{"id":159,"date":"2019-09-19T10:34:52","date_gmt":"2019-09-19T02:34:52","guid":{"rendered":"http:\/\/blog.adeying.com\/?p=159"},"modified":"2019-09-19T10:35:06","modified_gmt":"2019-09-19T02:35:06","slug":"159","status":"publish","type":"post","link":"https:\/\/adeqing.com\/index.php\/2019\/09\/19\/default\/159\/","title":{"rendered":"\u524d\u7aef\u7ecf\u5178\u9762\u8bd5\u9898(60\u9053\u524d\u7aef\u9762\u8bd5\u9898\u5305\u542bJS\u3001CSS\u3001React\u3001\u7f51\u7edc\u3001\u6d4f\u89c8\u5668\u3001\u7a0b\u5e8f\u9898\u7b49)"},"content":{"rendered":"<h3 id=\"articleHeader1\">1\u3001\u4ec0\u4e48\u662f\u9632\u6296\u548c\u8282\u6d41\uff1f\u6709\u4ec0\u4e48\u533a\u522b\uff1f\u5982\u4f55\u5b9e\u73b0\uff1f<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p><strong>\u9632\u6296<\/strong><\/p>\n<blockquote><p>\u89e6\u53d1\u9ad8\u9891\u4e8b\u4ef6\u540en\u79d2\u5185\u51fd\u6570\u53ea\u4f1a\u6267\u884c\u4e00\u6b21\uff0c\u5982\u679cn\u79d2\u5185\u9ad8\u9891\u4e8b\u4ef6\u518d\u6b21\u88ab\u89e6\u53d1\uff0c\u5219\u91cd\u65b0\u8ba1\u7b97\u65f6\u95f4<\/p><\/blockquote>\n<ul>\n<li>\u601d\u8def\uff1a<\/li>\n<\/ul>\n<blockquote><p>\u6bcf\u6b21\u89e6\u53d1\u4e8b\u4ef6\u65f6\u90fd\u53d6\u6d88\u4e4b\u524d\u7684\u5ef6\u65f6\u8c03\u7528\u65b9\u6cd5<\/p><\/blockquote>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">debounce<\/span>(<span class=\"hljs-params\">fn<\/span>) <\/span>{\r\n      <span class=\"hljs-keyword\">let<\/span> timeout = <span class=\"hljs-literal\">null<\/span>; <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u4e00\u4e2a\u6807\u8bb0\u7528\u6765\u5b58\u653e\u5b9a\u65f6\u5668\u7684\u8fd4\u56de\u503c<\/span>\r\n      <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> () <\/span>{\r\n        clearTimeout(timeout); <span class=\"hljs-comment\">\/\/ \u6bcf\u5f53\u7528\u6237\u8f93\u5165\u7684\u65f6\u5019\u628a\u524d\u4e00\u4e2a setTimeout clear \u6389<\/span>\r\n        timeout = setTimeout(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> { <span class=\"hljs-comment\">\/\/ \u7136\u540e\u53c8\u521b\u5efa\u4e00\u4e2a\u65b0\u7684 setTimeout, \u8fd9\u6837\u5c31\u80fd\u4fdd\u8bc1\u8f93\u5165\u5b57\u7b26\u540e\u7684 interval \u95f4\u9694\u5185\u5982\u679c\u8fd8\u6709\u5b57\u7b26\u8f93\u5165\u7684\u8bdd\uff0c\u5c31\u4e0d\u4f1a\u6267\u884c fn \u51fd\u6570<\/span>\r\n          fn.apply(<span class=\"hljs-keyword\">this<\/span>, <span class=\"hljs-built_in\">arguments<\/span>);\r\n        }, <span class=\"hljs-number\">500<\/span>);\r\n      };\r\n    }\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">sayHi<\/span>() <\/span>{\r\n      <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'\u9632\u6296\u6210\u529f'<\/span>);\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">var<\/span> inp = <span class=\"hljs-built_in\">document<\/span>.getElementById(<span class=\"hljs-string\">'inp'<\/span>);\r\n    inp.addEventListener(<span class=\"hljs-string\">'input'<\/span>, debounce(sayHi)); <span class=\"hljs-comment\">\/\/ \u9632\u6296<\/span><\/code><\/pre>\n<p><strong>\u8282\u6d41<\/strong><\/p>\n<blockquote><p>\u9ad8\u9891\u4e8b\u4ef6\u89e6\u53d1\uff0c\u4f46\u5728n\u79d2\u5185\u53ea\u4f1a\u6267\u884c\u4e00\u6b21\uff0c\u6240\u4ee5\u8282\u6d41\u4f1a\u7a00\u91ca\u51fd\u6570\u7684\u6267\u884c\u9891\u7387<\/p><\/blockquote>\n<ul>\n<li>\u601d\u8def\uff1a<\/li>\n<\/ul>\n<blockquote><p>\u6bcf\u6b21\u89e6\u53d1\u4e8b\u4ef6\u65f6\u90fd\u5224\u65ad\u5f53\u524d\u662f\u5426\u6709\u7b49\u5f85\u6267\u884c\u7684\u5ef6\u65f6\u51fd\u6570<\/p><\/blockquote>\n<pre class=\"hljs javascript\"><code><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">throttle<\/span>(<span class=\"hljs-params\">fn<\/span>) <\/span>{\r\n      <span class=\"hljs-keyword\">let<\/span> canRun = <span class=\"hljs-literal\">true<\/span>; <span class=\"hljs-comment\">\/\/ \u901a\u8fc7\u95ed\u5305\u4fdd\u5b58\u4e00\u4e2a\u6807\u8bb0<\/span>\r\n      <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> () <\/span>{\r\n        <span class=\"hljs-keyword\">if<\/span> (!canRun) <span class=\"hljs-keyword\">return<\/span>; <span class=\"hljs-comment\">\/\/ \u5728\u51fd\u6570\u5f00\u5934\u5224\u65ad\u6807\u8bb0\u662f\u5426\u4e3atrue\uff0c\u4e0d\u4e3atrue\u5219return<\/span>\r\n        canRun = <span class=\"hljs-literal\">false<\/span>; <span class=\"hljs-comment\">\/\/ \u7acb\u5373\u8bbe\u7f6e\u4e3afalse<\/span>\r\n        setTimeout(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> { <span class=\"hljs-comment\">\/\/ \u5c06\u5916\u90e8\u4f20\u5165\u7684\u51fd\u6570\u7684\u6267\u884c\u653e\u5728setTimeout\u4e2d<\/span>\r\n          fn.apply(<span class=\"hljs-keyword\">this<\/span>, <span class=\"hljs-built_in\">arguments<\/span>);\r\n          <span class=\"hljs-comment\">\/\/ \u6700\u540e\u5728setTimeout\u6267\u884c\u5b8c\u6bd5\u540e\u518d\u628a\u6807\u8bb0\u8bbe\u7f6e\u4e3atrue(\u5173\u952e)\u8868\u793a\u53ef\u4ee5\u6267\u884c\u4e0b\u4e00\u6b21\u5faa\u73af\u4e86\u3002\u5f53\u5b9a\u65f6\u5668\u6ca1\u6709\u6267\u884c\u7684\u65f6\u5019\u6807\u8bb0\u6c38\u8fdc\u662ffalse\uff0c\u5728\u5f00\u5934\u88abreturn\u6389<\/span>\r\n          canRun = <span class=\"hljs-literal\">true<\/span>;\r\n        }, <span class=\"hljs-number\">500<\/span>);\r\n      };\r\n    }\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">sayHi<\/span>(<span class=\"hljs-params\">e<\/span>) <\/span>{\r\n      <span class=\"hljs-built_in\">console<\/span>.log(e.target.innerWidth, e.target.innerHeight);\r\n    }\r\n    <span class=\"hljs-built_in\">window<\/span>.addEventListener(<span class=\"hljs-string\">'resize'<\/span>, throttle(sayHi));<\/code><\/pre>\n<h3 id=\"articleHeader2\">2\u3001 get\u8bf7\u6c42\u4f20\u53c2\u957f\u5ea6\u7684\u8bef\u533a\u3001get\u548cpost\u8bf7\u6c42\u5728\u7f13\u5b58\u65b9\u9762\u7684\u533a\u522b<\/h3>\n<p><strong>\u8bef\u533a\uff1a\u6211\u4eec\u7ecf\u5e38\u8bf4get\u8bf7\u6c42\u53c2\u6570\u7684\u5927\u5c0f\u5b58\u5728\u9650\u5236\uff0c\u800cpost\u8bf7\u6c42\u7684\u53c2\u6570\u5927\u5c0f\u662f\u65e0\u9650\u5236\u7684\u3002<\/strong><\/p>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u5b9e\u9645\u4e0aHTTP \u534f\u8bae\u4ece\u672a\u89c4\u5b9a GET\/POST \u7684\u8bf7\u6c42\u957f\u5ea6\u9650\u5236\u662f\u591a\u5c11\u3002\u5bf9get\u8bf7\u6c42\u53c2\u6570\u7684\u9650\u5236\u662f\u6765\u6e90\u4e0e\u6d4f\u89c8\u5668\u6216web\u670d\u52a1\u5668\uff0c\u6d4f\u89c8\u5668\u6216web\u670d\u52a1\u5668\u9650\u5236\u4e86url\u7684\u957f\u5ea6\u3002\u4e3a\u4e86\u660e\u786e\u8fd9\u4e2a\u6982\u5ff5\uff0c\u6211\u4eec\u5fc5\u987b\u518d\u6b21\u5f3a\u8c03\u4e0b\u9762\u51e0\u70b9:<\/p>\n<ul>\n<li>HTTP \u534f\u8bae \u672a\u89c4\u5b9a GET \u548cPOST\u7684\u957f\u5ea6\u9650\u5236<\/li>\n<li>GET\u7684\u6700\u5927\u957f\u5ea6\u663e\u793a\u662f\u56e0\u4e3a \u6d4f\u89c8\u5668\u548c web\u670d\u52a1\u5668\u9650\u5236\u4e86 URI\u7684\u957f\u5ea6<\/li>\n<li>\u4e0d\u540c\u7684\u6d4f\u89c8\u5668\u548cWEB\u670d\u52a1\u5668\uff0c\u9650\u5236\u7684\u6700\u5927\u957f\u5ea6\u4e0d\u4e00\u6837<\/li>\n<li>\u8981\u652f\u6301IE\uff0c\u5219\u6700\u5927\u957f\u5ea6\u4e3a2083byte\uff0c\u82e5\u53ea\u652f\u6301Chrome\uff0c\u5219\u6700\u5927\u957f\u5ea6 8182byte<\/li>\n<\/ul>\n<p>\u8865\u5145\u8865\u5145\u4e00\u4e2aget\u548cpost\u5728\u7f13\u5b58\u65b9\u9762\u7684\u533a\u522b\uff1a<\/p>\n<ul>\n<li>get\u8bf7\u6c42\u7c7b\u4f3c\u4e8e\u67e5\u627e\u7684\u8fc7\u7a0b\uff0c\u7528\u6237\u83b7\u53d6\u6570\u636e\uff0c\u53ef\u4ee5\u4e0d\u7528\u6bcf\u6b21\u90fd\u4e0e\u6570\u636e\u5e93\u8fde\u63a5\uff0c\u6240\u4ee5\u53ef\u4ee5\u4f7f\u7528\u7f13\u5b58\u3002<\/li>\n<li>post\u4e0d\u540c\uff0cpost\u505a\u7684\u4e00\u822c\u662f\u4fee\u6539\u548c\u5220\u9664\u7684\u5de5\u4f5c\uff0c\u6240\u4ee5\u5fc5\u987b\u4e0e\u6570\u636e\u5e93\u4ea4\u4e92\uff0c\u6240\u4ee5\u4e0d\u80fd\u4f7f\u7528\u7f13\u5b58\u3002\u56e0\u6b64get\u8bf7\u6c42\u9002\u5408\u4e8e\u8bf7\u6c42\u7f13\u5b58\u3002<\/li>\n<\/ul>\n<h3 id=\"articleHeader3\">3\u3001\u6a21\u5757\u5316\u53d1\u5c55\u5386\u7a0b<\/h3>\n<p>\u53ef\u4eceIIFE\u3001AMD\u3001CMD\u3001CommonJS\u3001UMD\u3001webpack(require.ensure)\u3001ES Module\u3001<code>&lt;script type=\"module\"&gt;<\/code>\u00a0\u8fd9\u51e0\u4e2a\u89d2\u5ea6\u8003\u8651\u3002<\/p>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u6a21\u5757\u5316\u4e3b\u8981\u662f\u7528\u6765\u62bd\u79bb\u516c\u5171\u4ee3\u7801\uff0c\u9694\u79bb\u4f5c\u7528\u57df\uff0c\u907f\u514d\u53d8\u91cf\u51b2\u7a81\u7b49\u3002<\/p>\n<p><strong>IIFE<\/strong>\uff1a \u4f7f\u7528\u81ea\u6267\u884c\u51fd\u6570\u6765\u7f16\u5199\u6a21\u5757\u5316\uff0c\u7279\u70b9\uff1a<strong>\u5728\u4e00\u4e2a\u5355\u72ec\u7684\u51fd\u6570\u4f5c\u7528\u57df\u4e2d\u6267\u884c\u4ee3\u7801\uff0c\u907f\u514d\u53d8\u91cf\u51b2\u7a81<\/strong>\u3002<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\">(<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>()<\/span>{\r\n  <span class=\"hljs-keyword\">return<\/span> {\r\n    <span class=\"hljs-attr\">data<\/span>:[]\r\n  }\r\n})()<\/code><\/pre>\n<p><strong>AMD<\/strong>\uff1a \u4f7f\u7528requireJS \u6765\u7f16\u5199\u6a21\u5757\u5316\uff0c\u7279\u70b9\uff1a<strong>\u4f9d\u8d56\u5fc5\u987b\u63d0\u524d\u58f0\u660e\u597d<\/strong>\u3002<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\">define(<span class=\"hljs-string\">'.\/index.js'<\/span>,<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\">code<\/span>)<\/span>{\r\n    <span class=\"hljs-comment\">\/\/ code \u5c31\u662findex.js \u8fd4\u56de\u7684\u5185\u5bb9<\/span>\r\n})<\/code><\/pre>\n<p><strong>CMD<\/strong>\uff1a \u4f7f\u7528seaJS \u6765\u7f16\u5199\u6a21\u5757\u5316\uff0c\u7279\u70b9\uff1a<strong>\u652f\u6301\u52a8\u6001\u5f15\u5165\u4f9d\u8d56\u6587\u4ef6<\/strong>\u3002<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\">define(<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\">require, exports, module<\/span>) <\/span>{  \r\n  <span class=\"hljs-keyword\">var<\/span> indexCode = <span class=\"hljs-built_in\">require<\/span>(<span class=\"hljs-string\">'.\/index.js'<\/span>);\r\n})<\/code><\/pre>\n<p><strong>CommonJS<\/strong>\uff1a nodejs \u4e2d\u81ea\u5e26\u7684\u6a21\u5757\u5316\u3002<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-keyword\">var<\/span>\u00a0fs =\u00a0<span class=\"hljs-built_in\">require<\/span>(<span class=\"hljs-string\">'fs'<\/span>);<\/code><\/pre>\n<p><strong>UMD<\/strong>\uff1a\u517c\u5bb9AMD\uff0cCommonJS \u6a21\u5757\u5316\u8bed\u6cd5\u3002<\/p>\n<p><strong>webpack(require.ensure)<\/strong>\uff1awebpack 2.x \u7248\u672c\u4e2d\u7684\u4ee3\u7801\u5206\u5272\u3002<\/p>\n<p><strong>ES Modules<\/strong>\uff1a ES6 \u5f15\u5165\u7684\u6a21\u5757\u5316\uff0c\u652f\u6301import \u6765\u5f15\u5165\u53e6\u4e00\u4e2a js \u3002<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-keyword\">import<\/span>\u00a0a\u00a0<span class=\"hljs-keyword\">from<\/span>\u00a0<span class=\"hljs-string\">'a'<\/span>;<\/code><\/pre>\n<h3 id=\"articleHeader4\">4\u3001npm \u6a21\u5757\u5b89\u88c5\u673a\u5236\uff0c\u4e3a\u4ec0\u4e48\u8f93\u5165 npm install \u5c31\u53ef\u4ee5\u81ea\u52a8\u5b89\u88c5\u5bf9\u5e94\u7684\u6a21\u5757\uff1f<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<h4>1. npm \u6a21\u5757\u5b89\u88c5\u673a\u5236\uff1a<\/h4>\n<ul>\n<li>\u53d1\u51fa<code>npm install<\/code>\u547d\u4ee4<\/li>\n<li>\u67e5\u8be2node_modules\u76ee\u5f55\u4e4b\u4e2d\u662f\u5426\u5df2\u7ecf\u5b58\u5728\u6307\u5b9a\u6a21\u5757\n<ul>\n<li>\u82e5\u5b58\u5728\uff0c\u4e0d\u518d\u91cd\u65b0\u5b89\u88c5<\/li>\n<li>\u82e5\u4e0d\u5b58\u5728\n<ul>\n<li>npm \u5411 registry \u67e5\u8be2\u6a21\u5757\u538b\u7f29\u5305\u7684\u7f51\u5740<\/li>\n<li>\u4e0b\u8f7d\u538b\u7f29\u5305\uff0c\u5b58\u653e\u5728\u6839\u76ee\u5f55\u4e0b\u7684<code>.npm<\/code>\u76ee\u5f55\u91cc<\/li>\n<li>\u89e3\u538b\u538b\u7f29\u5305\u5230\u5f53\u524d\u9879\u76ee\u7684<code>node_modules<\/code>\u76ee\u5f55<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>2. npm \u5b9e\u73b0\u539f\u7406<\/h4>\n<p>\u8f93\u5165 npm install \u547d\u4ee4\u5e76\u6572\u4e0b\u56de\u8f66\u540e\uff0c\u4f1a\u7ecf\u5386\u5982\u4e0b\u51e0\u4e2a\u9636\u6bb5\uff08\u4ee5 npm 5.5.1 \u4e3a\u4f8b\uff09\uff1a<\/p>\n<ol>\n<li><strong>\u6267\u884c\u5de5\u7a0b\u81ea\u8eab preinstall<\/strong>\u5f53\u524d npm \u5de5\u7a0b\u5982\u679c\u5b9a\u4e49\u4e86 preinstall \u94a9\u5b50\u6b64\u65f6\u4f1a\u88ab\u6267\u884c\u3002<\/li>\n<li><strong>\u786e\u5b9a\u9996\u5c42\u4f9d\u8d56\u6a21\u5757<\/strong>\u9996\u5148\u9700\u8981\u505a\u7684\u662f\u786e\u5b9a\u5de5\u7a0b\u4e2d\u7684\u9996\u5c42\u4f9d\u8d56\uff0c\u4e5f\u5c31\u662f dependencies \u548c devDependencies \u5c5e\u6027\u4e2d\u76f4\u63a5\u6307\u5b9a\u7684\u6a21\u5757\uff08\u5047\u8bbe\u6b64\u65f6\u6ca1\u6709\u6dfb\u52a0 npm install \u53c2\u6570\uff09\u3002\u5de5\u7a0b\u672c\u8eab\u662f\u6574\u68f5\u4f9d\u8d56\u6811\u7684\u6839\u8282\u70b9\uff0c\u6bcf\u4e2a\u9996\u5c42\u4f9d\u8d56\u6a21\u5757\u90fd\u662f\u6839\u8282\u70b9\u4e0b\u9762\u7684\u4e00\u68f5\u5b50\u6811\uff0cnpm \u4f1a\u5f00\u542f\u591a\u8fdb\u7a0b\u4ece\u6bcf\u4e2a\u9996\u5c42\u4f9d\u8d56\u6a21\u5757\u5f00\u59cb\u9010\u6b65\u5bfb\u627e\u66f4\u6df1\u5c42\u7ea7\u7684\u8282\u70b9\u3002<\/li>\n<li><strong>\u83b7\u53d6\u6a21\u5757<\/strong>\u83b7\u53d6\u6a21\u5757\u662f\u4e00\u4e2a\u9012\u5f52\u7684\u8fc7\u7a0b\uff0c\u5206\u4e3a\u4ee5\u4e0b\u51e0\u6b65\uff1a\n<ul>\n<li>\u83b7\u53d6\u6a21\u5757\u4fe1\u606f\u3002\u5728\u4e0b\u8f7d\u4e00\u4e2a\u6a21\u5757\u4e4b\u524d\uff0c\u9996\u5148\u8981\u786e\u5b9a\u5176\u7248\u672c\uff0c\u8fd9\u662f\u56e0\u4e3a package.json \u4e2d\u5f80\u5f80\u662f semantic 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\u4f1a\u7528\u6b64\u5730\u5740\u68c0\u67e5\u672c\u5730\u7f13\u5b58\uff0c\u7f13\u5b58\u4e2d\u6709\u5c31\u76f4\u63a5\u62ff\uff0c\u5982\u679c\u6ca1\u6709\u5219\u4ece\u4ed3\u5e93\u4e0b\u8f7d\u3002<\/li>\n<li>\u67e5\u627e\u8be5\u6a21\u5757\u4f9d\u8d56\uff0c\u5982\u679c\u6709\u4f9d\u8d56\u5219\u56de\u5230\u7b2c1\u6b65\uff0c\u5982\u679c\u6ca1\u6709\u5219\u505c\u6b62\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u6a21\u5757\u6241\u5e73\u5316\uff08dedupe\uff09<\/strong>\u4e0a\u4e00\u6b65\u83b7\u53d6\u5230\u7684\u662f\u4e00\u68f5\u5b8c\u6574\u7684\u4f9d\u8d56\u6811\uff0c\u5176\u4e2d\u53ef\u80fd\u5305\u542b\u5927\u91cf\u91cd\u590d\u6a21\u5757\u3002\u6bd4\u5982 