4e2d\u662f\u900f\u660e\u7684\uff0c\u7bad\u5934\u51fd\u6570\u5305\u4e0d\u4f4fthis\uff0c\u6240\u4ee5\u51fd\u6570\u5185\u90e8\u4e0e\u5916\u90e8\u7684this\u4e3a\u540c\u4e00\u503c<\/p>\n<ul>\n<li>\u5224\u65ad\u7bad\u5934\u51fd\u6570\u7684this\u6307\u5411\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u7bad\u5934\u51fd\u6570\u770b\u6210\u900f\u660e\uff0c\u5176\u4e0a\u4e0b\u6587\u4e2d\u7684this\u5c31\u662f\u5b83\u7684this<\/li>\n<\/ul>\n<pre><code class=\"hljs \u7bad\u5934\u51fd\u6570\u4e2d\u7684this copyable\" lang=\"\u7bad\u5934\u51fd\u6570\u4e2d\u7684this\">\/\/ \u53ef\u4ee5\u770b\u51fa\u7bad\u5934\u51fd\u6570\u4e2d\u7684this\u5c31\u662f\u5176\u6240\u5728\u73af\u5883\u7684this\uff0c\u7bad\u5934\u51fd\u6570\u65e0\u6cd5\u56fa\u5b9athis\uff0c\u7531\u5176\u73af\u5883\u51b3\u5b9a\nconst foo = () =&gt; {\n  console.dir(this) \/\/window ,\u4e25\u683c\u4e0b\u8fd8\u662fwindow\n}\nfoo()\n----------------------------------------------\n\/\/ \u53ef\u89c1\u5bf9\u8c61\u4e2d\u7684this\u6307\u5411window\uff0c\u7bad\u5934\u51fd\u6570\u4e2d\u7684this\u6307\u5411\u5bf9\u8c61\u4e2d\u7684this\u3002\u7531\u4e8e\u53ea\u6709\u521b\u5efa\u6267\u884c\u4e0a\u4e0b\u6587\u624d\u4f1a\u7ed1\u5b9athis\u6307\u5411\uff0c\u800c\u9664\u4e86\u5168\u5c40\u4e0a\u4e0b\u6587\uff0c\u53ea\u6709\u51fd\u6570\u4f5c\u7528\u57df\u624d\u4f1a\u521b\u5efa\u4e0a\u4e0b\u6587\u73af\u5883\u4ece\u800c\u7ed1\u5b9athis\uff0c\u521b\u5efa\u5bf9\u8c61\u4e0d\u4f1a\u7ed1\u5b9athis\uff0c\u6240\u4ee5\u8fd8\u662f\u5168\u5c40this\nconst obj={\n  this:this,\n  foo:()=&gt;{\n    console.dir(this) \/\/window \uff0c\u4e25\u683c\u4e0b window\n  }\n}\nconsole.dir(obj.this) \/\/window \uff0c\u4e25\u683c\u4e0b window\nobj.foo()\n---------------------------------------------\n\/\/ \u5bf9\u8c61\u65b9\u6cd5\u5185\u90e8\u5d4c\u5957\u7bad\u5934\u51fd\u6570\uff0c\u5219\u6b64\u7bad\u5934\u51fd\u6570\u7684this\u5c5e\u4e8e\u5916\u90e8\u975e\u7bad\u5934\u51fd\u6570this\u3002\u5f53\u8c03\u7528obj.foo\u65f6foo\u51fd\u6570\u521b\u5efa\u7684\u6267\u884c\u4e0a\u4e0b\u6587\u4e2d\u7684this\u7ed1\u5b9a\u5bf9\u8c61obj\uff0c\u800c\u7bad\u5934\u51fd\u6570\u5e76\u4e0d\u4f1a\u7ed1\u5b9athis\uff0c\u6240\u4ee5\u5176this\u5c5e\u4e8efoo\u4e0b\u7684this\uff0c\u5373\u5bf9\u8c61obj\nconst obj = {\n  foo: function () {\n    return () =&gt; {\n      console.dir(this) \/\/obj \uff0c\u4e25\u683c\u4e0b obj\n    }\n  }\n}\nobj.foo()()\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h3 class=\"heading\" data-id=\"heading-35\">\u5982\u4f55\u6539\u53d8\u51fd\u6570\u7684this\u6307\u5411<\/h3>\n<p>\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u901a\u8fc7apply\u3001call\u3001bind\u6765\u7ed9\u51fd\u6570\u7ed1\u5b9athis<\/p>\n<ul>\n<li>apply\u65b9\u6cd5\u4e2d\u7b2c\u4e00\u4e2a\u53c2\u6570\u4e3a\u88ab\u8c03\u7528\u7684\u51fd\u6570\u4e2d\u7684this\u6307\u5411\uff0c\u4f20\u5165\u4f60\u60f3\u8981\u7ed1\u5b9a\u7684this\u503c\u5373\u53ef\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u88ab\u8c03\u7528\u51fd\u6570\u7684\u53c2\u6570\u96c6\u5408\uff0c\u901a\u5e38\u662f\u4e2a\u6570\u7ec4<\/li>\n<li>call\u4e0eapply\u65b9\u6cd5\u57fa\u672c\u4e00\u81f4\uff0c\u533a\u522b\u5728\u4e8e\u4f20\u5165\u53c2\u6570\u5f62\u5f0f\u4e0d\u540c\uff0ccall\u4f20\u5165\u7684\u53c2\u6570\u4e3a\u53ef\u53d8\u53c2\u6570\u5217\u8868\uff0c\u53c2\u6570\u6309\u9010\u4e2a\u4f20\u5165<\/li>\n<li>bind\u65b9\u6cd5\u4e0e\u4ee5\u4e0a\u4e0d\u540c\u7684\u662f\u4e0d\u4f1a\u76f4\u63a5\u8c03\u7528\u51fd\u6570\uff0c\u53ea\u662f\u5148\u7ed1\u5b9a\u51fd\u6570\u7684this\uff0c\u5230\u8981\u4f7f\u7528\u7684\u65f6\u5019\u8c03\u7528\u5373\u53ef\uff0c\u6b64\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u7ed1\u5b9athis\u4e0e\u53c2\u6570\u4e4b\u540e\u7684\u65b0\u51fd\u6570\uff0c\u5176\u4f20\u5165\u53c2\u6570\u5f62\u5f0f\u540ccall<\/li>\n<li>\u901a\u8fc7\u53d8\u91cf\u4fdd\u7559\u6307\u5b9athis\u6765\u8fbe\u5230\u56fa\u5b9athis<\/li>\n<\/ul>\n<pre><code class=\"hljs \u6539\u53d8this copyable\" lang=\"\u6539\u53d8this\">\/\/ \u901a\u8fc7\u53d8\u91cf\u4fdd\u7559\u7236\u7ea7this\uff0c\u8fdb\u884c\u5bf9_this\u53d8\u91cf\u4fee\u6539\u4e5f\u5c31\u8fbe\u5230\u4fee\u6539\u539fthis\u7684\u6548\u679c\nconst obj = {\n  name: 'obj',\n  foo: function () {\n    let _this = this\n    function boo() {\n      _this.name = 'OBJ'\n      console.dir(obj.name) \/\/ OBJ\n    }\n    return boo\n  }\n}\nobj.foo()()\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h2 class=\"heading\" data-id=\"heading-36\"><span id=\"8\">\u516b\u3001apply\u3001call\u3001bind\u5b9e\u73b0<\/span><\/h2>\n<p>\u8fd93\u8005\u7684\u5b9e\u73b0\u5176\u5b9e\u5dee\u4e0d\u591a\uff0cbind\u5b9e\u73b0\u53ef\u80fd\u4f1a\u6709\u70b9\u4e0d\u4e00\u6837\uff0c\u90fd\u8981\u5b9e\u73b0this\u7684\u6539\u53d8<\/p>\n<h3 class=\"heading\" data-id=\"heading-37\">\u624b\u52a8\u5b9e\u73b0apply<\/h3>\n<ul>\n<li>\u601d\u8def\u5c31\u662f\u60f3\u529e\u6cd5\u4f7f\u51fd\u6570\u88ab\u4f20\u5165\u7684thisArg\u8c03\u7528\uff0c\u90a3\u4e48\u51fd\u6570\u7684this\u5c31\u6307\u5411\u8c03\u7528\u8005<\/li>\n<\/ul>\n<pre><code class=\"hljs \u624b\u52a8apply copyable\" lang=\"\u624b\u52a8apply\">Function.prototype.Apply = function (thisArg, args = Symbol.for('args')) {\n  console.dir(this)            \/\/this\u4e3a\u8fd9\u4e2a\u65b9\u6cd5\u7684\u8c03\u7528\u8005=&gt;foo\u51fd\u6570\n  const fn = Symbol('fn')      \/\/\u751f\u6210\u4e00\u4e2a\u4e0d\u91cd\u590d\u7684\u952e\n  thisArg[fn] = this || window \/\/\u628afoo\u51fd\u6570\u4f5c\u4e3a\u4f20\u5165this\u7684\u4e00\u4e2a\u65b9\u6cd5\n  args === Symbol.for('args') \n  ? thisArg[fn]()\n  : thisArg[fn](...args)       \/\/\u8c03\u7528\u8fd9\u65b9\u6cd5\uff0c\u4f20\u53c2\n  delete thisArg[fn]           \/\/\u4f7f\u7528\u5b8c\u5220\u9664\n}\nvar name = 'foo'\nvar age = 5\nfunction foo(age,height) {\n  console.log(this.name) \/\/ obj\n  console.log(age)       \/\/ 3\n  console.log(height)    \/\/ null\n}\nconst obj = {\n  name: 'obj',\n  age: 3\n}\nfoo.Apply(obj,[obj.age,null])\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h3 class=\"heading\" data-id=\"heading-38\">\u624b\u52a8\u5b9e\u73b0call<\/h3>\n<p>\u57fa\u672c\u601d\u8def\u540capply\uff0c\u5c31\u662f\u4f20\u53c2\u5f62\u5f0f\u6539\u53d8\u4e00\u4e0b,\u8fd9\u91cc\u901a\u8fc7arguments\u83b7\u53d6\u53c2\u6570\u5217\u8868<\/p>\n<pre><code class=\"hljs call\u5b9e\u73b0 copyable\" lang=\"call\u5b9e\u73b0\">Function.prototype.Call = function (thisArg) {\n  console.dir(this)            \/\/this\u4e3a\u8fd9\u4e2a\u65b9\u6cd5\u7684\u8c03\u7528\u8005=&gt;foo\u51fd\u6570\n  const fn = Symbol('fn')      \/\/\u751f\u6210\u4e00\u4e2a\u4e0d\u91cd\u590d\u7684\u952e\n  thisArg[fn] = this || window \/\/\u628afoo\u51fd\u6570\u4f5c\u4e3a\u4f20\u5165this\u7684\u4e00\u4e2a\u65b9\u6cd5\n  const args = Array.from(arguments).slice(1)\n  args.length ? thisArg[fn](...args) : thisArg[fn]()  \/\/\u8c03\u7528\u8fd9\u65b9\u6cd5\uff0c\u4f20\u53c2\n  delete thisArg[fn]           \/\/\u4f7f\u7528\u5b8c\u5220\u9664\n}\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h3 class=\"heading\" data-id=\"heading-39\">\u624b\u52a8\u5b9e\u73b0bind<\/h3>\n<p>bind\u51fd\u6570\u8981\u80fd\u591f\u8fd4\u56de\u4e25\u683c\u7ed1\u5b9athis\u4e0e\u53c2\u6570\u540e\u7684\u51fd\u6570\uff0c\u8c03\u7528\u8fd9\u4e2a\u8fd4\u56de\u7684\u51fd\u6570\u65f6\u6709\u53ef\u80fd\u8fd8\u4f1a\u4f20\u5165\u53c2\u6570\uff0c\u90a3\u4e48\u9700\u8981\u62fc\u63a5\u53c2\u6570<\/p>\n<pre><code class=\"hljs bind\u5b9e\u73b0 copyable\" lang=\"bind\u5b9e\u73b0\">Function.prototype.Bind = function (thisArg) {\n  const fn = Symbol('fn')       \/\/\u751f\u6210\u4e00\u4e2a\u4e0d\u91cd\u590d\u7684\u952e\n  thisArg[fn] = this || window  \/\/\u628afoo\u51fd\u6570\u4f5c\u4e3a\u4f20\u5165this\u7684\u4e00\u4e2a\u65b9\u6cd5\n  const f = thisArg[fn]         \/\/ \u8d1f\u8d23\u4e00\u4efd\u51fd\u6570\n  delete thisArg[fn]            \/\/\u5220\u9664\u539f\u6765\u5bf9\u8c61\u4e0a\u7684\u51fd\u6570\uff0c\u4f46\u662f\u4fdd\u7559\u4e86this\u6307\u5411\n  const args = Array.from(arguments).slice(1)\n  return function () {\n    const arg = args.concat(...arguments)\n    f(...arg)\n  }\n}\nvar name = 'foo'\nvar age = 5\nvar height = 4\nfunction foo(age, height) {\n  console.log(this.name)       \/\/ obj\n  console.log(age)             \/\/ 3\n  console.log(height)          \/\/ 2\n}\nconst obj = {\n  name: 'obj',\n  age: 3\n}\nfoo.Bind(obj, obj.age)(2)\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h2 class=\"heading\" data-id=\"heading-40\"><span id=\"9\">\u4e5d\u3001\u540c\u6b65\u4e0e\u5f02\u6b65<\/span><\/h2>\n<h3 class=\"heading\" data-id=\"heading-41\">\u540c\u6b65<\/h3>\n<ul>\n<li>\u57fa\u4e8ejs\u7684\u5355\u7ebf\u7a0b\u540c\u65f6\u53ea\u80fd\u5904\u7406\u4e00\u4ef6\u4e8b\u60c5\uff0c\u800c\u540c\u6b65\u5373\u662f\u5728\u4e3b\u7ebf\u7a0b\u4e0a\u6392\u961f\u6267\u884c\u7684\u4efb\u52a1\uff0c\u53ea\u6709\u5f53\u524d\u4efb\u52a1\u6267\u884c\u5b8c\u6210\uff0c\u624d\u4f1a\u8fdb\u5165\u4e0b\u4e00\u4e2a\u4efb\u52a1\u3002\u540c\u6b65\u6267\u884c\u7684\u51fd\u6570\u4f1a\u5728\u9884\u671f\u5f97\u5230\u7ed3\u679c\uff0c\u4e5f\u5c31\u662f\u53ef\u4ee5\u6e05\u695a\u4ec0\u4e48\u65f6\u5019\u80fd\u5f97\u5230\u8fd4\u56de\u503c<\/li>\n<li>\u6240\u6709\u540c\u6b65\u4ee3\u7801\u53ea\u4f1a\u8fdb\u5165\u8c03\u7528\u6808\uff0c\u540c\u6b65\u4ee3\u7801\u4f1a\u963b\u585e\u4e3b\u7ebf\u7a0b\u7684\u6267\u884c\uff0c\u800c\u4e14\u4f1a\u4f18\u5148\u4e0e\u5176\u4ed6\u975e\u540c\u6b65\u4ee3\u7801\u6267\u884c<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-42\">\u5f02\u6b65<\/h3>\n<ul>\n<li>\u5f02\u6b65\u662f\u6307\u5f53\u524d\u6267\u884c\u7684\u4ee3\u7801\u4f1a\u8fdb\u5165\u5f02\u6b65\u7ebf\u7a0b\u5904\u7406\u4e4b\u540e\u624d\u4f1a\u518d\u7531\u4e3b\u7ebf\u7a0b\u5904\u7406\u56de\u8c03<\/li>\n<li>\u5f02\u6b65\u7684\u7ed3\u679c\u4e0d\u662f\u9a6c\u4e0a\u80fd\u591f\u5f97\u5230\uff0c\u800c\u662f\u4f1a\u5728\u5c06\u6765\u7684\u67d0\u4e2a\u65f6\u95f4\u70b9\u83b7\u53d6\u5230<\/li>\n<li>\u901a\u5e38\u5f02\u6b65\u4ee3\u7801\u6240\u8981\u7ecf\u8fc7\u7684\u6b65\u9aa4\u6bd4\u540c\u6b65\u4ee3\u7801\u591a\uff0c\u7531\u4e8e\u5f02\u6b65\u4ee3\u7801\u4e0d\u662f\u76f4\u63a5\u653e\u5728\u8c03\u7528\u6808\u4e2d\u6267\u884c\uff0c\u800c\u662f\u8981\u6d3e\u53d1(\u53ef\u80fd\u4e0d\u9700\u8981)\u7ed9\u5176\u4ed6\u7ebf\u7a0b\u5904\u7406\uff0c\u7b49\u5904\u7406\u5b8c\u6210\u540e\u7684\u56de\u8c03\u653e\u5728\u67d0\u4e2a\u5730\u65b9\u5b58\u50a8(\u6bd4\u5982\u4efb\u52a1\u961f\u5217)\uff0c\u7b49\u5230\u540c\u6b65\u961f\u5217\u6267\u884c\u5b8c\u6210\u4e4b\u540e\u624d\u4f1a\u53d6\u56de\u5f02\u6b65\u56de\u8c03\u4ee3\u7801\u8fdb\u884c\u6267\u884c<\/li>\n<\/ul>\n<h4 class=\"heading\" data-id=\"heading-43\">\u5f02\u6b65\u3001\u5355\u7ebf\u7a0b\u4e0eEventLoop<\/h4>\n<p>\u5148\u770b\u4e00\u5f20\u56fe\uff0c\u6709\u4e2a\u5927\u4f53\u67b6\u6784<\/p>\n<p><\/p><figure><img decoding=\"async\" alt=\"\u4e8b\u4ef6\u5faa\u73af\" class=\"lazyload inited loaded\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d5330a5a1b7f?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"1280\" data-height=\"565\" src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d5330a5a1b7f?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\"><figcaption><\/figcaption><\/figure><p><\/p>\n<ul>\n<li>js\u4e3b\u7ebf\u7a0b\u5904\u7406\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684\u4ee3\u7801\uff0c\u5b83\u4f1a\u6267\u884c\u5f53\u524d\u8c03\u7528\u6808\u6808\u9876\u7684\u6267\u884c\u4e0a\u4e0b\u6587\uff0c\u4ece\u5806\u7a7a\u95f4(\u4e00\u822c\u662f\u5b58\u50a8\u5bf9\u8c61)\u548c\u6808\u7a7a\u95f4(\u4e00\u822c\u5b58\u50a8\u975e\u5bf9\u8c61\u503c\u4ee5\u53ca\u5bf9\u8c61\u5f15\u7528)\u53d6\u6570\u636e\uff0c\u8fdb\u800c\u5904\u7406\u5f53\u524d\u8c03\u7528\u6808\u6240\u7528\u5230\u7684\u6570\u636e<\/li>\n<li>\u6240\u6709\u7684\u540c\u6b65\u4ee3\u7801\u4f1a\u6309\u7167\u4ee3\u7801\u987a\u5e8f\u538b\u5165\u8c03\u7528\u6808\u4e2d\u7b49\u5f85\u4e3b\u7ebf\u7a0b\u6267\u884c\uff0c\u5982\u679c\u4ee3\u7801\u4e2d\u9047\u5230\u4e86\u5f02\u6b65\u4ee3\u7801\uff0c\u5219\u4f1a\u6839\u636e\u5f02\u6b65\u7c7b\u578b\u629b\u7ed9\u5f02\u6b65\u7ebf\u7a0b\u6267\u884c<\/li>\n<li>\u5f02\u6b65\u7c7b\u578b\uff0c\u4e3b\u8981\u5206\u4e3a\u5fae\u4efb\u52a1\u4e0e\u5b8f\u4efb\u52a1<\/li>\n<li>\u4efb\u52a1\u961f\u5217\u5176\u5b9e\u672c\u8d28\u5c31\u662f\u4e00\u5757\u5185\u5b58\u7a7a\u95f4\uff0c\u91cc\u9762\u7684\u4efb\u52a1\u662f\u4f9d\u636eFIFO\u5148\u8fdb\u5148\u51fa\u7684\u89c4\u5219\u6765\u6267\u884c\uff0c\u6240\u6709\u5f02\u6b65\u4ee3\u7801\u6267\u884c\u5b8c\u6bd5\u7684\u56de\u8c03\u90fd\u662f\u52a0\u5165\u5230\u5f02\u6b65\u4efb\u52a1\u961f\u5217\u4e2d\u7b49\u5f85\u4e3b\u7ebf\u7a0b\u7684\u8c03\u7528<\/li>\n<li>\u5f02\u6b65\u53ef\u4ee5\u63d0\u9ad8cpu\u7684\u5229\u7528\u7387<\/li>\n<\/ul>\n<h5 class=\"heading\" data-id=\"heading-44\">\u5fae\u4efb\u52a1<\/h5>\n<ul>\n<li>\u5fae\u4efb\u52a1\u961f\u5217\u4e0e\u5b8f\u4efb\u52a1\u961f\u5217\u7684\u533a\u522b\u5c31\u5728\u4e8e\uff0c\u4e3b\u7ebf\u7a0b\u5bf9\u4e8e\u5176\u4e2d\u7684\u4efb\u52a1\u8c03\u5ea6\u7684\u533a\u522b\uff0c\u4e3b\u8fdb\u7a0b\u4f1a\u4f18\u5148\u6267\u884c\u5fae\u4efb\u52a1\u961f\u5217\u4e2d\u7684\u5168\u90e8\u4efb\u52a1\uff0c\u5f53\u5fae\u4efb\u52a1\u4e2d\u7684\u5168\u90e8\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\u624d\u4f1a\u8fdb\u800c\u8f6c\u5230\u5b8f\u4efb\u52a1\u6267\u884c<\/li>\n<li>\u5fae\u4efb\u52a1\u53ef\u4ee5\u7531\u8fd9\u4e9b\u65b9\u6cd5\u5173\u952e\u5b57\u8c03\u7528\u4ea7\u751fPromise\u3001async\u3001await\u3001MutaionObserver\u3001process.nextTick(Node.js\u73af\u5883\uff09<\/li>\n<li>\u5982\u679c\u8c03\u7528\u5fae\u4efb\u52a1\u65b9\u6cd5\u65f6\uff0c\u65b9\u6cd5\u5185\u90e8\u5305\u542b\u5176\u4ed6\u7ebf\u7a0b\u5e72\u9884\u5904\u7406\u65f6\uff0c\u4f1a\u629b\u7ed9\u6307\u5b9a\u7ebf\u7a0b\u6267\u884c\uff0c\u800c\u4e3b\u7ebf\u7a0b\u7ee7\u7eed\u6267\u884c\u4e0b\u9762\u7684\u4ee3\u7801\uff0c\u7b49\u5230\u5176\u4ed6\u7ebf\u7a0b\u5904\u7406\u5b8c\u6210\u4e4b\u540e\uff0c\u5982\u679c\u6709\u56de\u8c03\u51fd\u6570\u5219\u4f1a\u628a\u56de\u8c03\u52a0\u5165\u5230\u6307\u5b9a\u5f02\u6b65\u7c7b\u578b(\u8fd9\u91cc\u4e3a\u5fae\u4efb\u52a1\u961f\u5217)\u7684\u961f\u5217\u4e2d\u6392\u961f\u7b49\u5f85\u4e3b\u7ebf\u7a0b\u6267\u884c<\/li>\n<li>\u5fae\u4efb\u52a1\u4e0e\u5b8f\u4efb\u52a1\u7684\u4e3b\u8981\u533a\u522b\u5728\u4e8e\uff0c\u4e3b\u7ebf\u7a0b\u4f18\u5148\u6267\u884c\u5168\u90e8\u5fae\u4efb\u52a1\uff0c\u5f85\u6267\u884c\u5b8c\u6210\u4e4b\u540e\u624d\u4f1a\u6328\u4e2a\u6267\u884c\u5b8f\u4efb\u52a1<\/li>\n<\/ul>\n<h5 class=\"heading\" data-id=\"heading-45\">\u5b8f\u4efb\u52a1<\/h5>\n<ul>\n<li>\u4e00\u822c\u7684\u5b8f\u4efb\u52a1\u961f\u5217\u5b58\u653e\u7684\u662fWebApis\u7684\u56de\u8c03\uff0cWebApis\u4e2d\u5305\u542b\u8bb8\u591a\u7ebf\u7a0b\uff0cGUI\u6e32\u67d3\u7ebf\u7a0b(\u4e0ejs\u4e3b\u7ebf\u7a0b\u4e92\u65a5\u4e0d\u80fd\u540c\u65f6\u6267\u884c)\u3001\u4e8b\u4ef6\u89e6\u53d1\u7ebf\u7a0b\u3001\u5b9a\u65f6\u5668\u7ebf\u7a0b\u3001\u5f02\u6b65\u7f51\u7edc\u8bf7\u6c42\u7ebf\u7a0b<\/li>\n<li>\u5b8f\u4efb\u52a1\u5b58\u653e\u7531\u5f02\u6b65WebApis\u4ea7\u751f\u7684\u56de\u8c03\u51fd\u6570\uff0c\u4f46\u4f18\u5148\u7ea7\u4f4e\u4e8e\u5fae\u4efb\u52a1<\/li>\n<\/ul>\n<h5 