A \u6a21\u5757\u4f9d\u8d56\u4e8e loadsh\uff0cB \u6a21\u5757\u540c\u6837\u4f9d\u8d56\u4e8e lodash\u3002\u5728 npm3 \u4ee5\u524d\u4f1a\u4e25\u683c\u6309\u7167\u4f9d\u8d56\u6811\u7684\u7ed3\u6784\u8fdb\u884c\u5b89\u88c5\uff0c\u56e0\u6b64\u4f1a\u9020\u6210\u6a21\u5757\u5197\u4f59\u3002\u4ece npm3 \u5f00\u59cb\u9ed8\u8ba4\u52a0\u5165\u4e86\u4e00\u4e2a dedupe \u7684\u8fc7\u7a0b\u3002\u5b83\u4f1a\u904d\u5386\u6240\u6709\u8282\u70b9\uff0c\u9010\u4e2a\u5c06\u6a21\u5757\u653e\u5728\u6839\u8282\u70b9\u4e0b\u9762\uff0c\u4e5f\u5c31\u662f node-modules \u7684\u7b2c\u4e00\u5c42\u3002\u5f53\u53d1\u73b0\u6709<strong>\u91cd\u590d\u6a21\u5757<\/strong>\u65f6\uff0c\u5219\u5c06\u5176\u4e22\u5f03\u3002\n<p>\u8fd9\u91cc\u9700\u8981\u5bf9<strong>\u91cd\u590d\u6a21\u5757<\/strong>\u8fdb\u884c\u4e00\u4e2a\u5b9a\u4e49\uff0c\u5b83\u6307\u7684\u662f<strong>\u6a21\u5757\u540d\u76f8\u540c<\/strong>\u4e14\u00a0<strong>semver \u517c\u5bb9\u3002\u6bcf\u4e2a semver \u90fd\u5bf9\u5e94\u4e00\u6bb5\u7248\u672c\u5141\u8bb8\u8303\u56f4\uff0c\u5982\u679c\u4e24\u4e2a\u6a21\u5757\u7684\u7248\u672c\u5141\u8bb8\u8303\u56f4\u5b58\u5728\u4ea4\u96c6\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u5f97\u5230\u4e00\u4e2a\u517c\u5bb9<\/strong>\u7248\u672c\uff0c\u800c\u4e0d\u5fc5\u7248\u672c\u53f7\u5b8c\u5168\u4e00\u81f4\uff0c\u8fd9\u53ef\u4ee5\u4f7f\u66f4\u591a\u5197\u4f59\u6a21\u5757\u5728 dedupe \u8fc7\u7a0b\u4e2d\u88ab\u53bb\u6389\u3002<\/p>\n<p>\u6bd4\u5982 node-modules \u4e0b foo \u6a21\u5757\u4f9d\u8d56 lodash@^1.0.0\uff0cbar \u6a21\u5757\u4f9d\u8d56 lodash@^1.1.0\uff0c\u5219\u00a0<strong>^1.1.0<\/strong>\u00a0\u4e3a\u517c\u5bb9\u7248\u672c\u3002<\/p>\n<p>\u800c\u5f53 foo \u4f9d\u8d56 lodash@^2.0.0\uff0cbar \u4f9d\u8d56 lodash@^1.1.0\uff0c\u5219\u4f9d\u636e semver \u7684\u89c4\u5219\uff0c\u4e8c\u8005\u4e0d\u5b58\u5728\u517c\u5bb9\u7248\u672c\u3002\u4f1a\u5c06\u4e00\u4e2a\u7248\u672c\u653e\u5728 node_modules \u4e2d\uff0c\u53e6\u4e00\u4e2a\u4ecd\u4fdd\u7559\u5728\u4f9d\u8d56\u6811\u91cc\u3002<\/p>\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5047\u8bbe\u4e00\u4e2a\u4f9d\u8d56\u6811\u539f\u672c\u662f\u8fd9\u6837\uff1a<\/p>\n<p>node_modules<br \/>\n&#8212; foo<br \/>\n&#8212;- lodash@version1<\/p>\n<p>&#8212; bar<br \/>\n&#8212;- lodash@version2<\/p>\n<p>\u5047\u8bbe version1 \u548c version2 \u662f\u517c\u5bb9\u7248\u672c\uff0c\u5219\u7ecf\u8fc7 dedupe \u4f1a\u6210\u4e3a\u4e0b\u9762\u7684\u5f62\u5f0f\uff1a<\/p>\n<p>node_modules<br \/>\n&#8212; foo<\/p>\n<p>&#8212; bar<\/p>\n<p>&#8212; lodash\uff08\u4fdd\u7559\u7684\u7248\u672c\u4e3a\u517c\u5bb9\u7248\u672c\uff09<\/p>\n<p>\u5047\u8bbe version1 \u548c version2 \u4e3a\u975e\u517c\u5bb9\u7248\u672c\uff0c\u5219\u540e\u9762\u7684\u7248\u672c\u4fdd\u7559\u5728\u4f9d\u8d56\u6811\u4e2d\uff1a<\/p>\n<p>node_modules<br \/>\n&#8212; foo<br \/>\n&#8212; lodash@version1<\/p>\n<p>&#8212; bar<br \/>\n&#8212;- lodash@version2<\/li>\n<li><strong>\u5b89\u88c5\u6a21\u5757<\/strong>\u8fd9\u4e00\u6b65\u5c06\u4f1a\u66f4\u65b0\u5de5\u7a0b\u4e2d\u7684 node_modules\uff0c\u5e76\u6267\u884c\u6a21\u5757\u4e2d\u7684\u751f\u547d\u5468\u671f\u51fd\u6570\uff08\u6309\u7167 preinstall\u3001install\u3001postinstall \u7684\u987a\u5e8f\uff09\u3002<\/li>\n<li><strong>\u6267\u884c\u5de5\u7a0b\u81ea\u8eab\u751f\u547d\u5468\u671f<\/strong>\u5f53\u524d npm \u5de5\u7a0b\u5982\u679c\u5b9a\u4e49\u4e86\u94a9\u5b50\u6b64\u65f6\u4f1a\u88ab\u6267\u884c\uff08\u6309\u7167 install\u3001postinstall\u3001prepublish\u3001prepare \u7684\u987a\u5e8f\uff09\u3002\u6700\u540e\u4e00\u6b65\u662f\u751f\u6210\u6216\u66f4\u65b0\u7248\u672c\u63cf\u8ff0\u6587\u4ef6\uff0cnpm install \u8fc7\u7a0b\u5b8c\u6210\u3002<\/li>\n<\/ol>\n<h3 id=\"articleHeader5\">5\u3001ES5\u7684\u7ee7\u627f\u548cES6\u7684\u7ee7\u627f\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>ES5\u7684\u7ee7\u627f\u65f6\u901a\u8fc7prototype\u6216\u6784\u9020\u51fd\u6570\u673a\u5236\u6765\u5b9e\u73b0\u3002<strong>ES5\u7684\u7ee7\u627f\u5b9e\u8d28\u4e0a\u662f\u5148\u521b\u5efa\u5b50\u7c7b\u7684\u5b9e\u4f8b\u5bf9\u8c61\uff0c\u7136\u540e\u518d\u5c06\u7236\u7c7b\u7684\u65b9\u6cd5\u6dfb\u52a0\u5230this\u4e0a<\/strong>\uff08Parent.apply(this)\uff09\u3002<\/p>\n<p>ES6\u7684\u7ee7\u627f\u673a\u5236\u5b8c\u5168\u4e0d\u540c\uff0c<strong>\u5b9e\u8d28\u4e0a\u662f\u5148\u521b\u5efa\u7236\u7c7b\u7684\u5b9e\u4f8b\u5bf9\u8c61this\uff08\u6240\u4ee5\u5fc5\u987b\u5148\u8c03\u7528\u7236\u7c7b\u7684super()\u65b9\u6cd5\uff09\uff0c\u7136\u540e\u518d\u7528\u5b50\u7c7b\u7684\u6784\u9020\u51fd\u6570\u4fee\u6539this<\/strong>\u3002<\/p>\n<p>\u5177\u4f53\u7684\uff1aES6\u901a\u8fc7class\u5173\u952e\u5b57\u5b9a\u4e49\u7c7b\uff0c\u91cc\u9762\u6709\u6784\u9020\u65b9\u6cd5\uff0c\u7c7b\u4e4b\u95f4\u901a\u8fc7extends\u5173\u952e\u5b57\u5b9e\u73b0\u7ee7\u627f\u3002\u5b50\u7c7b\u5fc5\u987b\u5728constructor\u65b9\u6cd5\u4e2d\u8c03\u7528super\u65b9\u6cd5\uff0c\u5426\u5219\u65b0\u5efa\u5b9e\u4f8b\u62a5\u9519\u3002\u56e0\u4e3a\u5b50\u7c7b\u6ca1\u6709\u81ea\u5df1\u7684this\u5bf9\u8c61\uff0c\u800c\u662f\u7ee7\u627f\u4e86\u7236\u7c7b\u7684this\u5bf9\u8c61\uff0c\u7136\u540e\u5bf9\u5176\u8fdb\u884c\u52a0\u5de5\u3002\u5982\u679c\u4e0d\u8c03\u7528super\u65b9\u6cd5\uff0c\u5b50\u7c7b\u5f97\u4e0d\u5230this\u5bf9\u8c61\u3002<\/p>\n<p>ps\uff1asuper\u5173\u952e\u5b57\u6307\u4ee3\u7236\u7c7b\u7684\u5b9e\u4f8b\uff0c\u5373\u7236\u7c7b\u7684this\u5bf9\u8c61\u3002\u5728\u5b50\u7c7b\u6784\u9020\u51fd\u6570\u4e2d\uff0c\u8c03\u7528super\u540e\uff0c\u624d\u53ef\u4f7f\u7528this\u5173\u952e\u5b57\uff0c\u5426\u5219\u62a5\u9519\u3002<\/p>\n<h3 id=\"articleHeader6\">6\u3001setTimeout\u3001Promise\u3001Async\/Await \u7684\u533a\u522b<\/h3>\n<p><a href=\"https:\/\/gongchenghuigch.github.io\/2019\/09\/14\/awat\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">\u53c2\u8003\u7b54\u6848<\/a><\/p>\n<h3 id=\"articleHeader7\">7\u3001\u5b9a\u65f6\u5668\u7684\u6267\u884c\u987a\u5e8f\u6216\u673a\u5236\uff1f<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p><strong>\u56e0\u4e3ajs\u662f\u5355\u7ebf\u7a0b\u7684\uff0c\u6d4f\u89c8\u5668\u9047\u5230setTimeout\u6216\u8005setInterval\u4f1a\u5148\u6267\u884c\u5b8c\u5f53\u524d\u7684\u4ee3\u7801\u5757\uff0c\u5728\u6b64\u4e4b\u524d\u4f1a\u628a\u5b9a\u65f6\u5668\u63a8\u5165\u6d4f\u89c8\u5668\u7684\u5f85\u6267\u884c\u4e8b\u4ef6\u961f\u5217\u91cc\u9762\uff0c\u7b49\u5230\u6d4f\u89c8\u5668\u6267\u884c\u5b8c\u5f53\u524d\u4ee3\u7801\u4e4b\u540e\u4f1a\u770b\u4e00\u4e0b\u4e8b\u4ef6\u961f\u5217\u91cc\u9762\u6709\u6ca1\u6709\u4efb\u52a1\uff0c\u6709\u7684\u8bdd\u624d\u6267\u884c\u5b9a\u65f6\u5668\u7684\u4ee3\u7801\u3002<\/strong>\u6240\u4ee5\u5373\u4f7f\u628a\u5b9a\u65f6\u5668\u7684\u65f6\u95f4\u8bbe\u7f6e\u4e3a0\u8fd8\u662f\u4f1a\u5148\u6267\u884c\u5f53\u524d\u7684\u4e00\u4e9b\u4ee3\u7801\u3002<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">test<\/span>()<\/span>{\r\n    <span class=\"hljs-keyword\">var<\/span> aa = <span class=\"hljs-number\">0<\/span>;\r\n    <span class=\"hljs-keyword\">var<\/span> testSet = setInterval(<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>()<\/span>{\r\n        aa++;\r\n        <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-number\">123<\/span>);\r\n        <span class=\"hljs-keyword\">if<\/span>(aa&lt;<span class=\"hljs-number\">10<\/span>){\r\n            clearInterval(testSet);\r\n        }\r\n    },<span class=\"hljs-number\">20<\/span>);\r\n  <span class=\"hljs-keyword\">var<\/span> testSet1 = setTimeout(<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>()<\/span>{\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-number\">321<\/span>)\r\n  },<span class=\"hljs-number\">1000<\/span>);\r\n  <span class=\"hljs-keyword\">for<\/span>(<span class=\"hljs-keyword\">var<\/span> i=<span class=\"hljs-number\">0<\/span>;i&lt;<span class=\"hljs-number\">10<\/span>;i++){\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'test'<\/span>);\r\n  }\r\n}\r\ntest()<\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"hljs typescript\"><code>test <span class=\"hljs-comment\">\/\/10\u6b21<\/span>\r\n<span class=\"hljs-literal\">undefined<\/span>\r\n<span class=\"hljs-number\">123<\/span>\r\n<span class=\"hljs-number\">321<\/span><\/code><\/pre>\n<h3 id=\"articleHeader8\">8\u3001[&#8216;1&#8242;,&#8217;2&#8242;,&#8217;3&#8217;].map(parseInt) \u8f93\u51fa\u4ec0\u4e48,\u4e3a\u4ec0\u4e48?<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u8f93\u51fa\uff1a<strong>[1, NaN, NaN]<\/strong><\/p>\n<ul>\n<li>\u9996\u5148\u8ba9\u6211\u4eec\u56de\u987e\u4e00\u4e0b\uff0cmap\u51fd\u6570\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570callback\uff1a<\/li>\n<\/ul>\n<p><code>var new_array = arr.map(function callback(currentValue[, index[, array]]) { \/\/ Return element for new_array }[, thisArg])<\/code><br \/>\n\u8fd9\u4e2acallback\u4e00\u5171\u53ef\u4ee5\u63a5\u6536\u4e09\u4e2a\u53c2\u6570\uff0c\u5176\u4e2d\u7b2c\u4e00\u4e2a\u53c2\u6570\u4ee3\u8868\u5f53\u524d\u88ab\u5904\u7406\u7684\u5143\u7d20\uff0c\u800c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4ee3\u8868\u8be5\u5143\u7d20\u7684\u7d22\u5f15\u3002<\/p>\n<ul>\n<li>\u800cparseInt\u5219\u662f\u7528\u6765\u89e3\u6790\u5b57\u7b26\u4e32\u7684\uff0c\u4f7f\u5b57\u7b26\u4e32\u6210\u4e3a\u6307\u5b9a\u57fa\u6570\u7684\u6574\u6570\u3002<br \/>\n<code>parseInt(string, radix)<\/code><br \/>\n\u63a5\u6536\u4e24\u4e2a\u53c2\u6570\uff0c\u7b2c\u4e00\u4e2a\u8868\u793a\u88ab\u5904\u7406\u7684\u503c\uff08\u5b57\u7b26\u4e32\uff09\uff0c\u7b2c\u4e8c\u4e2a\u8868\u793a\u4e3a\u89e3\u6790\u65f6\u7684\u57fa\u6570\u3002<\/li>\n<li>\u4e86\u89e3\u8fd9\u4e24\u4e2a\u51fd\u6570\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u6a21\u62df\u4e00\u4e0b\u8fd0\u884c\u60c5\u51b5<\/li>\n<\/ul>\n<ol>\n<li>parseInt(&#8216;1&#8217;, 0) \/\/radix\u4e3a0\u65f6\uff0c\u4e14string\u53c2\u6570\u4e0d\u4ee5\u201c0x\u201d\u548c\u201c0\u201d\u5f00\u5934\u65f6\uff0c\u6309\u716710\u4e3a\u57fa\u6570\u5904\u7406\u3002\u8fd9\u4e2a\u65f6\u5019\u8fd4\u56de1<\/li>\n<li>parseInt(&#8216;2&#8217;, 1) \/\/\u57fa\u6570\u4e3a1\uff081\u8fdb\u5236\uff09\u8868\u793a\u7684\u6570\u4e2d\uff0c\u6700\u5927\u503c\u5c0f\u4e8e2\uff0c\u6240\u4ee5\u65e0\u6cd5\u89e3\u6790\uff0c\u8fd4\u56deNaN<\/li>\n<li>parseInt(&#8216;3&#8217;, 2) \/\/\u57fa\u6570\u4e3a2\uff082\u8fdb\u5236\uff09\u8868\u793a\u7684\u6570\u4e2d\uff0c\u6700\u5927\u503c\u5c0f\u4e8e3\uff0c\u6240\u4ee5\u65e0\u6cd5\u89e3\u6790\uff0c\u8fd4\u56deNaN<\/li>\n<\/ol>\n<ul>\n<li>map\u51fd\u6570\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u6240\u4ee5\u6700\u540e\u7ed3\u679c\u4e3a[1, NaN, NaN]<\/li>\n<\/ul>\n<h3 id=\"articleHeader9\">9\u3001Doctype\u4f5c\u7528? \u4e25\u683c\u6a21\u5f0f\u4e0e\u6df7\u6742\u6a21\u5f0f\u5982\u4f55\u533a\u5206\uff1f\u5b83\u4eec\u6709\u4f55\u610f\u4e49?<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>Doctype\u58f0\u660e\u4e8e\u6587\u6863\u6700\u524d\u9762\uff0c\u544a\u8bc9\u6d4f\u89c8\u5668\u4ee5\u4f55\u79cd\u65b9\u5f0f\u6765\u6e32\u67d3\u9875\u9762\uff0c\u8fd9\u91cc\u6709\u4e24\u79cd\u6a21\u5f0f\uff0c\u4e25\u683c\u6a21\u5f0f\u548c\u6df7\u6742\u6a21\u5f0f\u3002<\/p>\n<ul>\n<li>\u4e25\u683c\u6a21\u5f0f\u7684\u6392\u7248\u548c JS \u8fd0\u4f5c\u6a21\u5f0f\u662f \u4ee5\u8be5\u6d4f\u89c8\u5668\u652f\u6301\u7684\u6700\u9ad8\u6807\u51c6\u8fd0\u884c\u3002<\/li>\n<li>\u6df7\u6742\u6a21\u5f0f\uff0c\u5411\u540e\u517c\u5bb9\uff0c\u6a21\u62df\u8001\u5f0f\u6d4f\u89c8\u5668\uff0c\u9632\u6b62\u6d4f\u89c8\u5668\u65e0\u6cd5\u517c\u5bb9\u9875\u9762\u3002<\/li>\n<\/ul>\n<h3 id=\"articleHeader10\">10\u3001fetch\u53d1\u90012\u6b21\u8bf7\u6c42\u7684\u539f\u56e0<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p><strong>fetch\u53d1\u9001post\u8bf7\u6c42\u7684\u65f6\u5019\uff0c\u603b\u662f\u53d1\u90012\u6b21\uff0c\u7b2c\u4e00\u6b21\u72b6\u6001\u7801\u662f204\uff0c\u7b2c\u4e8c\u6b21\u624d\u6210\u529f\uff1f<\/strong><\/p>\n<p>\u539f\u56e0\u5f88\u7b80\u5355\uff0c\u56e0\u4e3a\u4f60\u7528fetch\u7684post\u8bf7\u6c42\u7684\u65f6\u5019\uff0c\u5bfc\u81f4fetch \u7b2c\u4e00\u6b21\u53d1\u9001\u4e86\u4e00\u4e2aOptions\u8bf7\u6c42\uff0c\u8be2\u95ee\u670d\u52a1\u5668\u662f\u5426\u652f\u6301\u4fee\u6539\u7684\u8bf7\u6c42\u5934\uff0c\u5982\u679c\u670d\u52a1\u5668\u652f\u6301\uff0c\u5219\u5728\u7b2c\u4e8c\u6b21\u4e2d\u53d1\u9001\u771f\u6b63\u7684\u8bf7\u6c42\u3002<\/p>\n<h2 id=\"articleHeader11\">http\u3001\u6d4f\u89c8\u5668\u5bf9\u8c61<\/h2>\n<h3 id=\"articleHeader12\">1\u3001HTTPS \u63e1\u624b\u8fc7\u7a0b\u4e2d\uff0c\u5ba2\u6237\u7aef\u5982\u4f55\u9a8c\u8bc1\u8bc1\u4e66\u7684\u5408\u6cd5\u6027<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<ul>\n<li>\u9996\u5148\u4ec0\u4e48\u662fHTTP\u534f\u8bae?http\u534f\u8bae\u662f\u8d85\u6587\u672c\u4f20\u8f93\u534f\u8bae\uff0c\u4f4d\u4e8etcp\/ip\u56db\u5c42\u6a21\u578b\u4e2d\u7684\u5e94\u7528\u5c42\uff1b\u901a\u8fc7\u8bf7\u6c42\/\u54cd\u5e94\u7684\u65b9\u5f0f\u5728\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u4e4b\u95f4\u8fdb\u884c\u901a\u4fe1\uff1b\u4f46\u662f\u7f3a\u5c11\u5b89\u5168\u6027\uff0chttp\u534f\u8bae\u4fe1\u606f\u4f20\u8f93\u662f\u901a\u8fc7\u660e\u6587\u7684\u65b9\u5f0f\u4f20\u8f93\uff0c\u4e0d\u505a\u4efb\u4f55\u52a0\u5bc6\uff0c\u76f8\u5f53\u4e8e\u5728\u7f51\u7edc\u4e0a\u88f8\u5954\uff1b\u5bb9\u6613\u88ab\u4e2d\u95f4\u4eba\u6076\u610f\u7be1\u6539\uff0c\u8fd9\u79cd\u884c\u4e3a\u53eb\u505a\u4e2d\u95f4\u4eba\u653b\u51fb\uff1b<\/li>\n<li>\u52a0\u5bc6\u901a\u4fe1\uff1a\u4e3a\u4e86\u5b89\u5168\u6027\uff0c\u53cc\u65b9\u53ef\u4ee5\u4f7f\u7528\u5bf9\u79f0\u52a0\u5bc6\u7684\u65b9\u5f0fkey\u8fdb\u884c\u4fe1\u606f\u4ea4\u6d41\uff0c\u4f46\u662f\u8fd9\u79cd\u65b9\u5f0f\u5bf9\u79f0\u52a0\u5bc6\u79d8\u94a5\u4e5f\u4f1a\u88ab\u62e6\u622a\uff0c\u4e5f\u4e0d\u591f\u5b89\u5168\uff0c\u8fdb\u800c\u8fd8\u662f\u5b58\u5728\u88ab\u4e2d\u95f4\u4eba\u653b\u51fb\u98ce\u9669\uff1b<br 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id=\"articleHeader13\">2\u3001TCP\u4e09\u6b21\u63e1\u624b\u548c\u56db\u6b21\u6325\u624b<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u4e09\u6b21\u63e1\u624b\u4e4b\u6240\u4ee5\u662f\u4e09\u6b21\u662f\u4fdd\u8bc1client\u548cserver\u5747\u8ba9\u5bf9\u65b9\u77e5\u9053\u81ea\u5df1\u7684\u63a5\u6536\u548c\u53d1\u9001\u80fd\u529b\u6ca1\u95ee\u9898\u800c\u4fdd\u8bc1\u7684\u6700\u5c0f\u6b21\u6570\u3002<\/p>\n<p>\u7b2c\u4e00\u6b21client =&gt; server \u53ea\u80fdserver\u5224\u65ad\u51faclient\u5177\u5907\u53d1\u9001\u80fd\u529b<br \/>\n\u7b2c\u4e8c\u6b21 server =&gt; client client\u5c31\u53ef\u4ee5\u5224\u65ad\u51faserver\u5177\u5907\u53d1\u9001\u548c\u63a5\u53d7\u80fd\u529b\u3002\u6b64\u65f6client\u8fd8\u9700\u8ba9server\u77e5\u9053\u81ea\u5df1\u63a5\u6536\u80fd\u529b\u6ca1\u95ee\u9898\u4e8e\u662f\u5c31\u6709\u4e86\u7b2c\u4e09\u6b21<br \/>\n\u7b2c\u4e09\u6b21 client =&gt; server \u53cc\u65b9\u5747\u4fdd\u8bc1\u4e86\u81ea\u5df1\u7684\u63a5\u6536\u548c\u53d1\u9001\u80fd\u529b\u6ca1\u6709\u95ee\u9898<\/p>\n<p>\u5176\u4e2d\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u540e\u7eed\u7684\u63e1\u624b\u662f\u4e3a\u4e86\u5e94\u7b54\u4e0a\u4e00\u4e2a\u63e1\u624b\uff0c\u6bcf\u6b21\u63e1\u624b\u90fd\u4f1a\u5e26\u4e00\u4e2a\u6807\u8bc6 seq\uff0c\u540e\u7eed\u7684ACK\u90fd\u4f1a\u5bf9\u8fd9\u4e2aseq\u8fdb\u884c\u52a0\u4e00\u6765\u8fdb\u884c\u786e\u8ba4\u3002<\/p>\n<h3 id=\"articleHeader14\">3\u3001<strong>img iframe script 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id=\"articleHeader15\">4\u3001http\u548chttps\u7684\u533a\u522b\uff1f<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>http\u4f20\u8f93\u7684\u6570\u636e\u90fd\u662f\u672a\u52a0\u5bc6\u7684\uff0c\u4e5f\u5c31\u662f\u660e\u6587\u7684\uff0c\u7f51\u666f\u516c\u53f8\u8bbe\u7f6e\u4e86SSL\u534f\u8bae\u6765\u5bf9http\u534f\u8bae\u4f20\u8f93\u7684\u6570\u636e\u8fdb\u884c\u52a0\u5bc6\u5904\u7406\uff0c\u7b80\u5355\u6765\u8bf4https\u534f\u8bae\u662f\u7531http\u548cssl\u534f\u8bae\u6784\u5efa\u7684\u53ef\u8fdb\u884c\u52a0\u5bc6\u4f20\u8f93\u548c\u8eab\u4efd\u8ba4\u8bc1\u7684\u7f51\u7edc\u534f\u8bae\uff0c\u6bd4http\u534f\u8bae\u7684\u5b89\u5168\u6027\u66f4\u9ad8\u3002 \u4e3b\u8981\u7684\u533a\u522b\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>Https\u534f\u8bae\u9700\u8981ca\u8bc1\u4e66\uff0c\u8d39\u7528\u8f83\u9ad8\u3002<\/li>\n<li>http\u662f\u8d85\u6587\u672c\u4f20\u8f93\u534f\u8bae\uff0c\u4fe1\u606f\u662f\u660e\u6587\u4f20\u8f93\uff0chttps\u5219\u662f\u5177\u6709\u5b89\u5168\u6027\u7684ssl\u52a0\u5bc6\u4f20\u8f93\u534f\u8bae\u3002<\/li>\n<li>\u4f7f\u7528\u4e0d\u540c\u7684\u94fe\u63a5\u65b9\u5f0f\uff0c\u7aef\u53e3\u4e5f\u4e0d\u540c\uff0c\u4e00\u822c\u800c\u8a00\uff0chttp\u534f\u8bae\u7684\u7aef\u53e3\u4e3a80\uff0chttps\u7684\u7aef\u53e3\u4e3a443<\/li>\n<li>http\u7684\u8fde\u63a5\u5f88\u7b80\u5355\uff0c\u662f\u65e0\u72b6\u6001\u7684\uff1bHTTPS\u534f\u8bae\u662f\u7531SSL+HTTP\u534f\u8bae\u6784\u5efa\u7684\u53ef\u8fdb\u884c\u52a0\u5bc6\u4f20\u8f93\u3001\u8eab\u4efd\u8ba4\u8bc1\u7684\u7f51\u7edc\u534f\u8bae\uff0c\u6bd4http\u534f\u8bae\u5b89\u5168\u3002<\/li>\n<\/ul>\n<h3 id=\"articleHeader16\">5\u3001\u4ec0\u4e48\u662fBom\uff1f\u6709\u54ea\u4e9b\u5e38\u7528\u7684Bom\u5c5e\u6027\uff1f<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>Bom\u662f\u6d4f\u89c8\u5668\u5bf9\u8c61<\/p>\n<p><strong>location\u5bf9\u8c61<\/strong><\/p>\n<ul>\n<li>location.href&#8211; \u8fd4\u56de\u6216\u8bbe\u7f6e\u5f53\u524d\u6587\u6863\u7684URL<\/li>\n<li>location.search &#8212; \u8fd4\u56deURL\u4e2d\u7684\u67e5\u8be2\u5b57\u7b26\u4e32\u90e8\u5206\u3002\u4f8b\u5982\u00a0<a href=\"http:\/\/www.dreamdu.com\/dreamdu.php?id=5&amp;name=dreamdu\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">http:\/\/www.dreamdu.com\/dreamd&#8230;<\/a>\u00a0\u8fd4\u56de\u5305\u62ec(?)\u540e\u9762\u7684\u5185\u5bb9?id=5&amp;name=dreamdu<\/li>\n<li>location.hash &#8212; \u8fd4\u56deURL#\u540e\u9762\u7684\u5185\u5bb9\uff0c\u5982\u679c\u6ca1\u6709#\uff0c\u8fd4\u56de\u7a7a location.host &#8212; \u8fd4\u56deURL\u4e2d\u7684\u57df\u540d\u90e8\u5206\uff0c\u4f8b\u5982www.dreamdu.com<\/li>\n<li>location.hostname &#8212; \u8fd4\u56deURL\u4e2d\u7684\u4e3b\u57df\u540d\u90e8\u5206\uff0c\u4f8b\u5982dreamdu.com<\/li>\n<li>location.pathname &#8212; \u8fd4\u56deURL\u7684\u57df\u540d\u540e\u7684\u90e8\u5206\u3002\u4f8b\u5982\u00a0<a href=\"http:\/\/www.dreamdu.com\/xhtml\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">http:\/\/www.dreamdu.com\/xhtml\/<\/a>\u00a0\u8fd4\u56de\/xhtml\/<\/li>\n<li>location.port &#8212; \u8fd4\u56deURL\u4e2d\u7684\u7aef\u53e3\u90e8\u5206\u3002\u4f8b\u5982\u00a0<a href=\"http:\/\/www.dreamdu.com\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">http:\/\/www.dreamdu.com<\/a>:8080\/xhtml\/ \u8fd4\u56de8080<\/li>\n<li>location.protocol &#8212; \u8fd4\u56deURL\u4e2d\u7684\u534f\u8bae\u90e8\u5206\u3002\u4f8b\u5982\u00a0<a href=\"http:\/\/www.dreamdu.com\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">http:\/\/www.dreamdu.com<\/a>:8080\/xhtml\/ \u8fd4\u56de(\/\/)\u524d\u9762\u7684\u5185\u5bb9http:<\/li>\n<li>location.assign &#8212; \u8bbe\u7f6e\u5f53\u524d\u6587\u6863\u7684URL<\/li>\n<li>location.replace() &#8212; \u8bbe\u7f6e\u5f53\u524d\u6587\u6863\u7684URL\uff0c\u5e76\u4e14\u5728history\u5bf9\u8c61\u7684\u5730\u5740\u5217\u8868\u4e2d\u79fb\u9664\u8fd9\u4e2aURL location.replace(url);<\/li>\n<li>location.reload() &#8212; \u91cd\u8f7d\u5f53\u524d\u9875\u9762<\/li>\n<\/ul>\n<p><strong>history\u5bf9\u8c61<\/strong><\/p>\n<ul>\n<li>history.go() &#8212; \u524d\u8fdb\u6216\u540e\u9000\u6307\u5b9a\u7684\u9875\u9762\u6570<\/li>\n<li>history.go(num); history.back() &#8212; \u540e\u9000\u4e00\u9875<\/li>\n<li>history.forward() &#8212; \u524d\u8fdb\u4e00\u9875<\/li>\n<\/ul>\n<p><strong>Navigator\u5bf9\u8c61<\/strong><\/p>\n<ul>\n<li>navigator.userAgent &#8212; 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id=\"articleHeader17\">6\u3001Cookie\u3001sessionStorage\u3001localStorage\u7684\u533a\u522b<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u5171\u540c\u70b9\uff1a\u90fd\u662f\u4fdd\u5b58\u5728\u6d4f\u89c8\u5668\u7aef\uff0c\u5e76\u4e14\u662f\u540c\u6e90\u7684<\/p>\n<ul>\n<li>Cookie\uff1acookie\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\u3002\u800csessionStorage\u548clocalStorage\u4e0d\u4f1a\u81ea\u52a8\u628a\u6570\u636e\u53d1\u7ed9\u670d\u52a1\u5668\uff0c\u4ec5\u5728\u672c\u5730\u4fdd\u5b58\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,\u5b58\u50a8\u7684\u5927\u5c0f\u5f88\u5c0f\u53ea\u67094K\u5de6\u53f3\u3002 \uff08key\uff1a\u53ef\u4ee5\u5728\u6d4f\u89c8\u5668\u548c\u670d\u52a1\u5668\u7aef\u6765\u56de\u4f20\u9012\uff0c\u5b58\u50a8\u5bb9\u91cf\u5c0f\uff0c\u53ea\u6709\u5927\u7ea64K\u5de6\u53f3\uff09<\/li>\n<li>sessionStorage\uff1a\u4ec5\u5728\u5f53\u524d\u6d4f\u89c8\u5668\u7a97\u53e3\u5173\u95ed\u524d\u6709\u6548\uff0c\u81ea\u7136\u4e5f\u5c31\u4e0d\u53ef\u80fd\u6301\u4e45\u4fdd\u6301\uff0clocalStorage\uff1a\u59cb\u7ec8\u6709\u6548\uff0c\u7a97\u53e3\u6216\u6d4f\u89c8\u5668\u5173\u95ed\u4e5f\u4e00\u76f4\u4fdd\u5b58\uff0c\u56e0\u6b64\u7528\u4f5c\u6301\u4e45\u6570\u636e\uff1bcookie\u53ea\u5728\u8bbe\u7f6e\u7684cookie\u8fc7\u671f\u65f6\u95f4\u4e4b\u524d\u4e00\u76f4\u6709\u6548\uff0c\u5373\u4f7f\u7a97\u53e3\u6216\u6d4f\u89c8\u5668\u5173\u95ed\u3002\uff08key\uff1a\u672c\u8eab\u5c31\u662f\u4e00\u4e2a\u56de\u8bdd\u8fc7\u7a0b\uff0c\u5173\u95ed\u6d4f\u89c8\u5668\u540e\u6d88\u5931\uff0csession\u4e3a\u4e00\u4e2a\u56de\u8bdd\uff0c\u5f53\u9875\u9762\u4e0d\u540c\u5373\u4f7f\u662f\u540c\u4e00\u9875\u9762\u6253\u5f00\u4e24\u6b21\uff0c\u4e5f\u88ab\u89c6\u4e3a\u540c\u4e00\u6b21\u56de\u8bdd\uff09<\/li>\n<li>localStorage\uff1alocalStorage \u5728\u6240\u6709\u540c\u6e90\u7a97\u53e3\u4e2d\u90fd\u662f\u5171\u4eab\u7684\uff1bcookie\u4e5f\u662f\u5728\u6240\u6709\u540c\u6e90\u7a97\u53e3\u4e2d\u90fd\u662f\u5171\u4eab\u7684\u3002\uff08key\uff1a\u540c\u6e90\u7a97\u53e3\u90fd\u4f1a\u5171\u4eab\uff0c\u5e76\u4e14\u4e0d\u4f1a\u5931\u6548\uff0c\u4e0d\u7ba1\u7a97\u53e3\u6216\u8005\u6d4f\u89c8\u5668\u5173\u95ed\u4e0e\u5426\u90fd\u4f1a\u59cb\u7ec8\u751f\u6548\uff09<\/li>\n<\/ul>\n<p>\u8865\u5145\u8bf4\u660e\u4e00\u4e0bcookie\u7684\u4f5c\u7528\uff1a<\/p>\n<ul>\n<li>\u4fdd\u5b58\u7528\u6237\u767b\u5f55\u72b6\u6001\u3002\u4f8b\u5982\u5c06\u7528\u6237id\u5b58\u50a8\u4e8e\u4e00\u4e2acookie\u5185\uff0c\u8fd9\u6837\u5f53\u7528\u6237\u4e0b\u6b21\u8bbf\u95ee\u8be5\u9875\u9762\u65f6\u5c31\u4e0d\u9700\u8981\u91cd\u65b0\u767b\u5f55\u4e86\uff0c\u73b0\u5728\u5f88\u591a\u8bba\u575b\u548c\u793e\u533a\u90fd\u63d0\u4f9b\u8fd9\u6837\u7684\u529f\u80fd\u3002 cookie\u8fd8\u53ef\u4ee5\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff0c\u5f53\u8d85\u8fc7\u65f6\u95f4\u671f\u9650\u540e\uff0ccookie\u5c31\u4f1a\u81ea\u52a8\u6d88\u5931\u3002\u56e0\u6b64\uff0c\u7cfb\u7edf\u5f80\u5f80\u53ef\u4ee5\u63d0\u793a\u7528\u6237\u4fdd\u6301\u767b\u5f55\u72b6\u6001\u7684\u65f6\u95f4\uff1a\u5e38\u89c1\u9009\u9879\u6709\u4e00\u4e2a\u6708\u3001\u4e09\u4e2a \u6708\u3001\u4e00\u5e74\u7b49\u3002<\/li>\n<li>\u8ddf\u8e2a\u7528\u6237\u884c\u4e3a\u3002\u4f8b\u5982\u4e00\u4e2a\u5929\u6c14\u9884\u62a5\u7f51\u7ad9\uff0c\u80fd\u591f\u6839\u636e\u7528\u6237\u9009\u62e9\u7684\u5730\u533a\u663e\u793a\u5f53\u5730\u7684\u5929\u6c14\u60c5\u51b5\u3002\u5982\u679c\u6bcf\u6b21\u90fd\u9700\u8981\u9009\u62e9\u6240\u5728\u5730\u662f\u70e6\u7410\u7684\uff0c\u5f53\u5229\u7528\u4e86 cookie\u540e\u5c31\u4f1a\u663e\u5f97\u5f88\u4eba\u6027\u5316\u4e86\uff0c\u7cfb\u7edf\u80fd\u591f\u8bb0\u4f4f\u4e0a\u4e00\u6b21\u8bbf\u95ee\u7684\u5730\u533a\uff0c\u5f53\u4e0b\u6b21\u518d\u6253\u5f00\u8be5\u9875\u9762\u65f6\uff0c\u5b83\u5c31\u4f1a\u81ea\u52a8\u663e\u793a\u4e0a\u6b21\u7528\u6237\u6240\u5728\u5730\u533a\u7684\u5929\u6c14\u60c5\u51b5\u3002\u56e0\u4e3a\u4e00\u5207\u90fd\u662f\u5728\u540e \u53f0\u5b8c\u6210\uff0c\u6240\u4ee5\u8fd9\u6837\u7684\u9875\u9762\u5c31\u50cf\u4e3a\u67d0\u4e2a\u7528\u6237\u6240\u5b9a\u5236\u7684\u4e00\u6837\uff0c\u4f7f\u7528\u8d77\u6765\u975e\u5e38\u65b9\u4fbf<\/li>\n<li>\u5b9a\u5236\u9875\u9762\u3002\u5982\u679c\u7f51\u7ad9\u63d0\u4f9b\u4e86\u6362\u80a4\u6216\u66f4\u6362\u5e03\u5c40\u7684\u529f\u80fd\uff0c\u90a3\u4e48\u53ef\u4ee5\u4f7f\u7528cookie\u6765\u8bb0\u5f55\u7528\u6237\u7684\u9009\u9879\uff0c\u4f8b\u5982\uff1a\u80cc\u666f\u8272\u3001\u5206\u8fa8\u7387\u7b49\u3002\u5f53\u7528\u6237\u4e0b\u6b21\u8bbf\u95ee\u65f6\uff0c\u4ecd\u7136\u53ef\u4ee5\u4fdd\u5b58\u4e0a\u4e00\u6b21\u8bbf\u95ee\u7684\u754c\u9762\u98ce\u683c\u3002<\/li>\n<\/ul>\n<h3 id=\"articleHeader18\">7\u3001Cookie\u5982\u4f55\u9632\u8303XSS\u653b\u51fb<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>XSS\uff08\u8de8\u7ad9\u811a\u672c\u653b\u51fb\uff09\u662f\u6307\u653b\u51fb\u8005\u5728\u8fd4\u56de\u7684HTML\u4e2d\u5d4c\u5165javascript\u811a\u672c\uff0c\u4e3a\u4e86\u51cf\u8f7b\u8fd9\u4e9b\u653b\u51fb\uff0c\u9700\u8981\u5728HTTP\u5934\u90e8\u914d\u4e0a\uff0cset-cookie\uff1a<\/p>\n<ul>\n<li>httponly-\u8fd9\u4e2a\u5c5e\u6027\u53ef\u4ee5\u9632\u6b62XSS,\u5b83\u4f1a\u7981\u6b62javascript\u811a\u672c\u6765\u8bbf\u95eecookie\u3002<\/li>\n<li>secure &#8211; \u8fd9\u4e2a\u5c5e\u6027\u544a\u8bc9\u6d4f\u89c8\u5668\u4ec5\u5728\u8bf7\u6c42\u4e3ahttps\u7684\u65f6\u5019\u53d1\u9001cookie\u3002<\/li>\n<\/ul>\n<p>\u7ed3\u679c\u5e94\u8be5\u662f\u8fd9\u6837\u7684\uff1aSet-Cookie=&#8230;..<\/p>\n<h3 id=\"articleHeader19\">8\u3001\u6d4f\u89c8\u5668\u548c Node \u4e8b\u4ef6\u5faa\u73af\u7684\u533a\u522b\uff1f<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u5176\u4e2d\u4e00\u4e2a\u4e3b\u8981\u7684\u533a\u522b\u5728\u4e8e\u6d4f\u89c8\u5668\u7684event loop \u548cnodejs\u7684event loop \u5728\u5904\u7406\u5f02\u6b65\u4e8b\u4ef6\u7684\u987a\u5e8f\u662f\u4e0d\u540c\u7684,nodejs\u4e2d\u6709micro event;\u5176\u4e2dPromise\u5c5e\u4e8emicro event \u8be5\u5f02\u6b65\u4e8b\u4ef6\u7684\u5904\u7406\u987a\u5e8f\u5c31\u548c\u6d4f\u89c8\u5668\u4e0d\u540c.nodejs V11.0\u4ee5\u4e0a \u8fd9\u4e24\u8005\u4e4b\u95f4\u7684\u987a\u5e8f\u5c31\u76f8\u540c\u4e86.<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">test<\/span> () <\/span>{\r\n   <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'start'<\/span>)\r\n    setTimeout(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\r\n        <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'children2'<\/span>)\r\n        <span class=\"hljs-built_in\">Promise<\/span>.resolve().then(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {<span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'children2-1'<\/span>)})\r\n    }, <span class=\"hljs-number\">0<\/span>)\r\n    setTimeout(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\r\n        <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'children3'<\/span>)\r\n        <span class=\"hljs-built_in\">Promise<\/span>.resolve().then(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {<span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'children3-1'<\/span>)})\r\n    }, <span class=\"hljs-number\">0<\/span>)\r\n    <span class=\"hljs-built_in\">Promise<\/span>.resolve().then(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {<span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'children1'<\/span>)})\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'end'<\/span>) \r\n}\r\n\r\ntest()\r\n\r\n<span class=\"hljs-comment\">\/\/ \u4ee5\u4e0a\u4ee3\u7801\u5728node11\u4ee5\u4e0b\u7248\u672c\u7684\u6267\u884c\u7ed3\u679c(\u5148\u6267\u884c\u6240\u6709\u7684\u5b8f\u4efb\u52a1\uff0c\u518d\u6267\u884c\u5fae\u4efb\u52a1)<\/span>\r\n<span class=\"hljs-comment\">\/\/ start<\/span>\r\n<span class=\"hljs-comment\">\/\/ end<\/span>\r\n<span class=\"hljs-comment\">\/\/ children1<\/span>\r\n<span class=\"hljs-comment\">\/\/ children2<\/span>\r\n<span class=\"hljs-comment\">\/\/ children3<\/span>\r\n<span class=\"hljs-comment\">\/\/ children2-1<\/span>\r\n<span class=\"hljs-comment\">\/\/ children3-1<\/span>\r\n\r\n<span class=\"hljs-comment\">\/\/ \u4ee5\u4e0a\u4ee3\u7801\u5728node11\u53ca\u6d4f\u89c8\u5668\u7684\u6267\u884c\u7ed3\u679c(\u987a\u5e8f\u6267\u884c\u5b8f\u4efb\u52a1\u548c\u5fae\u4efb\u52a1)<\/span>\r\n<span class=\"hljs-comment\">\/\/ start<\/span>\r\n<span class=\"hljs-comment\">\/\/ end<\/span>\r\n<span class=\"hljs-comment\">\/\/ children1<\/span>\r\n<span class=\"hljs-comment\">\/\/ children2<\/span>\r\n<span class=\"hljs-comment\">\/\/ children2-1<\/span>\r\n<span class=\"hljs-comment\">\/\/ children3<\/span>\r\n<span class=\"hljs-comment\">\/\/ children3-1<\/span><\/code><\/pre>\n<h3 id=\"articleHeader20\">9\u3001\u7b80\u8ff0HTTPS\u4e2d\u95f4\u4eba\u653b\u51fb<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>https\u534f\u8bae\u7531 