class=\"heading\" data-id=\"heading-46\">js\u5355\u7ebf\u7a0b<\/h5>\n<ul>\n<li>js\u5355\u7ebf\u7a0b\u8bbe\u8ba1\u4e4b\u521d\u5c31\u662f\u4e3a\u4e86\u7b80\u5316\u4ee3\u7801\uff0c\u89e3\u51b3DOM\u51b2\u7a81\uff0c\u5982\u679cjs\u4e3a\u591a\u7ebf\u7a0b\u8bed\u8a00\uff0c\u90a3\u4e48\u6709\u53ef\u80fd\u4ea7\u751f\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u64cd\u4f5cDOM\u7684\u60c5\u51b5\uff0c\u90a3\u4e48\u5c06\u4f1a\u5bfc\u81f4js\u64cd\u4f5c\u540c\u4e2aDOM\u5f15\u8d77\u51b2\u7a81\uff0c\u4ecb\u4e8e\u591a\u7ebf\u7a0b\u7684\u9501\u673a\u5236\u6765\u89e3\u51b3\u51b2\u7a81\uff0c\u4f46\u53c8\u4f7f\u5f97js\u7684\u4ee3\u7801\u590d\u6742\u5ea6\u63d0\u9ad8<\/li>\n<li>\u57fa\u4e8ejs\u5355\u7ebf\u7a0b\u7684\u8bbe\u8ba1\uff0c\u8fdb\u800c\u5f15\u51fa\u5f02\u6b65\u6267\u884c\u7684\u65b9\u5f0f\uff0c\u4f7f\u5f97js\u5177\u6709\u7c7b\u4f3c\u591a\u7ebf\u7a0b\u7a0b\u7684\u6548\u679c\uff0c\u4f46\u4e0d\u7ba1\u5f02\u6b65\u8fd8\u662f\u540c\u6b65\uff0cjs\u6c38\u8fdc\u90fd\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u5728\u6267\u884c<\/li>\n<\/ul>\n<h5 class=\"heading\" data-id=\"heading-47\">EventLoop<\/h5>\n<ul>\n<li>\u4e8b\u4ef6\u5faa\u73af\u673a\u5236\u662f\u9488\u5bf9\u4e8e\u4e3b\u7ebf\u7a0b\u7684\u8c03\u5ea6\u65b9\u5f0f<\/li>\n<li>\u53ef\u4ee5\u7406\u89e3\u4e3a\u4e3b\u7ebf\u7a0b\u5728\u5bfb\u627e\u4efb\u52a1\u6267\u884c\u7684\u8fc7\u7a0b\u5c31\u662f\u4e8b\u4ef6\u5faa\u73af\uff0c\u5176\u5bfb\u627e\u65b9\u5f0f\u5c31\u662f\u8c03\u7528\u673a\u5236<\/li>\n<li>\u5148\u4e86\u89e3\u4e00\u4e0b\u6d4f\u89c8\u5668\u662f\u5982\u4f55\u6267\u884cjs\u4ee3\u7801\u7684\n<ul>\n<li>\u901a\u5e38\u6d4f\u89c8\u5668\u5728\u6700\u5f00\u59cb\u8fd0\u884cjs\u4ee3\u7801\u7684\u5165\u53e3\u5c31\u662fhtml\u4e2d\u7684script\u6807\u7b7e\u6240\u6db5\u76d6\u7684\u4ee3\u7801<\/li>\n<li>\u5f53GUI\u6e32\u67d3\u7ebf\u7a0b\u89e3\u6790\u5230script\u6807\u7b7e\uff0c\u5219\u4f1a\u628a\u6807\u7b7e\u6240\u6db5\u76d6\u7684js\u4ee3\u7801\u52a0\u5165\u5230\u5b8f\u4efb\u52a1\u961f\u5217\u4e2d<\/li>\n<li>\u9996\u5148js\u5f15\u64ce(\u5982V8\u5f15\u64ce)\u5148\u53d6\u7b2c\u4e00\u4e2a\u5b8f\u4efb\u52a1\uff0c\u5373script\u7684\u4ee3\u7801\u5757\uff0c\u7136\u540e\u4e3b\u7ebf\u7a0b\u5728\u8c03\u7528\u6808\u4e2d\u89e3\u6790js\u4ee3\u7801<\/li>\n<li>\u7b49\u6240\u6709\u4ee3\u7801\u89e3\u6790\u5b8c\u6210\u4e4b\u540e\u5f00\u59cb\u8fd0\u884cjs\u4ee3\u7801<\/li>\n<li>\u5982\u679c\u9047\u5230\u540c\u6b65\u4ee3\u7801\u76f4\u63a5\u6267\u884c<\/li>\n<li>\u9047\u5230\u5f02\u6b65\u4ee3\u7801\uff0c\u5982\u679c\u662f\u5b8f\u4efb\u52a1\u7c7b\u578b\u5373\u5f02\u6b65WebApis\u5904\u7406\u7684\u5f02\u6b65\u4ee3\u7801\uff0c\u90a3\u4e48\u5c06\u4f1a\u901a\u77e5WebApis\u5728\u5bf9\u5e94\u7684\u7ebf\u7a0b\u4e2d\u5904\u7406\u5f02\u6b65\u4efb\u52a1\uff0c\u6b64\u65f6js\u4e3b\u7ebf\u7a0b\u7ee7\u7eed\u6267\u884c\u4e0b\u9762\u7684\u4ee3\u7801\uff0c\u5728\u5176\u4ed6\u7ebf\u7a0b\u5904\u7406\u5b8c\u6bd5\u4e4b\u540e\u5982\u679c\u6709\u56de\u8c03\u51fd\u6570\uff0c\u5219\u5f02\u6b65\u7ebf\u7a0b\u4f1a\u5c06\u56de\u8c03\u51fd\u6570\u52a0\u5165\u5230\u5b8f\u4efb\u52a1\u961f\u5217\u5c3e\u90e8\uff0c<\/li>\n<li>\u5982\u679c\u662f\u5fae\u4efb\u52a1\u7c7b\u578b\u7684\u5f02\u6b65\u4ee3\u7801\uff0c\u4e5f\u540c\u5b8f\u4efb\u52a1\u5904\u7406\uff0c\u53ea\u4e0d\u8fc7\u662f\u628a\u56de\u8c03\u51fd\u6570\u52a0\u5165\u5230\u5fae\u4efb\u52a1\u961f\u5217\u4e2d\uff0c\u5176\u6267\u884c\u7684\u4f18\u5148\u7ea7\u9ad8\u4e8e\u5b8f\u4efb\u52a1\u961f\u5217<\/li>\n<li>\u5f53\u540c\u6b65\u4ee3\u7801\u5168\u90e8\u6267\u884c\u5b8c\u6210\uff0c\u4e3b\u7ebf\u7a0b\u5c06\u4f1a\u4e00\u76f4\u68c0\u6d4b\u4efb\u52a1\u961f\u5217\uff0c\u5982\u679c\u6709\u5f02\u6b65\u5fae\u4efb\u52a1\u5219\u6267\u884c\u5b8c\u5168\u90e8\u7684\u5fae\u4efb\u52a1<\/li>\n<li>\u8fdb\u4e00\u6b65\u6267\u884c\u6d4f\u89c8\u5668\u6e32\u67d3\u8fdb\u7a0b\u7ed8\u5236\u9875\u9762\uff0c\u4e4b\u540e\u5c31\u662f\u5f00\u59cb\u4e0b\u4e00\u8f6e\u7684\u4e8b\u4ef6\u5faa\u73af\uff0c\u5c31\u53c8\u56de\u5230\u53d6\u5b8f\u4efb\u52a1\u6267\u884c<\/li>\n<li>\u8fd9\u91cc\u6ce8\u610f\uff0c\u6240\u6709\u7684\u5fae\u4efb\u52a1\u90fd\u662f\u7531\u5b8f\u4efb\u52a1\u4e2d\u6267\u884c\u7684\u4ee3\u7801\u4ea7\u751f\uff0c\u4e00\u5f00\u59cb\u53ea\u6709\u5b8f\u4efb\u52a1\u961f\u5217\u6709\u4efb\u52a1<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u5c55\u793a\u7684\u662f\u4e8b\u4ef6\u5faa\u73af\u5927\u81f4\u6d41\u7a0b<\/p>\n<p><\/p><figure><img decoding=\"async\" alt=\"\u4e8b\u4ef6\u5faa\u73af\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d53968ef6d36?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"988\" data-height=\"769\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;988&quot; height=&quot;769&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<p>\u4ee5\u4e0b\u4e3a\u4e3b\u7ebf\u7a0b\u5224\u65ad\u903b\u8f91<\/p>\n<p><\/p><figure><img decoding=\"async\" alt=\"\u4e8b\u4ef6\u5224\u65ad\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d53df09b5cab?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"392\" data-height=\"740\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;392&quot; height=&quot;740&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<h3 class=\"heading\" data-id=\"heading-48\">\u524d\u7aef\u5f02\u6b65\u7684\u573a\u666f<\/h3>\n<ul>\n<li>\u524d\u7aef\u5f02\u6b65\u4e3b\u8981\u7528\u4e8e\u4ee3\u7801\u53ef\u80fd\u4f1a\u53d1\u751f\u7b49\u5f85\uff0c\u800c\u4e14\u7b49\u5f85\u8fc7\u7a0b\u4e0d\u80fd\u963b\u585e\u4e3b\u7ebf\u7a0b\u8fd0\u884c\u7684\u60c5\u51b5<\/li>\n<li>\u901a\u5e38WebApis\u63a5\u53e3\u90fd\u662f\u5f02\u6b65\u8c03\u7528\u7684\uff0c\u7531\u4e8e\u9700\u8981\u5176\u4ed6\u7ebf\u7a0b\u7684\u5904\u7406\uff0c\u5c31\u9700\u8981\u7b49\u5f85\u5176\u8fd4\u56de\u7ed3\u679c\uff0c\u90a3\u4e48js\u4e3b\u7ebf\u7a0b\u5c31\u6ca1\u5fc5\u8981\u4e00\u76f4\u7b49\u5f85\uff0c\u8fd9\u6837\u5c31\u9700\u8981\u4f7f\u7528\u5f02\u6b65\u6765\u8fdb\u884c\u5904\u7406<\/li>\n<li>\u6bd4\u5982\u5b9a\u65f6\u5668\u4efb\u52a1setTimeout\u3001setInterval\u3001ajax\u8bf7\u6c42\u3001\u56fe\u7247\u52a8\u6001\u52a0\u8f7d\u3001DOM\u4e8b\u4ef6\u89e6\u53d1\u8fd9\u4e9b\u90fd\u5c5e\u4e8e\u6d4f\u89c8\u5668\u6267\u884c\u7684\u5f02\u6b65\u4efb\u52a1\uff1b\u5982js\u4e2d\u7684Promise\u3001async\u3001await\u5c5e\u4e8ejs\u8bed\u8a00\u81ea\u8eab\u7684\u5f02\u6b65\u64cd\u4f5c\u8fd9\u4e9b\u90fd\u53ef\u4ee5\u5b9e\u73b0\u5f02\u6b65<\/li>\n<li>\u5f53\u9700\u8981\u52a8\u6001\u52a0\u8f7d\u56fe\u7247\u7684\u65f6\u5019\u5c31\u9700\u8981\u7528\u5230\u5f02\u6b65\uff1b\u5f53\u9700\u8981\u6267\u884c\u7684js\u7684\u540c\u6b65\u4ee3\u7801\u9700\u8981\u957f\u65f6\u95f4\u5360\u7528\u7684\u4e3b\u7ebf\u7a0b\u65f6\u53ef\u4ee5\u4f7f\u7528\u5f02\u6b65\u65b9\u5f0f\u62c6\u5206\u4e3a\u591a\u4e2a\u6b65\u9aa4\u6267\u884c\uff0c\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u6d4f\u89c8\u5668\u9875\u9762\u957f\u65f6\u95f4\u65e0\u54cd\u5e94\u6216\u8005\u5361\u987f<\/li>\n<li>\u5f53\u9700\u8981\u6267\u884c\u5f88\u957f\u4e00\u6bb5\u65f6\u95f4\u624d\u80fd\u5f97\u5230\u7ed3\u679c\u7684\u4ee3\u7801\u65f6\u4e5f\u53ef\u4ee5\u4f7f\u7528html5\u4e2d\u7684Web worker\u5728\u6d4f\u89c8\u5668\u6e32\u67d3\u8fdb\u7a0b\u4e0b\u65b0\u5f00\u4e00\u4e2a\u7ebf\u7a0b\u7528\u6765\u4e13\u95e8\u6267\u884c\u6b64\u4ee3\u7801\uff0c\u901a\u8fc7postMessage\u6765\u8fd4\u56de\u8fd0\u884c\u7ed3\u679c\u8fd9\u6837\u4e5f\u4e0d\u4f1a\u5360\u7528js\u4e3b\u7ebf\u7a0b\uff0c\u4f46\u662f\u8fd9\u4e2a\u7ebf\u7a0b\u65e0\u6cd5\u64cd\u4f5cDOM\u548cBOM<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-49\">WebWorker\u591a\u7ebf\u7a0b<\/h3>\n<ul>\n<li>\u57fa\u4e8ejs\u5355\u7ebf\u7a0b\u7684\u5c40\u9650\u6027\uff0c\u5982\u679c\u6267\u884c\u4e00\u4e2a\u5f88\u8017\u65f6\u95f4\u7684\u51fd\u6570\uff0c\u90a3\u4e48\u4e3b\u7ebf\u7a0b\u5c06\u4f1a\u88ab\u957f\u65f6\u95f4\u5360\u7528\uff0c\u56e0\u6b64\u5bfc\u81f4\u4e8b\u4ef6\u5faa\u73af\u6682\u505c\uff0c\u4f7f\u5f97\u6d4f\u89c8\u5668\u65e0\u6cd5\u53ca\u65f6\u6e32\u67d3\u548c\u54cd\u5e94\uff0c\u90a3\u4e48\u5c06\u4f1a\u9020\u6210\u9875\u9762\u5d29\u6e83\uff0c\u7528\u6237\u4f53\u9a8c\u4e0b\u964d\uff0c\u6240\u4ee5html5\u652f\u6301\u4e86webworker<\/li>\n<li>webwork\u7b80\u5355\u7406\u89e3\u5c31\u662f\u53ef\u4ee5\u8ba9\u7279\u5b9a\u7684js\u4ee3\u7801\u5728\u5176\u4ed6\u7ebf\u7a0b\u4e2d\u6267\u884c\uff0c\u7b49\u6267\u884c\u7ed3\u675f\u540e\u8fd4\u56de\u7ed3\u679c\u7ed9\u4e3b\u7ebf\u7a0b\u63a5\u6536\u5373\u53ef<\/li>\n<li>\u6bd4\u5982\u5728js\u4e2d\u9700\u8981\u5b9e\u73b0\u4e00\u4e2a\u8bc6\u522b\u56fe\u7247\u7684\u7b97\u6cd5\uff0c\u800c\u4e14\u6b64\u7b97\u6cd5\u9700\u8981\u5f88\u957f\u7684\u8ba1\u7b97\u65f6\u95f4\uff0c\u5982\u679c\u8ba9js\u4e3b\u7ebf\u7a0b\u6765\u6267\u884c\u5c06\u4f1a\u5bfc\u81f4\u4e0a\u8ff0\u53d1\u751f\u7684\u4e8b\u60c5\uff0c\u90a3\u4e48\u6b63\u597d\u53ef\u4ee5\u4f7f\u7528webwork\u6280\u672f\u6765\u5b9e\u73b0\u3002<\/li>\n<li>\u521b\u5efa\u4e00\u4e2awebworker\u6587\u4ef6\uff0c\u5176\u4e2d\u5199\u5165\u7b97\u6cd5\u4ee3\u7801\uff0c\u5728\u6700\u540e\u8c03\u7528postMessage(result)\u65b9\u6cd5\u8fd4\u56de\u7ed3\u679c\u7ed9\u4e3b\u7ebf\u7a0b\uff0cjs\u4e3b\u4ee3\u7801\u4e2d\u901a\u8fc7w=new Worker(\u6587\u4ef6\u8def\u5f84)\u6765\u521b\u5efa\u4e00\u4e2a\u6e32\u67d3\u8fdb\u7a0b\u7684webworker\u5b50\u7ebf\u7a0b\u5b9e\u4f8b\uff0c\u901a\u8fc7w.onmessage=function(e){console.log(e.data)}\u7ed9\u5176\u6dfb\u52a0\u4e00\u4e2a\u4e8b\u4ef6\u76d1\u542c\u5668\uff0c\u5f53webworker\u4e2d\u4f20\u9012\u6d88\u606f\u7ed9js\u4e3b\u7ebf\u7a0b\u65f6\u4f1a\u5728\u6b64\u56de\u8c03\u51fd\u6570\u4e2d\u6267\u884c\uff0c\u901a\u8fc7\u8c03\u7528w.terminate()\u7ec8\u6b62webworker\u7ebf\u7a0b<\/li>\n<li>webworker\u7ebf\u7a0b\u4e0ejs\u4e3b\u7ebf\u7a0b\u6700\u5927\u7684\u533a\u522b\u5c31\u5728\u4e8ewebworker\u7ebf\u7a0b\u65e0\u6cd5\u64cd\u4f5cwindow\u4e0edocument\u5bf9\u8c61<\/li>\n<\/ul>\n<pre><code class=\"hljs webworker copyable\" lang=\"webworker\">\/\/ test.html(\u4e3b\u7ebf\u7a0b)\nconst w= new Worker('postMessage.js')\nw.onmessage=function(e){\n  console.log(e.data);\n}\nw.postMessage('b') \/\/ b is cat\nw.terminate() \/\/ \u624b\u52a8\u5173\u95ed\u5b50\u7ebf\u7a0b\n----------------------------------------------\n\/\/ postMessage.js(worker\u7ebf\u7a0b)\nthis.addEventListener('message', (e) =&gt; {\n  switch (e.data) {\n    case 'a': this.postMessage(e.data+' is tom')\n      break;\n    case 'b': this.postMessage(e.data + ' is cat')\n      break;\n    default:  this.postMessage(e.data + \" i don't know\")\n    this.close() \/\/ \u81ea\u8eab\u5173\u95ed\n      break;\n  }\n})\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h2 class=\"heading\" data-id=\"heading-50\"><span id=\"10\">\u5341\u3001AMD\u3001CMD\u3001CommonJS\u4e0eES6\u6a21\u5757\u5316<\/span><\/h2>\n<p>\u6a21\u5757\u5316\u7684\u5f15\u5165\u4e3b\u8981\u662f\u7528\u4e8e\u89e3\u51b3\u547d\u540d\u51b2\u7a81\u3001\u4ee3\u7801\u590d\u7528\u3001\u4ee3\u7801\u53ef\u8bfb\u6027\u3001\u4f9d\u8d56\u7ba1\u7406\u7b49<\/p>\n<h3 class=\"heading\" data-id=\"heading-51\">AMD\u5f02\u6b65\u6a21\u5757\u5b9a\u4e49<\/h3>\n<ul>\n<li>AMD\u5168\u79f0Asynchronous Module Definition\u5f02\u6b65\u6a21\u5757\u5b9a\u4e49<\/li>\n<li>AMD\u5e76\u975e\u539f\u751fjs\u652f\u6301\uff0c\u662fRequireJS\u6a21\u5757\u5316\u5f00\u53d1\u5f53\u4e2d\u63a8\u5e7f\u7684\u4ea7\u7269\uff0cAMD\u4f9d\u8d56\u4e8eRequireJS\u51fd\u6570\u5e93\uff0c\u6253\u5305\u751f\u6210\u5bf9\u5e94\u6548\u679c\u7684js\u4ee3\u7801<\/li>\n<li>RequireJS\u4e3b\u8981\u7528\u4e8e\u89e3\u51b3\u591a\u4e2ajs\u6587\u4ef6\u4e4b\u95f4\u7684\u4f9d\u8d56\u5173\u7cfb\u3001\u6d4f\u89c8\u5668\u52a0\u8f7d\u5927\u91cfjs\u4ee3\u7801\u5bfc\u81f4\u65e0\u54cd\u5e94\u3001\u5f02\u6b65\u52a0\u8f7d\u6a21\u5757<\/li>\n<li>RequireJS\u901a\u8fc7<code>define(id?,dependencies?,factory)<\/code>\u5b9a\u4e49\u6a21\u5757\uff0cid\u53ef\u9009\uff0c\u4e3a\u5b9a\u4e49\u6a21\u5757\u7684\u6807\u8bc6\uff0c\u9ed8\u8ba4\u4e3a\u6a21\u5757\u6587\u4ef6\u540d\u4e0d\u5305\u62ec\u540e\u7f00\uff0cdependencies\u53ef\u9009\uff0c\u662f\u5f53\u524d\u6a21\u5757\u4f9d\u8d56\u7684\u6a21\u5757\u8def\u5f84\u6570\u7ec4\uff0cfactory\u4e3a\u5de5\u5382\u65b9\u6cd5\uff0c\u521d\u59cb\u5316\u6a21\u5757\u7684\u51fd\u6570\u6216\u8005\u5bf9\u8c61\uff0c\u5982\u679c\u4e3a\u51fd\u6570\u5c06\u4f1a\u53ea\u6267\u884c\u4e00\u6b21\uff0c\u5982\u679c\u662f\u5bf9\u8c61\u5c06\u4f5c\u4e3a\u6a21\u5757\u7684\u8f93\u51fa<\/li>\n<li>\u901a\u8fc7<code>require(dependencies,factory)<\/code>\u5bfc\u5165\u6a21\u5757\uff0c\u5176\u4e2ddependencies\u4e3a\u9700\u8981\u5bfc\u5165\u7684\u6a21\u5757\u8def\u5f84\u6570\u7ec4\uff0cfactory\u4e3a\u5f53\u6a21\u5757\u5bfc\u5165\u4e4b\u540e\u7684\u56de\u8c03\u51fd\u6570\uff0c\u6b64\u51fd\u6570\u7684\u53c2\u6570\u5217\u8868\u4e3a\u5bf9\u5e94\u5bfc\u5165\u7684\u6a21\u5757<\/li>\n<li>\u901a\u8fc7require.config(\u914d\u7f6e\u5bf9\u8c61)\u914d\u7f6e\u5404\u6a21\u5757\u8def\u5f84\u548c\u5f15\u7528\u540d<\/li>\n<\/ul>\n<pre><code class=\"hljs \u914d\u7f6eAMD copyable\" lang=\"\u914d\u7f6eAMD\">require.config({\n  baseUrl: \"js\/lib\",\n  paths: {\n    \"jquery\": \"jquery.min\",  \/\/\u5b9e\u9645\u8def\u5f84\u4e3ajs\/lib\/jquery.min.js\n    \"underscore\": \"underscore.min\",\n  }\n})\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h3 class=\"heading\" data-id=\"heading-52\">CMD\u901a\u7528\u6a21\u5757\u5b9a\u4e49<\/h3>\n<ul>\n<li>CMD\u5168\u79f0Common Module Definition\u901a\u7528\u6a21\u5757\u5b9a\u4e49<\/li>\n<li>\u540cAMD\uff0cCMD\u4e5f\u6709\u4e00\u4e2a\u51fd\u6570\u5e93SeaJS\u4e0eRequireJS\u7c7b\u4f3c\u7684\u529f\u80fd<\/li>\n<li>CMD\u63a8\u5d07\u4e00\u4e2a\u6587\u4ef6\u4e00\u4e2a\u6a21\u5757\uff0c\u63a8\u5d07\u4f9d\u8d56\u5c31\u8fd1\uff0c\u5b9a\u4e49\u6a21\u5757<code>define(id?,deps?,factory)<\/code>\uff0cid\u540cAMD\uff0cdeps\u4e00\u822c\u4e0d\u5728\u5176\u4e2d\u5199\u4f9d\u8d56\uff0c\u800c\u662f\u5728factory\u4e2d\u5728\u9700\u8981\u4f7f\u7528\u7684\u65f6\u5019\u5f15\u5165\u6a21\u5757\uff0cfactory\u51fd\u6570\u63a5\u65363\u5404\u53c2\u6570\uff0c\u53c2\u6570\u4e00require\u65b9\u6cd5\uff0c\u7528\u6765\u5185\u90e8\u5f15\u5165\u6a21\u5757\u7684\u65f6\u5019\u8c03\u7528\uff0c\u53c2\u6570\u4e8cexports\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u7528\u6765\u5411\u5916\u90e8\u63d0\u4f9b\u6a21\u5757\u63a5\u53e3\uff0c\u53c2\u6570\u4e09module\u4e5f\u662f\u4e00\u4e2a\u5bf9\u8c61\u4e0a\u9762\u5b58\u50a8\u4e86\u4e0e\u5f53\u524d\u6a21\u5757\u76f8\u5173\u8054\u7684\u4e00\u4e9b\u5c5e\u6027\u548c\u65b9\u6cd5<\/li>\n<li>\u901a\u8fc7<code>seajs.use(deps,func)<\/code>\u52a0\u8f7d\u6a21\u5757\uff0cdeps\u4e3a\u5f15\u5165\u5230\u6a21\u5757\u8def\u5f84\u6570\u7ec4\uff0cfunc\u4e3a\u52a0\u8f7d\u5b8c\u6210\u540e\u7684\u56de\u8c03\u51fd\u6570<\/li>\n<\/ul>\n<p>AMD\u3001CMD\u7684\u4e3b\u8981\u533a\u522b\u5728\u4e8e<\/p>\n<p>AMD\u63a8\u5d07\u4f9d\u8d56\u524d\u7f6e\uff0c\u5728\u5b9a\u4e49\u6a21\u5757\u7684\u65f6\u5019\u5c31\u8981\u58f0\u660e\u5176\u4f9d\u8d56\u7684\u6a21\u5757\nCMD\u63a8\u5d07\u5c31\u8fd1\u4f9d\u8d56\uff0c\u53ea\u6709\u5728\u7528\u5230\u67d0\u4e2a\u6a21\u5757\u7684\u65f6\u5019\u518d\u53bbrequire<\/p>\n<h3 class=\"heading\" data-id=\"heading-53\">CommonJS<\/h3>\n<ul>\n<li>CommonJS\u6a21\u5757\u89c4\u8303\uff0c\u901a\u5e38\u7528\u4e8eNodejs\u4e2d\u7684\u6a21\u5757\u5316<\/li>\n<li>\u62e5\u67094\u4e2a\u73af\u5883\u53d8\u91cfmodul\u3001exports\u3001require\u3001global<\/li>\n<li>\u901a\u8fc7<code>module.exports<\/code>(\u4e0d\u63a8\u8350exports)\u5bfc\u51fa\u6a21\u5757\u5bf9\u8c61\uff0c\u901a\u8fc7require(\u6a21\u5757\u8def\u5f84)\u52a0\u8f7d\u6a21\u5757<\/li>\n<li>\u5f53\u4e00\u4e2a\u6a21\u5757\u540c\u65f6\u5b58\u5728exports\u548cmodule.exports\u65f6\u540e\u8005\u8986\u76d6\u524d\u8005<\/li>\n<li>\u89c4\u8303\u4e2d<code>__dirname<\/code>\u4ee3\u8868\u5f53\u524d\u6a21\u5757\u6587\u4ef6\u6240\u5728\u7684\u6587\u4ef6\u5939\u8def\u5f84\uff0c<code>__filename<\/code>\u4ee3\u8868\u5f53\u524d\u6a21\u5757\u6587\u4ef6\u5939\u8def\u5f84+\u6587\u4ef6\u540d<\/li>\n<li>CommonJS\u901a\u8fc7\u540c\u6b65\u7684\u65b9\u5f0f\u52a0\u8f7d\u6a21\u5757\uff0c\u5176\u8f93\u51fa\u7684\u6a21\u5757\u662f\u4e00\u4e2a\u62f7\u8d1d\u5bf9\u8c61\uff0c\u6240\u4ee5\u4fee\u6539\u539f\u7684\u6a21\u5757\u4e0d\u4f1a\u5bf9\u88ab\u5f15\u5165\u7684\u6a21\u5757\u5185\u90e8\u4ea7\u751f\u5f71\u54cd\uff0c\u4e14\u6a21\u5757\u5728\u4ee3\u7801\u8fd0\u884c\u7684\u65f6\u5019\u52a0\u8f7d<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-54\">ES6\u6a21\u5757\u5316<\/h3>\n<ul>\n<li>es6\u5f15\u5165\u7684export\u4e0eimport\u7528\u4e8e\u89e3\u51b3js\u81ea\u8eab\u4e0d\u5177\u5907\u6a21\u5757\u529f\u80fd\u7684\u7f3a\u9677<\/li>\n<li>\u901a\u8fc7export\u6216\u8005export