http + ssl \u534f\u8bae\u6784\u6210\uff0c\u5177\u4f53\u7684\u94fe\u63a5\u8fc7\u7a0b\u53ef\u53c2\u8003<a href=\"https:\/\/github.com\/lvwxx\/blog\/issues\/3\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">SSL\u6216TLS\u63e1\u624b\u7684\u6982\u8ff0<\/a><\/p>\n<p>\u4e2d\u95f4\u4eba\u653b\u51fb\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\u670d\u52a1\u5668\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u516c\u94a5\u3002<\/li>\n<li>\u653b\u51fb\u8005\u622a\u83b7\u516c\u94a5\uff0c\u4fdd\u7559\u5728\u81ea\u5df1\u624b\u4e0a\u3002<\/li>\n<li>\u7136\u540e\u653b\u51fb\u8005\u81ea\u5df1\u751f\u6210\u4e00\u4e2a\u3010\u4f2a\u9020\u7684\u3011\u516c\u94a5\uff0c\u53d1\u7ed9\u5ba2\u6237\u7aef\u3002<\/li>\n<li>\u5ba2\u6237\u7aef\u6536\u5230\u4f2a\u9020\u7684\u516c\u94a5\u540e\uff0c\u751f\u6210\u52a0\u5bc6hash\u503c\u53d1\u7ed9\u670d\u52a1\u5668\u3002<\/li>\n<li>\u653b\u51fb\u8005\u83b7\u5f97\u52a0\u5bc6hash\u503c\uff0c\u7528\u81ea\u5df1\u7684\u79c1\u94a5\u89e3\u5bc6\u83b7\u5f97\u771f\u79d8\u94a5\u3002<\/li>\n<li>\u540c\u65f6\u751f\u6210\u5047\u7684\u52a0\u5bc6hash\u503c\uff0c\u53d1\u7ed9\u670d\u52a1\u5668\u3002<\/li>\n<li>\u670d\u52a1\u5668\u7528\u79c1\u94a5\u89e3\u5bc6\u83b7\u5f97\u5047\u79d8\u94a5\u3002<\/li>\n<li>\u670d\u52a1\u5668\u7528\u52a0\u79d8\u94a5\u52a0\u5bc6\u4f20\u8f93\u4fe1\u606f<\/li>\n<\/ol>\n<p>\u9632\u8303\u65b9\u6cd5\uff1a<\/p>\n<ol>\n<li>\u670d\u52a1\u7aef\u5728\u53d1\u9001\u6d4f\u89c8\u5668\u7684\u516c\u94a5\u4e2d\u52a0\u5165CA\u8bc1\u4e66\uff0c\u6d4f\u89c8\u5668\u53ef\u4ee5\u9a8c\u8bc1CA\u8bc1\u4e66\u7684\u6709\u6548\u6027<\/li>\n<\/ol>\n<h3 id=\"articleHeader21\">10\u3001\u8bf4\u51e0\u6761web\u524d\u7aef\u4f18\u5316\u7b56\u7565<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>(1). \u51cf\u5c11HTTP\u8bf7\u6c42\u6570<\/p>\n<p>\u8fd9\u6761\u7b56\u7565\u57fa\u672c\u4e0a\u6240\u6709\u524d\u7aef\u4eba\u90fd\u77e5\u9053\uff0c\u800c\u4e14\u4e5f\u662f\u6700\u91cd\u8981\u6700\u6709\u6548\u7684\u3002\u90fd\u8bf4\u8981\u51cf\u5c11HTTP\u8bf7\u6c42\uff0c\u90a3\u8bf7\u6c42\u591a\u4e86\u5230\u5e95\u4f1a\u600e\u4e48\u6837\u5462\uff1f\u9996\u5148\uff0c\u6bcf\u4e2a\u8bf7\u6c42\u90fd\u662f\u6709\u6210\u672c\u7684\uff0c\u65e2\u5305 \u542b\u65f6\u95f4\u6210\u672c\u4e5f\u5305\u542b\u8d44\u6e90\u6210\u672c\u3002\u4e00\u4e2a\u5b8c\u6574\u7684\u8bf7\u6c42\u90fd\u9700\u8981\u7ecf\u8fc7DNS\u5bfb\u5740\u3001\u4e0e\u670d\u52a1\u5668\u5efa\u7acb\u8fde\u63a5\u3001\u53d1\u9001\u6570\u636e\u3001\u7b49\u5f85\u670d\u52a1\u5668\u54cd\u5e94\u3001\u63a5\u6536\u6570\u636e\u8fd9\u6837\u4e00\u4e2a\u201c\u6f2b\u957f\u201d\u800c\u590d\u6742\u7684\u8fc7\u7a0b\u3002 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\u7528\u6237\u9020\u6210\u7ad9\u70b9\u901f\u5ea6\u6162\u8fd9\u6837\u4e00\u4e2a\u5370\u8c61\uff0c\u5373\u4f7f\u53ef\u80fd\u7528\u6237\u80fd\u770b\u5230\u7684\u7b2c\u4e00\u5c4f\u7684\u8d44\u6e90\u90fd\u5df2\u7ecf\u8bf7\u6c42\u5b8c\u4e86\uff0c\u4f46\u662f\u6d4f\u89c8\u5668\u7684\u8fdb\u5ea6\u6761\u4f1a\u4e00\u76f4\u5b58\u5728\u3002\u51cf\u5c11HTTP\u8bf7\u6c42\u6570\u7684\u4e3b\u8981\u9014\u5f84\u5305\u62ec\uff1a<\/p>\n<p>(2). \u4ece\u8bbe\u8ba1\u5b9e\u73b0\u5c42\u9762\u7b80\u5316\u9875\u9762<\/p>\n<p>\u5982\u679c\u4f60\u7684\u9875\u9762\u50cf\u767e\u5ea6\u9996\u9875\u4e00\u6837\u7b80\u5355\uff0c\u90a3\u4e48\u63a5\u4e0b\u6765\u7684\u89c4\u5219\u57fa\u672c\u4e0a\u90fd\u7528\u4e0d\u7740\u4e86\u3002\u4fdd\u6301\u9875\u9762\u7b80\u6d01\u3001\u51cf\u5c11\u8d44\u6e90\u7684\u4f7f\u7528\u65f6\u6700\u76f4\u63a5\u7684\u3002\u5982\u679c\u4e0d\u662f\u8fd9\u6837\uff0c\u4f60\u7684\u9875\u9762\u9700\u8981\u534e\u4e3d\u7684\u76ae\u80a4\uff0c\u5219\u7ee7\u7eed\u9605\u8bfb\u4e0b\u9762\u7684\u5185\u5bb9\u3002<\/p>\n<p>(3). \u5408\u7406\u8bbe\u7f6eHTTP\u7f13\u5b58<\/p>\n<p>\u7f13\u5b58\u7684\u529b\u91cf\u662f\u5f3a\u5927\u7684\uff0c\u6070\u5f53\u7684\u7f13\u5b58\u8bbe\u7f6e\u53ef\u4ee5\u5927\u5927\u7684\u51cf\u5c11HTTP\u8bf7\u6c42\u3002\u4ee5\u6709\u554a\u9996\u9875\u4e3a\u4f8b\uff0c\u5f53\u6d4f\u89c8\u5668\u6ca1\u6709\u7f13\u5b58\u7684\u65f6\u5019\u8bbf\u95ee\u4e00\u5171\u4f1a\u53d1\u51fa78\u4e2a\u8bf7\u6c42\uff0c\u5171600\u591aK \u6570\u636e\uff08\u5982\u56fe1.1\uff09\uff0c\u800c\u5f53\u7b2c\u4e8c\u6b21\u8bbf\u95ee\u5373\u6d4f\u89c8\u5668\u5df2\u7f13\u5b58\u4e4b\u540e\u8bbf\u95ee\u5219\u4ec5\u670910\u4e2a\u8bf7\u6c42\uff0c\u517120\u591aK\u6570\u636e\uff08\u5982\u56fe1.2\uff09\u3002\uff08\u8fd9\u91cc\u9700\u8981\u8bf4\u660e\u7684\u662f\uff0c\u5982\u679c\u76f4\u63a5F5\u5237\u65b0\u9875\u9762 \u7684\u8bdd\u6548\u679c\u662f\u4e0d\u4e00\u6837\u7684\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\u8bf7\u6c42\u6570\u8fd8\u662f\u4e00\u6837\uff0c\u4e0d\u8fc7\u88ab\u7f13\u5b58\u8d44\u6e90\u7684\u8bf7\u6c42\u670d\u52a1\u5668\u662f304\u54cd\u5e94\uff0c\u53ea\u6709Header\u6ca1\u6709Body\uff0c\u53ef\u4ee5\u8282\u7701\u5e26\u5bbd\uff09<\/p>\n<p>\u600e\u6837\u624d\u7b97\u5408\u7406\u8bbe\u7f6e\uff1f\u539f\u5219\u5f88\u7b80\u5355\uff0c\u80fd\u7f13\u5b58\u8d8a\u591a\u8d8a\u597d\uff0c\u80fd\u7f13\u5b58\u8d8a\u4e45\u8d8a\u597d\u3002\u4f8b\u5982\uff0c\u5f88\u5c11\u53d8\u5316\u7684\u56fe\u7247\u8d44\u6e90\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7HTTP Header\u4e2d\u7684Expires\u8bbe\u7f6e\u4e00\u4e2a\u5f88\u957f\u7684\u8fc7\u671f\u5934\uff1b\u53d8\u5316\u4e0d\u9891\u7e41\u800c\u53c8\u53ef\u80fd\u4f1a\u53d8\u7684\u8d44\u6e90\u53ef\u4ee5\u4f7f\u7528Last-Modifed\u6765\u505a\u8bf7\u6c42\u9a8c\u8bc1\u3002\u5c3d\u53ef\u80fd\u7684\u8ba9\u8d44\u6e90\u80fd\u591f \u5728\u7f13\u5b58\u4e2d\u5f85\u5f97\u66f4\u4e45\u3002<\/p>\n<p>(4). \u8d44\u6e90\u5408\u5e76\u4e0e\u538b\u7f29<\/p>\n<p>\u5982\u679c\u53ef\u4ee5\u7684\u8bdd\uff0c\u5c3d\u53ef\u80fd\u7684\u5c06\u5916\u90e8\u7684\u811a\u672c\u3001\u6837\u5f0f\u8fdb\u884c\u5408\u5e76\uff0c\u591a\u4e2a\u5408\u4e3a\u4e00\u4e2a\u3002\u53e6\u5916\uff0cCSS\u3001Javascript\u3001Image\u90fd\u53ef\u4ee5\u7528\u76f8\u5e94\u7684\u5de5\u5177\u8fdb\u884c\u538b\u7f29\uff0c\u538b\u7f29\u540e\u5f80\u5f80\u80fd\u7701\u4e0b\u4e0d\u5c11\u7a7a\u95f4\u3002<\/p>\n<p>(5). CSS Sprites<\/p>\n<p>\u5408\u5e76CSS\u56fe\u7247\uff0c\u51cf\u5c11\u8bf7\u6c42\u6570\u7684\u53c8\u4e00\u4e2a\u597d\u529e\u6cd5\u3002<\/p>\n<p>(6). Inline Images<\/p>\n<p>\u4f7f\u7528data: URL scheme\u7684\u65b9\u5f0f\u5c06\u56fe\u7247\u5d4c\u5165\u5230\u9875\u9762\u6216CSS\u4e2d\uff0c\u5982\u679c\u4e0d\u8003\u8651\u8d44\u6e90\u7ba1\u7406\u4e0a\u7684\u95ee\u9898\u7684\u8bdd\uff0c\u4e0d\u5931\u4e3a\u4e00\u4e2a\u597d\u529e\u6cd5\u3002\u5982\u679c\u662f\u5d4c\u5165\u9875\u9762\u7684\u8bdd\u6362\u6765\u7684\u662f\u589e\u5927\u4e86\u9875\u9762\u7684\u4f53\u79ef\uff0c\u800c\u4e14\u65e0\u6cd5\u5229\u7528\u6d4f\u89c8\u5668\u7f13\u5b58\u3002\u4f7f\u7528\u5728CSS\u4e2d\u7684\u56fe\u7247\u5219\u66f4\u4e3a\u7406\u60f3\u4e00\u4e9b\u3002<\/p>\n<p>(7). Lazy Load Images<\/p>\n<p>\u8fd9\u6761\u7b56\u7565\u5b9e\u9645\u4e0a\u5e76\u4e0d\u4e00\u5b9a\u80fd\u51cf\u5c11HTTP\u8bf7\u6c42\u6570\uff0c\u4f46\u662f\u5374\u80fd\u5728\u67d0\u4e9b\u6761\u4ef6\u4e0b\u6216\u8005\u9875\u9762\u521a\u52a0\u8f7d\u65f6\u51cf\u5c11HTTP\u8bf7\u6c42\u6570\u3002\u5bf9\u4e8e\u56fe\u7247\u800c\u8a00\uff0c\u5728\u9875\u9762\u521a\u52a0\u8f7d\u7684\u65f6\u5019\u53ef\u4ee5\u53ea \u52a0\u8f7d\u7b2c\u4e00\u5c4f\uff0c\u5f53\u7528\u6237\u7ee7\u7eed\u5f80\u540e\u6eda\u5c4f\u7684\u65f6\u5019\u624d\u52a0\u8f7d\u540e\u7eed\u7684\u56fe\u7247\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u5047\u5982\u7528\u6237\u53ea\u5bf9\u7b2c\u4e00\u5c4f\u7684\u5185\u5bb9\u611f\u5174\u8da3\u65f6\uff0c\u90a3\u5269\u4f59\u7684\u56fe\u7247\u8bf7\u6c42\u5c31\u90fd\u8282\u7701\u4e86\u3002\u6709\u554a\u9996\u9875\u66fe\u7ecf\u7684\u505a\u6cd5 \u662f\u5728\u52a0\u8f7d\u7684\u65f6\u5019\u628a\u7b2c\u4e00\u5c4f\u4e4b\u540e\u7684\u56fe\u7247\u5730\u5740\u7f13\u5b58\u5728Textarea\u6807\u7b7e\u4e2d\uff0c\u5f85\u7528\u6237\u5f80\u4e0b\u6eda\u5c4f\u7684\u65f6\u5019\u624d\u201c\u60f0\u6027\u201d\u52a0\u8f7d\u3002<\/p>\n<h3 id=\"articleHeader22\">11\u3001\u4f60\u4e86\u89e3\u7684\u6d4f\u89c8\u5668\u7684\u91cd\u7ed8\u548c\u56de\u6d41\u5bfc\u81f4\u7684\u6027\u80fd\u95ee\u9898<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p><strong>\u91cd\u7ed8\uff08Repaint\uff09\u548c\u56de\u6d41\uff08Reflow\uff09<\/strong><\/p>\n<p>\u91cd\u7ed8\u548c\u56de\u6d41\u662f\u6e32\u67d3\u6b65\u9aa4\u4e2d\u7684\u4e00\u5c0f\u8282\uff0c\u4f46\u662f\u8fd9\u4e24\u4e2a\u6b65\u9aa4\u5bf9\u4e8e\u6027\u80fd\u5f71\u54cd\u5f88\u5927\u3002<\/p>\n<ul>\n<li>\u91cd\u7ed8\u662f\u5f53\u8282\u70b9\u9700\u8981\u66f4\u6539\u5916\u89c2\u800c\u4e0d\u4f1a\u5f71\u54cd\u5e03\u5c40\u7684\uff0c\u6bd4\u5982\u6539\u53d8\u00a0<code>color<\/code>\u5c31\u53eb\u79f0\u4e3a\u91cd\u7ed8<\/li>\n<li>\u56de\u6d41\u662f\u5e03\u5c40\u6216\u8005\u51e0\u4f55\u5c5e\u6027\u9700\u8981\u6539\u53d8\u5c31\u79f0\u4e3a\u56de\u6d41\u3002<\/li>\n<\/ul>\n<p>\u56de\u6d41\u5fc5\u5b9a\u4f1a\u53d1\u751f\u91cd\u7ed8\uff0c\u91cd\u7ed8\u4e0d\u4e00\u5b9a\u4f1a\u5f15\u53d1\u56de\u6d41\u3002\u56de\u6d41\u6240\u9700\u7684\u6210\u672c\u6bd4\u91cd\u7ed8\u9ad8\u7684\u591a\uff0c\u6539\u53d8\u6df1\u5c42\u6b21\u7684\u8282\u70b9\u5f88\u53ef\u80fd\u5bfc\u81f4\u7236\u8282\u70b9\u7684\u4e00\u7cfb\u5217\u56de\u6d41\u3002<\/p>\n<p>\u6240\u4ee5\u4ee5\u4e0b\u51e0\u4e2a\u52a8\u4f5c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\uff1a<\/p>\n<ul>\n<li>\u6539\u53d8 window \u5927\u5c0f<\/li>\n<li>\u6539\u53d8\u5b57\u4f53<\/li>\n<li>\u6dfb\u52a0\u6216\u5220\u9664\u6837\u5f0f<\/li>\n<li>\u6587\u5b57\u6539\u53d8<\/li>\n<li>\u5b9a\u4f4d\u6216\u8005\u6d6e\u52a8<\/li>\n<li>\u76d2\u6a21\u578b<\/li>\n<\/ul>\n<p>\u5f88\u591a\u4eba\u4e0d\u77e5\u9053\u7684\u662f\uff0c\u91cd\u7ed8\u548c\u56de\u6d41\u5176\u5b9e\u548c Event loop \u6709\u5173\u3002<\/p>\n<ol>\n<li>\u5f53 Event loop \u6267\u884c\u5b8c Microtasks \u540e\uff0c\u4f1a\u5224\u65ad document \u662f\u5426\u9700\u8981\u66f4\u65b0\u3002\u56e0\u4e3a\u6d4f\u89c8\u5668\u662f 60Hz \u7684\u5237\u65b0\u7387\uff0c\u6bcf 16ms \u624d\u4f1a\u66f4\u65b0\u4e00\u6b21\u3002<\/li>\n<li>\u7136\u540e\u5224\u65ad\u662f\u5426\u6709\u00a0<code>resize<\/code>\u6216\u8005\u00a0<code>scroll<\/code>\uff0c\u6709\u7684\u8bdd\u4f1a\u53bb\u89e6\u53d1\u4e8b\u4ef6\uff0c\u6240\u4ee5\u00a0<code>resize<\/code>\u548c\u00a0<code>scroll<\/code>\u4e8b\u4ef6\u4e5f\u662f\u81f3\u5c11 16ms \u624d\u4f1a\u89e6\u53d1\u4e00\u6b21\uff0c\u5e76\u4e14\u81ea\u5e26\u8282\u6d41\u529f\u80fd\u3002<\/li>\n<li>\u5224\u65ad\u662f\u5426\u89e6\u53d1\u4e86 media query<\/li>\n<li>\u66f4\u65b0\u52a8\u753b\u5e76\u4e14\u53d1\u9001\u4e8b\u4ef6<\/li>\n<li>\u5224\u65ad\u662f\u5426\u6709\u5168\u5c4f\u64cd\u4f5c\u4e8b\u4ef6<\/li>\n<li>\u6267\u884c\u00a0<code>requestAnimationFrame<\/code>\u56de\u8c03<\/li>\n<li>\u6267\u884c\u00a0<code>IntersectionObserver<\/code>\u56de\u8c03\uff0c\u8be5\u65b9\u6cd5\u7528\u4e8e\u5224\u65ad\u5143\u7d20\u662f\u5426\u53ef\u89c1\uff0c\u53ef\u4ee5\u7528\u4e8e\u61d2\u52a0\u8f7d\u4e0a\uff0c\u4f46\u662f\u517c\u5bb9\u6027\u4e0d\u597d<\/li>\n<li>\u66f4\u65b0\u754c\u9762<\/li>\n<li>\u4ee5\u4e0a\u5c31\u662f\u4e00\u5e27\u4e2d\u53ef\u80fd\u4f1a\u505a\u7684\u4e8b\u60c5\u3002\u5982\u679c\u5728\u4e00\u5e27\u4e2d\u6709\u7a7a\u95f2\u65f6\u95f4\uff0c\u5c31\u4f1a\u53bb\u6267\u884c\u00a0<code>requestIdleCallback<\/code>\u56de\u8c03\u3002<\/li>\n<\/ol>\n<p><strong>\u51cf\u5c11\u91cd\u7ed8\u548c\u56de\u6d41<\/strong><\/p>\n<ul>\n<li>\u4f7f\u7528\u00a0<code>translate<\/code>\u00a0\u66ff\u4ee3\u00a0<code>top<\/code>\n<pre class=\"xml hljs\"><code class=\"html\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">div<\/span> <span class=\"hljs-attr\">class<\/span>=<span class=\"hljs-string\">\"test\"<\/span>&gt;<\/span><span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">div<\/span>&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">style<\/span>&gt;<\/span><span class=\"css\">\r\n    <span class=\"hljs-selector-class\">.test<\/span> {\r\n        <span class=\"hljs-attribute\">position<\/span>: absolute;\r\n        <span class=\"hljs-attribute\">top<\/span>: <span class=\"hljs-number\">10px<\/span>;\r\n        <span class=\"hljs-attribute\">width<\/span>: <span class=\"hljs-number\">100px<\/span>;\r\n        <span class=\"hljs-attribute\">height<\/span>: <span class=\"hljs-number\">100px<\/span>;\r\n        <span class=\"hljs-attribute\">background<\/span>: red;\r\n    }\r\n<\/span><span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">style<\/span>&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">script<\/span>&gt;<\/span><span class=\"javascript\">\r\n    setTimeout(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ \u5f15\u8d77\u56de\u6d41<\/span>\r\n        <span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'.test'<\/span>).style.top = <span class=\"hljs-string\">'100px'<\/span>\r\n    }, <span class=\"hljs-number\">1000<\/span>)\r\n<\/span><span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">script<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n<\/li>\n<li>\u4f7f\u7528\u00a0<code>visibility<\/code>\u66ff\u6362\u00a0<code>display: none<\/code>\uff0c\u56e0\u4e3a\u524d\u8005\u53ea\u4f1a\u5f15\u8d77\u91cd\u7ed8\uff0c\u540e\u8005\u4f1a\u5f15\u53d1\u56de\u6d41\uff08\u6539\u53d8\u4e86\u5e03\u5c40\uff09\u628a DOM \u79bb\u7ebf\u540e\u4fee\u6539\uff0c\u6bd4\u5982\uff1a\u5148\u628a DOM \u7ed9\u00a0<code>display:none<\/code>(\u6709\u4e00\u6b21 Reflow)\uff0c\u7136\u540e\u4f60\u4fee\u6539100\u6b21\uff0c\u7136\u540e\u518d\u628a\u5b83\u663e\u793a\u51fa\u6765\n<p>\u4e0d\u8981\u628a DOM \u7ed3\u70b9\u7684\u5c5e\u6027\u503c\u653e\u5728\u4e00\u4e2a\u5faa\u73af\u91cc\u5f53\u6210\u5faa\u73af\u91cc\u7684\u53d8\u91cf<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-keyword\">for<\/span>(<span class=\"hljs-keyword\">let<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; <span class=\"hljs-number\">1000<\/span>; i++) {\r\n    <span class=\"hljs-comment\">\/\/ \u83b7\u53d6 offsetTop \u4f1a\u5bfc\u81f4\u56de\u6d41\uff0c\u56e0\u4e3a\u9700\u8981\u53bb\u83b7\u53d6\u6b63\u786e\u7684\u503c<\/span>\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-built_in\">document<\/span>.querySelector(<span class=\"hljs-string\">'.test'<\/span>).style.offsetTop)\r\n}\r\n<\/code><\/pre>\n<\/li>\n<li>\u4e0d\u8981\u4f7f\u7528 table \u5e03\u5c40\uff0c\u53ef\u80fd\u5f88\u5c0f\u7684\u4e00\u4e2a\u5c0f\u6539\u52a8\u4f1a\u9020\u6210\u6574\u4e2a table \u7684\u91cd\u65b0\u5e03\u5c40<\/li>\n<li>\u52a8\u753b\u5b9e\u73b0\u7684\u901f\u5ea6\u7684\u9009\u62e9\uff0c\u52a8\u753b\u901f\u5ea6\u8d8a\u5feb\uff0c\u56de\u6d41\u6b21\u6570\u8d8a\u591a\uff0c\u4e5f\u53ef\u4ee5\u9009\u62e9\u4f7f\u7528\u00a0<code>requestAnimationFrame<\/code><\/li>\n<li>CSS \u9009\u62e9\u7b26\u4ece\u53f3\u5f80\u5de6\u5339\u914d\u67e5\u627e\uff0c\u907f\u514d DOM \u6df1\u5ea6\u8fc7\u6df1<\/li>\n<li>\u5c06\u9891\u7e41\u8fd0\u884c\u7684\u52a8\u753b\u53d8\u4e3a\u56fe\u5c42\uff0c\u56fe\u5c42\u80fd\u591f\u963b\u6b62\u8be5\u8282\u70b9\u56de\u6d41\u5f71\u54cd\u522b\u7684\u5143\u7d20\u3002\u6bd4\u5982\u5bf9\u4e8e\u00a0<code>video<\/code>\u6807\u7b7e\uff0c\u6d4f\u89c8\u5668\u4f1a\u81ea\u52a8\u5c06\u8be5\u8282\u70b9\u53d8\u4e3a\u56fe\u5c42\u3002<\/li>\n<\/ul>\n<h2 id=\"articleHeader23\">react\u3001Vue<\/h2>\n<h3 id=\"articleHeader24\">1\u3001\u5199 React \/ Vue \u9879\u76ee\u65f6\u4e3a\u4ec0\u4e48\u8981\u5728\u5217\u8868\u7ec4\u4ef6\u4e2d\u5199 key\uff0c\u5176\u4f5c\u7528\u662f\u4ec0\u4e48\uff1f<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>vue\u548creact\u90fd\u662f\u91c7\u7528diff\u7b97\u6cd5\u6765\u5bf9\u6bd4\u65b0\u65e7\u865a\u62df\u8282\u70b9\uff0c\u4ece\u800c\u66f4\u65b0\u8282\u70b9\u3002\u5728vue\u7684diff\u51fd\u6570\u4e2d\uff08\u5efa\u8bae\u5148\u4e86\u89e3\u4e00\u4e0bdiff\u7b97\u6cd5\u8fc7\u7a0b\uff09\u3002<br \/>\n\u5728\u4ea4\u53c9\u5bf9\u6bd4\u4e2d\uff0c\u5f53\u65b0\u8282\u70b9\u8ddf\u65e7\u8282\u70b9<code>\u5934\u5c3e\u4ea4\u53c9\u5bf9\u6bd4<\/code>\u6ca1\u6709\u7ed3\u679c\u65f6\uff0c\u4f1a\u6839\u636e\u65b0\u8282\u70b9\u7684key\u53bb\u5bf9\u6bd4\u65e7\u8282\u70b9\u6570\u7ec4\u4e2d\u7684key\uff0c\u4ece\u800c\u627e\u5230\u76f8\u5e94\u65e7\u8282\u70b9\uff08\u8fd9\u91cc\u5bf9\u5e94\u7684\u662f\u4e00\u4e2akey =&gt; index \u7684map\u6620\u5c04\uff09\u3002\u5982\u679c\u6ca1\u627e\u5230\u5c31\u8ba4\u4e3a\u662f\u4e00\u4e2a\u65b0\u589e\u8282\u70b9\u3002\u800c\u5982\u679c\u6ca1\u6709key\uff0c\u90a3\u4e48\u5c31\u4f1a\u91c7\u7528\u904d\u5386\u67e5\u627e\u7684\u65b9\u5f0f\u53bb\u627e\u5230\u5bf9\u5e94\u7684\u65e7\u8282\u70b9\u3002\u4e00\u79cd\u4e00\u4e2amap\u6620\u5c04\uff0c\u53e6\u4e00\u79cd\u662f\u904d\u5386\u67e5\u627e\u3002\u76f8\u6bd4\u800c\u8a00\u3002map\u6620\u5c04\u7684\u901f\u5ea6\u66f4\u5feb\u3002<br \/>\nvue\u90e8\u5206\u6e90\u7801\u5982\u4e0b\uff1a<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-comment\">\/\/ vue\u9879\u76ee  src\/core\/vdom\/patch.js  -488\u884c<\/span>\r\n<span class=\"hljs-comment\">\/\/ \u4ee5\u4e0b\u662f\u4e3a\u4e86\u9605\u8bfb\u6027\u8fdb\u884c\u683c\u5f0f\u5316\u540e\u7684\u4ee3\u7801<\/span>\r\n\r\n<span class=\"hljs-comment\">\/\/ oldCh \u662f\u4e00\u4e2a\u65e7\u865a\u62df\u8282\u70b9\u6570\u7ec4<\/span>\r\n<span class=\"hljs-keyword\">if<\/span> (isUndef(oldKeyToIdx)) {\r\n  oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx)\r\n}\r\n<span class=\"hljs-keyword\">if<\/span>(isDef(newStartVnode.key)) {\r\n  <span class=\"hljs-comment\">\/\/ map \u65b9\u5f0f\u83b7\u53d6<\/span>\r\n  idxInOld = oldKeyToIdx[newStartVnode.key]\r\n} <span class=\"hljs-keyword\">else<\/span> {\r\n  <span class=\"hljs-comment\">\/\/ \u904d\u5386\u65b9\u5f0f\u83b7\u53d6<\/span>\r\n  idxInOld = findIdxInOld(newStartVnode, oldCh, oldStartIdx, oldEndIdx)\r\n}<\/code><\/pre>\n<p>\u521b\u5efamap\u51fd\u6570<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">createKeyToOldIdx<\/span> (<span class=\"hljs-params\">children, beginIdx, endIdx<\/span>) <\/span>{\r\n  <span class=\"hljs-keyword\">let<\/span> i, key\r\n  <span class=\"hljs-keyword\">const<\/span> map = {}\r\n  <span class=\"hljs-keyword\">for<\/span> (i = beginIdx; i &lt;= endIdx; ++i) {\r\n    key = children[i].key\r\n    <span class=\"hljs-keyword\">if<\/span> (isDef(key)) map[key] = i\r\n  }\r\n  <span class=\"hljs-keyword\">return<\/span> map\r\n}<\/code><\/pre>\n<p>\u904d\u5386\u5bfb\u627e<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-comment\">\/\/ sameVnode \u662f\u5bf9\u6bd4\u65b0\u65e7\u8282\u70b9\u662f\u5426\u76f8\u540c\u7684\u51fd\u6570<\/span>\r\n <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">findIdxInOld<\/span> (<span class=\"hljs-params\">node, oldCh, start, end<\/span>) <\/span>{\r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">let<\/span> i = start; i &lt; end; i++) {\r\n      <span class=\"hljs-keyword\">const<\/span> c = oldCh[i]\r\n      \r\n      <span class=\"hljs-keyword\">if<\/span> (isDef(c) &amp;&amp; sameVnode(node, c)) <span class=\"hljs-keyword\">return<\/span> i\r\n    }\r\n  }<\/code><\/pre>\n<h3 id=\"articleHeader25\">2\u3001React \u4e2d setState \u4ec0\u4e48\u65f6\u5019\u662f\u540c\u6b65\u7684\uff0c\u4ec0\u4e48\u65f6\u5019\u662f\u5f02\u6b65\u7684\uff1f<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u5728React\u4e2d\uff0c<strong>\u5982\u679c\u662f\u7531React\u5f15\u53d1\u7684\u4e8b\u4ef6\u5904\u7406\uff08\u6bd4\u5982\u901a\u8fc7onClick\u5f15\u53d1\u7684\u4e8b\u4ef6\u5904\u7406\uff09\uff0c\u8c03\u7528setState\u4e0d\u4f1a\u540c\u6b65\u66f4\u65b0this.state\uff0c\u9664\u6b64\u4e4b\u5916\u7684setState\u8c03\u7528\u4f1a\u540c\u6b65\u6267\u884cthis.state<\/strong>\u3002\u6240\u8c13\u201c\u9664\u6b64\u4e4b\u5916\u201d\uff0c\u6307\u7684\u662f\u7ed5\u8fc7React\u901a\u8fc7addEventListener\u76f4\u63a5\u6dfb\u52a0\u7684\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\uff0c\u8fd8\u6709\u901a\u8fc7setTimeout\/setInterval\u4ea7\u751f\u7684\u5f02\u6b65\u8c03\u7528\u3002<\/p>\n<p><strong>\u539f\u56e0\uff1a<\/strong>\u5728React\u7684setState\u51fd\u6570\u5b9e\u73b0\u4e2d\uff0c\u4f1a\u6839\u636e\u4e00\u4e2a\u53d8\u91cfisBatchingUpdates\u5224\u65ad\u662f\u76f4\u63a5\u66f4\u65b0this.state\u8fd8\u662f\u653e\u5230\u961f\u5217\u4e2d\u56de\u5934\u518d\u8bf4\uff0c\u800cisBatchingUpdates\u9ed8\u8ba4\u662ffalse\uff0c\u4e5f\u5c31\u8868\u793asetState\u4f1a\u540c\u6b65\u66f4\u65b0this.state\uff0c\u4f46\u662f\uff0c<strong>\u6709\u4e00\u4e2a\u51fd\u6570batchedUpdates\uff0c\u8fd9\u4e2a\u51fd\u6570\u4f1a\u628aisBatchingUpdates\u4fee\u6539\u4e3atrue\uff0c\u800c\u5f53React\u5728\u8c03\u7528\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u4e4b\u524d\u5c31\u4f1a\u8c03\u7528\u8fd9\u4e2abatchedUpdates\uff0c\u9020\u6210\u7684\u540e\u679c\uff0c\u5c31\u662f\u7531React\u63a7\u5236\u7684\u4e8b\u4ef6\u5904\u7406\u8fc7\u7a0bsetState\u4e0d\u4f1a\u540c\u6b65\u66f4\u65b0this.state<\/strong>\u3002<\/p>\n<h3 id=\"articleHeader26\">3\u3001\u4e0b\u9762\u8f93\u51fa\u4ec0\u4e48<\/h3>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Example<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title\">React<\/span>.<span class=\"hljs-title\">Component<\/span> <\/span>{\r\n  <span class=\"hljs-keyword\">constructor<\/span>() {\r\n    <span class=\"hljs-keyword\">super<\/span>();\r\n    <span class=\"hljs-keyword\">this<\/span>.state = {\r\n      <span class=\"hljs-attr\">val<\/span>: <span class=\"hljs-number\">0<\/span>\r\n    };\r\n  }\r\n  \r\n  componentDidMount() {\r\n    <span class=\"hljs-keyword\">this<\/span>.setState({<span class=\"hljs-attr\">val<\/span>: <span class=\"hljs-keyword\">this<\/span>.state.val + <span class=\"hljs-number\">1<\/span>});\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-keyword\">this<\/span>.state.val);    <span class=\"hljs-comment\">\/\/ \u7b2c 1 \u6b21 log<\/span>\r\n\r\n    <span class=\"hljs-keyword\">this<\/span>.setState({<span class=\"hljs-attr\">val<\/span>: <span class=\"hljs-keyword\">this<\/span>.state.val + <span class=\"hljs-number\">1<\/span>});\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-keyword\">this<\/span>.state.val);    <span class=\"hljs-comment\">\/\/ \u7b2c 2 \u6b21 log<\/span>\r\n\r\n    setTimeout(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\r\n      <span class=\"hljs-keyword\">this<\/span>.setState({<span class=\"hljs-attr\">val<\/span>: <span class=\"hljs-keyword\">this<\/span>.state.val + <span class=\"hljs-number\">1<\/span>});\r\n      <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-keyword\">this<\/span>.state.val);  <span class=\"hljs-comment\">\/\/ \u7b2c 3 \u6b21 log<\/span>\r\n\r\n      <span class=\"hljs-keyword\">this<\/span>.setState({<span class=\"hljs-attr\">val<\/span>: <span class=\"hljs-keyword\">this<\/span>.state.val + <span class=\"hljs-number\">1<\/span>});\r\n      <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-keyword\">this<\/span>.state.val);  <span class=\"hljs-comment\">\/\/ \u7b2c 4 \u6b21 log<\/span>\r\n    }, <span class=\"hljs-number\">0<\/span>);\r\n  }\r\n\r\n  render() {\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">null<\/span>;\r\n  }\r\n};\r\n<\/code><\/pre>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-number\">1<\/span>\u3001\u7b2c\u4e00\u6b21\u548c\u7b2c\u4e8c\u6b21\u90fd\u662f\u5728 react \u81ea\u8eab\u751f\u547d\u5468\u671f\u5185\uff0c\u89e6\u53d1\u65f6 isBatchingUpdates \u4e3a <span class=\"hljs-literal\">true<\/span>\uff0c\u6240\u4ee5\u5e76\u4e0d\u4f1a\u76f4\u63a5\u6267\u884c\u66f4\u65b0 state\uff0c\u800c\u662f\u52a0\u5165\u4e86 dirtyComponents\uff0c\u6240\u4ee5\u6253\u5370\u65f6\u83b7\u53d6\u7684\u90fd\u662f\u66f4\u65b0\u524d\u7684\u72b6\u6001 <span class=\"hljs-number\">0<\/span>\u3002\r\n\r\n<span class=\"hljs-number\">2<\/span>\u3001\u4e24\u6b21 setState \u65f6\uff0c\u83b7\u53d6\u5230 <span class=\"hljs-keyword\">this<\/span>.state.val \u90fd\u662f <span class=\"hljs-number\">0<\/span>\uff0c\u6240\u4ee5\u6267\u884c\u65f6\u90fd\u662f\u5c06 <span class=\"hljs-number\">0<\/span> \u8bbe\u7f6e\u6210 <span class=\"hljs-number\">1<\/span>\uff0c\u5728 react \u5185\u90e8\u4f1a\u88ab\u5408\u5e76\u6389\uff0c\u53ea\u6267\u884c\u4e00\u6b21\u3002\u8bbe\u7f6e\u5b8c\u6210\u540e state.val \u503c\u4e3a <span class=\"hljs-number\">1<\/span>\u3002\r\n\r\n<span class=\"hljs-number\">3<\/span>\u3001setTimeout \u4e2d\u7684\u4ee3\u7801\uff0c\u89e6\u53d1\u65f6 isBatchingUpdates \u4e3a <span class=\"hljs-literal\">false<\/span>\uff0c\u6240\u4ee5\u80fd\u591f\u76f4\u63a5\u8fdb\u884c\u66f4\u65b0\uff0c\u6240\u4ee5\u8fde\u7740\u8f93\u51fa <span class=\"hljs-number\">2<\/span>\uff0c<span class=\"hljs-number\">3<\/span>\u3002\r\n\r\n\u8f93\u51fa\uff1a <span class=\"hljs-number\">0<\/span> <span class=\"hljs-number\">0<\/span> <span class=\"hljs-number\">2<\/span> <span class=\"hljs-number\">3<\/span><\/code><\/pre>\n<h3 id=\"articleHeader27\">4\u3001\u4e3a\u4ec0\u4e48\u865a\u62dfdom\u4f1a\u63d0\u9ad8\u6027\u80fd?<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u865a\u62dfdom\u76f8\u5f53\u4e8e\u5728js\u548c\u771f\u5b9edom\u4e2d\u95f4\u52a0\u4e86\u4e00\u4e2a\u7f13\u5b58\uff0c\u5229\u7528dom diff\u7b97\u6cd5\u907f\u514d\u4e86\u6ca1\u6709\u5fc5\u8981\u7684dom\u64cd\u4f5c\uff0c\u4ece\u800c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<p>\u5177\u4f53\u5b9e\u73b0\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n<p>\u7528 JavaScript \u5bf9\u8c61\u7ed3\u6784\u8868\u793a DOM \u6811\u7684\u7ed3\u6784\uff1b\u7136\u540e\u7528\u8fd9\u4e2a\u6811\u6784\u5efa\u4e00\u4e2a\u771f\u6b63\u7684 DOM \u6811\uff0c\u63d2\u5230\u6587\u6863\u5f53\u4e2d<\/p>\n<p>\u5f53\u72b6\u6001\u53d8\u66f4\u7684\u65f6\u5019\uff0c\u91cd\u65b0\u6784\u9020\u4e00\u68f5\u65b0\u7684\u5bf9\u8c61\u6811\u3002\u7136\u540e\u7528\u65b0\u7684\u6811\u548c\u65e7\u7684\u6811\u8fdb\u884c\u6bd4\u8f83\uff0c\u8bb0\u5f55\u4e24\u68f5\u6811\u5dee\u5f02<\/p>\n<p>\u628a2\u6240\u8bb0\u5f55\u7684\u5dee\u5f02\u5e94\u7528\u5230\u6b65\u9aa41\u6240\u6784\u5efa\u7684\u771f\u6b63\u7684DOM\u6811\u4e0a\uff0c\u89c6\u56fe\u5c31\u66f4\u65b0\u4e86\u3002<\/p>\n<h2 id=\"articleHeader28\">css<\/h2>\n<h3 id=\"articleHeader29\">1\u3001\u5206\u6790\u6bd4\u8f83 opacity: 0\u3001visibility: hidden\u3001display: none \u4f18\u52a3\u548c\u9002\u7528\u573a\u666f<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u7ed3\u6784\uff1a<br \/>\ndisplay:none: \u4f1a\u8ba9\u5143\u7d20\u5b8c\u5168\u4ece\u6e32\u67d3\u6811\u4e2d\u6d88\u5931\uff0c\u6e32\u67d3\u7684\u65f6\u5019\u4e0d\u5360\u636e\u4efb\u4f55\u7a7a\u95f4, \u4e0d\u80fd\u70b9\u51fb\uff0c<br \/>\nvisibility: hidden:\u4e0d\u4f1a\u8ba9\u5143\u7d20\u4ece\u6e32\u67d3\u6811\u6d88\u5931\uff0c\u6e32\u67d3\u5143\u7d20\u7ee7\u7eed\u5360\u636e\u7a7a\u95f4\uff0c\u53ea\u662f\u5185\u5bb9\u4e0d\u53ef\u89c1\uff0c\u4e0d\u80fd\u70b9\u51fb<br \/>\nopacity: 0: \u4e0d\u4f1a\u8ba9\u5143\u7d20\u4ece\u6e32\u67d3\u6811\u6d88\u5931\uff0c\u6e32\u67d3\u5143\u7d20\u7ee7\u7eed\u5360\u636e\u7a7a\u95f4\uff0c\u53ea\u662f\u5185\u5bb9\u4e0d\u53ef\u89c1\uff0c\u53ef\u4ee5\u70b9\u51fb<\/p>\n<p>\u7ee7\u627f\uff1a<br \/>\ndisplay: none\u548copacity: 0\uff1a\u662f\u975e\u7ee7\u627f\u5c5e\u6027\uff0c\u5b50\u5b59\u8282\u70b9\u6d88\u5931\u7531\u4e8e\u5143\u7d20\u4ece\u6e32\u67d3\u6811\u6d88\u5931\u9020\u6210\uff0c\u901a\u8fc7\u4fee\u6539\u5b50\u5b59\u8282\u70b9\u5c5e\u6027\u65e0\u6cd5\u663e\u793a\u3002<br \/>\nvisibility: hidden\uff1a\u662f\u7ee7\u627f\u5c5e\u6027\uff0c\u5b50\u5b59\u8282\u70b9\u6d88\u5931\u7531\u4e8e\u7ee7\u627f\u4e86hidden\uff0c\u901a\u8fc7\u8bbe\u7f6evisibility: visible;\u53ef\u4ee5\u8ba9\u5b50\u5b59\u8282\u70b9\u663e\u5f0f\u3002<\/p>\n<p>\u6027\u80fd\uff1a<br \/>\ndisplaynone : \u4fee\u6539\u5143\u7d20\u4f1a\u9020\u6210\u6587\u6863\u56de\u6d41,\u8bfb\u5c4f\u5668\u4e0d\u4f1a\u8bfb\u53d6display: none\u5143\u7d20\u5185\u5bb9\uff0c\u6027\u80fd\u6d88\u8017\u8f83\u5927<br \/>\nvisibility:hidden: \u4fee\u6539\u5143\u7d20\u53ea\u4f1a\u9020\u6210\u672c\u5143\u7d20\u7684\u91cd\u7ed8,\u6027\u80fd\u6d88\u8017\u8f83\u5c11\u8bfb\u5c4f\u5668\u8bfb\u53d6visibility: hidden\u5143\u7d20\u5185\u5bb9<br \/>\nopacity: 0 \uff1a \u4fee\u6539\u5143\u7d20\u4f1a\u9020\u6210\u91cd\u7ed8\uff0c\u6027\u80fd\u6d88\u8017\u8f83\u5c11<\/p>\n<p>\u8054\u7cfb\uff1a\u5b83\u4eec\u90fd\u80fd\u8ba9\u5143\u7d20\u4e0d\u53ef\u89c1<\/p>\n<h3 id=\"articleHeader30\">2\u3001\u6e05\u9664\u6d6e\u52a8\u7684\u65b9\u5f0f\u6709\u54ea\u4e9b?\u6bd4\u8f83\u597d\u7684\u662f\u54ea\u4e00\u79cd?<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u5e38\u7528\u7684\u4e00\u822c\u4e3a\u4e09\u79cd<code>.clearfix<\/code>,\u00a0<code>clear:both<\/code>,<code>overflow:hidden<\/code>;<\/p>\n<p>\u6bd4\u8f83\u597d\u662f\u00a0<code>.clearfix<\/code>,\u4f2a\u5143\u7d20\u4e07\u91d1\u6cb9\u7248\u672c,\u540e\u4e24\u8005\u6709\u5c40\u9650\u6027.