default\u5bfc\u51fa\u6a21\u5757\u63a5\u53e3\uff0c\u901a\u8fc7import xxx from &#8216;\u8def\u5f84&#8217;\uff0c\u5bfc\u5165\u6a21\u5757<\/li>\n<li>\u5bf9\u4e8eexport\u5bfc\u51fa\u7684\u63a5\u53e3\u53ef\u4ee5\u4f7f\u7528import {\u63a5\u53e3} from &#8216;\u8def\u5f84&#8217;\uff0c\u901a\u8fc7\u89e3\u6784\u7684\u65b9\u5f0f\u6309\u9700\u5bfc\u5165<\/li>\n<li>\u5bf9\u4e8eexport default\u9ed8\u8ba4\u5bfc\u51fa\u7684\uff0c\u53ef\u4ee5\u4f7f\u7528import xxx from &#8216;\u8def\u5f84&#8217;\uff0c\u6765\u5bfc\u5165\u9ed8\u8ba4\u5bfc\u51fa\u7684\u63a5\u53e3\uff0cxxx\u53ef\u4ee5\u662f\u81ea\u5b9a\u4e49\u540d\u79f0\uff0c\u4e14\u4e00\u4e2a\u6a21\u5757\u53ea\u80fd\u6709\u4e00\u4e2a\u9ed8\u8ba4\u5bfc\u51fa\uff0c\u53ef\u4ee5\u6709\u591a\u4e2aexport<\/li>\n<li>\u8fd8\u53ef\u4ee5\u901a\u8fc7\u522b\u540d\u7684\u65b9\u5f0f\u8bbe\u7f6e\u5bfc\u51fa\u548c\u5bfc\u5165\u7684\u63a5\u53e3\u540d\uff0c\u5982export {a as foo}\uff0c\u628afoo\u4f5c\u4e3aa\u7684\u522b\u540d\u5bfc\u51fa\uff0cimport foo as b from \u8def\u5f84\uff0c\u628ab\u5f53\u4f5cfoo\u7684\u522b\u540d\u5bfc\u5165<\/li>\n<li>es6\u6a21\u5757\u662f\u5728\u4ee3\u7801\u7f16\u8bd1\u65f6\u8f93\u51fa\u63a5\u53e3\u5373\u7f16\u8bd1\u65f6\u52a0\u8f7d\uff0ces6\u662f\u901a\u8fc7\u547d\u4ee4\u6765\u6307\u5b9a\u5bfc\u51fa\u548c\u52a0\u8f7d\uff0c\u4e14\u5bfc\u51fa\u7684\u662f\u6a21\u5757\u4e2d\u7684\u53ea\u8bfb\u5f15\u7528\uff0c\u5982\u679c\u539f\u59cb\u6a21\u5757\u4e2d\u7684\u503c\u88ab\u6539\u53d8\u4e86\uff0c\u90a3\u4e48\u52a0\u8f7d\u7684\u503c\u4e5f\u4f1a\u968f\u4e4b\u6539\u53d8\uff0c\u6240\u4ee5\u662f\u52a8\u6001\u5f15\u7528<\/li>\n<\/ul>\n<h2 class=\"heading\" data-id=\"heading-55\"><span id=\"11\">\u5341\u4e00\u3001script\u6807\u7b7e\u4e4basync\u4e0edefer<\/span><\/h2>\n<h3 class=\"heading\" data-id=\"heading-56\">\u4f7f\u7528async\u5c5e\u6027<\/h3>\n<ul>\n<li>\u5982\u679cscript\u6807\u7b7e\u8bbe\u7f6e\u4e86\u8fd9\u4e2a\u503c\uff0c\u5219\u8bf4\u660e\u5f15\u5165\u7684js\u9700\u8981\u5f02\u6b65\u52a0\u8f7d\u548c\u6267\u884c\uff0c\u6ce8\u610f\u6b64\u5c5e\u6027\u53ea\u9002\u7528\u4e8e\u5916\u90e8\u5f15\u5165\u7684js<\/li>\n<li>\u5728\u6709async\u7684\u60c5\u51b5\u4e0b\u811a\u672c\u5f02\u6b65\u52a0\u8f7d\u548c\u6267\u884c\uff0c\u5e76\u4e14\u4e0d\u4f1a\u963b\u585e\u9875\u9762\u52a0\u8f7d\uff0c\u4f46\u662f\u4e5f\u5e76\u4e0d\u4f1a\u4fdd\u8bc1\u5176\u52a0\u8f7d\u7684\u987a\u5e8f\uff0c\u5982\u679c\u591a\u4e2aasync\u4f18\u5148\u6267\u884c\uff0c\u5219\u5148\u52a0\u8f7d\u597d\u7684js\u6587\u4ef6\uff0c\u6240\u4ee5\u4f7f\u7528\u6b64\u65b9\u5f0f\u52a0\u8f7d\u7684js\u6587\u4ef6\u6700\u597d\u4e0d\u8981\u5305\u542b\u5176\u4ed6\u4f9d\u8d56<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-57\">\u4f7f\u7528defer\u5c5e\u6027<\/h3>\n<ul>\n<li>\u5982\u679c\u4f7f\u7528\u6b64\u5c5e\u6027\uff0c\u4e5f\u5c06\u4f1a\u4f7fjs\u5f02\u6b65\u52a0\u8f7d\u6267\u884c\uff0c\u4e14\u4f1a\u5728\u6587\u6863\u88ab\u89e3\u6790\u5b8c\u6210\u540e\u6267\u884c\uff0c\u8fd9\u6837\u5c31\u4e0d\u4f1a\u963b\u585e\u9875\u9762\u52a0\u8f7d\uff0c\u4f46\u662f\u5b83\u5c06\u4f1a\u6309\u7167\u539f\u6765\u7684\u6267\u884c\u987a\u5e8f\u6267\u884c\uff0c\u5bf9\u4e8e\u6709\u4f9d\u8d56\u5173\u7cfb\u7684\u4e5f\u53ef\u4f7f\u7528<\/li>\n<li>html4.0\u4e2d\u5b9a\u4e49\u4e86defer\uff0chtml5.0\u4e2d\u5b9a\u4e49\u4e86async<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-58\">\u4e0d\u540c\u60c5\u51b5<\/h3>\n<ul>\n<li>\u5982\u679c\u53ea\u6709async\uff0c\u90a3\u4e48\u811a\u672c\u5728\u4e0b\u8f7d\u5b8c\u6210\u540e\u5f02\u6b65\u6267\u884c\u3002<\/li>\n<li>\u5982\u679c\u53ea\u6709defer\uff0c\u90a3\u4e48\u811a\u672c\u4f1a\u5728\u9875\u9762\u89e3\u6790\u5b8c\u6bd5\u4e4b\u540e\u6267\u884c\u3002<\/li>\n<li>\u5982\u679c\u90fd\u6ca1\u6709\uff0c\u90a3\u4e48\u811a\u672c\u4f1a\u5728\u9875\u9762\u4e2d\u9a6c\u4e0a\u89e3\u6267\u884c\uff0c\u505c\u6b62\u6587\u6863\u89e3\u6790\u963b\u585e\u9875\u9762\u52a0\u8f7d<\/li>\n<li>\u5982\u679c\u90fd\u6709\u90a3\u4e48\u540casync\uff0c\u5f53\u7136\u6b64\u60c5\u51b5\u4e00\u822c\u7528\u4e8ehtml\u7684\u7248\u672c\u517c\u5bb9\u4e0b\uff0c\u5982\u679c\u6ca1\u6709async\u5219defer\u751f\u6548<\/li>\n<li>\u4e0d\u8fc7\u8fd8\u662f\u63a8\u8350\u76f4\u63a5\u628ascript\u6807\u7b7e\u653e\u5728body\u5e95\u90e8<\/li>\n<\/ul>\n<h2 class=\"heading\" data-id=\"heading-59\"><span id=\"12\">\u5341\u4e8c\u3001\u6539\u53d8\u6570\u7ec4\u672c\u8eab\u7684api<\/span><\/h2>\n<ol>\n<li><code>pop()<\/code>  \u5c3e\u90e8\u5f39\u51fa\u4e00\u4e2a\u5143\u7d20<\/li>\n<li><code>push()<\/code> \u5c3e\u90e8\u63d2\u5165\u4e00\u4e2a\u5143\u7d20<\/li>\n<li><code>shift()<\/code>  \u5934\u90e8\u5f39\u51fa\u4e00\u4e2a\u5143\u7d20<\/li>\n<li><code>unshift()<\/code>  \u5934\u90e8\u63d2\u5165\u4e00\u4e2a\u5143\u7d20<\/li>\n<li><code>sort([func])<\/code> \u5bf9\u6570\u7ec4\u8fdb\u884c\u6392\u5e8f,func\u67092\u5404\u53c2\u6570\uff0c\u5176\u8fd4\u56de\u503c\u5c0f\u4e8e0\uff0c\u90a3\u4e48\u53c2\u65701\u88ab\u6392\u5217\u5230\u53c2\u65702\u4e4b\u524d\uff0c\u53cd\u4e4b\u53c2\u65702\u6392\u5728\u53c2\u65701\u4e4b\u524d<\/li>\n<li>reverse() \u539f\u4f4d\u53cd\u8f6c\u6570\u7ec4\u4e2d\u7684\u5143\u7d20<\/li>\n<li><code>splice(pos,deleteCount,...item)<\/code>  \u8fd4\u56de\u4fee\u6539\u540e\u7684\u6570\u7ec4\uff0c\u4ecepos\u5f00\u59cb\u5220\u9664deleteCount\u4e2a\u5143\u7d20\uff0c\u5e76\u5728\u5f53\u524d\u4f4d\u7f6e\u63d2\u5165items<\/li>\n<li><code>copyWithin(pos[, start[, end]])<\/code> \u590d\u5236\u4ecestart\u5230end(\u4e0d\u5305\u62ecend)\u7684\u5143\u7d20\uff0c\u5230pos\u5f00\u59cb\u7684\u7d22\u5f15\uff0c\u8fd4\u56de\u6539\u53d8\u540e\u7684\u6570\u7ec4\uff0c\u6d45\u62f7\u8d1d<\/li>\n<li><code>arr.fill(value[, start[, end]])<\/code> \u4ecestart\u5230end\u9ed8\u8ba4\u5230\u6570\u7ec4\u6700\u540e\u4e00\u4e2a\u4f4d\u7f6e\uff0c\u4e0d\u5305\u62ecend\uff0c\u586b\u5145val\uff0c\u8fd4\u56de\u586b\u5145\u540e\u7684\u6570\u7ec4<\/li>\n<\/ol>\n<p>\u5176\u4ed6\u6570\u7ec4api\u4e0d\u6539\u53d8\u539f\u6570\u7ec4<\/p>\n<h2 class=\"heading\" data-id=\"heading-60\"><span id=\"13\">\u5341\u4e09\u3001window\u4e4blocation\u3001navigator<\/span><\/h2>\n<h3 class=\"heading\" data-id=\"heading-61\">location\u5bf9\u8c61<\/h3>\n<ul>\n<li>location\u4e3a\u5168\u5c40\u5bf9\u8c61window\u7684\u4e00\u4e2a\u5c5e\u6027\uff0c\u4e14<code>window.location===document.location<\/code>\uff0c\u5176\u4e2d\u7684\u5c5e\u6027\u90fd\u662f\u53ef\u8bfb\u5199\u7684\uff0c\u4f46\u662f\u53ea\u6709\u4fee\u6539<strong>href<\/strong>\u548c<strong>hash<\/strong>\u624d\u6709\u610f\u4e49\uff0chref\u4f1a\u91cd\u65b0\u5b9a\u4f4d\u5230\u4e00\u4e2aURL\uff0chash\u4f1a\u8df3\u5230\u5f53\u524d\u9875\u9762\u4e2d\u7684anchor\u540d\u5b57\u7684\u6807\u8bb0(\u5982\u679c\u6709)\uff0c\u800c\u4e14\u9875\u9762\u4e0d\u4f1a\u88ab\u91cd\u65b0\u52a0\u8f7d<\/li>\n<\/ul>\n<pre><code class=\"hljs location copyable\" lang=\"location\">\/\/ \u8fd9\u884c\u4ee3\u7801\u5c06\u4f1a\u4f7f\u5f53\u524d\u9875\u9762\u91cd\u5b9a\u5411\u5230http:\/\/www.baidu.com\nwindow.location.href = 'http:\/\/www.baidu.com'\n----------------------------------------------\n\/\/ \u5982\u679c\u4f7f\u7528hash\u5e76\u4e14\u914d\u5408input\u8f93\u5165\u6846\uff0c\u90a3\u4e48\u5f53\u9875\u9762\u5237\u65b0\u4e4b\u540e\uff0c\u9f20\u6807\u5c06\u4f1a\u81ea\u52a8\u805a\u7126\u5230\u5bf9\u5e94id\u7684input\u8f93\u5165\u6846\uff0c\n&lt;input type=\"text\" id=\"target\"&gt;\n&lt;script&gt;\n  window.location.hash = '#target'\n&lt;\/script&gt;\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p>\u5148\u770b\u4e0b\u5176\u62e5\u6709\u7684\u5c5e\u6027<\/p>\n<p><\/p><figure><img decoding=\"async\" alt=\"location\u5c5e\u6027\" class=\"lazyload inited loaded\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d5465e6deae5?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"1256\" data-height=\"520\" src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d5465e6deae5?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\"><figcaption><\/figcaption><\/figure><p><\/p>\n<p>\u8fd9\u91cc\u8865\u5145\u4e00\u4e2a<strong>origin<\/strong>\u5c5e\u6027\uff0c<code>\u8fd4\u56deURL\u534f\u8bae+\u670d\u52a1\u5668\u540d\u79f0+\u7aef\u53e3\u53f7 (location.origin == location.protocol + '\/\/' + location.host)<\/code><\/p>\n<ul>\n<li>\u53ef\u4ee5\u901a\u8fc7\u4e0a\u8ff0\u5c5e\u6027\u6765\u83b7\u53d6URL\u4e2d\u7684\u6307\u5b9a\u90e8\u5206\uff0c\u6216\u8005\u4fee\u6539href\u4e8ehash\u8fbe\u5230\u91cd\u65b0\u5b9a\u4f4d\u4e0e\u8df3\u8f6c<\/li>\n<li>\u6dfb\u52a0hash\u6539\u53d8\u76d1\u542c\u5668\uff0c\u6765\u63a7\u5236hash\u6539\u53d8\u65f6\u6267\u884c\u7684\u4ee3\u7801<\/li>\n<\/ul>\n<pre><code class=\"hljs \u6dfb\u52a0hash\u6539\u53d8\u4e8b\u4ef6 copyable\" lang=\"\u6dfb\u52a0hash\u6539\u53d8\u4e8b\u4ef6\">window.addEventListener(\"hashchange\", funcRef);\n\/\/ \u6216\u8005\nwindow.onhashchange = funcRef;\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p>location\u65b9\u6cd5<\/p>\n<p><\/p><figure><img decoding=\"async\" alt=\"location\u65b9\u6cd5\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d54a9be043de?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"1038\" data-height=\"414\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;1038&quot; height=&quot;414&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<ul>\n<li><code>assign(url)<\/code>,\u901a\u8fc7\u8c03\u7528<code>window.location.assign<\/code>\u65b9\u6cd5\u6765\u6253\u5f00\u6307\u5b9aurl\u7684\u65b0\u9875\u9762<code>window.location.assign('http:\/\/www.baidu.com')<\/code>\u5728\u5f53\u524d\u9875\u9762\u6253\u5f00\u767e\u5ea6\uff0c\u53ef\u56de\u9000<\/li>\n<li><code>replace(url)<\/code>,\u5728\u5f53\u524d\u9875\u9762\u6253\u5f00\u6307\u5b9aurl\uff0c\u4e0d\u53ef\u56de\u9000<\/li>\n<li><code>reload([Boolean])<\/code>,\u8c03\u7528\u6b64\u65b9\u6cd5\u5c06\u4f1a\u91cd\u65b0\u52a0\u8f7d\u5f53\u524d\u9875\u9762\uff0c\u5982\u679c\u53c2\u6570\u4e3afalse\u6216\u8005\u4e0d\u586b\uff0c\u5219\u4f1a\u4ee5\u6700\u4f18\u7684\u65b9\u5f0f\u91cd\u65b0\u52a0\u8f7d\u9875\u9762\uff0c\u53ef\u80fd\u4ece\u7f13\u5b58\u4e2d\u53d6\u8d44\u6e90\uff0c\u5982\u679c\u53c2\u6570\u4e3atrue\u5219\u4f1a\u4ece\u670d\u52a1\u5668\u91cd\u65b0\u8bf7\u6c42\u52a0\u8f7d\u8d44\u6e90<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-62\">navigator\u5bf9\u8c61<\/h3>\n<ul>\n<li><code>window.navigator<\/code>\u5bf9\u8c61\u5305\u542b<strong>\u6709\u5173\u6d4f\u89c8\u5668\u7684\u4fe1\u606f<\/strong>\uff0c\u53ef\u4ee5\u7528\u5b83\u6765\u67e5\u8be2\u4e00\u4e9b\u5173\u4e8e\u8fd0\u884c\u5f53\u524d\u811a\u672c\u7684\u5e94\u7528\u7a0b\u5e8f\u7684\u76f8\u5173\u4fe1\u606f<\/li>\n<\/ul>\n<pre><code class=\"hljs navigator copyable\" lang=\"navigator\">document.write(\"\u6d4f\u89c8\u5668\u7684\u4ee3\u7801\u540d:\" + navigator.appCodeName + \"&lt;br&gt;\");\ndocument.write(\"\u6d4f\u89c8\u5668\u7684\u540d\u79f0:\" + navigator.appName + \"&lt;br&gt;\");\ndocument.write(\"\u5f53\u524d\u6d4f\u89c8\u5668\u7684\u8bed\u8a00:\" + navigator.browserLanguage + \"&lt;br&gt;\");\ndocument.write(\"\u6d4f\u89c8\u5668\u7684\u5e73\u53f0\u548c\u7248\u672c\u4fe1\u606f:\" + navigator.appVersion + \"&lt;br&gt;\");\ndocument.write(\"\u6d4f\u89c8\u5668\u4e2d\u662f\u5426\u542f\u7528 cookie :\" + navigator.cookieEnabled + \"&lt;br&gt;\");\ndocument.write(\"\u8fd0\u884c\u6d4f\u89c8\u5668\u7684\u64cd\u4f5c\u7cfb\u7edf\u5e73\u53f0 :\" + navigator.platform + \"&lt;br&gt;\");\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li><code>navigator.appCodeName<\/code> \u53ea\u8bfb,\u4efb\u4f55\u6d4f\u89c8\u5668\u4e2d\uff0c\u603b\u662f\u8fd4\u56de &#8216;Gecko&#8217;\u3002\u8be5\u5c5e\u6027\u4ec5\u4ec5\u662f\u4e3a\u4e86\u4fdd\u6301\u517c\u5bb9\u6027\u3002<\/li>\n<li><code>navigator.appName<\/code> \u53ea\u8bfb,\u8fd4\u56de\u6d4f\u89c8\u5668\u7684\u5b98\u65b9\u540d\u79f0\u3002\u4e0d\u8981\u6307\u671b\u8be5\u5c5e\u6027\u8fd4\u56de\u6b63\u786e\u7684\u503c\u3002<\/li>\n<li><code>navigator.appVersion<\/code> \u53ea\u8bfb,\u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u8868\u793a\u6d4f\u89c8\u5668\u7684\u7248\u672c\u3002\u4e0d\u8981\u6307\u671b\u8be5\u5c5e\u6027\u8fd4\u56de\u6b63\u786e\u7684\u503c\u3002<\/li>\n<li><code>navigator.platform<\/code> \u53ea\u8bfb,\u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u8868\u793a\u6d4f\u89c8\u5668\u7684\u6240\u5728\u7cfb\u7edf\u5e73\u53f0\u3002<\/li>\n<li><code>navigator.product<\/code> \u53ea\u8bfb,\u8fd4\u56de\u5f53\u524d\u6d4f\u89c8\u5668\u7684\u4ea7\u54c1\u540d\u79f0\uff08\u5982\uff0c&#8221;Gecko&#8221;\uff09\u3002<\/li>\n<li><code>navigator.userAgent<\/code> \u53ea\u8bfb,\u8fd4\u56de\u5f53\u524d\u6d4f\u89c8\u5668\u7684\u7528\u6237\u4ee3\u7406\u5b57\u7b26\u4e32\uff08user agent string\uff09<\/li>\n<\/ul>\n<p>\u5982\u4e0b\u5728\u4e0d\u540c\u6d4f\u89c8\u5668\u6253\u5370\u7684\u4fe1\u606f<\/p>\n<pre><code class=\"hljs navigator.userAgent copyable\" lang=\"navigator.userAgent\">\/*\nchrome:\n    Mozilla\/5.0\n    (Macintosh; Intel Mac OS X 10_12_6)\n    AppleWebKit\/537.36 (KHTML, like Gecko)\n    Chrome\/61.0.3163.91 Safari\/537.36\nsafari:\n    Mozilla\/5.0\n    (Macintosh; Intel Mac OS X 10_12_6)\n    AppleWebKit\/604.1.38 (KHTML, like Gecko) Version\/11.0\n    Safari\/604.1.38\nios11\u5218\u6d77X:\n    Mozilla\/5.0\n    (iPhone; CPU iPhone OS 11_0 like Mac OS X)\n    AppleWebKit\/604.1.38 (KHTML, like Gecko)\n    Version\/11.0 Mobile\/15A372 Safari\/604.1\nipad\uff1a\n    Mozilla\/5.0\n    (iPad; CPU OS 9_1 like Mac OS X)\n    AppleWebKit\/601.1.46 (KHTML, like Gecko)\n    Version\/9.0 Mobile\/13B143 Safari\/601.1\ngalxy sansum:\n    Mozilla\/5.0\n    (Linux; Android 5.0; SM-G900P Build\/LRX21T)\n    AppleWebKit\/537.36 (KHTML, like Gecko)\n    Chrome\/61.0.3163.91 Mobile Safari\/537.36\n\u5b89\u88c5uc\u6d4f\u89c8\u5668\uff1a\n    Mozilla\/5.0\n    (Linux; U; Android 6.0.1; zh-CN; Mi Note 2 Build\/MXB48T)\n    AppleWebKit\/537.36 (KHTML, like Gecko) Version\/4.0\n    Chrome\/40.0.2214.89 UCBrowser\/11.4.9.941 Mobile Safari\/537.36\nwinphone:\n    Mozilla\/5.0\n    (Linux; Android 5.1.1; Nexus 6 Build\/LYZ28E)\n    AppleWebKit\/537.36 (KHTML, like Gecko) \n    Chrome\/61.0.3163.91 Mobile Safari\/537.36\nhybrid\u65b9\u6cd5\u7684\u53ef\u80fd\uff1a\n    Mozilla\/5.0\n    (iPhone; CPU iPhone OS 11_0 like Mac OS X)\n    AppleWebKit\/604.1.38 (KHTML, like Gecko)\n    Mobile\/15A372 weibo\/80011134\n*\/\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h2 class=\"heading\" data-id=\"heading-63\"><span id=\"14\">\u5341\u56db\u3001ajax\u4e0efetch<\/span><\/h2>\n<h3 class=\"heading\" data-id=\"heading-64\">ajax<\/h3>\n<ul>\n<li>ajax\u5168\u79f0Asynchronous JavaScript And XML\u4e5f\u5c31\u662f\u5f02\u6b65js\u4e0exml\uff0c\u5b83\u53ef\u4ee5\u8ba9\u9875\u9762\u5728\u4e0d\u5237\u65b0\u7684\u60c5\u51b5\u4e0b\u53d1\u8d77\u8bf7\u6c42\u83b7\u53d6\u6570\u636e<\/li>\n<li>\u4f7f\u7528<code>window.XMLHttpRequest<\/code>\u6784\u9020\u5668\u5b9e\u4f8b\u5316\u4e00\u4e2a\u7f51\u7edc\u8bf7\u6c42\u5bf9\u8c61<code>const XHR = new XMLHttpRequest()<\/code><\/li>\n<li><code>XHR.open(method, url, [ async, [ user, [ password]]])<\/code>\u6b64\u65b9\u6cd5\u7528\u6765\u53d1\u9001\u4e00\u4e2a\u8bf7\u6c42\uff0cmethod\u4e3a\u8bf7\u6c42\u65b9\u6cd5\uff0curl\u4e3a\u8bf7\u6c42\u5730\u5740\uff0casync\u4e3aboolean\u503c\u9ed8\u8ba4\u4e3atrue\u5373\u4f7f\u7528\u5f02\u6b65\u8bf7\u6c42\uff0cuser\u548cpassword\u5728\u8bf7\u6c42\u9700\u8981\u7528\u6237\u548c\u5bc6\u7801\u7684\u65f6\u5019\u4f7f\u7528<\/li>\n<li><code>XHR.send(body)<\/code>\u53c2\u6570\u4e3a\u53d1\u751f\u8bf7\u6c42\u4e3b\u4f53\u5185\u5bb9\uff0c\u5176\u683c\u5f0f\u53ef\u4ee5\u4e3aFormData\u3001ArrayBuffer\u3001Document\u3001\u5e8f\u5217\u5316\u5b57\u7b26\u4e32\uff0c\u5728\u6536\u5230\u54cd\u5e94\u540e\uff0c\u54cd\u5e94\u7684\u6570\u636e\u4f1a\u81ea\u52a8\u586b\u5145XHR\u5bf9\u8c61\u7684\u5c5e\u6027<\/li>\n<li>\u5f53\u9700\u8981\u8bbe\u7f6e\u8bf7\u6c42\u5934\u65f6\u53ef\u4ee5\u8c03\u7528<code>XHR.setRequestHeader(header,value)<\/code>\u8bbe\u7f6e\u8bf7\u6c42\u5934\u7684\u7c7b\u578b\u4e0e\u503c\uff0c\u5f53\u4ee5post\u65b9\u5f0f\u53d1\u8d77\u8bf7\u6c42\u5c31\u7528\u8bbe\u7f6e<code>XHR.setRequestHeader('Content-Type', 'application\/x-www-form-urlencoded')<\/code>\u6b64\u8bf7\u6c42\u5934\uff0c\u503c\u53ef\u66f4\u6539<\/li>\n<li>\u901a\u8fc7\u76d1\u542c\u5b9e\u4f8b\u7684onreadystatechange\u5c5e\u6027\u65b9\u6cd5\uff0c\u5f53readyState\u7684\u503c\u6539\u53d8\u7684\u65f6\u5019\u4f1a\u89e6\u53d1onreadystatechange\u5bf9\u5e94\u7684\u56de\u8c03\u51fd\u6570<code>XHR.onreadystatechange = function () { }<\/code><\/li>\n<li>\u8bf7\u6c42\u72b6\u6001readyState\u67095\u4e2a\u503c\uff0c\u5bf9\u5e945\u4e2a\u8bf7\u6c42\u72b6\u6001\uff0c\u53ea\u8bfb\n<ul>\n<li>0 \u8868\u793a \u8bf7\u6c42\u8fd8\u672a\u521d\u59cb\u5316\uff0c\u5c1a\u672a\u8c03\u7528 open() \u65b9\u6cd5\u3002<\/li>\n<li>1 \u8868\u793a \u5df2\u5efa\u7acb\u670d\u52a1\u5668\u94fe\u63a5\uff0copen() \u65b9\u6cd5\u5df2\u7ecf\u88ab\u8c03\u7528\u3002<\/li>\n<li>2 \u8868\u793a \u8bf7\u6c42\u5df2\u63a5\u53d7\uff0csend() \u65b9\u6cd5\u5df2\u7ecf\u88ab\u8c03\u7528\uff0c\u5e76\u4e14\u5934\u90e8\u548c\u72b6\u6001\u5df2\u7ecf\u53ef\u83b7\u5f97\u3002<\/li>\n<li>3 \u8868\u793a \u6b63\u5728\u5904\u7406\u8bf7\u6c42\uff0c\u4e0b\u8f7d\u4e2d\uff1b responseText \u5c5e\u6027\u5df2\u7ecf\u5305\u542b\u90e8\u5206\u6570\u636e\u3002<\/li>\n<li>4 \u8868\u793a \u5b8c\u6210\uff0c\u4e0b\u8f7d\u64cd\u4f5c\u5df2\u5b8c\u6210\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u8fd8\u6709status\u5c5e\u6027\uff0c\u5b83\u662f\u8fd9\u6b21\u8bf7\u6c42\u4e2d\u7684\u54cd\u5e94\u6570\u5b57\u72b6\u6001\u7801\uff0c\u5373\u4e3a\u6211\u4eec\u5e73\u65f6\u770b\u5230\u76841xx\u30012xx\u30013xx\u30014xx\u30015xx\u8868\u793a\u6b64\u6b21\u8bf7\u6c42\u7684\u72b6\u6001\u7ed3\u679c\uff0c\u5728\u8fd8\u672a\u53d1\u8d77\u8bf7\u6c42\u548c\u51fa\u9519\u65f6\u90fd\u4e3a0\uff0c\u53ea\u8bfb<\/li>\n<li><code>XHR.responseText<\/code>\u5c5e\u6027\u4e3a\u6b64\u6b21\u54cd\u5e94\u7684\u6570\u636e\uff0c\u4e3a\u5b57\u7b26\u4e32\uff0c\u53ef\u80fd\u662fJSON\u683c\u5f0f\u9700\u8981JSON.parse\u89e3\u6790<\/li>\n<li><code>XHR.responseXML<\/code>\u5c5e\u6027\u4e3axml\u5f62\u5f0f\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u901a\u8fc7<code>XHR.responseType = 'document'<\/code>\u548c<code>XHR.overrideMimeType('text\/xml')<\/code>\u6765\u89e3\u6790\u4e3aXML<\/li>\n<li><code>XHR.withCredentials<\/code>\u5c5e\u6027\u8bbe\u7f6e\u4e3aboolean\u503c\uff0c\u901a\u8fc7\u6b64\u5c5e\u6027\u6765\u8bbe\u7f6e\u662f\u5426\u4f7f\u7528cookies\u3001authorization\u7b49\u51ed\u8bc1\u5b57\u6bb5<\/li>\n<li><code>XHR.timeout<\/code>\u901a\u8fc7\u6b64\u5c5e\u6027\u6765\u8bbe\u7f6e\u8bf7\u6c42\u8d85\u65f6\u65f6\u95f4<\/li>\n<li><code>XHR.ontimeout<\/code>\u901a\u8fc7\u6b64\u5c5e\u6027\u6765\u8bbe\u7f6e\u8bf7\u6c42\u8d85\u65f6\u7684\u56de\u8c03\u51fd\u6570,\u51fd\u6570\u7684\u53c2\u6570\u4e3a\u4e8b\u4ef6\u5bf9\u8c61<\/li>\n<li><code>XHR.abort()<\/code>\u6b64\u65b9\u6cd5\u7528\u6765\u7ec8\u6b62\u7f51\u7edc\u8bf7\u6c42<\/li>\n<li><code>XHR.getAllResponseHeaders()<\/code>\u6b64\u65b9\u6cd5\u7528\u6765\u83b7\u53d6\u6240\u6709\u7684\u54cd\u5e94\u5934<\/li>\n<li><code>XHR.getResponseHeader(name)<\/code>\u6b64\u65b9\u6cd5\u7528\u6765\u83b7\u53d6\u6307\u5b9a\u7684\u54cd\u5e94\u5934<\/li>\n<li>\u8fd8\u67096\u4e2a\u5173\u4e8e\u8fdb\u5ea6\u7684\u4e8b\u4ef6\n<ul>\n<li>loadstart \u5728\u6536\u5230\u54cd\u5e94\u7684\u7b2c\u4e00\u4e2a\u5b57\u8282\u89e6\u53d1<\/li>\n<li>progress \u5728\u63a5\u6536\u671f\u95f4\u4e0d\u65ad\u89e6\u53d1<\/li>\n<li>error \u53d1\u751f\u9519\u8bef<\/li>\n<li>abort \u8c03\u7528abort\u65b9\u6cd5\u800c\u7ec8\u6b62<\/li>\n<li>load \u63a5\u6536\u5230\u5b8c\u6574\u6570\u636e\uff0c\u53ef\u4ee3\u66ffreadystatechange\u4e0ereadyState\u5224\u65ad<\/li>\n<li>loadend \u5728\u901a\u4fe1\u5b8c\u6210\u6216abort error load\u4e8b\u4ef6\u540e\u89e6\u53d1<\/li>\n<\/ul>\n<\/li>\n<li>\u901a\u8fc7<code>XHR.addEventListener(eventname,callback)<\/code>\u65b9\u6cd5\u6dfb\u52a0\u5bf9\u5e94\u7684\u4e8b\u4ef6\u76d1\u542c\uff0c\u5176\u56de\u8c03\u51fd\u6570\u63a5\u6536\u4e00\u4e2a\u4e8b\u4ef6\u5bf9\u8c61\u53c2\u6570<\/li>\n<li>progress\u4e8b\u4ef6\u5bf9\u8c61\u67093\u4e2a\u5c5e\u6027\u7528\u4e8e\u67e5\u770b\u5f53\u524d\u8fdb\u5ea6\u76f8\u5173\u4fe1\u606f\uff0clengthComputable\u4e3aboolean\u503c\uff0c\u8868\u793a\u8fdb\u5ea6\u662f\u5426\u53ef\u7528\uff0cposition\u8868\u793a\u5df2\u7ecf\u63a5\u6536\u7684\u5b57\u8282\u6570\uff0ctotalSize\u8868\u793a\u603b\u9700\u8981\u4f20\u8f93\u7684\u5185\u5bb9\u957f\u5ea6\u5373Content-Length\u5b57\u8282\u6570\uff0c\u901a\u5e38\u5728\u5206\u7247\u4f20\u8f93\u5185\u5bb9\u7684\u65f6\u5019\u7528\u5230<\/li>\n<\/ul>\n<p>\u7b80\u5355\u7684\u53d1\u8d77\u4e00\u6b21\u8bf7\u6c42<\/p>\n<pre><code class=\"hljs \u7b80\u5355\u4f7f\u7528 copyable\" lang=\"\u7b80\u5355\u4f7f\u7528\">\/\/ \u6700\u7b80\u5355\u7684\u53d1\u8d77\u4e00\u4e2a\u8bf7\u6c42\nconst XHR = new XMLHttpRequest()\nXHR.open('get','http:\/\/127.0.0.1:3000\/test?key=value')\nXHR.send()\nXHR.addEventListener('load',(e)=&gt;{\n  \/\/ \u670d\u52a1\u7aef\u8fd4\u56de\u7684\u662f\u67e5\u8be2\u53c2\u6570\n  console.log(XHR.response) \/\/ {\"key\":\"value\"}\n})\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p>\u57fa\u4e8eXMLHttpRequest\u5c01\u88c5\u4e00\u4e2a\u8bf7\u6c42\u65b9\u6cd5<\/p>\n<pre><code class=\"hljs \u5c01\u88c5\u7f51\u7edc\u8bf7\u6c42 copyable\" lang=\"\u5c01\u88c5\u7f51\u7edc\u8bf7\u6c42\">\/\/ \u53d1\u9001\u7684\u6570\u636e\nconst data = {\n  name: 'tom'\n}\n\/\/ \u8bf7\u6c42\u914d\u7f6e\nconst config = {\n  type: \"post\",\n  url: \"http:\/\/127.0.0.1:3000\/test\",\n  data: data,\n  dataType: 'application\/json',\n  success: function (res) {\n    console.log(res);\n  },\n  error: function (e) {\n    console.log(e);\n  }\n}\n\/\/ \u8bf7\u6c42\u6784\u9020\u5668\nfunction Ajax(conf) {\n  this.type = conf.type || 'get'\n  this.url = conf.url || ''\n  this.data = conf.data || {}\n  this.dataType = conf.dataType || ''\n  this.success = conf.success || null\n  this.error = conf.error || null\n}\n\/\/ send\u65b9\u6cd5\nAjax.prototype.send = function () {\n  if (this.url === '') return\n  const XHR = new XMLHttpRequest()\n  XHR.addEventListener('load', () =&gt; {\n    if (XHR.status &gt;= 200 &amp;&amp; XHR.status &lt; 300 || XHR.status == 304) {\n      typeof this.success === 'function' &amp;&amp; this.success(XHR.response)\n    }\n  })\n  XHR.addEventListener('error', (e) =&gt; {\n    typeof this.error === 'function' &amp;&amp; this.error(e)\n  })\n  if (this.type.toLowerCase() === 'get') {\n    XHR.open('get', this.url)\n    XHR.send(null)\n  } else {\n    XHR.open(this.type, this.url)\n    XHR.setRequestHeader('Content-Type', this.dataType || 'application\/x-www-form-urlencoded')\n    let data = this.data\n    if (this.dataType === 'application\/json') {\n      data = JSON.stringify(this.data)\n    }\n    XHR.send(data)\n  }\n}\n\/\/ \u53d1\u9001\u8bf7\u6c42\nconst ajax = new Ajax(config).send()\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p>\u7531\u4e8e\u7f51\u7edc\u8bf7\u6c42\u6a21\u5757\u5c01\u88c5\u8f83\u7e41\u7410\uff0c\u8fd9\u91cc\u5c31\u7b80\u5355\u5c01\u88c5\u4e86\u4e00\u4e0b\uff0c\u4ec5\u4f9b\u53c2\u8003\uff08\u3002\uff3e\u25bd\uff3e\uff09<\/p>\n<h3 class=\"heading\" data-id=\"heading-65\">fetch<\/h3>\n<ul>\n<li>fetch API\u63d0\u4f9b\u4e86js\u63a5\u53e3\uff0c\u7528\u4e8e\u66ff\u4ee3XMLHttpRequest\u65b9\u5f0f\u7684\u7f51\u7edc\u8bf7\u6c42\uff0cfetch()\u5168\u5c40\u65b9\u6cd5\u4f7f\u7528\u8d77\u6765\u6bd4XHR\u66f4\u52a0\u65b9\u4fbf<\/li>\n<li>fetch\u65b9\u6cd5\u63a5\u53d72\u4e2a\u53c2\u6570\uff0c\u53c2\u65701\u4e3a\u8bf7\u6c42url\u6216 Request \u5bf9\u8c61\uff0c\u53c2\u65702\u4e3a\u53ef\u9009\u914d\u7f6e\u5bf9\u8c61<\/li>\n<\/ul>\n<pre><code class=\"hljs fetch copyable\" lang=\"fetch\">\/\/ fetch\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2aPromise\u5bf9\u8c61\uff0c\u53ef\u7528then\u65b9\u6cd5\u63a5\u6536\u7ed3\u679c\uff0c\u7528catch\u65b9\u6cd5\u6355\u83b7\u5f02\u5e38\uff0c\u540cPromise\u4f7f\u7528\n\/\/ \u914d\u7f6e\u5bf9\u8c61\u5177\u4f53\u914d\u7f6e\nconst config = {\n  method: 'GET',      \/\/ \u8bf7\u6c42\u65b9\u6cd5\n  headers: {          \/\/ \u5934\u4fe1\u606f\n    'user-agent': 'Mozilla\/4.0 MDN Example',\n    'content-type': 'application\/json'\n  },\n  body: JSON.stringify({  \/\/ \u8bf7\u6c42\u7684 body \u4fe1\u606f\uff0cBlob, FormData \u7b49\n    data: 1\n  }),\n  mode: 'cors',             \/\/ \u8bf7\u6c42\u7684\u6a21\u5f0f\uff0ccors\u3001 no-cors \u6216 same-origin\n  credentials: 'include',   \/\/ omit\u3001same-origin \u6216 include\u3002\u4e3a\u4e86\u5728\u5f53\u524d\u57df\u540d\u5185\u81ea\u52a8\u53d1\u9001 cookie, \u5fc5\u987b\u63d0\u4f9b\u8fd9\u4e2a\u9009\u9879\n  cache: 'no-cache',        \/\/ default \u3001 no-store \u3001 reload \u3001 no-cache \u3001 force-cache \u6216\u8005 only-if-cached\n  redirect: 'follow',       \/\/ \u53ef\u7528\u7684 redirect \u6a21\u5f0f: follow (\u81ea\u52a8\u91cd\u5b9a\u5411), error (\u5982\u679c\u4ea7\u751f\u91cd\u5b9a\u5411\u5c06\u81ea\u52a8\u7ec8\u6b62\u5e76\u4e14\u629b\u51fa\u4e00\u4e2a\u9519\u8bef), \u6216\u8005 manual (\u624b\u52a8\u5904\u7406\u91cd\u5b9a\u5411).\n  referrer: 'no-referrer',  \/\/ no-referrer\u3001client\u6216\u4e00\u4e2a URL\u3002\u9ed8\u8ba4\u662f client\u3002\n  referrerPolicy: 'no-referrer', \/\/ \u6307\u5b9a referer HTTP\u5934\n  integrity: 'sha256-BpfBw7ivV8q2jLiT13fxDYAe2tJllusRSZ273h2nFSE=', \/\/ \u5305\u62ec\u8bf7\u6c42\u7684  subresource integrity \u503c\n}\n\/\/ \u53d1\u8d77\u8bf7\u6c42\nfetch('http:\/\/biadu.com' [, config])\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li>\n<p>then\u7684\u56de\u8c03\u51fd\u6570\u63a5\u53d7\u4e00\u4e2aResponse\u5bf9\u8c61\u53c2\u6570\uff0c\u5176\u5bf9\u8c61\u62e5\u67099\u4e2a\u5c5e\u6027\uff0c8\u4e2a\u65b9\u6cd5<\/p>\n<\/li>\n<li>\n<p>9\u4e2a\u5c5e\u6027<\/p>\n<ul>\n<li>type \u53ea\u8bfb \u5305\u542bResponse\u7684\u7c7b\u578b (\u4f8b\u5982, basic, cors)<\/li>\n<li>url \u53ea\u8bfb \u5305\u542bResponse\u7684URL<\/li>\n<li>useFinalURL \u5305\u542b\u4e86\u4e00\u4e2a\u5e03\u5c14\u503c\u6765\u6807\u793a\u8fd9\u662f\u5426\u662f\u8be5Response\u7684\u6700\u7ec8URL<\/li>\n<li>status \u53ea\u8bfb \u5305\u542bResponse\u7684\u72b6\u6001\u7801<\/li>\n<li>ok \u53ea\u8bfb \u5305\u542b\u4e86\u4e00\u4e2a\u5e03\u5c14\u503c\u6765\u6807\u793a\u8be5Response\u6210\u529f(\u72b6\u6001\u7801200-299)<\/li>\n<li>redirected \u53ea\u8bfb \u8868\u793a\u8be5Response\u662f\u5426\u6765\u81ea\u4e00\u4e2a\u91cd\u5b9a\u5411\uff0c\u5982\u679c\u662f\u7684\u8bdd\uff0c\u5b83\u7684URL\u5217\u8868\u5c06\u4f1a\u6709\u591a\u4e2a<\/li>\n<li>statusText \u53ea\u8bfb \u5305\u542b\u4e86\u4e0e\u8be5Response\u72b6\u6001\u7801\u4e00\u81f4\u7684\u72b6\u6001\u4fe1\u606f<\/li>\n<li>headers \u53ea\u8bfb \u5305\u542b\u6b64Response\u6240\u5173\u8054\u7684Headers \u5bf9\u8c61<\/li>\n<li>bodyUsed Body \u53ea\u8bfb \u5305\u542b\u4e86\u4e00\u4e2a\u5e03\u5c14\u503c\u6765\u6807\u793a\u8be5Response\u662f\u5426\u8bfb\u53d6\u8fc7Body<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>8\u4e2a\u65b9\u6cd5<\/p>\n<ul>\n<li>clone \u521b\u5efa\u4e00\u4e2aResponse\u5bf9\u8c61\u7684\u514b\u9686<\/li>\n<li>error \u8fd4\u56de\u4e00\u4e2a\u7ed1\u5b9a\u4e86\u7f51\u7edc\u9519\u8bef\u7684\u65b0\u7684Response\u5bf9\u8c61<\/li>\n<li>redirect(url, status) \u7528\u53e6\u4e00\u4e2aURL\u521b\u5efa\u4e00\u4e2a\u65b0\u7684 response<\/li>\n<li>arrayBuffer \u63a5\u53d7\u4e00\u4e2a Response \u6d41, \u5e76\u7b49\u5f85\u5176\u8bfb\u53d6\u5b8c\u6210. \u5e76 resolve \u4e00\u4e2a ArrayBuffer \u5bf9\u8c61<\/li>\n<li>blob  blob()\u65b9\u6cd5\u4f7f\u7528\u4e00\u4e2a Response \u6d41\uff0c\u5e76\u5c06\u5176\u8bfb\u53d6\u5b8c\u6210<\/li>\n<li>formData \u5c06 Response \u5bf9\u8c61\u4e2d\u7684\u6240\u627f\u8f7d\u7684\u6570\u636e\u6d41\u8bfb\u53d6\u5e76\u5c01\u88c5\u6210\u4e3a\u4e00\u4e2a\u5bf9\u8c61<\/li>\n<li>json \u4f7f\u7528\u4e00\u4e2a Response \u6d41\uff0c\u5e76\u5c06\u5176\u8bfb\u53d6\u5b8c\u6210\u3002\u89e3\u6790\u7ed3\u679c\u662f\u5c06\u6587\u672c\u4f53\u89e3\u6790\u4e3a JSON<\/li>\n<li>text \u63d0\u4f9b\u4e86\u4e00\u4e2a\u53ef\u4f9b\u8bfb\u53d6\u7684&#8221;\u8fd4\u56de\u6d41&#8221;, \u5b83\u8fd4\u56de\u4e00\u4e2a\u5305\u542bUSVString\u5bf9\u8c61\uff0c\u7f16\u7801\u4e3aUTF-8<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 class=\"heading\" data-id=\"heading-66\"><span id=\"15\">\u5341\u4e94\u3001WebSocket<\/span><\/h2>\n<ul>\n<li>WebSocket\u662f\u4e00\u79cd\u5728\u5355\u4e2aTCP\u8fde\u63a5\u4e0a\u8fdb\u884c\u5168\u53cc\u5de5\u901a\u4fe1\u7684\u534f\u8bae\uff0c\u5373\u8fde\u63a5\u53cc\u65b9\u53ef\u4ee5\u540c\u65f6\u5b9e\u65f6\u6536\u53d1\u6570\u636e\uff0c\u5b83\u53ef\u4ee5\u5728\u7528\u6237\u7684\u6d4f\u89c8\u5668\u548c\u670d\u52a1\u5668\u4e4b\u95f4\u6253\u5f00\u53cc\u5de5\u3001\u53cc\u5411\u901a\u8baf\u4f1a\u8bdd\u3002<\/li>\n<li>WebSocket API\u63d0\u4f9b\u5168\u5c40\u65b9\u6cd5<code>WebSocket(url[, protocols])<\/code>\u521b\u5efa\u5b9e\u4f8b,\u53c2\u65701 \u5bf9\u65b9\u7edd\u5bf9url\u5176url\u4ee5<code>ws:\/\/<\/code>\u6216\u8005<code>wss:\/\/(\u52a0\u5bc6)<\/code>\u5f00\u5934\uff0c\u53c2\u65702 protocols\u662f\u5355\u534f\u8bae\u6216\u8005\u5305\u542b\u534f\u8bae\u7684\u5b57\u7b26\u4e32\u6570\u7ec4<\/li>\n<\/ul>\n<pre><code class=\"hljs websocket copyable\" lang=\"websocket\">\/\/ \u5fc5\u987b\u4f20\u5165\u7edd\u5bf9URL\uff0c\u53ef\u4ee5\u662f\u4efb\u4f55\u7f51\u7ad9\nconst s = new WebSocket('ws:\/\/www.baidu.com') \ns.readyState    \/\/ 0 \u5efa\u7acb\u8fde\u63a5 1 \u5df2\u7ecf\u5efa\u7acb 2 \u6b63\u5728\u5173\u95ed 3 \u8fde\u63a5\u5df2\u5173\u95ed\u6216\u8005\u6ca1\u6709\u94fe\u63a5\u6210\u529f\ns.send('hello') \/\/ \u53d1\u9001\u7684\u6570\u636e\u5fc5\u987b\u662f\u7eaf\u6587\u672c\ns.onopen = function () {}\ns.onerror = function () {}\ns.onmessage = function (event) {\n  \/\/ \u5f53\u63a5\u6536\u5230\u6d88\u606f\u65f6\n  console.log(event.data) \/\/ \u6570\u636e\u662f\u7eaf\u5b57\u7b26\n}\ns.close()   \/\/ \u5173\u95ed\u8fde\u63a5\ns.onclose = function (event) {\n  \/*\n    * event.wasClean \u662f\u5426\u660e\u786e\u7684\u5173\u95ed \n    * event.code \u670d\u52a1\u5668\u8fd4\u56de\u7684\u6570\u503c\u72b6\u6001\u7801\n    * event.reason \u5b57\u7b26\u4e32\uff0c\u670d\u52a1\u5668\u8fd4\u56de\u7684\u6d88\u606f\n    *\/\n}\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li>10\u4e2a\u5c5e\u6027\n<ul>\n<li>binaryType \u8fd4\u56dewebsocket\u8fde\u63a5\u6240\u4f20\u8f93\u4e8c\u8fdb\u5236\u6570\u636e\u7684\u7c7b\u578b\uff08blob, arraybuffer\uff09<\/li>\n<li>bufferedAmount \u53ea\u8bfb \u8fd4\u56de\u5df2\u7ecf\u88absend()\u65b9\u6cd5\u653e\u5165\u961f\u5217\u4e2d\u4f46\u8fd8\u6ca1\u6709\u88ab\u53d1\u9001\u5230\u7f51\u7edc\u4e2d\u7684\u6570\u636e\u7684\u5b57\u8282\u6570\u3002\u4e00\u65e6\u961f\u5217\u4e2d\u7684\u6240\u6709\u6570\u636e\u88ab\u53d1\u9001\u81f3\u7f51\u7edc\uff0c\u5219\u8be5\u5c5e\u6027\u503c\u5c06\u88ab\u91cd\u7f6e\u4e3a0\u3002\u4f46\u662f\uff0c\u82e5\u5728\u53d1\u9001\u8fc7\u7a0b\u4e2d\u8fde\u63a5\u88ab\u5173\u95ed\uff0c\u5219\u5c5e\u6027\u503c\u4e0d\u4f1a\u91cd\u7f6e\u4e3a0\u3002<\/li>\n<li>extensions \u53ea\u8bfb \u8fd4\u56de\u670d\u52a1\u5668\u9009\u62e9\u7684\u6269\u5c55\u540d\u3002\u8fd9\u5f53\u524d\u53ea\u662f\u7a7a\u5b57\u7b26\u4e32\u6216\u8fde\u63a5\u534f\u5546\u7684\u6269\u5c55\u5217\u8868<\/li>\n<li>onclose \u7528\u4e8e\u6307\u5b9a\u8fde\u63a5\u5931\u8d25\u540e\u7684\u56de\u8c03\u51fd\u6570<\/li>\n<li>onmessage \u7528\u4e8e\u6307\u5b9a\u5f53\u4ece\u670d\u52a1\u5668\u63a5\u53d7\u5230\u4fe1\u606f\u65f6\u7684\u56de\u8c03\u51fd\u6570<\/li>\n<li>onopen \u7528\u4e8e\u6307\u5b9a\u8fde\u63a5\u6210\u529f\u540e\u7684\u56de\u8c03\u51fd\u6570<\/li>\n<li>protocol \u53ea\u8bfb \u670d\u52a1\u5668\u9009\u62e9\u7684\u4e0b\u5c5e\u534f\u8bae<\/li>\n<li>readyState \u53ea\u8bfb \u5f53\u524d\u7684\u94fe\u63a5\u72b6\u6001\uff0c\u51714\u4e2a\n<ul>\n<li>0 \u5efa\u7acb\u8fde\u63a5<\/li>\n<li>1 \u5df2\u7ecf\u8fde\u63a5<\/li>\n<li>2 \u6b63\u5728\u5173\u95ed<\/li>\n<li>3 \u8fde\u63a5\u5df2\u7ecf\u5173\u95ed\u6216\u8005\u6ca1\u6709\u8fde\u63a5\u6210\u529f<\/li>\n<\/ul>\n<\/li>\n<li>url \u53ea\u8bfb WebSocket \u7684\u7edd\u5bf9\u8def\u5f84<\/li>\n<\/ul>\n<\/li>\n<li>2\u4e2a\u65b9\u6cd5\n<ul>\n<li>close(code, reason) \u6570\u5b57\u72b6\u6001\u7801 \u53ef\u9009 \u9ed8\u8ba4 1005\u548c\u4e00\u4e2a\u53ef\u9009\u7684\u7c7b\u53ef\u8bfb\u7684\u5b57\u7b26\u4e32\uff0c\u5b83\u89e3\u91ca\u4e86\u8fde\u63a5\u5173\u95ed\u7684\u539f\u56e0\u3002<\/li>\n<li>send(data) \u5411\u670d\u52a1\u5668\u53d1\u9001\u6570\u636e\uff08ArrayBuffer\uff0cBlob\u7b49\uff09<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 class=\"heading\" data-id=\"heading-67\"><span id=\"16\">\u5341\u516d\u3001\u77ed\u8f6e\u8be2\u3001\u957f\u8f6e\u8be2\u4e0eWebSocket<\/span><\/h2>\n<h3 class=\"heading\" data-id=\"heading-68\">\u77ed\u8f6e\u8be2<\/h3>\n<ul>\n<li>http \u77ed\u8f6e\u8be2\u662fserver\u6536\u5230\u8bf7\u6c42\u4e0d\u7ba1\u662f\u5426\u6709\u6570\u636e\u5230\u8fbe\u90fd\u76f4\u63a5\u54cd\u5e94http\u8bf7\u6c42\uff0c\u670d\u52a1\u7aef\u54cd\u5e94\u5b8c\u6210\uff0c\u5c31\u4f1a\u5173\u95ed\u8fd9\u4e2aTCP\u8fde\u63a5\uff1b\u5982\u679c\u6d4f\u89c8\u5668\u6536\u5230\u7684\u6570\u636e\u4e3a\u7a7a\uff0c\u5219\u9694\u4e00\u6bb5\u65f6\u95f4\uff0c\u6d4f\u89c8\u5668\u53c8\u4f1a\u53d1\u9001\u76f8\u540c\u7684http\u8bf7\u6c42\u5230server\u4ee5\u83b7\u53d6\u6570\u636e\u54cd\u5e94<\/li>\n<li>\u7f3a\u70b9\uff1a\u6d88\u606f\u4ea4\u4e92\u7684\u5b9e\u65f6\u6027\u8f83\u4f4e\uff08server\u7aef\u5230\u6d4f\u89c8\u5668\u7aef\u7684\u6570\u636e\u53cd\u9988\u6548\u7387\u4f4e\uff09<\/li>\n<\/ul>\n<p>\u7b80\u5355\u6f14\u793a<\/p>\n<pre><code class=\"hljs \u77ed\u8f6e\u8be2 copyable\" lang=\"\u77ed\u8f6e\u8be2\">const xhr = new XMLHttpRequest()\n\/\/ \u6bcf\u79d2\u53d1\u9001\u4e00\u6b21\u77ed\u8f6e\u8be2\nconst id = setInterval(() =&gt; {\n  xhr.open('GET', 'http:\/\/127.0.0.1:3000\/test?key=value')\n  xhr.addEventListener('load', (e) =&gt; {\n    if (xhr.status == 200) {\n      \/\/ \u5904\u7406\u6570\u636e\n      console.log(xhr.response)\n      \/\/ \u5982\u679c\u4e0d\u9700\u8981\u53ef\u4ee5\u5173\u95ed\n      clearInterval(id)\n    }\n  })\n  xhr.send()\n}, 1000)\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h3 class=\"heading\" data-id=\"heading-69\">\u957f\u8f6e\u8be2<\/h3>\n<ul>\n<li>http \u957f\u8f6e\u8be2\u662fserver\u6536\u5230\u8bf7\u6c42\u540e\u5982\u679c\u6709\u6570\u636e\uff0c\u7acb\u523b\u54cd\u5e94\u8bf7\u6c42\uff1b\u5982\u679c\u6ca1\u6709\u6570\u636e\u5c31\u4f1a\u505c\u7559\u4e00\u6bb5\u65f6\u95f4\uff0c\u8fd9\u6bb5\u65f6\u95f4\u5185\uff0c\u5982\u679cserver\u8bf7\u6c42\u7684\u6570\u636e\u5230\u8fbe\uff08\u5982\u67e5\u8be2\u6570\u636e\u5e93\u6216\u6570\u636e\u7684\u903b\u8f91\u5904\u7406\u5b8c\u6210\uff09\uff0c\u5c31\u4f1a\u7acb\u523b\u54cd\u5e94\uff1b\u5982\u679c\u8fd9\u6bb5\u65f6\u95f4\u8fc7\u540e\uff0c\u8fd8\u6ca1\u6709\u6570\u636e\u5230\u8fbe\uff0c\u5219\u4ee5\u7a7a\u6570\u636e\u7684\u5f62\u5f0f\u54cd\u5e94http\u8bf7\u6c42\uff1b\u82e5\u6d4f\u89c8\u5668\u6536\u5230\u7684\u6570\u636e\u4e3a\u7a7a\uff0c\u4f1a\u518d\u6b21\u53d1\u9001\u540c\u6837\u7684http\u8bf7\u6c42\u5230server<\/li>\n<li>\u7f3a\u70b9\uff1aserver \u6ca1\u6709\u6570\u636e\u5230\u8fbe\u65f6\uff0chttp\u8fde\u63a5\u4f1a\u505c\u7559\u4e00\u6bb5\u65f6\u95f4\uff0c\u8fd9\u4f1a\u9020\u6210\u670d\u52a1\u5668\u8d44\u6e90\u6d6a\u8d39<\/li>\n<\/ul>\n<p>\u7b80\u5355\u6f14\u793a<\/p>\n<pre><code class=\"hljs \u957f\u8f6e\u8be2 copyable\" lang=\"\u957f\u8f6e\u8be2\">function ajax() {\n  const xhr = new XMLHttpRequest();\n  xhr.open('GET', 'http:\/\/127.0.0.1:3000\/test?key=value');\n  xhr.addEventListener('load', (e) =&gt; {\n    if (xhr.status == 200) {\n      \/\/ \u5904\u7406\u6570\u636e\n      console.log(xhr.response)\n      \/\/ \u5982\u679c\u4e0d\u9700\u8981\u53ef\u4ee5\u5173\u95ed\n      if (xhr.response != '') return\n      ajax()\n    }\n  })\n  xhr.send();\n}\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h3 class=\"heading\" data-id=\"heading-70\">\u76f8\u540c\u70b9<\/h3>\n<ul>\n<li>\u5f53server\u7684\u6570\u636e\u4e0d\u53ef\u8fbe\u65f6\uff0c\u57fa\u4e8ehttp\u957f\u8f6e\u8be2\u548c\u77ed\u8f6e\u8be2\u7684http\u8bf7\u6c42\uff0c\u90fd\u4f1a\u505c\u7559\u4e00\u6bb5\u65f6\u95f4<\/li>\n<li>\u90fd\u662f\u7528\u4e8e\u5b9e\u65f6\u4ece\u670d\u52a1\u5668\u83b7\u53d6\u6570\u636e\u66f4\u65b0<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-71\">\u4e0d\u540c\u70b9<\/h3>\n<ul>\n<li>http\u957f\u8f6e\u8be2\u662f\u5728\u670d\u52a1\u5668\u7aef\u7684\u505c\u7559\uff0c\u800chttp\u77ed\u8f6e\u8be2\u662f\u5728\u6d4f\u89c8\u5668\u7aef\u7684\u505c\u7559<\/li>\n<li>\u77ed\u8f6e\u8be2\u9694\u4e00\u6bb5\u65f6\u95f4\u5411\u670d\u52a1\u5668\u53d1\u8d77\u8bf7\u6c42\uff0c\u4e0d\u7ba1\u670d\u52a1\u5668\u6570\u636e\u6709\u6ca1\u6709\u53d8\u5316\u90fd\u76f4\u63a5\u8fd4\u56de\u7ed3\u679c\uff0c\u957f\u8f6e\u8be2\u5219\u5728\u670d\u52a1\u5668\u6570\u636e\u6709\u53d1\u751f\u53d8\u5316\u7684\u65f6\u5019\u624d\u8fd4\u56de\u7ed3\u679c\uff0c\u5982\u679c\u5728\u4e00\u5b9a\u65f6\u95f4\u6ca1\u6709\u53d8\u5316\u90a3\u4e48\u5c06\u4f1a\u8d85\u65f6\u81ea\u52a8\u5173\u95ed\u8fde\u63a5<\/li>\n<\/ul>\n<p><\/p><figure><img decoding=\"async\" alt=\"\u8f6e\u8be2\u5bf9\u6bd4\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d557898dae06?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"938\" data-height=\"789\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;938&quot; height=&quot;789&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<h3 class=\"heading\" data-id=\"heading-72\">Web Socket<\/h3>\n<ul>\n<li>\u4e3a\u4e86\u89e3\u51b3http\u65e0\u72b6\u6001\uff0c\u88ab\u52a8\u6027\uff0c\u4ee5\u53ca\u8f6e\u8be2\u95ee\u9898\uff0chtml5\u65b0\u63a8\u51fa\u4e86websocket\u534f\u8bae\uff0c\u6d4f\u89c8\u5668\u548c\u670d\u52a1\u5668\u53ea\u9700\u5b8c\u6210\u4e00\u6b21\u63e1\u624b\uff0c\u4e24\u8005\u5373\u53ef\u5efa\u7acb\u6301\u4e45\u6027\u8fde\u63a5\uff0c\u5e76\u8fdb\u884c\u53cc\u5411\u901a\u4fe1<\/li>\n<li>\u57fa\u4e8ehttp\u8fdb\u884c\u63e1\u624b\uff0c\u53d1\u751f\u52a0\u5bc6\u6570\u636e\uff0c\u4fdd\u6301\u8fde\u63a5\u4e0d\u65ad\u5f00<\/li>\n<li>\u4f18\u70b9\uff1a\n<ul>\n<li>\u8f83\u5c11\u7684\u63a7\u5236\u5f00\u9500\uff0c\u5728\u8fdb\u884c\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u7684\u6570\u636e\u4ea4\u6362\u65f6\uff0c\u7528\u4e8e\u534f\u8bae\u63a7\u5236\u7684\u6570\u636e\u5305\u5934\u8f83\u5c0f<\/li>\n<li>\u66f4\u5f3a\u7684\u5b9e\u65f6\u6027\uff0c\u5168\u53cc\u5de5\u901a\u4fe1\uff0c\u4e0d\u5fc5\u5c40\u9650\u4e8e\u4e00\u65b9\u53d1\u8d77\u7684\u8bf7\u6c42\uff0c\u670d\u52a1\u5668\u4e0e\u5ba2\u6237\u7aef\u53ef\u4ee5\u968f\u65f6\u53d1\u9001\u6570\u636e\uff0c\u5ef6\u8fdf\u66f4\u5c11<\/li>\n<li>\u6709\u72b6\u6001\u7684\u8fde\u63a5\uff0cwebsocket\u5728\u901a\u4fe1\u4e4b\u524d\u9700\u8981\u53cc\u65b9\u5efa\u7acb\u8fde\u63a5\uff0c\u624d\u80fd\u8fdb\u884c\u901a\u4fe1\uff0c\u800chttp\u534f\u8bae\u5728\u6bcf\u6b21\u8bf7\u6c42\u90fd\u8981\u643a\u5e26\u72b6\u6001\u4fe1\u606f<\/li>\n<li>\u57fa\u4e8e\u4e8c\u8fdb\u5236\u6570\u636e\u4f20\u8f93\uff0cwebsocket\u5b9a\u4e49\u4e86\u4e8c\u8fdb\u5236\u5e27\uff0c\u53ef\u4ee5\u5904\u7406\u4e8c\u8fdb\u5236\u5185\u5bb9\uff0c\u76f8\u6bd4\u4e8e\u6587\u672c\u4f20\u8f93\uff0c\u63d0\u9ad8\u4e86\u6548\u7387<\/li>\n<li>\u652f\u6301\u81ea\u5b9a\u4e49\u5b50\u534f\u8bae\uff0c\u53ef\u4ee5\u81ea\u884c\u6269\u5c55\u534f\u8bae\uff0c\u5982\u90e8\u5206\u6d4f\u89c8\u5668\u652f\u6301\u538b\u7f29\u7b49<\/li>\n<li>\u66f4\u597d\u7684\u538b\u7f29\u6548\u679c\uff0cWebsocket\u5728\u9002\u5f53\u7684\u6269\u5c55\u652f\u6301\u4e0b\uff0c\u53ef\u4ee5\u6cbf\u7528\u4e4b\u524d\u5185\u5bb9\u7684\u4e0a\u4e0b\u6587\uff0c\u5728\u4f20\u9012\u7c7b\u4f3c\u7684\u6570\u636e\u65f6\uff0c\u53ef\u4ee5\u663e\u8457\u5730\u63d0\u9ad8\u538b\u7f29\u7387<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 class=\"heading\" data-id=\"heading-73\"><span id=\"17\">\u5341\u4e03\u3001\u957f\u8fde\u63a5\u4e0e\u77ed\u8fde\u63a5<\/span><\/h2>\n<h3 class=\"heading\" data-id=\"heading-74\">\u77ed\u8fde\u63a5<\/h3>\n<ul>\n<li>HTTP\/1.0\u4e2d\u9ed8\u8ba4\u4f7f\u7528\u77ed\u8fde\u63a5\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u6bcf\u8fdb\u884c\u4e00\u6b21HTTP\u64cd\u4f5c\uff0c\u5c31\u5efa\u7acb\u4e00\u6b21\u8fde\u63a5\uff0c\u4efb\u52a1\u7ed3\u675f\u5c31\u4e2d\u65ad\u8fde\u63a5<\/li>\n<li>\u5f53\u5ba2\u6237\u7aef\u6d4f\u89c8\u5668\u8bbf\u95ee\u7684\u67d0\u4e2aHTML\u6216\u5176\u4ed6\u7c7b\u578b\u7684Web\u9875\u4e2d\u5305\u542b\u6709\u5176\u4ed6\u7684Web\u8d44\u6e90\uff08\u5982JavaScript\u6587\u4ef6\u3001\u56fe\u50cf\u6587\u4ef6\u3001CSS\u6587\u4ef6\u7b49\uff09\uff0c\u6bcf\u9047\u5230\u8fd9\u6837\u4e00\u4e2aWeb\u8d44\u6e90\uff0c\u6d4f\u89c8\u5668\u5c31\u4f1a\u91cd\u65b0\u5efa\u7acb\u4e00\u4e2aHTTP\u4f1a\u8bdd<\/li>\n<li>\u77ed\u8fde\u63a5\u7684\u64cd\u4f5c\u6b65\u9aa4\u662f\uff1a\u5efa\u7acb\u8fde\u63a5\u2014\u2014\u6570\u636e\u4f20\u8f93\u2014\u2014\u5173\u95ed\u8fde\u63a5&#8230;\u5efa\u7acb\u8fde\u63a5\u2014\u2014\u6570\u636e\u4f20\u8f93\u2014\u2014\u5173\u95ed\u8fde\u63a5<\/li>\n<li>\u50cfWEB\u7f51\u7ad9\u7684http\u670d\u52a1\u4e00\u822c\u90fd\u7528\u77ed\u8fde\u63a5\uff0c\u5e76\u53d1\u91cf\u5927\uff0c\u4f46\u6bcf\u4e2a\u7528\u6237\u65e0\u9700\u9891\u7e41\u64cd\u4f5c\u60c5\u51b5\u4e0b\u9700\u7528\u77ed\u8fde\u63a5<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-75\">\u957f\u8fde\u63a5<\/h3>\n<ul>\n<li>\u4eceHTTP\/1.1\u8d77\uff0c\u9ed8\u8ba4\u4f7f\u7528\u957f\u8fde\u63a5\uff0c\u7528\u4ee5\u4fdd\u6301\u8fde\u63a5\u7279\u6027\u3002\u4f7f\u7528\u957f\u8fde\u63a5\u7684HTTP\u534f\u8bae\uff0c\u4f1a\u5728\u54cd\u5e94\u5934\u52a0\u5165\u8fd9\u884c\u4ee3\u7801<code>Connection:keep-alive<\/code><\/li>\n<li>\u5728\u4f7f\u7528\u957f\u8fde\u63a5\u7684\u60c5\u51b5\u4e0b\uff0c\u5f53\u4e00\u4e2a\u7f51\u9875\u6253\u5f00\u5b8c\u6210\u540e\uff0c\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u4e4b\u95f4\u7528\u4e8e\u4f20\u8f93HTTP\u6570\u636e\u7684TCP\u8fde\u63a5\u4e0d\u4f1a\u5173\u95ed\uff0c\u5ba2\u6237\u7aef\u518d\u6b21\u8bbf\u95ee\u8fd9\u4e2a\u670d\u52a1\u5668\u65f6\uff0c\u4f1a\u7ee7\u7eed\u4f7f\u7528\u8fd9\u4e00\u6761\u5df2\u7ecf\u5efa\u7acb\u7684\u8fde\u63a5<\/li>\n<li>keep-alive\u4e0d\u4f1a\u6c38\u4e45\u4fdd\u6301\u8fde\u63a5\uff0c\u5b83\u6709\u4e00\u4e2a\u4fdd\u6301\u65f6\u95f4\uff0c\u53ef\u4ee5\u5728\u4e0d\u540c\u7684\u670d\u52a1\u5668\u8f6f\u4ef6\uff08\u5982Apache\uff09\u4e2d\u8bbe\u5b9a\u8fd9\u4e2a\u65f6\u95f4\u3002\u5b9e\u73b0\u957f\u8fde\u63a5\u9700\u8981\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u90fd\u652f\u6301\u957f\u8fde\u63a5<\/li>\n<li>\u957f\u8fde\u63a5\u7684\u64cd\u4f5c\u6b65\u9aa4\u662f\uff1a\u5efa\u7acb\u8fde\u63a5\u2014\u2014\u6570\u636e\u4f20\u8f93&#8230;\uff08\u4fdd\u6301\u8fde\u63a5\uff09&#8230;\u6570\u636e\u4f20\u8f93\u2014\u2014\u5173\u95ed\u8fde\u63a5<\/li>\n<li>\u957f\u8fde\u63a5\u591a\u7528\u4e8e\u64cd\u4f5c\u9891\u7e41\uff0c\u70b9\u5bf9\u70b9\u7684\u901a\u8baf\uff0c\u800c\u4e14\u8fde\u63a5\u6570\u4e0d\u80fd\u592a\u591a\u60c5\u51b5<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-76\">\u957f\u77ed\u8f6e\u8be2\u548c\u957f\u77ed\u8fde\u63a5\u533a\u522b<\/h3>\n<ul>\n<li>HTTP\u534f\u8bae\u7684\u957f\u8fde\u63a5\u548c\u77ed\u8fde\u63a5\uff0c\u5b9e\u8d28\u4e0a\u662fTCP\u534f\u8bae\u7684\u957f\u8fde\u63a5\u548c\u77ed\u8fde\u63a5<\/li>\n<li>\u957f\u77ed\u8fde\u63a5\u901a\u8fc7\u53cc\u65b9\u8bf7\u6c42\u54cd\u5e94\u5934\u662f\u5426\u8bbe\u7f6e<code>Connection:keep-alive<\/code>\u6765\u51b3\u5b9a\u4f7f\u7528\uff0c\u800c\u662f\u5426\u8f6e\u8be2\uff0c\u662f\u6839\u636e\u670d\u52a1\u7aef\u7684\u5904\u7406\u65b9\u5f0f\u6765\u51b3\u5b9a\u7684\uff0c\u4e0e\u5ba2\u6237\u7aef\u6ca1\u6709\u5173\u7cfb<\/li>\n<li>\u5b9e\u73b0\u65b9\u5f0f\u4e0d\u540c\uff0c\u957f\u77ed\u8fde\u63a5\u901a\u8fc7\u534f\u8bae\u6765\u5b9e\u73b0\uff0c\u800c\u957f\u77ed\u8f6e\u8be2\u901a\u8fc7\u670d\u52a1\u5668\u7f16\u7a0b\u624b\u52a8\u5b9e\u73b0<\/li>\n<\/ul>\n<h2 class=\"heading\" data-id=\"heading-77\"><span id=\"18\">\u5341\u516b\u3001\u5b58\u50a8<\/span><\/h2>\n<h3 class=\"heading\" data-id=\"heading-78\">Cookie<\/h3>\n<ul>\n<li>cookie\u662f\u7531\u670d\u52a1\u5668\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef\u7528\u4e8e\u5b58\u50a8\u5c11\u91cf\u4fe1\u606f\uff0c\u4ee5\u952e\u503c\u5bf9\u5f62\u5f0f\u5b58\u50a8{key\uff1avalue}<\/li>\n<\/ul>\n<p><\/p><figure><img decoding=\"async\" alt=\"cookie\u539f\u7406\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d55c683250a9?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"924\" data-height=\"470\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;924&quot; 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src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d5619add7922?