<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\">.clearfix:after {\r\n  <span class=\"hljs-attr\">visibility<\/span>: hidden;\r\n  display: block;\r\n  font-size: <span class=\"hljs-number\">0<\/span>;\r\n  content: <span class=\"hljs-string\">\" \"<\/span>;\r\n  clear: both;\r\n  height: <span class=\"hljs-number\">0<\/span>;\r\n}\r\n\r\n&lt;!--\r\n\u4e3a\u6bdb\u6ca1\u6709 zoom ,_height \u8fd9\u4e9b,IE6,<span class=\"hljs-number\">7<\/span>\u8fd9\u7c7b\u9700\u8981 csshack \u4e0d\u518d\u6211\u4eec\u8003\u8651\u4e4b\u5185\u4e86\r\n.clearfix \u8fd8\u6709\u53e6\u5916\u4e00\u79cd\u5199\u6cd5,\r\n--&gt;\r\n\r\n.clearfix:before, .clearfix:after {\r\n    <span class=\"hljs-attr\">content<\/span>:<span class=\"hljs-string\">\"\"<\/span>;\r\n    display:table;\r\n}\r\n.clearfix:after{\r\n    <span class=\"hljs-attr\">clear<\/span>:both;\r\n    overflow:hidden;\r\n}\r\n.clearfix{\r\n    <span class=\"hljs-attr\">zoom<\/span>:<span class=\"hljs-number\">1<\/span>;\r\n}\r\n\r\n&lt;!--\r\n\u7528display:table \u662f\u4e3a\u4e86\u907f\u514d\u5916\u8fb9\u8dddmargin\u91cd\u53e0\u5bfc\u81f4\u7684margin\u584c\u9677,\r\n\u5185\u90e8\u5143\u7d20\u9ed8\u8ba4\u4f1a\u6210\u4e3a table-cell \u5355\u5143\u683c\u7684\u5f62\u5f0f\r\n--&gt;\r\n<\/code><\/pre>\n<p><code>clear:both<\/code>:\u82e5\u662f\u7528\u5728\u540c\u4e00\u4e2a\u5bb9\u5668\u5185\u76f8\u90bb\u5143\u7d20\u4e0a,\u90a3\u662f\u8d3c\u597d\u7684,\u6709\u65f6\u5019\u5728\u5bb9\u5668\u5916\u5c31\u6709\u4e9b\u95ee\u9898\u4e86, \u6bd4\u5982\u76f8\u90bb\u5bb9\u5668\u7684\u5305\u88f9\u5c42\u5143\u7d20\u584c\u9677<\/p>\n<p><code>overflow:hidden<\/code>:\u8fd9\u79cd\u82e5\u662f\u7528\u5728\u540c\u4e2a\u5bb9\u5668\u5185,\u53ef\u4ee5\u5f62\u6210\u00a0<code>BFC<\/code>\u907f\u514d\u6d6e\u52a8\u9020\u6210\u7684\u5143\u7d20\u584c\u9677<\/p>\n<h3 id=\"articleHeader31\">4\u3001css sprite \u662f\u4ec0\u4e48,\u6709\u4ec0\u4e48\u4f18\u7f3a\u70b9<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u6982\u5ff5\uff1a\u5c06\u591a\u4e2a\u5c0f\u56fe\u7247\u62fc\u63a5\u5230\u4e00\u4e2a\u56fe\u7247\u4e2d\u3002\u901a\u8fc7 background-position \u548c\u5143\u7d20\u5c3a\u5bf8\u8c03\u8282\u9700\u8981\u663e\u793a\u7684\u80cc\u666f\u56fe\u6848\u3002<\/p>\n<p>\u4f18\u70b9\uff1a<\/p>\n<ol>\n<li>\u51cf\u5c11 HTTP \u8bf7\u6c42\u6570\uff0c\u6781\u5927\u5730\u63d0\u9ad8\u9875\u9762\u52a0\u8f7d\u901f\u5ea6<\/li>\n<li>\u589e\u52a0\u56fe\u7247\u4fe1\u606f\u91cd\u590d\u5ea6\uff0c\u63d0\u9ad8\u538b\u7f29\u6bd4\uff0c\u51cf\u5c11\u56fe\u7247\u5927\u5c0f<\/li>\n<li>\u66f4\u6362\u98ce\u683c\u65b9\u4fbf\uff0c\u53ea\u9700\u5728\u4e00\u5f20\u6216\u51e0\u5f20\u56fe\u7247\u4e0a\u4fee\u6539\u989c\u8272\u6216\u6837\u5f0f\u5373\u53ef\u5b9e\u73b0<\/li>\n<\/ol>\n<p>\u7f3a\u70b9\uff1a<\/p>\n<ol>\n<li>\u56fe\u7247\u5408\u5e76\u9ebb\u70e6<\/li>\n<li>\u7ef4\u62a4\u9ebb\u70e6\uff0c\u4fee\u6539\u4e00\u4e2a\u56fe\u7247\u53ef\u80fd\u9700\u8981\u91cd\u65b0\u5e03\u5c40\u6574\u4e2a\u56fe\u7247\uff0c\u6837\u5f0f<\/li>\n<\/ol>\n<h3 id=\"articleHeader32\">5\u3001<code>link<\/code>\u4e0e<code>@import<\/code>\u7684\u533a\u522b<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<ol>\n<li><code>link<\/code>\u662f HTML \u65b9\u5f0f\uff0c\u00a0<code>@import<\/code>\u662f CSS \u65b9\u5f0f<\/li>\n<li><code>link<\/code>\u6700\u5927\u9650\u5ea6\u652f\u6301\u5e76\u884c\u4e0b\u8f7d\uff0c<code>@import<\/code>\u8fc7\u591a\u5d4c\u5957\u5bfc\u81f4\u4e32\u884c\u4e0b\u8f7d\uff0c\u51fa\u73b0<a href=\"http:\/\/www.bluerobot.com\/web\/css\/fouc.asp\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">FOUC<\/a><\/li>\n<li><code>link<\/code>\u53ef\u4ee5\u901a\u8fc7<code>rel=\"alternate stylesheet\"<\/code>\u6307\u5b9a\u5019\u9009\u6837\u5f0f<\/li>\n<li>\u6d4f\u89c8\u5668\u5bf9<code>link<\/code>\u652f\u6301\u65e9\u4e8e<code>@import<\/code>\uff0c\u53ef\u4ee5\u4f7f\u7528<code>@import<\/code>\u5bf9\u8001\u6d4f\u89c8\u5668\u9690\u85cf\u6837\u5f0f<\/li>\n<li><code>@import<\/code>\u5fc5\u987b\u5728\u6837\u5f0f\u89c4\u5219\u4e4b\u524d\uff0c\u53ef\u4ee5\u5728 css \u6587\u4ef6\u4e2d\u5f15\u7528\u5176\u4ed6\u6587\u4ef6<\/li>\n<li>\u603b\u4f53\u6765\u8bf4\uff1a<strong>link \u4f18\u4e8e@import<\/strong><\/li>\n<\/ol>\n<h3 id=\"articleHeader33\">6\u3001<code>display: block;<\/code>\u548c<code>display: inline;<\/code>\u7684\u533a\u522b<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p><code>block<\/code>\u5143\u7d20\u7279\u70b9\uff1a<\/p>\n<p>1.\u5904\u4e8e\u5e38\u89c4\u6d41\u4e2d\u65f6\uff0c\u5982\u679c<code>width<\/code>\u6ca1\u6709\u8bbe\u7f6e\uff0c\u4f1a\u81ea\u52a8\u586b\u5145\u6ee1\u7236\u5bb9\u5668 2.\u53ef\u4ee5\u5e94\u7528<code>margin\/padding<\/code>\u00a03.\u5728\u6ca1\u6709\u8bbe\u7f6e\u9ad8\u5ea6\u7684\u60c5\u51b5\u4e0b\u4f1a\u6269\u5c55\u9ad8\u5ea6\u4ee5\u5305\u542b\u5e38\u89c4\u6d41\u4e2d\u7684\u5b50\u5143\u7d20 4.\u5904\u4e8e\u5e38\u89c4\u6d41\u4e2d\u65f6\u5e03\u5c40\u65f6\u5728\u524d\u540e\u5143\u7d20\u4f4d\u7f6e\u4e4b\u95f4\uff08\u72ec\u5360\u4e00\u4e2a\u6c34\u5e73\u7a7a\u95f4\uff09 5.\u5ffd\u7565<code>vertical-align<\/code><\/p>\n<p><code>inline<\/code>\u5143\u7d20\u7279\u70b9<\/p>\n<p>1.\u6c34\u5e73\u65b9\u5411\u4e0a\u6839\u636e<code>direction<\/code>\u4f9d\u6b21\u5e03\u5c40<\/p>\n<p>2.\u4e0d\u4f1a\u5728\u5143\u7d20\u524d\u540e\u8fdb\u884c\u6362\u884c<\/p>\n<p>3.\u53d7<code>white-space<\/code>\u63a7\u5236<\/p>\n<p>4.<code>margin\/padding<\/code>\u5728\u7ad6\u76f4\u65b9\u5411\u4e0a\u65e0\u6548\uff0c\u6c34\u5e73\u65b9\u5411\u4e0a\u6709\u6548<\/p>\n<p>5.<code>width\/height<\/code>\u5c5e\u6027\u5bf9\u975e\u66ff\u6362\u884c\u5185\u5143\u7d20\u65e0\u6548\uff0c\u5bbd\u5ea6\u7531\u5143\u7d20\u5185\u5bb9\u51b3\u5b9a<\/p>\n<p>6.\u975e\u66ff\u6362\u884c\u5185\u5143\u7d20\u7684\u884c\u6846\u9ad8\u7531<code>line-height<\/code>\u786e\u5b9a\uff0c\u66ff\u6362\u884c\u5185\u5143\u7d20\u7684\u884c\u6846\u9ad8\u7531<code>height<\/code>,<code>margin<\/code>,<code>padding<\/code>,<code>border<\/code>\u51b3\u5b9a<br \/>\n7.\u6d6e\u52a8\u6216\u7edd\u5bf9\u5b9a\u4f4d\u65f6\u4f1a\u8f6c\u6362\u4e3a<code>block<\/code><br \/>\n8.<code>vertical-align<\/code>\u5c5e\u6027\u751f\u6548<\/p>\n<h3 id=\"articleHeader34\">7\u3001\u5bb9\u5668\u5305\u542b\u82e5\u5e72\u6d6e\u52a8\u5143\u7d20\u65f6\u5982\u4f55\u6e05\u7406\u6d6e\u52a8<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<ol>\n<li>\u5bb9\u5668\u5143\u7d20\u95ed\u5408\u6807\u7b7e\u524d\u6dfb\u52a0\u989d\u5916\u5143\u7d20\u5e76\u8bbe\u7f6e<code>clear: both<\/code><\/li>\n<li>\u7236\u5143\u7d20\u89e6\u53d1\u5757\u7ea7\u683c\u5f0f\u5316\u4e0a\u4e0b\u6587(\u89c1\u5757\u7ea7\u53ef\u89c6\u5316\u4e0a\u4e0b\u6587\u90e8\u5206)<\/li>\n<li>\u8bbe\u7f6e\u5bb9\u5668\u5143\u7d20\u4f2a\u5143\u7d20\u8fdb\u884c\u6e05\u7406<a href=\"http:\/\/nicolasgallagher.com\/micro-clearfix-hack\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">\u63a8\u8350\u7684\u6e05\u7406\u6d6e\u52a8\u65b9\u6cd5<\/a><\/li>\n<\/ol>\n<pre class=\"css hljs\"><code class=\"css\"><span class=\"hljs-comment\">\/**\r\n* \u5728\u6807\u51c6\u6d4f\u89c8\u5668\u4e0b\u4f7f\u7528\r\n* 1 content\u5185\u5bb9\u4e3a\u7a7a\u683c\u7528\u4e8e\u4fee\u590dopera\u4e0b\u6587\u6863\u4e2d\u51fa\u73b0\r\n*   contenteditable\u5c5e\u6027\u65f6\u5728\u6e05\u7406\u6d6e\u52a8\u5143\u7d20\u4e0a\u4e0b\u7684\u7a7a\u767d\r\n* 2 \u4f7f\u7528display\u4f7f\u7528table\u800c\u4e0d\u662fblock\uff1a\u53ef\u4ee5\u9632\u6b62\u5bb9\u5668\u548c\r\n*   \u5b50\u5143\u7d20top-margin\u6298\u53e0,\u8fd9\u6837\u80fd\u4f7f\u6e05\u7406\u6548\u679c\u4e0eBFC\uff0cIE6\/7\r\n*   zoom: 1;\u4e00\u81f4\r\n**\/<\/span>\r\n\r\n<span class=\"hljs-selector-class\">.clearfix<\/span><span class=\"hljs-selector-pseudo\">:before<\/span>,\r\n<span class=\"hljs-selector-class\">.clearfix<\/span><span class=\"hljs-selector-pseudo\">:after<\/span> {\r\n    <span class=\"hljs-attribute\">content<\/span>: <span class=\"hljs-string\">\" \"<\/span>; <span class=\"hljs-comment\">\/* 1 *\/<\/span>\r\n    <span class=\"hljs-attribute\">display<\/span>: table; <span class=\"hljs-comment\">\/* 2 *\/<\/span>\r\n}\r\n\r\n<span class=\"hljs-selector-class\">.clearfix<\/span><span class=\"hljs-selector-pseudo\">:after<\/span> {\r\n    <span class=\"hljs-attribute\">clear<\/span>: both;\r\n}\r\n\r\n<span class=\"hljs-comment\">\/**\r\n* IE 6\/7\u4e0b\u4f7f\u7528\r\n* \u901a\u8fc7\u89e6\u53d1hasLayout\u5b9e\u73b0\u5305\u542b\u6d6e\u52a8\r\n**\/<\/span>\r\n<span class=\"hljs-selector-class\">.clearfix<\/span> {\r\n    *<span class=\"hljs-attribute\">zoom<\/span>: <span class=\"hljs-number\">1<\/span>;\r\n}<\/code><\/pre>\n<h3 id=\"articleHeader35\">8\u3001PNG,GIF,JPG \u7684\u533a\u522b\u53ca\u5982\u4f55\u9009<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p><strong>GIF<\/strong>:<\/p>\n<ol>\n<li>8 \u4f4d\u50cf\u7d20\uff0c256 \u8272<\/li>\n<li>\u65e0\u635f\u538b\u7f29<\/li>\n<li>\u652f\u6301\u7b80\u5355\u52a8\u753b<\/li>\n<li>\u652f\u6301 boolean \u900f\u660e<\/li>\n<li>\u9002\u5408\u7b80\u5355\u52a8\u753b<\/li>\n<\/ol>\n<p><strong>JPEG<\/strong>\uff1a<\/p>\n<ol>\n<li>\u989c\u8272\u9650\u4e8e 256<\/li>\n<li>\u6709\u635f\u538b\u7f29<\/li>\n<li>\u53ef\u63a7\u5236\u538b\u7f29\u8d28\u91cf<\/li>\n<li>\u4e0d\u652f\u6301\u900f\u660e<\/li>\n<li>\u9002\u5408\u7167\u7247<\/li>\n<\/ol>\n<p><strong>PNG<\/strong>\uff1a<\/p>\n<ol>\n<li>\u6709 PNG8 \u548c truecolor PNG<\/li>\n<li>PNG8 \u7c7b\u4f3c GIF \u989c\u8272\u4e0a\u9650\u4e3a 256\uff0c\u6587\u4ef6\u5c0f\uff0c\u652f\u6301 alpha \u900f\u660e\u5ea6\uff0c\u65e0\u52a8\u753b<\/li>\n<li>\u9002\u5408\u56fe\u6807\u3001\u80cc\u666f\u3001\u6309\u94ae<\/li>\n<\/ol>\n<h3 id=\"articleHeader36\">9\u3001display,float,position \u7684\u5173\u7cfb<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<ol>\n<li>\u5982\u679c<code>display<\/code>\u4e3a none\uff0c\u90a3\u4e48 position \u548c float \u90fd\u4e0d\u8d77\u4f5c\u7528\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\u5143\u7d20\u4e0d\u4ea7\u751f\u6846<\/li>\n<li>\u5426\u5219\uff0c\u5982\u679c position \u503c\u4e3a absolute \u6216\u8005 fixed\uff0c\u6846\u5c31\u662f\u7edd\u5bf9\u5b9a\u4f4d\u7684\uff0cfloat \u7684\u8ba1\u7b97\u503c\u4e3a none\uff0cdisplay \u6839\u636e\u4e0b\u9762\u7684\u8868\u683c\u8fdb\u884c\u8c03\u6574\u3002<\/li>\n<li>\u5426\u5219\uff0c\u5982\u679c float \u4e0d\u662f none\uff0c\u6846\u662f\u6d6e\u52a8\u7684\uff0cdisplay \u6839\u636e\u4e0b\u8868\u8fdb\u884c\u8c03\u6574<\/li>\n<li>\u5426\u5219\uff0c\u5982\u679c\u5143\u7d20\u662f\u6839\u5143\u7d20\uff0cdisplay \u6839\u636e\u4e0b\u8868\u8fdb\u884c\u8c03\u6574<\/li>\n<li>\u5176\u4ed6\u60c5\u51b5\u4e0b display \u7684\u503c\u4e3a\u6307\u5b9a\u503c \u603b\u7ed3\u8d77\u6765\uff1a<strong>\u7edd\u5bf9\u5b9a\u4f4d\u3001\u6d6e\u52a8\u3001\u6839\u5143\u7d20\u90fd\u9700\u8981\u8c03\u6574display<\/strong><\/li>\n<\/ol>\n<h3 id=\"articleHeader37\">10\u3001\u5982\u4f55\u6c34\u5e73\u5c45\u4e2d\u4e00\u4e2a\u5143\u7d20<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<ul>\n<li>\u5982\u679c\u9700\u8981\u5c45\u4e2d\u7684\u5143\u7d20\u4e3a<strong>\u5e38\u89c4\u6d41\u4e2d inline \u5143\u7d20<\/strong>\uff0c\u4e3a\u7236\u5143\u7d20\u8bbe\u7f6e<code>text-align: center;<\/code>\u5373\u53ef\u5b9e\u73b0<\/li>\n<li>\u5982\u679c\u9700\u8981\u5c45\u4e2d\u7684\u5143\u7d20\u4e3a<strong>\u5e38\u89c4\u6d41\u4e2d block \u5143\u7d20<\/strong>\uff0c1\uff09\u4e3a\u5143\u7d20\u8bbe\u7f6e\u5bbd\u5ea6\uff0c2\uff09\u8bbe\u7f6e\u5de6\u53f3 margin \u4e3a auto\u30023\uff09IE6 \u4e0b\u9700\u5728\u7236\u5143\u7d20\u4e0a\u8bbe\u7f6e<code>text-align: center;<\/code>,\u518d\u7ed9\u5b50\u5143\u7d20\u6062\u590d\u9700\u8981\u7684\u503c<\/li>\n<li>\n<pre class=\"xml hljs\"><code class=\"html\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">body<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">div<\/span> <span class=\"hljs-attr\">class<\/span>=<span class=\"hljs-string\">\"content\"<\/span>&gt;<\/span>\r\n    aaaaaa aaaaaa a a a a a a a a\r\n    <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">div<\/span>&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">body<\/span>&gt;<\/span>\r\n\r\n<span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">style<\/span>&gt;<\/span><span class=\"css\">\r\n    <span class=\"hljs-selector-tag\">body<\/span> {\r\n        <span class=\"hljs-attribute\">background<\/span>: <span class=\"hljs-number\">#DDD<\/span>;\r\n        <span class=\"hljs-attribute\">text-align<\/span>: center; <span class=\"hljs-comment\">\/* 3 *\/<\/span>\r\n    }\r\n    <span class=\"hljs-selector-class\">.content<\/span> {\r\n        <span class=\"hljs-attribute\">width<\/span>: <span class=\"hljs-number\">500px<\/span>;      <span class=\"hljs-comment\">\/* 1 *\/<\/span>\r\n        <span class=\"hljs-attribute\">text-align<\/span>: left;  <span class=\"hljs-comment\">\/* 3 *\/<\/span>\r\n        <span class=\"hljs-attribute\">margin<\/span>: <span class=\"hljs-number\">0<\/span> auto;    <span class=\"hljs-comment\">\/* 2 *\/<\/span>\r\n\r\n        <span class=\"hljs-attribute\">background<\/span>: purple;\r\n    }\r\n<\/span><span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">style<\/span>&gt;<\/span><\/code><\/pre>\n<\/li>\n<li>\u5982\u679c\u9700\u8981\u5c45\u4e2d\u7684\u5143\u7d20\u4e3a<strong>\u6d6e\u52a8\u5143\u7d20<\/strong>\uff0c1\uff09\u4e3a\u5143\u7d20\u8bbe\u7f6e\u5bbd\u5ea6\uff0c2\uff09<code>position: relative;<\/code>\uff0c3\uff09\u6d6e\u52a8\u65b9\u5411\u504f\u79fb\u91cf\uff08left \u6216\u8005 right\uff09\u8bbe\u7f6e\u4e3a 50%\uff0c4\uff09\u6d6e\u52a8\u65b9\u5411\u4e0a\u7684 margin \u8bbe\u7f6e\u4e3a\u5143\u7d20\u5bbd\u5ea6\u4e00\u534a\u4e58\u4ee5-1\n<pre class=\"xml hljs\"><code class=\"html\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">body<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">div<\/span> <span class=\"hljs-attr\">class<\/span>=<span class=\"hljs-string\">\"content\"<\/span>&gt;<\/span>\r\n    aaaaaa aaaaaa a a a a a a a a\r\n    <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">div<\/span>&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">body<\/span>&gt;<\/span>\r\n\r\n<span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">style<\/span>&gt;<\/span><span