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\"><figcaption><\/figcaption><\/figure><p><\/p>\n<ul>\n<li>\u7528\u6237\u7b2c\u4e00\u6b21\u8bf7\u6c42\u670d\u52a1\u5668\u7684\u65f6\u5019\uff0c\u670d\u52a1\u5668\u6839\u636e\u7528\u6237\u63d0\u4ea4\u7684\u76f8\u5173\u4fe1\u606f\uff0c\u521b\u5efa\u521b\u5efa\u5bf9\u5e94\u7684 session \uff0c\u8bf7\u6c42\u8fd4\u56de\u65f6\u5c06\u6b64 session \u7684\u552f\u4e00\u6807\u8bc6\u4fe1\u606f sessionID \u8fd4\u56de\u7ed9\u6d4f\u89c8\u5668\uff0c\u6d4f\u89c8\u5668\u63a5\u6536\u5230\u670d\u52a1\u5668\u8fd4\u56de\u7684 sessionID \u4fe1\u606f\u540e\uff0c\u4f1a\u5c06\u6b64\u4fe1\u606f\u5b58\u5165\u5230 Cookie \u4e2d\uff0c\u540c\u65f6 Cookie \u8bb0\u5f55\u6b64 sessionID \u5c5e\u4e8e\u54ea\u4e2a\u57df\u540d<\/li>\n<li>\u5f53\u7528\u6237\u7b2c\u4e8c\u6b21\u8bbf\u95ee\u670d\u52a1\u5668\u7684\u65f6\u5019\uff0c\u8bf7\u6c42\u4f1a\u81ea\u52a8\u5224\u65ad\u6b64\u57df\u540d\u4e0b\u662f\u5426\u5b58\u5728 Cookie \u4fe1\u606f\uff0c\u5982\u679c\u5b58\u5728\u81ea\u52a8\u5c06 Cookie \u4fe1\u606f\u4e5f\u53d1\u9001\u7ed9\u670d\u52a1\u7aef\uff0c\u670d\u52a1\u7aef\u4f1a\u4ece Cookie \u4e2d\u83b7\u53d6 sessionID\uff0c\u518d\u6839\u636e sessionID \u67e5\u627e\u5bf9\u5e94\u7684 session \u4fe1\u606f\uff0c\u5982\u679c\u6ca1\u6709\u627e\u5230\u8bf4\u660e\u7528\u6237\u6ca1\u6709\u767b\u5f55\u6216\u8005\u767b\u5f55\u5931\u6548\uff0c\u5982\u679c\u627e\u5230 session \u8bc1\u660e\u7528\u6237\u5df2\u7ecf\u767b\u5f55\u53ef\u6267\u884c\u540e\u9762\u64cd\u4f5c<\/li>\n<li>session \u7684\u8fd0\u884c\u4f9d\u8d56 session id\uff0c\u800c session id \u662f\u5b58\u5728 Cookie\u4e2d\u7684<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-80\">cookie\u4e0esession\u7684\u533a\u522b<\/h3>\n<ul>\n<li>cookie\u6570\u636e\u5b58\u653e\u5728\u5ba2\u6237\u7684\u6d4f\u89c8\u5668\u4e0a\uff0csession\u6570\u636e\u653e\u5728\u670d\u52a1\u5668\u4e0a<\/li>\n<li>cookie\u4e0d\u662f\u5f88\u5b89\u5168\uff0c\u522b\u4eba\u53ef\u4ee5\u5206\u6790\u5b58\u653e\u5728\u672c\u5730\u7684cookie\u5e76\u8fdb\u884ccookie\u6b3a\u9a97\uff0c\u8003\u8651\u5230\u5b89\u5168\u5e94\u5f53\u4f7f\u7528session\u3002\u7528\u6237\u9a8c\u8bc1\u8fd9\u79cd\u573a\u5408\u4e00\u822c\u4f1a\u7528 session<\/li>\n<li>session\u4fdd\u5b58\u5728\u670d\u52a1\u5668\uff0c\u5ba2\u6237\u7aef\u4e0d\u77e5\u9053\u5176\u4e2d\u7684\u4fe1\u606f\uff1b\u53cd\u4e4b\uff0ccookie\u4fdd\u5b58\u5728\u5ba2\u6237\u7aef\uff0c\u670d\u52a1\u5668\u80fd\u591f\u77e5\u9053\u5176\u4e2d\u7684\u4fe1\u606f<\/li>\n<li>session\u4f1a\u5728\u4e00\u5b9a\u65f6\u95f4\u5185\u4fdd\u5b58\u5728\u670d\u52a1\u5668\u4e0a\uff0c\u5f53\u8bbf\u95ee\u589e\u591a\uff0c\u4f1a\u6bd4\u8f83\u5360\u7528\u4f60\u670d\u52a1\u5668\u7684\u6027\u80fd\uff0c\u8003\u8651\u5230\u51cf\u8f7b\u670d\u52a1\u5668\u6027\u80fd\u65b9\u9762\uff0c\u5e94\u5f53\u4f7f\u7528cookie<\/li>\n<li>session\u4e2d\u4fdd\u5b58\u7684\u662f\u5bf9\u8c61\uff0ccookie\u4e2d\u4fdd\u5b58\u7684\u662f\u5b57\u7b26\u4e32<\/li>\n<li>session\u4e0d\u80fd\u533a\u5206\u8def\u5f84\uff0c\u540c\u4e00\u4e2a\u7528\u6237\u5728\u8bbf\u95ee\u4e00\u4e2a\u7f51\u7ad9\u671f\u95f4\uff0c\u6240\u6709\u7684session\u5728\u4efb\u4f55\u4e00\u4e2a\u5730\u65b9\u90fd\u53ef\u4ee5\u8bbf\u95ee\u5230\uff0c\u800ccookie\u4e2d\u5982\u679c\u8bbe\u7f6e\u4e86\u8def\u5f84\u53c2\u6570\uff0c\u90a3\u4e48\u540c\u4e00\u4e2a\u7f51\u7ad9\u4e2d\u4e0d\u540c\u8def\u5f84\u4e0b\u7684cookie\u4e92\u76f8\u662f\u8bbf\u95ee\u4e0d\u5230\u7684<\/li>\n<li>session: \u662f\u5728\u670d\u52a1\u7aef\u4fdd\u5b58\u7684\u4e00\u4e2a\u6570\u636e\u7ed3\u6784\uff0c\u7528\u6765\u8ddf\u8e2a\u7528\u6237\u7684\u72b6\u6001\uff0c\u8fd9\u4e2a\u6570\u636e\u53ef\u4ee5\u4fdd\u5b58\u5728\u96c6\u7fa4\u3001\u6570\u636e\u5e93\u3001\u6587\u4ef6\u4e2d<\/li>\n<li>cookie: \u662f\u5ba2\u6237\u7aef\u4fdd\u5b58\u7528\u6237\u4fe1\u606f\u7684\u4e00\u79cd\u673a\u5236\uff0c\u7528\u6765\u8bb0\u5f55\u7528\u6237\u7684\u4e00\u4e9b\u4fe1\u606f\uff0c\u4e5f\u662f\u5b9e\u73b0session\u7684\u4e00\u79cd\u65b9\u5f0f<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-81\">\u672c\u5730\u5b58\u50a8localStorage\u4e0esessionStorage<\/h3>\n<h4 class=\"heading\" data-id=\"heading-82\">localStorage<\/h4>\n<ul>\n<li>localStorage\u6d4f\u89c8\u5668api\uff0c\u7528\u4e8e\u5b58\u50a8\u672c\u5730\u6570\u636e\uff0c\u53ef\u6301\u4e45\u5316\uff0c\u6c38\u4e0d\u8fc7\u671f\uff0c\u9664\u975e\u4e3b\u52a8\u5220\u9664<\/li>\n<\/ul>\n<p>\u57fa\u672c\u4f7f\u7528<\/p>\n<pre><code class=\"hljs localStorage copyable\" lang=\"localStorage\">localStorage.setItem(\"b\", \"isaac\");  \/\/\u8bbe\u7f6eb\u4e3a\"isaac\"\nlocalStorage.getItem(\"b\");           \/\/\u83b7\u53d6b\u7684\u503c,\u4e3a\"isaac\"\nlocalStorage.key(0);                 \/\/\u83b7\u53d6\u7b2c0\u4e2a\u6570\u636e\u9879\u7684\u952e\u540d\uff0c\u6b64\u5904\u5373\u4e3a\u201cb\u201d\nlocalStorage.removeItem(\"b\");        \/\/\u6e05\u9664c\u7684\u503c\nlocalStorage.clear();                \/\/\u6e05\u9664\u5f53\u524d\u57df\u540d\u4e0b\u7684\u6240\u6709localStorage\u6570\u636e\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li>localStorage\u53ea\u8981\u5728\u76f8\u540c\u7684\u534f\u8bae\u3001\u76f8\u540c\u7684\u4e3b\u673a\u540d\u3001\u76f8\u540c\u7684\u7aef\u53e3\u4e0b\uff0c\u5c31\u80fd\u8bfb\u53d6\/\u4fee\u6539\u5230\u540c\u4e00\u4efdlocalStorage\u6570\u636e\uff0c\u4e00\u822c\u7528\u4e8e\u8de8\u9875\u9762\u5171\u4eab\u6570\u636e<\/li>\n<li>\u53ef\u901a\u8fc7<code>window.addEventListener(\"storage\", function(e){}<\/code>\u8bbe\u7f6elocalStorage\u4e8b\u4ef6\u76d1\u542c\uff0c\u5f53\u5b58\u50a8\u533a\u57df\u7684\u5185\u5bb9\u53d1\u751f\u6539\u53d8\u65f6\uff0c\u5c06\u4f1a\u8c03\u7528\u56de\u8c03<\/li>\n<\/ul>\n<h4 class=\"heading\" data-id=\"heading-83\">sessionStorage<\/h4>\n<ul>\n<li>sessionStorage\u7528\u4e8e\u672c\u5730\u5b58\u50a8\u4e00\u4e2a\u4f1a\u8bdd\uff08session\uff09\u4e2d\u7684\u6570\u636e\uff0c\u8fd9\u4e9b\u6570\u636e\u53ea\u6709\u5728\u540c\u4e00\u4e2a\u4f1a\u8bdd\u4e2d\u7684\u9875\u9762\u624d\u80fd\u8bbf\u95ee\u5e76\u4e14\u5f53\u4f1a\u8bdd\u7ed3\u675f\u540e\u6570\u636e\u4e5f\u968f\u4e4b\u9500\u6bc1\u3002\u56e0\u6b64sessionStorage\u4e0d\u662f\u4e00\u79cd\u6301\u4e45\u5316\u7684\u672c\u5730\u5b58\u50a8\uff0c\u4ec5\u4ec5\u662f\u4f1a\u8bdd\u7ea7\u522b\u7684\u5b58\u50a8<\/li>\n<\/ul>\n<pre><code class=\"hljs sessionStorage copyable\" lang=\"sessionStorage\">sessionStorage.setItem(name, num);    \/\/\u5b58\u50a8\u6570\u636e\nsessionStorage.setItem('value2', 119);\nsessionStorage.valueOf();             \/\/\u83b7\u53d6\u5168\u90e8\u6570\u636e\nsessionStorage.getItem(name);         \/\/\u83b7\u53d6\u6307\u5b9a\u952e\u540d\u6570\u636e\nsessionStorage.sessionData;           \/\/sessionStorage\u662fjs\u5bf9\u8c61\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528key\u7684\u65b9\u5f0f\u6765\u83b7\u53d6\u503c\nsessionStorage.removeItem(name);      \/\/\u5220\u9664\u6307\u5b9a\u952e\u540d\u6570\u636e\nsessionStorage.clear();\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li>\u4f7f\u7528\u65b9\u5f0f\u4e0elocalStorage\u7c7b\u4f3c<\/li>\n<li>\u4ec5\u5728\u5f53\u524d\u7f51\u9875\u4f1a\u8bdd\u4e0b\u6709\u6548\uff0c\u5173\u95ed\u9875\u9762\u6216\u6d4f\u89c8\u5668\u540e\u5c31\u4f1a\u88ab\u6e05\u9664<\/li>\n<li>\u4e3b\u8981\u7528\u4e8e\u5b58\u50a8\u5f53\u524d\u9875\u9762\u72ec\u6709\u7684\u6570\u636e\uff0c\u4e0d\u4e0e\u6d4f\u89c8\u5668\u5176\u4ed6\u9875\u9762\u5171\u4eab<\/li>\n<\/ul>\n<h4 class=\"heading\" data-id=\"heading-84\">\u533a\u522b<\/h4>\n<ul>\n<li>\u6570\u636e\u5b58\u50a8\u65b9\u9762\n<ul>\n<li>cookie\u6570\u636e\u59cb\u7ec8\u5728\u540c\u6e90\u7684http\u8bf7\u6c42\u4e2d\u643a\u5e26\uff08\u5373\u4f7f\u4e0d\u9700\u8981\uff09\uff0c\u5373cookie\u5728\u6d4f\u89c8\u5668\u548c\u670d\u52a1\u5668\u95f4\u6765\u56de\u4f20\u9012\u3002cookie\u6570\u636e\u8fd8\u6709\u8def\u5f84\uff08path\uff09\u7684\u6982\u5ff5\uff0c\u53ef\u4ee5\u9650\u5236cookie\u53ea\u5c5e\u4e8e\u67d0\u4e2a\u8def\u5f84\u4e0b<\/li>\n<li>sessionStorage\u548clocalStorage\u4e0d\u4f1a\u81ea\u52a8\u628a\u6570\u636e\u53d1\u9001\u7ed9\u670d\u52a1\u5668\uff0c\u4ec5\u5728\u672c\u5730\u4fdd\u5b58\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u5b58\u50a8\u6570\u636e\u5927\u5c0f\n<ul>\n<li>\u5b58\u50a8\u5927\u5c0f\u9650\u5236\u4e5f\u4e0d\u540c\uff0ccookie\u6570\u636e\u4e0d\u80fd\u8d85\u8fc74K\uff0c\u540c\u65f6\u56e0\u4e3a\u6bcf\u6b21http\u8bf7\u6c42\u90fd\u4f1a\u643a\u5e26cookie\u3001\u6240\u4ee5cookie\u53ea\u9002\u5408\u4fdd\u5b58\u5f88\u5c0f\u7684\u6570\u636e\uff0c\u5982\u4f1a\u8bdd\u6807\u8bc6\u3002<\/li>\n<li>sessionStorage\u548clocalStorage\u867d\u7136\u4e5f\u6709\u5b58\u50a8\u5927\u5c0f\u7684\u9650\u5236\uff0c\u4f46\u6bd4cookie\u5927\u5f97\u591a\uff0c\u53ef\u4ee5\u8fbe\u52305M\u6216\u66f4\u5927<\/li>\n<\/ul>\n<\/li>\n<li>\u6570\u636e\u5b58\u50a8\u6709\u6548\u671f\n<ul>\n<li>sessionStorage\uff1a\u4ec5\u5728\u5f53\u524d\u6d4f\u89c8\u5668\u7a97\u53e3\u5173\u95ed\u4e4b\u524d\u6709\u6548\uff1b\nlocalStorage\uff1a\u59cb\u7ec8\u6709\u6548\uff0c\u7a97\u53e3\u6216\u6d4f\u89c8\u5668\u5173\u95ed\u4e5f\u4e00\u76f4\u4fdd\u5b58\uff0c\u672c\u5730\u5b58\u50a8\uff0c\u56e0\u6b64\u7528\u4f5c\u6301\u4e45\u6570\u636e\uff1b<\/li>\n<li>cookie\uff1a\u53ea\u5728\u8bbe\u7f6e\u7684cookie\u8fc7\u671f\u65f6\u95f4\u4e4b\u524d\u6709\u6548\uff0c\u5373\u4f7f\u7a97\u53e3\u5173\u95ed\u6216\u6d4f\u89c8\u5668\u5173\u95ed<\/li>\n<\/ul>\n<\/li>\n<li>\u4f5c\u7528\u57df\u4e0d\u540c\n<ul>\n<li>sessionStorage\u4e0d\u5728\u4e0d\u540c\u7684\u6d4f\u89c8\u5668\u7a97\u53e3\u4e2d\u5171\u4eab\uff0c\u5373\u4f7f\u662f\u540c\u4e00\u4e2a\u9875\u9762\uff1b<\/li>\n<li>localStorage\u5728\u6240\u6709\u540c\u6e90\u7a97\u53e3\u4e2d\u90fd\u662f\u5171\u4eab\u7684\uff1b\u4e5f\u5c31\u662f\u8bf4\u53ea\u8981\u6d4f\u89c8\u5668\u4e0d\u5173\u95ed\uff0c\u6570\u636e\u4ecd\u7136\u5b58\u5728<\/li>\n<li>cookie: \u4e5f\u662f\u5728\u6240\u6709\u540c\u6e90\u7a97\u53e3\u4e2d\u90fd\u662f\u5171\u4eab\u7684.\u4e5f\u5c31\u662f\u8bf4\u53ea\u8981\u6d4f\u89c8\u5668\u4e0d\u5173\u95ed\uff0c\u6570\u636e\u4ecd\u7136\u5b58\u5728<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><\/p><figure><img decoding=\"async\" alt=\"storage\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d566c4dee532?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"1158\" data-height=\"450\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;1158&quot; height=&quot;450&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<h2 class=\"heading\" data-id=\"heading-85\"><span id=\"19\">\u5341\u4e5d\u3001\u8de8\u57df<\/span><\/h2>\n<h3 class=\"heading\" data-id=\"heading-86\">jsonp<\/h3>\n<ul>\n<li>jsonp\u662f\u4e00\u79cd\u8de8\u57df\u901a\u4fe1\u624b\u6bb5\uff0c\u901a\u8fc7script\u6807\u7b7e\u7684src\u5c5e\u6027\u5b9e\u73b0\u8de8\u57df\uff0c\u7531\u4e8e\u6d4f\u89c8\u5668\u540c\u6e90\u7b56\u7565\uff0c\u5e76\u4e0d\u4f1a\u622a\u65adscript\u7684\u8de8\u57df\u54cd\u5e94<\/li>\n<li>\u901a\u8fc7\u5c06\u524d\u7aef\u65b9\u6cd5\u540d\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u5230\u670d\u52a1\u5668\u7aef\uff0c\u7136\u540e\u7531\u670d\u52a1\u5668\u7aef\u6ce8\u5165\u53c2\u6570\u4e4b\u540e\u518d\u8fd4\u56de\uff0c\u5b9e\u73b0\u670d\u52a1\u5668\u7aef\u5411\u5ba2\u6237\u7aef\u901a\u4fe1<\/li>\n<li>\u7531\u4e8e\u4f7f\u7528script\u6807\u7b7e\u7684src\u5c5e\u6027\uff0c\u56e0\u6b64\u53ea\u652f\u6301get\u65b9\u6cd5<\/li>\n<\/ul>\n<p>\u6765\u5b9e\u73b0\u4e00\u4e0b\u5427<\/p>\n<pre><code class=\"hljs jsonp copyable\" lang=\"jsonp\">\/\/ \u524d\u7aef\u51c6\u5907\n\/\/ \u5b9a\u4e49\u56de\u8c03\u51fd\u6570\nfunction fn(arg) {\n  \/\/ arg\u4e3a\u670d\u52a1\u7aef\u4f20\u6765\u7684\u6570\u636e\n  console.log(`\u5ba2\u6237\u7aef\u83b7\u53d6\u7684\u6570\u636e\uff1a${arg}`)\n}\n\/\/ \u521b\u5efascript\u6807\u7b7e\nconst s = document.createElement('script')\n\/\/ \u7ed9script\u6807\u7b7e\u7684src\u5c5e\u6027\u8d4b\u503c\uff0c\u503c\u4e3a\u8bf7\u6c42url\uff0c\u67e5\u8be2\u53c2\u6570callback\uff0c\u9700\u4e0e\u540e\u7aef\u5bf9\u5e94\n\/\/ fn\u4e3a\u524d\u7aef\u56de\u8c03\u51fd\u6570\u540d\ns.src = `http:\/\/127.0.0.1:3000\/test?callback=fn`\n\/\/ \u5411html\u6dfb\u52a0\u6b64\u6807\u7b7e\uff0c\u6dfb\u52a0\u5b8c\u6210\u4e4b\u540e\u6d4f\u89c8\u5668\u81ea\u52a8\u8bf7\u6c42script\u7684src\u5bf9\u5e94\u7684\u7f51\u5740\ndocument.getElementsByTagName('head')[0].appendChild(s);\n\/\/ \u7b49\u5f85\u6d4f\u89c8\u5668\u6536\u5230\u54cd\u5e94\u4e4b\u540e\uff0c\u5c06\u4f1a\u81ea\u52a8\u6267\u884c\u54cd\u5e94\u5185\u5bb9\u7684\u4ee3\u7801\n----------------------------------------------\n\/\/ \u540e\u7aef\u51c6\u5907\n\/\/ nestjs(ts)\u5904\u7406\n@Controller('test') \/\/api\nexport class TestController {\n  @Get() \/\/get\u65b9\u5f0f\u8bf7\u6c42\n  \/\/\u53d6url\u4e2d\u7684\u67e5\u8be2\u53c2\u6570\uff0c\u5373?\u4e4b\u540e\u7684\u952e\u503c\u5bf9\uff0c\u952e\u4e0e\u503c\u5bf9\u5e94query\u5bf9\u8c61\u53c2\u6570\u7684\u952e\u4e0e\u503c\n  callback(@Query() query) {  \n    \/\/ \u8fd4\u56de\u7684\u6570\u636e\n    const data = '\u6211\u662f\u670d\u52a1\u7aef\u8fd4\u56de\u7684\u6570\u636e';\n    \/\/ \u53d6\u67e5\u8be2\u53c2\u6570\uff0c\u8fd9\u91cc\u7684callback\u8981\u4e0e\u524d\u7aef?\u4e4b\u540e\u7684\u952e\u540d\u4e00\u81f4\uff0cfn\u5373fn\u51fd\u6570\u540d\n    const fn = query.callback;\n    \/\/ \u8fd4\u56de\u7ed3\u679c\uff0c\u683c\u5f0f\uff1a\u51fd\u6570\u540d(\u670d\u52a1\u5668\u7684\u6570\u636e)\uff0c\u6ce8\u610f\u8fd9\u91cc\u9700\u8981\u5e8f\u5217\u5316\u6210\u5b57\u7b26\u4e32\uff0c\u5982\u679c\u53c2\u6570\u672c\u8eab\u662f\u5b57\u7b26\u4e32\u90a3\u4e48\u8981\u52a0\u5f15\u53f7\uff0c\u524d\u7aef\u5e76\u4e0d\u77e5\u9053data\u662f\u5b57\u7b26\u4e32\n    return `${fn}('${data}')`;\n  }\n}\n\n\/\/ express(js)\u5904\u7406\uff0c\u540c\u4e0a\nrouter.get('\/test', async (req, res) =&gt; {\n  const data = '\u6211\u662f\u670d\u52a1\u5668\u8fd4\u56de\u7684\u6570\u636e'\n  \/\/ req.query\u4e3a\u67e5\u8be2\u53c2\u6570\u5217\u8868\n  const fn = req.query.callback\n  \/\/ \u8fd4\u56de\u6570\u636e\n  res.send(`${fn}('${data}')`)\n})\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><p>\u54cd\u5e94\u5185\u5bb9<\/p>\n<p><\/p><figure><img decoding=\"async\" alt=\"jsonp\u54cd\u5e94\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d571d31cb770?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"319\" data-height=\"85\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;319&quot; height=&quot;85&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<h3 class=\"heading\" data-id=\"heading-87\">CORS<\/h3>\n<ul>\n<li>\u8de8\u57df\u8d44\u6e90\u5171\u4eabcors\uff0c\u5b83\u4f7f\u7528\u989d\u5916\u7684 HTTP \u5934\u6765\u544a\u8bc9\u6d4f\u89c8\u5668\uff0c\u8ba9\u8fd0\u884c\u5728\u4e00\u4e2a origin (domain) \u4e0a\u7684Web\u5e94\u7528\u88ab\u51c6\u8bb8\u8bbf\u95ee\u6765\u81ea\u4e0d\u540c\u6e90\u670d\u52a1\u5668\u4e0a\u7684\u6307\u5b9a\u7684\u8d44\u6e90<\/li>\n<li>\u9700\u8981\u670d\u52a1\u7aef\u4e0e\u5ba2\u6237\u7aef\u540c\u65f6\u652f\u6301cors\u8de8\u57df\u65b9\u5f0f\u624d\u80fd\u8fdb\u884c\u8de8\u57df\u8bf7\u6c42\uff0c\u670d\u52a1\u7aef\u901a\u8fc7\u8bbe\u7f6e<code>Access-Control-Allow-Origin:*<\/code>\u5373\u53ef\u5f00\u542fcors\u5141\u8bb8\u8de8\u57df\u8bf7\u6c42\uff0c\u4f7f\u7528\u901a\u914d\u7b26*\u8868\u793a\u5141\u8bb8\u6240\u6709\u4e0d\u540c\u57df\u7684\u6e90\u8bbf\u95ee\u8d44\u6e90\uff0c\u4e5f\u53ef\u5355\u72ec\u8bbe\u7f6e\u6307\u5b9a\u5141\u8bb8\u7684\u6e90\u57df\u540d<\/li>\n<li>\u4f7f\u7528cors\u8de8\u57df\u65f6\uff0c\u5c06\u4f1a\u5728\u53d1\u8d77\u8bf7\u6c42\u65f6\u51fa\u73b02\u79cd\u60c5\u51b5\uff1a<\/li>\n<li>\u7b80\u5355\u8bf7\u6c42\uff0c\u9700\u6ee1\u8db3\u4ee5\u4e0b\u6761\u4ef6\n<ul>\n<li>\u4f7f\u7528get\u3001head\u3001post\u65b9\u5f0f\u53d1\u8d77\u7684\u8bf7\u6c42<\/li>\n<li>Content-Type \u7684\u503c\u4ec5\u9650\u4e8e\u4e0b\u5217\u4e09\u8005\u4e4b\u4e00\uff1a\n<ul>\n<li>text\/plain<\/li>\n<li>multipart\/form-data<\/li>\n<li>application\/x-www-form-urlencoded<\/li>\n<\/ul>\n<\/li>\n<li>\u4e0d\u6ee1\u8db3\u8fd9\u4e9b\u6761\u4ef6\u5373\u4e3a\u9884\u68c0\u8bf7\u6c42<\/li>\n<\/ul>\n<\/li>\n<li>\u9884\u68c0\u8bf7\u6c42\n<ul>\n<li>\u9700\u9884\u68c0\u7684\u8bf7\u6c42\u8981\u6c42\u5fc5\u987b\u9996\u5148\u4f7f\u7528OPTIONS\u65b9\u6cd5\u53d1\u8d77\u4e00\u4e2a\u9884\u68c0\u8bf7\u6c42\u5230\u670d\u52a1\u5668\uff0c\u4ee5\u83b7\u77e5\u670d\u52a1\u5668\u662f\u5426\u5141\u8bb8\u8be5\u5b9e\u9645\u8bf7\u6c42<\/li>\n<li>\u9884\u68c0\u8bf7\u6c42\u7684\u4f7f\u7528\uff0c\u53ef\u4ee5\u907f\u514d\u8de8\u57df\u8bf7\u6c42\u5bf9\u670d\u52a1\u5668\u7684\u7528\u6237\u6570\u636e\u4ea7\u751f\u672a\u9884\u671f\u7684\u5f71\u54cd<\/li>\n<li>\u5f53\u6ee1\u8db3\u4ee5\u4e0b\u6761\u4ef6\u4e4b\u4e00\uff0c\u5c06\u4f1a\u53d1\u9001\u9884\u68c0\u8bf7\u6c42\n<ul>\n<li>\u4f7f\u7528\u4e86\u4e0b\u9762\u4efb\u4e00 HTTP \u65b9\u6cd5\uff1a<\/li>\n<li>PUT<\/li>\n<li>DELETE<\/li>\n<li>CONNECT<\/li>\n<li>OPTIONS<\/li>\n<li>TRACE<\/li>\n<li>PATCH<\/li>\n<\/ul>\n<\/li>\n<li>\u4eba\u4e3a\u8bbe\u7f6e\u4e86\u5bf9 CORS \u5b89\u5168\u7684\u9996\u90e8\u5b57\u6bb5\u96c6\u5408\u4e4b\u5916\u7684\u5176\u4ed6\u9996\u90e8\u5b57\u6bb5\u3002\u8be5\u96c6\u5408\u4e3a\uff1a\n<ul>\n<li>Accept<\/li>\n<li>Accept-Language<\/li>\n<li>Content-Language<\/li>\n<li>Content-Type (\u9700\u8981\u6ce8\u610f\u989d\u5916\u7684\u9650\u5236)<\/li>\n<li>DPR<\/li>\n<li>Downlink<\/li>\n<li>Save-Data<\/li>\n<li>Viewport-Width<\/li>\n<li>Width<\/li>\n<\/ul>\n<\/li>\n<li>Content-Type \u7684\u503c\u4e0d\u5c5e\u4e8e\u4e0b\u5217\u4e4b\u4e00:\n<ul>\n<li>application\/x-www-form-urlencoded<\/li>\n<li>multipart\/form-data<\/li>\n<li>text\/plain<\/li>\n<\/ul>\n<\/li>\n<li>\u6ee1\u8db3\u4ee5\u4e0a\u6761\u4ef6\u4e4b\u4e00\u5c06\u4f1a\u53d1\u8d77\u9884\u68c0\u8bf7\u6c42\uff0c\u603b\u5171\u4f1a\u53d1\u8d772\u6b21\u8bf7\u6c42\uff0c\u7b2c\u4e00\u6b21\u4e3aOPTIONS\u65b9\u5f0f\u7684\u8bf7\u6c42\uff0c\u7528\u6765\u786e\u5b9a\u670d\u52a1\u5668\u662f\u5426\u652f\u6301\u8de8\u57df\uff0c\u5982\u679c\u652f\u6301\uff0c\u518d\u53d1\u8d77\u7b2c\u4e8c\u6b21\u5b9e\u9645\u8bf7\u6c42\uff0c\u5426\u5219\u4e0d\u53d1\u9001\u7b2c\u4e8c\u6b21\u8bf7\u6c42<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-88\">postMessage<\/h3>\n<ul>\n<li>postMessage\u53ef\u7528\u4e8e\u4e0d\u540c\u9875\u9762\u4e4b\u95f4\u7684\u8de8\u57df\u4f20\u9012\u6570\u636e<\/li>\n<li><code>postMessage(data,origin[, source])<\/code>data\u4e3a\u53d1\u9001\u7684\u6570\u636e\u53ea\u80fd\u53d1\u9001\u5b57\u7b26\u4e32\u4fe1\u606f\uff0corigin\u53d1\u9001\u76ee\u6807\u6e90\uff0c\u6307\u5b9a\u54ea\u4e9b\u7a97\u53e3\u80fd\u63a5\u6536\u5230\u6d88\u606f\u4e8b\u4ef6\uff0c\u5982\u679corigin\u8bbe\u7f6e\u4e3a*\u5219\u8868\u793a\u65e0\u9650\u5236\uff0csource\u4e3a\u53d1\u9001\u6d88\u606f\u7a97\u53e3\u7684window\u5bf9\u8c61\u5f15\u7528\uff0c<\/li>\n<\/ul>\n<pre><code class=\"hljs postMessage copyable\" lang=\"postMessage\">&lt;!-- test.html --&gt;\n&lt;iframe src=\"http:\/\/127.0.0.1:5501\/postMessage.html\"\nname=\"postIframe\" onload=\"messageLoad()\"&gt;&lt;\/iframe&gt;\n&lt;script&gt;\n\/\/ \u5b9a\u4e49\u52a0\u8f7d\u4e4b\u540e\u6267\u884c\u7684\u51fd\u6570\uff0c\u7ed9postMessage.html\u53d1\u9001\u6570\u636e\nfunction messageLoad() {\n  const url = 'http:\/\/127.0.0.1:5501\/postMessage.html'\n  window.postIframe.postMessage('\u7ed9postMessage\u7684\u6570\u636e', url)\n}\n\/\/ \u7528\u4e8e\u76d1\u542cpostMessage.html\u7684\u56de\u9988\uff0c\u6267\u884c\u56de\u8c03\nwindow.addEventListener('message', (event) =&gt; {\n  console.log(event.data);\n})\n&lt;\/script&gt;\n----------------------------------------------\n&lt;!-- postMessage.html --&gt;\n&lt;script&gt;\n  \/\/ \u76d1\u542ctest.html\u53d1\u6765\u7684\u6570\u636e\uff0c\u5ef6\u8fdf1\u79d2\u8fd4\u56de\u6570\u636e\n  window.addEventListener('message', (event) =&gt; {\n    setTimeout(() =&gt; {\n      event.source.postMessage('\u7ed9test\u7684\u6570\u636e', event.origin)\n    },1000)\n  })\n&lt;\/script&gt;\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li>event\u5bf9\u8c61\u7684\u51e0\u4e2a\u91cd\u8981\u5c5e\u6027\n<ul>\n<li>data \u6307\u7684\u662f\u4ece\u5176\u4ed6\u7a97\u53e3\u53d1\u9001\u8fc7\u6765\u7684\u6d88\u606f\u5bf9\u8c61<\/li>\n<li>type \u6307\u7684\u662f\u53d1\u9001\u6d88\u606f\u7684\u7c7b\u578b<\/li>\n<li>source \u6307\u7684\u662f\u53d1\u9001\u6d88\u606f\u7684\u7a97\u53e3\u5bf9\u8c61<\/li>\n<li>origin \u6307\u7684\u662f\u53d1\u9001\u6d88\u606f\u7684\u7a97\u53e3\u7684\u6e90<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-89\">window.name<\/h3>\n<ul>\n<li>\u7531\u4e8e<code>window.name<\/code>\u5c5e\u4e8e\u5168\u5c40\u5c5e\u6027\uff0c\u5728html\u4e2d\u7684iframe\u52a0\u8f7d\u65b0\u9875\u9762(\u53ef\u4ee5\u662f\u8de8\u57df)\uff0c\u901a\u8fc7iframe\u8bbe\u7f6e\u7684src\u6307\u5411\u7684\u6e90\u4e2d\u66f4\u6539name\u7684\u503c\uff0c\u540c\u65f6\u4e3b\u9875\u9762\u4e2d\u7684name\u4e5f\u968f\u4e4b\u66f4\u6539\uff0c\u4f46\u662f\u9700\u8981\u7ed9iframe\u4e2d\u7684window\u8bbe\u7f6e\u4e3a<code>about:blank<\/code>\u6216\u8005\u540c\u6e90\u9875\u9762\u5373\u53ef<\/li>\n<li>iframe\u4f7f\u7528\u4e4b\u540e\u5e94\u8be5\u5220\u9664\uff0cname\u7684\u503c\u53ea\u80fd\u4e3astring\u7c7b\u578b\uff0c\u4e14\u6570\u636e\u91cf\u6700\u5927\u652f\u63012MB<\/li>\n<\/ul>\n<pre><code class=\"hljs window.name copyable\" lang=\"window.name\">&lt;!-- test.html --&gt;\n\/\/ \u5c01\u88c5\u5e94\u8be5\u7528\u4e8e\u83b7\u53d6\u6570\u636e\u7684\u51fd\u6570\nfunction foo(url, func) {\n  let isFirst = true\n  const ifr = document.createElement('iframe')\n  loadFunc = () =&gt; {\n    if (isFirst) {\n      \/\/ \u8bbe\u7f6e\u4e3a\u540c\u6e90\n      ifr.contentWindow.location = 'about:blank'\n      isFirst = false\n    } else {\n      func(ifr.contentWindow.name)\n      ifr.contentWindow.close()\n      document.body.removeChild(ifr)\n    }\n  }\n  ifr.src = url\n  ifr.style.display = 'none'\n  document.body.appendChild(ifr)\n  \/\/ \u52a0\u8f7d\u4e4b\u540e\u7684\u56de\u8c03\n  ifr.onload = loadFunc\n}\nfoo(`http:\/\/127.0.0.1:5501\/name.html`, (data) =&gt; {\n  console.log(data) \/\/\n})\n----------------------------------------------\n&lt;!-- name.html --&gt;\nconst obj = { name: \"iframe\" }\n\/\/ \u4fee\u6539name\u7684\u503c\uff0c\u5fc5\u987b\u4e3astring\u7c7b\u578b\nwindow.name = JSON.stringify(obj);\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><h3 class=\"heading\" data-id=\"heading-90\">document.domain<\/h3>\n<ul>\n<li><code>document.domain<\/code>\u7684\u503c\u5bf9\u5e94\u5f53\u524d\u9875\u9762\u7684\u57df\u540d<\/li>\n<li>\u901a\u8fc7\u5bf9domain\u8bbe\u7f6e\u5f53\u524d\u57df\u540d\u6765\u5b9e\u73b0\u8de8\u57df\uff0c\u4e0d\u8fc7\u4ec5\u9650\u4e8e\u57df\u540d\u4e0d\u540c\uff0c\u4f46\u662f\u53c8\u8981\u5c5e\u4e8e\u540c\u4e00\u4e2a\u57fa\u7840\u57df\u540d\u4e0b\uff0c\u5982<code>http:\/\/a.baidu.com<\/code>\u4e0e<code>http:\/\/b.baidu.com<\/code>\u8fd92\u4e2a\u5b50\u57df\u540d\u4e4b\u95f4\u624d\u80fd\u4f7f\u7528domain\u8de8\u57df\uff0c\u4e00\u822c\u7528\u4e8e\u5b50\u57df\u540d\u4e4b\u95f4\u7684\u8de8\u57df\u8bbf\u95ee<\/li>\n<li>domain\u53ea\u80fd\u8d4b\u503c\u4e3a\u5f53\u524d\u57df\u540d\u6216\u8005\u5176\u57fa\u7840\u57df\u540d\uff0c\u5373\u4e0a\u7ea7\u57df\u540d<\/li>\n<\/ul>\n<pre><code class=\"hljs domain copyable\" lang=\"domain\">&lt;!-- test.html --&gt;\n&lt;script&gt;\ndocument.domain = 'baidu.com';\nconst ifr = document.createElement('iframe');\nifr.src = 'a.baidu.com\/test.html';\nifr.style.display = 'none';\ndocument.body.appendChild(ifr);\nifr.onload = function(){\n  var doc = ifr.contentDocument || ifr.contentWindow.document;\n  \/\/ \u6b64\u5904\u5373\u53ef\u64cd\u4f5cdomain.html\u7684document\n  ifr.onload = null;\n};\n&lt;\/script&gt;\n----------------------------------------------\n&lt;!-- domain.html --&gt;\n&lt;script&gt;\n  \/\/ domain.html\u4e0b\u8bbe\u7f6e\u4e3a\u4e0etest.html\u4e2d\u7684domain\u4e00\u81f4\n  document.domain = 'baidu.com';\n&lt;\/script&gt;\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li>\u4e3b\u8981\u5c31\u662f\u901a\u8fc7\u8bbe\u7f6e\u4e3a\u540c\u6e90\u57df\u540d(\u53ea\u80fd\u4e3a\u5176\u57fa\u7840\u57df\u540d)\uff0c\u901a\u8fc7iframe\u64cd\u4f5c\u53e6\u4e00\u4e2a\u9875\u9762\u7684\u5185\u5bb9<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-91\">nginx\u53cd\u5411\u4ee3\u7406<\/h3>\n<ul>\n<li>nginx\u53cd\u5411\u4ee3\u7406\uff0c\u4ee3\u7406\u4ece\u5ba2\u6237\u7aef\u6765\u7684\u8bf7\u6c42\uff0c\u8f6c\u53d1\u5230\u5176\u4ee3\u7406\u6e90<\/li>\n<li>\u901a\u8fc7\u914d\u7f6enginx\u7684\u914d\u7f6e\u6587\u4ef6\u5b9e\u73b0\u4ee3\u7406\u5230\u4e0d\u540c\u6e90<\/li>\n<\/ul>\n<pre><code class=\"hljs nginx copyable\" lang=\"nginx\">\/\/ nginx.conf\u914d\u7f6e\nserver {\n  listen 80;  \/\/ \u76d1\u542c\u7aef\u53e3\n  server_name  www.baidu.com; \/\/ \u5339\u914d\u6765\u6e90\n  location \/ {  \/\/\u5339\u914d\u8def\u5f84\n    \/\/ \u53cd\u5411\u4ee3\u7406\u5230http:\/\/127.0.0.1:3000\n    proxy_pass http:\/\/127.0.0.1:3000;\n    \/\/ \u9ed8\u8ba4\u5165\u53e3\u6587\u4ef6\n    index  index.html index.htm index.jsp;\n}\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li>nginx\u53cd\u5411\u4ee3\u7406\u8fd8\u80fd\u5b9e\u73b0\u8d1f\u8f7d\u5747\u8861<\/li>\n<\/ul>\n<h2 class=\"heading\" data-id=\"heading-92\"><span id=\"20\">\u4e8c\u5341\u3001setTimeout\u4e0esetInterval<\/span><\/h2>\n<h3 class=\"heading\" data-id=\"heading-93\">setTimeout<\/h3>\n<ul>\n<li>setTimeout\u5c5e\u4e8ewebApi\u7684\u4e00\u90e8\u5206\uff0c\u53ef\u4ee5\u5b9e\u73b0\u5ef6\u65f6\u8c03\u7528\uff0c\u5c5e\u4e8e\u5f02\u6b65\u5b8f\u4efb\u52a1\uff0c\u4e00\u6b21\u6027\u4f7f\u7528<\/li>\n<li><code>setTimeout(func|code, [delay], [arg1], [arg2], ...)<\/code> \u53c2\u65701\u4e3a\u60f3\u8981\u6267\u884c\u7684\u51fd\u6570\u6216\u4ee3\u7801\u5b57\u7b26\u4e32\uff0c\u53c2\u65702\u4e3a\u5ef6\u8fdf\u6267\u884c\u65f6\u95f4\uff0c\u5355\u4f4d\u6beb\u79d2\u9ed8\u8ba40\uff0c\u53c2\u65703\u53ca\u4e4b\u540e\u7684\u53c2\u6570\u4e3a\u53c2\u65701\u4e3a\u51fd\u6570\u65f6\u4f20\u5165\u7684\u53c2\u6570\uff0c\u8c03\u7528\u4e4b\u540e\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5b9a\u65f6\u5668id<\/li>\n<li>\u6b64\u65b9\u6cd5\u53ea\u6267\u884c\u4e00\u6b21\uff0c\u53ef\u4ee5\u4f7f\u7528<code>clearTimeout(id)<\/code>\u6e05\u9664\u5b9a\u65f6\u5668\u6765\u53d6\u6d88\u56de\u8c03<\/li>\n<li>\u770b\u4e00\u4e0bsetTimeout\u7684\u5ef6\u8fdf\u6267\u884c\u673a\u5236<\/li>\n<\/ul>\n<p><\/p><figure><img decoding=\"async\" alt=\"setTimeout\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d57a515531c0?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"1015\" data-height=\"336\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;1015&quot; height=&quot;336&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<ul>\n<li>\u4ee5\u4e0a\u4f7f\u7528\u5d4c\u5957setTimeout\u6765\u5b9e\u73b0\u5faa\u73af\u8c03\u7528\uff0c\u53ef\u4ee5\u4ece\u4e2d\u770b\u51fasetTimeout\u8ba1\u65f6\u662f\u4ece\u4e0a\u4e00\u4e2asetTimeout\u56de\u8c03\u6267\u884c\u4e4b\u540e\u5f00\u59cb\u7684\uff0c\u770b\u770b\u4ee3\u7801\u6548\u679c<\/li>\n<\/ul>\n<p><\/p><figure><img decoding=\"async\" alt=\"setTimeout\u4ee3\u7801\u6f14\u793a\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d57d50d46306?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"841\" data-height=\"324\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;841&quot; height=&quot;324&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<ul>\n<li>\u4e0a\u56fe\u8ba1\u7b97\u7684\u662f2\u6b21\u8c03\u7528\u56de\u8c03\u4e4b\u95f4\u7684\u95f4\u9694\uff0c\u4e0d\u5305\u62ec\u56de\u8c03\u6267\u884c\u65f6\u95f4\uff0c\u53ef\u4ee5\u770b\u51fa\u5728\u5f00\u542f\u5b9a\u65f6\u5668\u4e4b\u540e\u5230\u6267\u884c\u56de\u8c03\u7684\u65f6\u95f4\u786e\u5b9e\u662f\u53c2\u65702\u6240\u8bbe\u7f6e\u7684\u503c\uff0c\u5ef6\u8fdf\u65f6\u95f4\u4e0e\u56de\u8c03\u51fd\u6570\u6267\u884c\u65f6\u95f4\u65e0\u5173\uff1b<\/li>\n<li>\u7b80\u5355\u6765\u8bb2setTimeout\u7684\u5ef6\u8fdf\u65f6\u95f4\u4e0d\u5305\u62ec\u81ea\u8eab\u56de\u8c03\u6240\u5360\u7528\u7684\u65f6\u95f4<\/li>\n<\/ul>\n<p>\u4e5f\u5c31\u662f\u8bf4setTimeout\u662f\u5728\u4e0a\u4e00\u6b21\u56de\u8c03\u6267\u884c\u4e4b\u540e\u624d\u5f00\u542f\u7684\u5b9a\u65f6<\/p>\n<h3 class=\"heading\" data-id=\"heading-94\">setInterval<\/h3>\n<ul>\n<li>setInterval\u540c\u6837\u4e5f\u662fwebApi\u7684\u4e00\u90e8\u5206\uff0c\u4e3b\u8981\u7528\u6765\u5b9a\u65f6\u5faa\u73af\u6267\u884c\u4ee3\u7801<\/li>\n<li>\u4e0d\u540c\u4e8esetTimeout\uff0c\u6b64\u5b9a\u65f6\u5668\u7684\u5ef6\u8fdf\u6267\u884c\u673a\u5236\u6709\u6240\u4e0d\u540c<\/li>\n<li><code>setInterval(func|code, [delay], [arg1], [arg2], ...)<\/code>\uff0c\u53c2\u6570\u5217\u8868\u540csetTimeout\uff0c\u53c2\u65702\u4e3a\u6bcf\u6b21\u5faa\u73af\u65f6\u95f4<\/li>\n<\/ul>\n<p><\/p><figure><img decoding=\"async\" alt=\"setInterval\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d5823cbd8652?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"1015\" data-height=\"318\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;1015&quot; height=&quot;318&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<ul>\n<li>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u5148\u5f97\u51fa\u7ed3\u8bba\uff0csetInterval\u7684\u5ef6\u8fdf\u6267\u884c\u65f6\u95f4\u5305\u542b\u81ea\u8eab\u56de\u8c03\u6267\u884c\u6240\u5360\u7528\u7684\u65f6\u95f4\uff0c\u770b\u770b\u4ee3\u7801\u6548\u679c<\/li>\n<\/ul>\n<p><\/p><figure><img decoding=\"async\" alt=\"setInterval\u4ee3\u7801\u6f14\u793a\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d586296026d8?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"839\" data-height=\"301\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;839&quot; height=&quot;301&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<ul>\n<li>\u4e0a\u56fe\u8ba1\u7b97\u7684\u662f2\u6b21\u8c03\u7528\u56de\u8c03\u4e4b\u95f4\u7684\u95f4\u9694\uff0c\u4e0d\u5305\u62ec\u56de\u8c03\u6267\u884c\u65f6\u95f4\uff0c\u53ef\u4ee5\u770b\u51fasetInterval\u57282\u6b21\u6267\u884c\u4e4b\u95f4\u7684\u5ef6\u8fdf\u53d7\u5230\u4e86\u56de\u8c03\u7684\u5f71\u54cd\uff0c\u518d\u9a8c\u8bc1\u4e00\u4e0b<\/li>\n<\/ul>\n<p><\/p><figure><img decoding=\"async\" alt=\"setInterval\u4ee3\u7801\u6f14\u793a1\" class=\"lazyload inited\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d58a248e5cd3?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"842\" data-height=\"300\" src=\"data:image\/svg+xml;utf8,<?xml version=&quot;1.0&quot;?