class=\"css\">\r\n    <span class=\"hljs-selector-tag\">body<\/span> {\r\n        <span class=\"hljs-attribute\">background<\/span>: <span class=\"hljs-number\">#DDD<\/span>;\r\n    }\r\n    <span class=\"hljs-selector-class\">.content<\/span> {\r\n        <span class=\"hljs-attribute\">width<\/span>: <span class=\"hljs-number\">500px<\/span>;         <span class=\"hljs-comment\">\/* 1 *\/<\/span>\r\n        <span class=\"hljs-attribute\">float<\/span>: left;\r\n\r\n        <span class=\"hljs-attribute\">position<\/span>: relative;   <span class=\"hljs-comment\">\/* 2 *\/<\/span>\r\n        <span class=\"hljs-attribute\">left<\/span>: <span class=\"hljs-number\">50%<\/span>;            <span class=\"hljs-comment\">\/* 3 *\/<\/span>\r\n        <span class=\"hljs-attribute\">margin-left<\/span>: -<span class=\"hljs-number\">250px<\/span>;  <span class=\"hljs-comment\">\/* 4 *\/<\/span>\r\n\r\n        <span class=\"hljs-attribute\">background-color<\/span>: purple;\r\n    }\r\n<\/span><span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">style<\/span>&gt;<\/span><\/code><\/pre>\n<\/li>\n<li>\u5982\u679c\u9700\u8981\u5c45\u4e2d\u7684\u5143\u7d20\u4e3a<strong>\u7edd\u5bf9\u5b9a\u4f4d\u5143\u7d20<\/strong>\uff0c1\uff09\u4e3a\u5143\u7d20\u8bbe\u7f6e\u5bbd\u5ea6\uff0c2\uff09\u504f\u79fb\u91cf\u8bbe\u7f6e\u4e3a 50%\uff0c3\uff09\u504f\u79fb\u65b9\u5411\u5916\u8fb9\u8ddd\u8bbe\u7f6e\u4e3a\u5143\u7d20\u5bbd\u5ea6\u4e00\u534a\u4e58\u4ee5-1\n<pre class=\"xml hljs\"><code class=\"html\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">body<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">div<\/span> <span class=\"hljs-attr\">class<\/span>=<span class=\"hljs-string\">\"content\"<\/span>&gt;<\/span>\r\n    aaaaaa aaaaaa a a a a a a a a\r\n    <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">div<\/span>&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">body<\/span>&gt;<\/span>\r\n\r\n<span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">style<\/span>&gt;<\/span><span class=\"css\">\r\n    <span class=\"hljs-selector-tag\">body<\/span> {\r\n        <span class=\"hljs-attribute\">background<\/span>: <span class=\"hljs-number\">#DDD<\/span>;\r\n        <span class=\"hljs-attribute\">position<\/span>: relative;\r\n    }\r\n    <span class=\"hljs-selector-class\">.content<\/span> {\r\n        <span class=\"hljs-attribute\">width<\/span>: <span class=\"hljs-number\">800px<\/span>;\r\n\r\n        <span class=\"hljs-attribute\">position<\/span>: absolute;\r\n        <span class=\"hljs-attribute\">left<\/span>: <span class=\"hljs-number\">50%<\/span>;\r\n        <span class=\"hljs-attribute\">margin-left<\/span>: -<span class=\"hljs-number\">400px<\/span>;\r\n\r\n        <span class=\"hljs-attribute\">background-color<\/span>: purple;\r\n    }\r\n<\/span><span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">style<\/span>&gt;<\/span><\/code><\/pre>\n<\/li>\n<li>\u5982\u679c\u9700\u8981\u5c45\u4e2d\u7684\u5143\u7d20\u4e3a<strong>\u7edd\u5bf9\u5b9a\u4f4d\u5143\u7d20<\/strong>\uff0c1\uff09\u4e3a\u5143\u7d20\u8bbe\u7f6e\u5bbd\u5ea6\uff0c2\uff09\u8bbe\u7f6e\u5de6\u53f3\u504f\u79fb\u91cf\u90fd\u4e3a 0,3\uff09\u8bbe\u7f6e\u5de6\u53f3\u5916\u8fb9\u8ddd\u90fd\u4e3a auto\n<pre class=\"xml hljs\"><code class=\"html\"><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">body<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">div<\/span> <span class=\"hljs-attr\">class<\/span>=<span class=\"hljs-string\">\"content\"<\/span>&gt;<\/span>\r\n    aaaaaa aaaaaa a a a a a a a a\r\n    <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">div<\/span>&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">body<\/span>&gt;<\/span>\r\n\r\n<span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">style<\/span>&gt;<\/span><span class=\"css\">\r\n    <span class=\"hljs-selector-tag\">body<\/span> {\r\n        <span class=\"hljs-attribute\">background<\/span>: <span class=\"hljs-number\">#DDD<\/span>;\r\n        <span class=\"hljs-attribute\">position<\/span>: relative;\r\n    }\r\n    <span class=\"hljs-selector-class\">.content<\/span> {\r\n        <span class=\"hljs-attribute\">width<\/span>: <span class=\"hljs-number\">800px<\/span>;\r\n\r\n        <span class=\"hljs-attribute\">position<\/span>: absolute;\r\n        <span class=\"hljs-attribute\">margin<\/span>: <span class=\"hljs-number\">0<\/span> auto;\r\n        <span class=\"hljs-attribute\">left<\/span>: <span class=\"hljs-number\">0<\/span>;\r\n        <span class=\"hljs-attribute\">right<\/span>: <span class=\"hljs-number\">0<\/span>;\r\n\r\n        <span class=\"hljs-attribute\">background-color<\/span>: purple;\r\n    }\r\n<\/span><span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">style<\/span>&gt;<\/span><\/code><\/pre>\n<\/li>\n<\/ul>\n<h2 id=\"articleHeader38\">JavaScript<\/h2>\n<h3 id=\"articleHeader39\">1\u3001JS\u6709\u51e0\u79cd\u6570\u636e\u7c7b\u578b,\u5176\u4e2d\u57fa\u672c\u6570\u636e\u7c7b\u578b\u6709\u54ea\u4e9b?<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p><strong>\u4e03\u79cd\u6570\u636e\u7c7b\u578b<\/strong><\/p>\n<ul>\n<li>Boolean<\/li>\n<li>Null<\/li>\n<li>Undefined<\/li>\n<li>Number<\/li>\n<li>String<\/li>\n<li>Symbol (ECMAScript 6 \u65b0\u5b9a\u4e49)<\/li>\n<li>Object<\/li>\n<\/ul>\n<p>(ES6\u4e4b\u524d)\u5176\u4e2d5\u79cd\u4e3a\u57fa\u672c\u7c7b\u578b:<code>string<\/code>,<code>number<\/code>,<code>boolean<\/code>,<code>null<\/code>,<code>undefined<\/code>,<\/p>\n<p>ES6\u51fa\u6765\u7684<code>Symbol<\/code>\u4e5f\u662f\u539f\u59cb\u6570\u636e\u7c7b\u578b \uff0c\u8868\u793a\u72ec\u4e00\u65e0\u4e8c\u7684\u503c<\/p>\n<p><code>Object<\/code>\u4e3a\u5f15\u7528\u7c7b\u578b(\u8303\u56f4\u633a\u5927),\u4e5f\u5305\u62ec\u6570\u7ec4\u3001\u51fd\u6570,<\/p>\n<h3 id=\"articleHeader40\">2\u3001Promise \u6784\u9020\u51fd\u6570\u662f\u540c\u6b65\u6267\u884c\u8fd8\u662f\u5f02\u6b65\u6267\u884c\uff0c\u90a3\u4e48 then \u65b9\u6cd5\u5462\uff1f<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<pre class=\"hljs coffeescript\"><code>const promise = <span class=\"hljs-keyword\">new<\/span> Promise(<span class=\"hljs-function\"><span class=\"hljs-params\">(resolve, reject)<\/span> =&gt;<\/span> {\r\n  <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-number\">1<\/span>)\r\n  resolve()\r\n  <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-number\">2<\/span>)\r\n})\r\n\r\npromise.<span class=\"hljs-keyword\">then<\/span>(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\r\n  <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-number\">3<\/span>)\r\n})\r\n\r\n<span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-number\">4<\/span>)<\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\u662f\uff1a<\/p>\n<pre class=\"hljs coffeescript\"><code><span class=\"hljs-number\">1<\/span>\r\n<span class=\"hljs-number\">2<\/span>\r\n<span class=\"hljs-number\">4<\/span>\r\n<span class=\"hljs-number\">3<\/span>\r\npromise\u6784\u9020\u51fd\u6570\u662f\u540c\u6b65\u6267\u884c\u7684\uff0c<span class=\"hljs-keyword\">then<\/span>\u65b9\u6cd5\u662f\u5f02\u6b65\u6267\u884c\u7684\r\nPromise <span class=\"hljs-keyword\">new<\/span>\u7684\u65f6\u5019\u4f1a\u7acb\u5373\u6267\u884c\u91cc\u9762\u7684\u4ee3\u7801 <span class=\"hljs-keyword\">then<\/span>\u662f\u5fae\u4efb\u52a1 \u4f1a\u5728\u672c\u6b21\u4efb\u52a1\u6267\u884c\u5b8c\u7684\u65f6\u5019\u6267\u884c setTimeout\u662f\u5b8f\u4efb\u52a1 \u4f1a\u5728\u4e0b\u6b21\u4efb\u52a1\u6267\u884c\u7684\u65f6\u5019\u6267\u884c<\/code><\/pre>\n<h3 id=\"articleHeader41\">3\u3001JS\u7684\u56db\u79cd\u8bbe\u8ba1\u6a21\u5f0f<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p><strong>\u5de5\u5382\u6a21\u5f0f<\/strong><\/p>\n<p>\u7b80\u5355\u7684\u5de5\u5382\u6a21\u5f0f\u53ef\u4ee5\u7406\u89e3\u4e3a\u89e3\u51b3\u591a\u4e2a\u76f8\u4f3c\u7684\u95ee\u9898;<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">CreatePerson<\/span>(<span class=\"hljs-params\">name,age,sex<\/span>) <\/span>{\r\n    <span class=\"hljs-keyword\">var<\/span> obj = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">Object<\/span>();\r\n    obj.name = name;\r\n    obj.age = age;\r\n    obj.sex = sex;\r\n    obj.sayName = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>()<\/span>{\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-keyword\">this<\/span>.name;\r\n    }\r\n    <span class=\"hljs-keyword\">return<\/span> obj;\r\n}\r\n<span class=\"hljs-keyword\">var<\/span> p1 = <span class=\"hljs-keyword\">new<\/span> CreatePerson(<span class=\"hljs-string\">\"longen\"<\/span>,<span class=\"hljs-string\">'28'<\/span>,<span class=\"hljs-string\">'\u7537'<\/span>);\r\n<span class=\"hljs-keyword\">var<\/span> p2 = <span class=\"hljs-keyword\">new<\/span> CreatePerson(<span class=\"hljs-string\">\"tugenhua\"<\/span>,<span class=\"hljs-string\">'27'<\/span>,<span class=\"hljs-string\">'\u5973'<\/span>);\r\n<span class=\"hljs-built_in\">console<\/span>.log(p1.name); <span class=\"hljs-comment\">\/\/ longen<\/span>\r\n<span class=\"hljs-built_in\">console<\/span>.log(p1.age);  <span class=\"hljs-comment\">\/\/ 28<\/span>\r\n<span class=\"hljs-built_in\">console<\/span>.log(p1.sex);  <span class=\"hljs-comment\">\/\/ \u7537<\/span>\r\n<span class=\"hljs-built_in\">console<\/span>.log(p1.sayName()); <span class=\"hljs-comment\">\/\/ longen<\/span>\r\n\r\n<span class=\"hljs-built_in\">console<\/span>.log(p2.name);  <span class=\"hljs-comment\">\/\/ tugenhua<\/span>\r\n<span class=\"hljs-built_in\">console<\/span>.log(p2.age);   <span class=\"hljs-comment\">\/\/ 27<\/span>\r\n<span class=\"hljs-built_in\">console<\/span>.log(p2.sex);   <span class=\"hljs-comment\">\/\/ \u5973<\/span>\r\n<span class=\"hljs-built_in\">console<\/span>.log(p2.sayName()); <span class=\"hljs-comment\">\/\/ tugenhua  <\/span>\r\n<\/code><\/pre>\n<p><strong>\u5355\u4f8b\u6a21\u5f0f<\/strong><\/p>\n<p>\u53ea\u80fd\u88ab\u5b9e\u4f8b\u5316(\u6784\u9020\u51fd\u6570\u7ed9\u5b9e\u4f8b\u6dfb\u52a0\u5c5e\u6027\u4e0e\u65b9\u6cd5)\u4e00\u6b21<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-comment\">\/\/ \u5355\u4f53\u6a21\u5f0f<\/span>\r\n<span class=\"hljs-keyword\">var<\/span> Singleton = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\">name<\/span>)<\/span>{\r\n    <span class=\"hljs-keyword\">this<\/span>.name = name;\r\n};\r\nSingleton.prototype.getName = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>()<\/span>{\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-keyword\">this<\/span>.name;\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u5b9e\u4f8b\u5bf9\u8c61<\/span>\r\n<span class=\"hljs-keyword\">var<\/span> getInstance = (<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>() <\/span>{\r\n    <span class=\"hljs-keyword\">var<\/span> instance = <span class=\"hljs-literal\">null<\/span>;\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\">name<\/span>) <\/span>{\r\n        <span class=\"hljs-keyword\">if<\/span>(!instance) {<span class=\"hljs-comment\">\/\/\u76f8\u5f53\u4e8e\u4e00\u4e2a\u4e00\u6b21\u6027\u9600\u95e8,\u53ea\u80fd\u5b9e\u4f8b\u5316\u4e00\u6b21<\/span>\r\n            instance = <span class=\"hljs-keyword\">new<\/span> Singleton(name);\r\n        }\r\n        <span class=\"hljs-keyword\">return<\/span> instance;\r\n    }\r\n})();\r\n<span class=\"hljs-comment\">\/\/ \u6d4b\u8bd5\u5355\u4f53\u6a21\u5f0f\u7684\u5b9e\u4f8b,\u6240\u4ee5a===b<\/span>\r\n<span class=\"hljs-keyword\">var<\/span> a = getInstance(<span class=\"hljs-string\">\"aa\"<\/span>);\r\n<span class=\"hljs-keyword\">var<\/span> b = getInstance(<span class=\"hljs-string\">\"bb\"<\/span>);  \r\n<\/code><\/pre>\n<p><strong>\u6c99\u7bb1\u6a21\u5f0f<\/strong><\/p>\n<p>\u5c06\u4e00\u4e9b\u51fd\u6570\u653e\u5230\u81ea\u6267\u884c\u51fd\u6570\u91cc\u9762,\u4f46\u8981\u7528\u95ed\u5305\u66b4\u9732\u63a5\u53e3,\u7528\u53d8\u91cf\u63a5\u6536\u66b4\u9732\u7684\u63a5\u53e3,\u518d\u8c03\u7528\u91cc\u9762\u7684\u503c,\u5426\u5219\u65e0\u6cd5\u4f7f\u7528\u91cc\u9762\u7684\u503c<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-keyword\">let<\/span> sandboxModel=(<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>()<\/span>{\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">sayName<\/span>()<\/span>{};\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">sayAge<\/span>()<\/span>{};\r\n    <span class=\"hljs-keyword\">return<\/span>{\r\n        <span class=\"hljs-attr\">sayName<\/span>:sayName,\r\n        <span class=\"hljs-attr\">sayAge<\/span>:sayAge\r\n    }\r\n})()\r\n<\/code><\/pre>\n<p><strong>\u53d1\u5e03\u8005\u8ba2\u9605\u6a21\u5f0f<\/strong><\/p>\n<p>\u5c31\u4f8b\u5982\u5982\u6211\u4eec\u5173\u6ce8\u4e86\u67d0\u4e00\u4e2a\u516c\u4f17\u53f7,\u7136\u540e\u4ed6\u5bf9\u5e94\u7684\u6709\u65b0\u7684\u6d88\u606f\u5c31\u4f1a\u7ed9\u4f60\u63a8\u9001,<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-comment\">\/\/\u53d1\u5e03\u8005\u4e0e\u8ba2\u9605\u6a21\u5f0f<\/span>\r\n    <span class=\"hljs-keyword\">var<\/span> shoeObj = {}; <span class=\"hljs-comment\">\/\/ \u5b9a\u4e49\u53d1\u5e03\u8005<\/span>\r\n    shoeObj.list = []; <span class=\"hljs-comment\">\/\/ \u7f13\u5b58\u5217\u8868 \u5b58\u653e\u8ba2\u9605\u8005\u56de\u8c03\u51fd\u6570<\/span>\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u589e\u52a0\u8ba2\u9605\u8005<\/span>\r\n    shoeObj.listen = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\">fn<\/span>) <\/span>{\r\n        shoeObj.list.push(fn); <span class=\"hljs-comment\">\/\/ \u8ba2\u9605\u6d88\u606f\u6dfb\u52a0\u5230\u7f13\u5b58\u5217\u8868<\/span>\r\n    }\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u53d1\u5e03\u6d88\u606f<\/span>\r\n    shoeObj.trigger = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>() <\/span>{\r\n            <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">var<\/span> i = <span class=\"hljs-number\">0<\/span>, fn; fn = <span class=\"hljs-keyword\">this<\/span>.list[i++];) {\r\n                fn.apply(<span class=\"hljs-keyword\">this<\/span>, <span class=\"hljs-built_in\">arguments<\/span>);<span class=\"hljs-comment\">\/\/\u7b2c\u4e00\u4e2a\u53c2\u6570\u53ea\u662f\u6539\u53d8fn\u7684this,<\/span>\r\n            }\r\n        }\r\n     <span class=\"hljs-comment\">\/\/ \u5c0f\u7ea2\u8ba2\u9605\u5982\u4e0b\u6d88\u606f<\/span>\r\n    shoeObj.listen(<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\">color, size<\/span>) <\/span>{\r\n        <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">\"\u989c\u8272\u662f\uff1a\"<\/span> + color);\r\n        <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">\"\u5c3a\u7801\u662f\uff1a\"<\/span> + size);\r\n    });\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u5c0f\u82b1\u8ba2\u9605\u5982\u4e0b\u6d88\u606f<\/span>\r\n    shoeObj.listen(<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\">color, size<\/span>) <\/span>{\r\n        <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">\"\u518d\u6b21\u6253\u5370\u989c\u8272\u662f\uff1a\"<\/span> + color);\r\n        <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">\"\u518d\u6b21\u6253\u5370\u5c3a\u7801\u662f\uff1a\"<\/span> + size);\r\n    });\r\n    shoeObj.trigger(<span class=\"hljs-string\">\"\u7ea2\u8272\"<\/span>, <span class=\"hljs-number\">40<\/span>);\r\n    shoeObj.trigger(<span class=\"hljs-string\">\"\u9ed1\u8272\"<\/span>, <span class=\"hljs-number\">42<\/span>);  \r\n<\/code><\/pre>\n<p>\u4ee3\u7801\u5b9e\u73b0\u903b\u8f91\u662f\u7528\u6570\u7ec4\u5b58\u8d2e\u8ba2\u9605\u8005, \u53d1\u5e03\u8005\u56de\u8c03\u51fd\u6570\u91cc\u9762\u901a\u77e5\u7684\u65b9\u5f0f\u662f\u904d\u5386\u8ba2\u9605\u8005\u6570\u7ec4,\u5e76\u5c06\u53d1\u5e03\u8005\u5185\u5bb9\u4f20\u5165\u8ba2\u9605\u8005\u6570\u7ec4<\/p>\n<h3 id=\"articleHeader42\">4\u3001\u5217\u4e3e\u51fa\u96c6\u4e2d\u521b\u5efa\u5b9e\u4f8b\u7684\u65b9\u6cd5<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>1.