><svg xmlns=&quot;http:\/\/www.w3.org\/2000\/svg&quot; version=&quot;1.1&quot; width=&quot;842&quot; height=&quot;300&quot;><\/svg>&#8220;><figcaption><\/figcaption><\/figure><p><\/p>\n<ul>\n<li>\u6b64\u6b21\u6211\u628a\u56de\u8c03\u6267\u884c\u65f6\u95f4\u4e5f\u7b97\u5728\u8ba1\u65f6\u4e4b\u5185\uff0c\u73b0\u5728\u770b\u6765setInterval\u7684\u5b9a\u65f6\u65f6\u95f4\u786e\u5b9e\u5305\u542b\u4e86\u81ea\u8eab\u56de\u8c03\u6240\u5360\u7528\u7684\u65f6\u95f4<\/li>\n<\/ul>\n<p>\u7531\u4e8e\u8fd92\u4e2aapi\u90fd\u5c5e\u4e8e\u5f02\u6b65\u5b8f\u4efb\u52a1\uff0c\u5728\u6267\u884c\u7684\u65f6\u5019\u90fd\u4f1a\u8fdb\u5165\u4efb\u52a1\u961f\u5217\uff0c\u5982\u679c\u961f\u5217\u524d\u7684\u4efb\u52a1\u6267\u884c\u65f6\u95f4\u8f83\u957f\uff0c\u90a3\u4e48\u4e5f\u4f1a\u5f71\u54cd\u5230\u5b9a\u65f6\u5668\u7684\u6267\u884c\u65f6\u673a<\/p>\n<p>\u5728\u6d4f\u89c8\u5668\u4e2dalert\u3001confirm\u3001prompt\u90fd\u4f1a\u963b\u585ejs\u4e3b\u7ebf\u7a0b\u6267\u884c\uff0c\u76f4\u5230\u5f39\u7a97\u6d88\u5931\uff0c\u4f46\u662f\u5b9a\u65f6\u5668\u8fd8\u4f1a\u7ee7\u7eed\u6267\u884c\uff1b\u5b9a\u65f6\u5668\u5e76\u4e0d\u80fd\u8fbe\u52300\u5ef6\u8fdf\uff0c\u6700\u5c0f\u5ef6\u8fdf\u9650\u5236\u57284ms<\/p>\n<h2 class=\"heading\" data-id=\"heading-95\"><span id=\"21\">\u4e8c\u5341\u4e00\u3001requestAnimationFrame<\/span><\/h2>\n<ul>\n<li>\u5728requestAnimationFrame\u8fd8\u672a\u51fa\u6765\u4e4b\u524d\uff0c\u5927\u591a\u6570\u4f7f\u7528\u5b9a\u65f6\u5668\u5b8c\u6210js\u52a8\u753b\uff0c\u4f46\u662f\u7531\u4e8e\u5b9a\u65f6\u5668\u4e0d\u51c6\u786e\uff0c\u800c\u4e14\u6bcf\u6b21\u66f4\u65b0\u52a8\u753b\u7684\u65f6\u5019\u4e0d\u80fd\u4fdd\u8bc1\u4e0e\u6d4f\u89c8\u5668\u6e32\u67d3\u540c\u6b65\uff0c\u8fd9\u6837\u5c06\u4f1a\u5bfc\u81f4\u753b\u9762\u7684\u4e0d\u6d41\u7545<\/li>\n<li>\u7531\u4e8e\u76ee\u524d\u4e3b\u6d41\u5c4f\u5e55\u7684\u56fa\u5b9a\u5237\u65b0\u9891\u7387\u4e00\u822c\u4e3a60HZ\u5373\u4e00\u79d260\u5e27\uff0c\u6bcf\u6b21\u5237\u65b0\u95f4\u9694\u4e3a1000\/60ms\uff0c\u4e3a\u4e86\u4f7f\u6d4f\u89c8\u5668\u5f97\u5230\u6700\u597d\u7684\u6e32\u67d3\u6548\u679c\uff0c\u6d4f\u89c8\u5668\u6bcf\u6b21\u6e32\u67d3\u5e94\u8be5\u4e0e\u5c4f\u5e55\u5237\u65b0\u7387\u4fdd\u6301\u4e00\u81f4\uff0c\u90a3\u4e48\u5bf9\u4e8ejs\u52a8\u753b\u800c\u8a00\uff0c\u6700\u597d\u7684\u66f4\u65b0\u65f6\u673a\u5e94\u8be5\u4e0e\u6d4f\u89c8\u5668\u5c3d\u91cf\u4fdd\u6301\u4e00\u81f4<\/li>\n<li>\u5f53\u6bcf\u6b21\u6d4f\u89c8\u5668\u5c06\u8981\u91cd\u7ed8\u4e4b\u524d\uff0c\u628a\u8981\u6267\u884c\u66f4\u65b0\u7684\u52a8\u753b\u66f4\u65b0\u5b8c\u6210\uff0c\u90a3\u4e48\u5f53\u6d4f\u89c8\u5668\u6e32\u67d3\u7684\u65f6\u5019\u5c06\u4f1a\u4fdd\u6301\u6700\u65b0\u7684\u52a8\u753b\uff0c\u8fd9\u5c31\u662frequestAnimationFrame\u6240\u505a\u7684\u4e8b\u60c5<\/li>\n<li><code>requestAnimationFrame(callback)<\/code> \u7684\u53c2\u6570\u5c31\u662f\u6bcf\u6b21\u6e32\u67d3\u524d\u9700\u8981\u6267\u884c\u7684\u52a8\u753b\u66f4\u65b0\u51fd\u6570\uff0c\u5f53\u6d4f\u89c8\u5668\u5c06\u8981\u91cd\u7ed8\u753b\u9762\u65f6\u5c31\u4f1a\u6267\u884c\u8fd9\u4e2a\u56de\u8c03\u51fd\u6570\uff0c\u8fd9\u4e2a\u56de\u8c03\u51fd\u6570\u63a5\u53d7\u4e00\u4e2a\u53c2\u6570\uff0c\u5373\u4ece\u5f53\u524d\u9875\u9762\u52a0\u8f7d\u4e4b\u540e\u5230\u73b0\u5728\u6240\u7ecf\u8fc7\u7684\u6beb\u79d2\u6570<\/li>\n<li>\u6b64api\u5c06\u4f1a\u4e0e\u6d4f\u89c8\u5668\u6e32\u67d3\u540c\u6b65\uff0c\u5373\u6d4f\u89c8\u5668\u6e32\u67d3\u51e0\u6b21\u8fd9\u4e2aapi\u5c06\u4f1a\u6267\u884c\u51e0\u6b21\uff0c\u90a3\u4e48\u5c31\u8fbe\u5230\u4e86\u4e0d\u6389\u5e27\u7684\u6548\u679c\uff0c\u753b\u9762\u6548\u679c\u5c31\u66f4\u52a0\u6d41\u7a0b<\/li>\n<li>requestAnimationFrame\u6267\u884c\u65f6\u673a\u5728\u4e8b\u4ef6\u5faa\u73af\u673a\u5236\u4e2d\u5904\u4e8e\u5fae\u4efb\u52a1\u961f\u5217\u4e4b\u540e\uff0c\u6d4f\u89c8\u5668\u6e32\u67d3\u4e4b\u524d\uff0c\u6d4f\u89c8\u5668\u6e32\u67d3\u4e4b\u540e\u5c31\u4f1a\u8fdb\u5165\u4e0b\u4e00\u6b21\u7684\u4e8b\u4ef6\u5faa\u73af(\u5b8f\u4efb\u52a1\u5f00\u59cb\uff0c\u6d4f\u89c8\u5668\u6e32\u67d3\u7ed3\u675f)<\/li>\n<li>\u5982\u679c\u4f7f\u7528\u5b9a\u65f6\u5668\u8fdb\u884cjs\u52a8\u753b\u64cd\u4f5c\uff0c\u90a3\u4e48\u9996\u5148\u5c06\u4f1a\u5bfc\u81f4\u52a8\u753b\u66f4\u65b0\u4e0e\u6d4f\u89c8\u5668\u6bcf\u6b21\u91cd\u7ed8\u65f6\u673a\u4e0d\u5339\u914d\uff0c\u9020\u6210\u5361\u987f\uff0c\u5176\u6b21\u8fc7\u4e8e\u9891\u7e41\u7684\u66f4\u65b0\u52a8\u753b\u8fd8\u4f1a\u5bfc\u81f4\u4e0d\u5fc5\u8981\u7684\u6027\u80fd\u5f00\u9500\uff0c\u4e14\u5e76\u975e\u80fd\u591f\u8fbe\u5230\u66f4\u597d\u7684\u6548\u679c<\/li>\n<li>\u7b80\u5355\u8bf4\u4f7f\u7528requestAnimationFrame\u66f4\u65b0\u7684\u52a8\u753b\u4e0e\u6d4f\u89c8\u5668\u4fdd\u6301\u540c\u6b65\uff0c\u4e0d\u4f1a\u6389\u5e27\uff0c\u9664\u975e\u6d4f\u89c8\u5668\u6389\u5e27\u6216\u8005\uff0cjs\u4e3b\u7ebf\u7a0b\u963b\u585e\u5bfc\u81f4\u6d4f\u89c8\u5668\u65e0\u6cd5\u6b63\u5e38\u6e32\u67d3\uff0c\u4f7f\u7528\u5b9a\u65f6\u5668\u66f4\u65b0\u52a8\u753b\uff0c\u5982\u679c\u9891\u7387\u9ad8\u4e86\u4f1a\u5f71\u54cd\u6027\u80fd\uff0c\u4e14\u8fbe\u4e0d\u5230\u66f4\u597d\u7684\u6548\u679c\uff0c\u5982\u679c\u9891\u7387\u4f4e\u4e86\u5c06\u4f1a\u6709\u4e0d\u8fde\u8d2f\u7684\u611f\u89c9<\/li>\n<\/ul>\n<p><\/p><figure><img decoding=\"async\" alt=\"requestAnimationFrame\" class=\"lazyload inited loaded\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d58f7ddf9656?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"802\" data-height=\"224\" src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d58f7ddf9656?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\"><figcaption><\/figcaption><\/figure><p><\/p>\n<ul>\n<li>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u51fa\u786e\u5b9e\u662f\u6bcf\u5e27\u6267\u884c\u4e00\u6b21\uff0c\u4e0d\u8fc7\u8981\u6ce8\u610f\uff0c\u8c03\u7528\u4e00\u6b21requestAnimationFrame\u53ea\u4f1a\u6267\u884c\u4e00\u6b21\uff0c\u5982\u679c\u9700\u8981\u6301\u7eed\u6267\u884c\u9700\u8981\u5728\u56de\u8c03\u51fd\u6570\u5185\u7ee7\u7eed\u8c03\u7528<\/li>\n<\/ul>\n<h2 class=\"heading\" data-id=\"heading-96\"><span id=\"22\">\u4e8c\u5341\u4e8c\u3001\u4e8b\u4ef6<\/span><\/h2>\n<h3 class=\"heading\" data-id=\"heading-97\">DOM0\u4e8b\u4ef6<\/h3>\n<ul>\n<li>DOM0\u4e8b\u4ef6\u5e76\u975ew3c\u6807\u51c6\uff0c\u5728DOM\u6807\u51c6\u5f62\u6210\u4e4b\u524d\u7684\u4e8b\u4ef6\u6a21\u578b\u5c31\u662f\u6211\u4eec\u6240\u8bf4\u76840\u7ea7DOM<\/li>\n<li>\u6dfb\u52a0DOM0\u4e8b\u4ef6\uff0c\u90fd\u662f\u628a\u4e00\u4e2a\u51fd\u6570\u8d4b\u503c\u7ed9\u6587\u6863\u5143\u7d20\uff0c\u5728\u4e8b\u4ef6\u76d1\u542c\u51fd\u6570\u88ab\u8c03\u7528\u65f6\uff0c\u5c06\u4f1a\u505a\u4e3a\u4ea7\u751f\u4e8b\u4ef6\u7684\u5143\u7d20\u65b9\u6cd5\u8c03\u7528\uff0c\u6240\u4ee5this\u6307\u5411\u76ee\u6807\u5143\u7d20\uff0c\u7b80\u5355\u8bf4\u5c31\u662f\u76f4\u63a5\u628a\u56de\u8c03\u51fd\u6570\u4f5c\u4e3a\u6587\u6863\u5143\u7d20\u7684\u4e00\u4e2a\u65b9\u6cd5\u8c03\u7528<\/li>\n<li>\u5220\u9664DOM0\u4e8b\u4ef6\u53ea\u9700\u628a\u4e8b\u4ef6\u8d4b\u503c\u4e3anull\u5373\u53ef<\/li>\n<\/ul>\n<pre><code class=\"hljs DOM0 copyable\" lang=\"DOM0\">document.getElementById(\"btn\").onclick = function () {}\n----------------------------------------------\n&lt;input type=\"button\" onclick=\"alert('hi!');\"&gt;\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li>\u5982\u679c\u56de\u8c03\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2afalse\u5219\u4f1a\u963b\u6b62\u6d4f\u89c8\u5668\u4e8b\u4ef6\u7684\u9ed8\u8ba4\u884c\u4e3a<\/li>\n<li>DOM0\u4e8b\u4ef6\u5728\u4e8b\u4ef6\u6355\u83b7\u9636\u6bb5\uff0c\u65e0\u6cd5\u63a5\u6536\u4e8b\u4ef6\uff0c\u5373\u6ca1\u65e0\u6cd5\u89e6\u53d1\u4e8b\u4ef6\u6355\u83b7\uff0c\u4f46\u662f\u80fd\u591f\u6b63\u5e38\u89e6\u53d1\u5192\u6ce1<\/li>\n<li>\u7531\u4e8eDOM0\u4e8b\u4ef6\u7684\u56de\u8c03\u5c5e\u4e8e\u6587\u6863\u5143\u7d20\u7684\u65b9\u6cd5\uff0c\u5bfc\u81f4\u65e0\u6cd5\u6dfb\u52a0\u591a\u4e2a\u540c\u540d\u4e8b\u4ef6\uff0c\u4e0d\u8fc7\u770b\u6765\u517c\u5bb9\u6027\u6700\u597d<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-98\">DOM2\u4e8b\u4ef6<\/h3>\n<ul>\n<li>\u7531\u4e8ew3c\u63a8\u51fa\u76841\u7ea7DOM\u6807\u51c6\u4e2d\u5e76\u6ca1\u6709\u5b9a\u4e49\u4e8b\u4ef6\u76f8\u5173\u7684\u5185\u5bb9\uff0c\u6240\u4ee5\u6ca1\u6709\u6240\u8c13\u76841\u7ea7DOM\u4e8b\u4ef6\u6a21\u578b<\/li>\n<li>\u57282\u7ea7DOM\u4e2d\u9664\u4e86\u5b9a\u4e49\u4e86\u4e00\u4e9bDOM\u76f8\u5173\u7684\u64cd\u4f5c\u4e4b\u5916\u8fd8\u5b9a\u4e49\u4e86\u4e00\u4e2a\u4e8b\u4ef6\u6a21\u578b \uff0c\u8fd9\u4e2a\u6807\u51c6\u4e0b\u7684\u4e8b\u4ef6\u6a21\u578b\u5c31\u662f\u6211\u4eec\u6240\u8bf4\u76842\u7ea7DOM\u4e8b\u4ef6\u6a21\u578b<\/li>\n<li>2\u7ea7DOM\u5b9a\u4e49\u4e86\u4e8b\u4ef6\u4f20\u64ad\uff0c\u5728\u4e8b\u4ef6\u4f20\u64ad\u8fc7\u7a0b\u4e2d\u5c06\u4f1a\u7ecf\u53863\u4e2a\u9636\u6bb5\uff1a\n<ol>\n<li>capturing\u9636\u6bb5\uff0c\u5373\u4e8b\u4ef6\u6355\u83b7\u9636\u6bb5\uff0c\u5728\u67d0\u4e2aDOM\u4e0a\u89e6\u53d1\u4e8b\u4ef6\u65f6\uff0c\u4e8b\u4ef6\u4f1a\u5148\u4eceDocument\u5bf9\u8c61 \u6cbf\u7740dom\u6570\u5411\u4e0b\u4f20\u9012\u76f4\u5230\u89e6\u53d1\u8282\u70b9\uff0c\u6b64\u8fc7\u7a0b\u5c31\u662f\u4e8b\u4ef6\u6355\u83b7\u9636\u6bb5\uff0c\u5728\u6b64\u8fc7\u7a0b\u4e2d\u53ef\u4ee5\u6355\u83b7\u4f20\u64ad\u7684\u4e8b\u4ef6<\/li>\n<li>\u76ee\u6807\u5143\u7d20\u7684\u4e8b\u4ef6\u5904\u7406\u9636\u6bb5\uff0c\u6b64\u9636\u6bb5\u4e8b\u4ef6\u5230\u8fbe\u89e6\u53d1\u76ee\u6807\uff0c\u8c03\u7528\u56de\u8c03\u5904\u7406\u4e8b\u4ef6<\/li>\n<li>bubbling\u9636\u6bb5\uff0c\u5373\u4e8b\u4ef6\u5192\u6ce1\u9636\u6bb5\uff0c\u5728\u76ee\u6807\u5143\u7d20\u5904\u7406\u5b8c\u6210\u4e4b\u540e\uff0c\u6b64\u4e8b\u4ef6\u8fd8\u4f1a\u5411\u4e0a\u5192\u6ce1\uff0c\u56de\u4f20\u5230Document\uff0c\u6b64\u9636\u6bb5\u4e0e\u6355\u83b7\u9636\u6bb5\u76f8\u53cd<\/li>\n<\/ol>\n<\/li>\n<li>\u4ee5\u4e0a\u5c31\u662f\u4e8b\u4ef6\u5728\u89e6\u53d1\u4e4b\u540e\u7684\u4f20\u64ad\u8fc7\u7a0b\uff0c\u53ef\u4ee5\u914d\u5408\u4e0b\u56fe\u7406\u89e3<\/li>\n<\/ul>\n<p><\/p><figure><img decoding=\"async\" alt=\"\u4e8b\u4ef6\u4f20\u9012\" class=\"lazyload inited loaded\" data-src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d595e0ad539a?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\" data-width=\"842\" data-height=\"493\" src=\"https:\/\/user-gold-cdn.xitu.io\/2020\/4\/21\/1719d595e0ad539a?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\"><figcaption><\/figcaption><\/figure><p><\/p>\n<ul>\n<li>DOM2 \u6ce8\u518c\u4e8b\u4ef6\uff0c\u53ef\u4ee5\u901a\u8fc7<code>addEventListener(eventName,callback,isCapturing)<\/code>\u65b9\u6cd5\u4e3a\u5143\u7d20\u8bbe\u7f6e\u4e8b\u4ef6\u76d1\u542c\u5668\uff0c\u53c2\u65701\u4e3a\u6ce8\u518c\u4e8b\u4ef6\u540d\u4e0d\u5e26on\u5f00\u5934\u7684string\u7c7b\u578b\uff0c\u53c2\u65702\u4e3a\u89e6\u53d1\u4e8b\u4ef6\u7684\u56de\u8c03\u51fd\u6570\uff0c\u63a5\u53d7\u4e00\u4e2a\u4e8b\u4ef6\u5bf9\u8c61\u53c2\u6570\uff0c\u53c2\u65703\u4e3a\u662f\u5426\u5728\u6355\u83b7\u9636\u6bb5\u89e6\u53d1\uff0c\u9ed8\u8ba4\u4e3afalse<\/li>\n<li>\u901a\u8fc7<code>removeEventListener(eventName,callback,isCapturing)<\/code>\u65b9\u6cd5\u79fb\u9664\u6307\u5b9a\u4e8b\u4ef6\u540d\u3001\u56de\u8c03\u3001\u662f\u5426\u6355\u83b7\u7684\u4e8b\u4ef6\uff0c\u533f\u540d\u56de\u8c03\u65e0\u6cd5\u5220\u9664<\/li>\n<li>\u53ef\u7ed9\u4e00\u4e2a\u5143\u7d20\u6dfb\u52a0\u591a\u4e2a\u76f8\u540c\u7684\u4e8b\u4ef6\uff0c\u901a\u8fc7\u4e0d\u540c\u7684\u56de\u8c03\u5b9e\u73b0\u4e0d\u540c\u6548\u679c<\/li>\n<li>DOM2\u4e2d\u7684\u56de\u8c03\u51fd\u6570\u4e2d\u7684this\u6307\u5411\uff0c\u7531\u6d4f\u89c8\u5668\u51b3\u5b9a\uff0cw3c\u6807\u51c6\u4e2d\u5e76\u672a\u89c4\u5b9a\u5176\u6307\u5411\uff0c\u4e00\u822c\u60c5\u51b5this\u6307\u5411window<\/li>\n<li>\u56de\u8c03\u51fd\u6570event\u5bf9\u8c61\u53c2\u6570<\/li>\n<li>\u5c5e\u6027\n<ul>\n<li>type \u53d1\u751f\u4e8b\u4ef6\u7684\u7c7b\u578b<\/li>\n<li>target \u53d1\u751f\u4e8b\u4ef6\u7684\u9636\u6bb5\uff0c\u4e3a\u89e6\u53d1\u4e8b\u4ef6\u7684\u5bf9\u8c61\uff0c\u53ef\u4ee5\u4e0ecurrentTarget\u4e0d\u540c<\/li>\n<li>currentTarget \u6b63\u5728\u5904\u7406\u4e8b\u4ef6\u7684\u8282\u70b9\uff0c\u5373\u6ce8\u518c\u6b64\u56de\u8c03\u51fd\u6570\u7684\u5143\u7d20<\/li>\n<li>clientX\uff0cclientY\u9f20\u6807\u76f8\u5bf9\u6d4f\u89c8\u5668\u7684x\u5750\u6807\u4e0ey\u5750\u6807<\/li>\n<li>screenX\uff0cscreenY\u9f20\u6807\u76f8\u5bf9\u4e8e\u663e\u793a\u5668\u5de6\u4e0a\u89d2x\uff0cy\u5750\u6807<\/li>\n<\/ul>\n<\/li>\n<li>\u65b9\u6cd5\n<ul>\n<li>stopPropagation() \u963b\u6b62\u5f53\u524d\u4e8b\u4ef6\u7684\u8fdb\u4e00\u6b65\u4f20\u64ad<\/li>\n<li>preventDefault() \u963b\u6b62\u6d4f\u89c8\u5668\u6267\u884c\u4e0e\u4e16\u754c\u76f8\u5173\u7684\u9ed8\u8ba4\u52a8\u4f5c\uff0c\u4e0eDOM0\u8fd4\u56defalse\u76f8\u540c<\/li>\n<\/ul>\n<\/li>\n<li>\u89e6\u53d1\u65f6\u673a\n<ul>\n<li>document \u5f80 target\u8282\u70b9\u4f20\u64ad\uff0c\u6355\u83b7\u524d\u8fdb\uff0c\u9047\u5230\u6ce8\u518c\u7684\u6355\u83b7\u4e8b\u4ef6\u7acb\u5373\u89e6\u53d1\u6267\u884c<\/li>\n<li>\u5230\u8fbetarget\u8282\u70b9\uff0c\u89e6\u53d1\u4e8b\u4ef6\uff08\u5bf9\u4e8etarget\u8282\u70b9\u4e0a\uff0c\u662f\u5148\u6355\u83b7\u8fd8\u662f\u5148\u5192\u6ce1\u5219\u6355\u83b7\u4e8b\u4ef6\u548c\u5192\u6ce1\u4e8b\u4ef6\u7684\u6ce8\u518c\u987a\u5e8f\uff0c\u5148\u6ce8\u518c\u5148\u6267\u884c\uff09<\/li>\n<li>target\u8282\u70b9 \u5f80 document \u65b9\u5411\u4f20\u64ad\uff0c\u5192\u6ce1\u524d\u8fdb\uff0c\u9047\u5230\u6ce8\u518c\u7684\u5192\u6ce1\u4e8b\u4ef6\u7acb\u5373\u89e6\u53d1<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 class=\"heading\" data-id=\"heading-99\">\u4e8b\u4ef6\u4ee3\u7406<\/h3>\n<ul>\n<li>\u4e8b\u4ef6\u4ee3\u7406\u53c8\u6216\u662f\u4e8b\u4ef6\u59d4\u6258\uff0c\u901a\u8fc7\u4e8b\u4ef6\u5192\u6ce1\u673a\u5236\uff0c\u4f7f\u7528\u5355\u4e00\u7236\u8282\u70b9\u6765\u64cd\u4f5c\u591a\u4e2a\u5b50\u8282\u70b9\u7684\u54cd\u5e94\uff0c\u7b80\u5355\u8bb2\u5c31\u662f\u628a\u6240\u6709\u5b50\u8282\u70b9\u7684\u4e8b\u4ef6\u53bb\u9664\uff0c\u53ea\u7ed9\u7236\u8282\u70b9\u6ce8\u518c\u4e8b\u4ef6\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u901a\u8fc7\u4e8b\u4ef6\u5192\u6ce1\u673a\u5236\u6765\u5904\u7406\u5b50\u8282\u70b9\u7684\u54cd\u5e94<\/li>\n<li>\u57fa\u4e8e\u4e8b\u4ef6\u59d4\u6258\u53ef\u4ee5\u51cf\u5c11\u4e8b\u4ef6\u6ce8\u518c\uff0c\u8282\u7701\u5185\u5b58\uff0c\u7b80\u5316dom\u8282\u70b9\u4e8e\u4e8b\u4ef6\u7684\u66f4\u65b0<\/li>\n<\/ul>\n<pre><code class=\"hljs \u4e8b\u4ef6\u59d4\u6258 copyable\" lang=\"\u4e8b\u4ef6\u59d4\u6258\">&lt;ul id=\"f\"&gt;\n  &lt;li&gt;a&lt;\/li&gt;\n  &lt;li&gt;b&lt;\/li&gt;\n  &lt;li&gt;c&lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;script&gt;\n  const ul = document.querySelector('#f')\n  \/\/ \u70b9\u51fbli\u65f6\u89e6\u53d1\u4e8b\u4ef6\u59d4\u6258\n  ul.addEventListener('click',function foo(event){\n    \/\/ \u5904\u7406\u5143\u7d20\u4e3a\u7236\u5143\u7d20\n    console.dir(event.currentTarget)  \/\/ ul#f\n    \/\/ \u89e6\u53d1\u5143\u7d20\u4e3a\u5b50\u5143\u7d20\uff0cevent.target\u4e3a\u5177\u4f53\u89e6\u53d1\u5bf9\u8c61\n    console.dir(event.target)         \/\/ li\n  })\n\/\/--------------------------------------------\n  \/\/ \u901a\u8fc7\u70b9\u51fb\u6dfb\u52a0\u5b50\u5143\u7d20\n  ul.addEventListener('click',function foo(event){\n    const child = document.createElement('li')\n    child.innerText = '\u6211\u662f\u65b0\u589e\u7684\u5b50\u5143\u7d20'\n    event.currentTarget.appendChild(child)\n  })\n\/\/--------------------------------------------\n  \/\/ \u901a\u8fc7\u70b9\u51fb\u5220\u9664\u5b50\u5143\u7d20\n  ul.addEventListener('click',function foo(event){\n    event.currentTarget.removeChild(event.target)\n  })\n&lt;\/script&gt;\n----------------------------------------------\n&lt;!-- \u5982\u679c\u70b9\u51fbspan \u60f3\u77e5\u9053\u662f\u54ea\u4e2ali\u4e0b\u9762\u7684\u5143\u7d20 --&gt;\n&lt;ul id=\"f\"&gt;\n  &lt;li&gt;a&lt;\/li&gt;\n  &lt;li&gt;\n    &lt;span&gt;b&lt;\/span&gt;\n  &lt;\/li&gt;\n  &lt;li&gt;\n    &lt;span&gt;c&lt;\/span&gt;\n  &lt;\/li&gt;\n&lt;\/ul&gt;\n&lt;script&gt;\n  const ul = document.querySelector('#f')\n  ul.addEventListener('click', function foo(event) {\n    let target = event.target\n    \/\/ \u4e00\u7ea7\u7ea7\u5411\u4e0a\u5bfb\u627e\u76f4\u5230\u627e\u5230\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7d20\n    while (target.nodeName.toLowerCase() !== 'li') {\n      target.target.parentNode\n    }\n    console.dir(target) \/\/ li\n    console.dir(target.parentNode === event.currentTarget) \/\/true\n  })\n&lt;\/script&gt;\n<span class=\"copy-code-btn\">\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre><ul>\n<li>\u4ee5\u4e0a\u5c31\u662f\u51e0\u4e2a\u7b80\u5355\u7684\u4e8b\u4ef6\u4ee3\u7406\u7684\u4f8b\u5b50\uff0c\u4e8b\u4ef6\u4ee3\u7406\u80fd\u591f\u5728\u6211\u4eec\u5e73\u65f6\u5f00\u53d1\u4e2d\u51cf\u5c11\u5f88\u591a\u4e0d\u5fc5\u8981\u7684\u4ee3\u7801\uff0c\u4f18\u5316\u4e8b\u4ef6\u7cfb\u7edf\uff0c\u4f46\u662f\u5728\u4f7f\u7528\u7684\u8fc7\u7a0b\u4e5f\u8981\u6ce8\u610f\u76f8\u5e94\u7684\u95ee\u9898<\/li>\n<li>\u4e8b\u4ef6\u4ee3\u7406\u57fa\u4e8e\u5192\u6ce1\u673a\u5236\uff0c\u5982\u679c\u4ee3\u7406\u5c42\u7ea7\u8fc7\u591a\uff0c\u4e14\u5728\u5192\u6ce1\u9636\u6bb5\u5982\u679c\u88ab\u67d0\u5c42\u963b\u6b62\u5192\u6ce1\u90a3\u4e48\u7236\u7ea7\u5c06\u4e0d\u4f1a\u6536\u5230\u4e8b\u4ef6<\/li>\n<li>\u7406\u8bba\u4e0a\u59d4\u6258\u4f1a\u5bfc\u81f4\u6d4f\u89c8\u5668\u9891\u7e41\u8c03\u7528\u5904\u7406\u51fd\u6570\uff0c\u867d\u7136\u5f88\u53ef\u80fd\u4e0d\u9700\u8981\u5904\u7406\uff0c\u6240\u4ee5\u5efa\u8bae\u5c31\u8fd1\u59d4\u6258<\/li>\n<li>\u5982\u679c\u4e8b\u4ef6\u4ee3\u7406\u4e86\u8bb8\u591a\u60c5\u51b5\u90a3\u4e48\u8981\u505a\u597d\u5b8c\u5584\u903b\u8f91\u5206\u6790\uff0c\u907f\u514d\u4e00\u4e9b\u8bef\u5224\u7684\u60c5\u51b5<\/li>\n<\/ul>\n<h2 class=\"heading\" data-id=\"heading-100\"><span 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