\u5b57\u9762\u91cf<\/p>\n<pre class=\"hljs typescript\"><code><span class=\"hljs-keyword\">let<\/span> obj={<span class=\"hljs-string\">'name'<\/span>:<span class=\"hljs-string\">'\u5f20\u4e09'<\/span>}\r\n<\/code><\/pre>\n<p>2.Object\u6784\u9020\u51fd\u6570\u521b\u5efa<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-keyword\">let<\/span> Obj=<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">Object<\/span>()\r\nObj.name=<span class=\"hljs-string\">'\u5f20\u4e09'<\/span>\r\n<\/code><\/pre>\n<p>3.\u4f7f\u7528\u5de5\u5382\u6a21\u5f0f\u521b\u5efa\u5bf9\u8c61<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">createPerson<\/span>(<span class=\"hljs-params\">name<\/span>)<\/span>{\r\n <span class=\"hljs-keyword\">var<\/span> o = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">Object<\/span>();\r\n o.name = name;\r\n };\r\n <span class=\"hljs-keyword\">return<\/span> o; \r\n}\r\n<span class=\"hljs-keyword\">var<\/span> person1 = createPerson(<span class=\"hljs-string\">'\u5f20\u4e09'<\/span>);\r\n<\/code><\/pre>\n<p>4.\u4f7f\u7528\u6784\u9020\u51fd\u6570\u521b\u5efa\u5bf9\u8c61<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">Person<\/span>(<span class=\"hljs-params\">name<\/span>)<\/span>{\r\n <span class=\"hljs-keyword\">this<\/span>.name = name;\r\n}\r\n<span class=\"hljs-keyword\">var<\/span> person1 = <span class=\"hljs-keyword\">new<\/span> Person(<span class=\"hljs-string\">'\u5f20\u4e09'<\/span>);<\/code><\/pre>\n<h3 id=\"articleHeader43\">5\u3001\u7b80\u8ff0\u4e00\u4e0b\u524d\u7aef\u4e8b\u4ef6\u6d41<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>HTML\u4e2d\u4e0ejavascript\u4ea4\u4e92\u662f\u901a\u8fc7\u4e8b\u4ef6\u9a71\u52a8\u6765\u5b9e\u73b0\u7684\uff0c\u4f8b\u5982\u9f20\u6807\u70b9\u51fb\u4e8b\u4ef6onclick\u3001\u9875\u9762\u7684\u6eda\u52a8\u4e8b\u4ef6onscroll\u7b49\u7b49\uff0c\u53ef\u4ee5\u5411\u6587\u6863\u6216\u8005\u6587\u6863\u4e2d\u7684\u5143\u7d20\u6dfb\u52a0\u4e8b\u4ef6\u4fa6\u542c\u5668\u6765\u9884\u8ba2\u4e8b\u4ef6\u3002\u60f3\u8981\u77e5\u9053\u8fd9\u4e9b\u4e8b\u4ef6\u662f\u5728\u4ec0\u4e48\u65f6\u5019\u8fdb\u884c\u8c03\u7528\u7684\uff0c\u5c31\u9700\u8981\u4e86\u89e3\u4e00\u4e0b\u201c\u4e8b\u4ef6\u6d41\u201d\u7684\u6982\u5ff5\u3002<\/p>\n<p>\u4ec0\u4e48\u662f\u4e8b\u4ef6\u6d41\uff1a\u4e8b\u4ef6\u6d41\u63cf\u8ff0\u7684\u662f\u4ece\u9875\u9762\u4e2d\u63a5\u6536\u4e8b\u4ef6\u7684\u987a\u5e8f,DOM2\u7ea7\u4e8b\u4ef6\u6d41\u5305\u62ec\u4e0b\u9762\u51e0\u4e2a\u9636\u6bb5\u3002<\/p>\n<ul>\n<li>\u4e8b\u4ef6\u6355\u83b7\u9636\u6bb5<\/li>\n<li>\u5904\u4e8e\u76ee\u6807\u9636\u6bb5<\/li>\n<li>\u4e8b\u4ef6\u5192\u6ce1\u9636\u6bb5<\/li>\n<\/ul>\n<p><strong>addEventListener<\/strong>\uff1a<strong>addEventListener<\/strong>\u662fDOM2 \u7ea7\u4e8b\u4ef6\u65b0\u589e\u7684\u6307\u5b9a\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u7684\u64cd\u4f5c\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u63a5\u65363\u4e2a\u53c2\u6570\uff1a\u8981\u5904\u7406\u7684\u4e8b\u4ef6\u540d\u3001\u4f5c\u4e3a\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u7684\u51fd\u6570\u548c\u4e00\u4e2a\u5e03\u5c14\u503c\u3002\u6700\u540e\u8fd9\u4e2a\u5e03\u5c14\u503c\u53c2\u6570\u5982\u679c\u662ftrue\uff0c\u8868\u793a\u5728\u6355\u83b7\u9636\u6bb5\u8c03\u7528\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\uff1b\u5982\u679c\u662ffalse\uff0c\u8868\u793a\u5728\u5192\u6ce1\u9636\u6bb5\u8c03\u7528\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u3002<\/p>\n<p><strong>IE\u53ea\u652f\u6301\u4e8b\u4ef6\u5192\u6ce1<\/strong>\u3002<\/p>\n<h3 id=\"articleHeader44\">6\u3001<code>Function._proto_(getPrototypeOf)\u662f\u4ec0\u4e48\uff1f<\/code><\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u83b7\u53d6\u4e00\u4e2a\u5bf9\u8c61\u7684\u539f\u578b\uff0c\u5728chrome\u4e2d\u53ef\u4ee5\u901a\u8fc7__proto__\u7684\u5f62\u5f0f\uff0c\u6216\u8005\u5728ES6\u4e2d\u53ef\u4ee5\u901a\u8fc7Object.getPrototypeOf\u7684\u5f62\u5f0f\u3002<\/p>\n<p>\u90a3\u4e48Function.proto\u662f\u4ec0\u4e48\u4e48\uff1f\u4e5f\u5c31\u662f\u8bf4Function\u7531\u4ec0\u4e48\u5bf9\u8c61\u7ee7\u627f\u800c\u6765\uff0c\u6211\u4eec\u6765\u505a\u5982\u4e0b\u5224\u522b\u3002<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-built_in\">Function<\/span>.__proto__==<span class=\"hljs-built_in\">Object<\/span>.prototype <span class=\"hljs-comment\">\/\/false<\/span>\r\n<span class=\"hljs-built_in\">Function<\/span>.__proto__==<span class=\"hljs-built_in\">Function<\/span>.prototype<span class=\"hljs-comment\">\/\/true<\/span><\/code><\/pre>\n<p>\u6211\u4eec\u53d1\u73b0Function\u7684\u539f\u578b\u4e5f\u662fFunction\u3002<\/p>\n<p>\u6211\u4eec\u7528\u56fe\u53ef\u4ee5\u6765\u660e\u786e\u8fd9\u4e2a\u5173\u7cfb\uff1a<\/p>\n<p><span class=\"img-wrap\"><img decoding=\"async\" title=\"image-20190914235210887\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000020391427?w=1292&amp;h=1028\" alt=\"image-20190914235210887\" data-src=\"\/img\/remote\/1460000020391427?w=1292&amp;h=1028\" \/><\/span><\/p>\n<h3 id=\"articleHeader45\">7\u3001\u7b80\u8ff0\u4e00\u4e0b\u539f\u578b \/ \u6784\u9020\u51fd\u6570 \/ \u5b9e\u4f8b<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<ul>\n<li>\u539f\u578b<code>(prototype)<\/code>: \u4e00\u4e2a\u7b80\u5355\u7684\u5bf9\u8c61\uff0c\u7528\u4e8e\u5b9e\u73b0\u5bf9\u8c61\u7684\u00a0<strong>\u5c5e\u6027\u7ee7\u627f<\/strong>\u3002\u53ef\u4ee5\u7b80\u5355\u7684\u7406\u89e3\u6210\u5bf9\u8c61\u7684\u7239\u3002\u5728 Firefox \u548c Chrome \u4e2d\uff0c\u6bcf\u4e2a<code>JavaScript<\/code>\u5bf9\u8c61\u4e2d\u90fd\u5305\u542b\u4e00\u4e2a<code>__proto__<\/code>(\u975e\u6807\u51c6)\u7684\u5c5e\u6027\u6307\u5411\u5b83\u7239(\u8be5\u5bf9\u8c61\u7684\u539f\u578b)\uff0c\u53ef<code>obj.__proto__<\/code>\u8fdb\u884c\u8bbf\u95ee\u3002<\/li>\n<li>\u6784\u9020\u51fd\u6570: \u53ef\u4ee5\u901a\u8fc7<code>new<\/code>\u6765\u00a0<strong>\u65b0\u5efa\u4e00\u4e2a\u5bf9\u8c61<\/strong>\u7684\u51fd\u6570\u3002<\/li>\n<li>\u5b9e\u4f8b: \u901a\u8fc7\u6784\u9020\u51fd\u6570\u548c<code>new<\/code>\u521b\u5efa\u51fa\u6765\u7684\u5bf9\u8c61\uff0c\u4fbf\u662f\u5b9e\u4f8b\u3002\u00a0<strong>\u5b9e\u4f8b\u901a\u8fc7__proto__\u6307\u5411\u539f\u578b\uff0c\u901a\u8fc7constructor\u6307\u5411\u6784\u9020\u51fd\u6570<\/strong>\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u91cc\u6765\u4e3e\u4e2a\u6817\u5b50\uff0c\u4ee5<code>Object<\/code>\u4e3a\u4f8b\uff0c\u6211\u4eec\u5e38\u7528\u7684<code>Object<\/code>\u4fbf\u662f\u4e00\u4e2a\u6784\u9020\u51fd\u6570\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5b83\u6784\u5efa\u5b9e\u4f8b\u3002<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-comment\">\/\/ \u5b9e\u4f8b<\/span>\r\n<span class=\"hljs-keyword\">const<\/span> instance = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">Object<\/span>()\r\n<\/code><\/pre>\n<p>\u5219\u6b64\u65f6\uff0c\u00a0<strong>\u5b9e\u4f8b\u4e3ainstance<\/strong>,\u00a0<strong>\u6784\u9020\u51fd\u6570\u4e3aObject<\/strong>\uff0c\u6211\u4eec\u77e5\u9053\uff0c\u6784\u9020\u51fd\u6570\u62e5\u6709\u4e00\u4e2a<code>prototype<\/code>\u7684\u5c5e\u6027\u6307\u5411\u539f\u578b\uff0c\u56e0\u6b64\u539f\u578b\u4e3a:<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-comment\">\/\/ \u539f\u578b<\/span>\r\n<span class=\"hljs-keyword\">const<\/span> prototype = <span class=\"hljs-built_in\">Object<\/span>.prototype<\/code><\/pre>\n<p>\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u6765\u770b\u51fa\u4e09\u8005\u7684\u5173\u7cfb:<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\">\u5b9e\u4f8b.__proto__ === \u539f\u578b\r\n\r\n\u539f\u578b.constructor === \u6784\u9020\u51fd\u6570\r\n\r\n\u6784\u9020\u51fd\u6570.prototype === \u539f\u578b\r\n\r\n<span class=\"hljs-comment\">\/\/ \u8fd9\u6761\u7ebf\u5176\u5b9e\u662f\u662f\u57fa\u4e8e\u539f\u578b\u8fdb\u884c\u83b7\u53d6\u7684\uff0c\u53ef\u4ee5\u7406\u89e3\u6210\u4e00\u6761\u57fa\u4e8e\u539f\u578b\u7684\u6620\u5c04\u7ebf<\/span>\r\n<span class=\"hljs-comment\">\/\/ \u4f8b\u5982: <\/span>\r\n<span class=\"hljs-comment\">\/\/ const o = new Object()<\/span>\r\n<span class=\"hljs-comment\">\/\/ o.constructor === Object   --&gt; true<\/span>\r\n<span class=\"hljs-comment\">\/\/ o.__proto__ = null;<\/span>\r\n<span class=\"hljs-comment\">\/\/ o.constructor === Object   --&gt; false<\/span>\r\n\u5b9e\u4f8b.constructor === \u6784\u9020\u51fd\u6570<\/code><\/pre>\n<h3 id=\"articleHeader46\">8\u3001\u7b80\u8ff0\u4e00\u4e0bJS\u7ee7\u627f\uff0c\u5e76\u4e3e\u4f8b<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u5728 JS \u4e2d\uff0c\u7ee7\u627f\u901a\u5e38\u6307\u7684\u4fbf\u662f\u00a0<strong>\u539f\u578b\u94fe\u7ee7\u627f<\/strong>\uff0c\u4e5f\u5c31\u662f\u901a\u8fc7\u6307\u5b9a\u539f\u578b\uff0c\u5e76\u53ef\u4ee5\u901a\u8fc7\u539f\u578b\u94fe\u7ee7\u627f\u539f\u578b\u4e0a\u7684\u5c5e\u6027\u6216\u8005\u65b9\u6cd5\u3002<\/p>\n<ul>\n<li>\u6700\u4f18\u5316:\u00a0<strong>\u5723\u676f\u6a21\u5f0f<\/strong>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-keyword\">var<\/span> inherit = (<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\">c,p<\/span>)<\/span>{\r\n    <span class=\"hljs-keyword\">var<\/span> F = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>()<\/span>{};\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>(<span class=\"hljs-params\">c,p<\/span>)<\/span>{\r\n        F.prototype = p.prototype;\r\n        c.prototype = <span class=\"hljs-keyword\">new<\/span> F();\r\n        c.uber = p.prototype;\r\n        c.prototype.constructor = c;\r\n    }\r\n})();<\/code><\/pre>\n<\/li>\n<li>\u4f7f\u7528 ES6 \u7684\u8bed\u6cd5\u7cd6\u00a0<code>class \/ extends<\/code><\/li>\n<\/ul>\n<h3 id=\"articleHeader47\">9\u3001\u51fd\u6570\u67ef\u91cc\u5316<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u5728\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\uff0c\u51fd\u6570\u662f\u4e00\u7b49\u516c\u6c11\u3002\u90a3\u4e48\u51fd\u6570\u67ef\u91cc\u5316\u662f\u600e\u6837\u7684\u5462\uff1f<\/p>\n<p>\u51fd\u6570\u67ef\u91cc\u5316\u6307\u7684\u662f\u5c06\u80fd\u591f\u63a5\u6536\u591a\u4e2a\u53c2\u6570\u7684\u51fd\u6570\u8f6c\u5316\u4e3a\u63a5\u6536\u5355\u4e00\u53c2\u6570\u7684\u51fd\u6570\uff0c\u5e76\u4e14\u8fd4\u56de\u63a5\u6536\u4f59\u4e0b\u53c2\u6570\u4e14\u8fd4\u56de\u7ed3\u679c\u7684\u65b0\u51fd\u6570\u7684\u6280\u672f\u3002<\/p>\n<p>\u51fd\u6570\u67ef\u91cc\u5316\u7684\u4e3b\u8981\u4f5c\u7528\u548c\u7279\u70b9\u5c31\u662f\u53c2\u6570\u590d\u7528\u3001\u63d0\u524d\u8fd4\u56de\u548c\u5ef6\u8fdf\u6267\u884c\u3002<\/p>\n<p>\u5728\u4e00\u4e2a\u51fd\u6570\u4e2d\uff0c\u9996\u5148\u586b\u5145\u51e0\u4e2a\u53c2\u6570\uff0c\u7136\u540e\u518d\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u51fd\u6570\u7684\u6280\u672f\uff0c\u79f0\u4e3a\u51fd\u6570\u7684\u67ef\u91cc\u5316\u3002\u901a\u5e38\u53ef\u7528\u4e8e\u5728\u4e0d\u4fb5\u5165\u51fd\u6570\u7684\u524d\u63d0\u4e0b\uff0c\u4e3a\u51fd\u6570\u00a0<strong>\u9884\u7f6e\u901a\u7528\u53c2\u6570<\/strong>\uff0c\u4f9b\u591a\u6b21\u91cd\u590d\u8c03\u7528\u3002<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-keyword\">const<\/span> add = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">add<\/span>(<span class=\"hljs-params\">x<\/span>) <\/span>{\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> (<span class=\"hljs-params\">y<\/span>) <\/span>{\r\n        <span class=\"hljs-keyword\">return<\/span> x + y\r\n    }\r\n}\r\n\r\n<span class=\"hljs-keyword\">const<\/span> add1 = add(<span class=\"hljs-number\">1<\/span>)\r\n\r\nadd1(<span class=\"hljs-number\">2<\/span>) === <span class=\"hljs-number\">3<\/span>\r\nadd1(<span class=\"hljs-number\">20<\/span>) === <span class=\"hljs-number\">21<\/span>\r\n<\/code><\/pre>\n<h3 id=\"articleHeader48\">10\u3001\u8bf4\u8bf4bind\u3001call\u3001apply \u533a\u522b\uff1f<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p><code>call<\/code>\u00a0\u548c\u00a0<code>apply<\/code>\u00a0\u90fd\u662f\u4e3a\u4e86\u89e3\u51b3\u6539\u53d8\u00a0<code>this<\/code>\u00a0\u7684\u6307\u5411\u3002\u4f5c\u7528\u90fd\u662f\u76f8\u540c\u7684\uff0c\u53ea\u662f\u4f20\u53c2\u7684\u65b9\u5f0f\u4e0d\u540c\u3002<\/p>\n<p>\u9664\u4e86\u7b2c\u4e00\u4e2a\u53c2\u6570\u5916\uff0c<code>call<\/code>\u00a0\u53ef\u4ee5\u63a5\u6536\u4e00\u4e2a\u53c2\u6570\u5217\u8868\uff0c<code>apply<\/code>\u00a0\u53ea\u63a5\u53d7\u4e00\u4e2a\u53c2\u6570\u6570\u7ec4\u3002<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-keyword\">let<\/span> a = {\r\n    <span class=\"hljs-attr\">value<\/span>: <span class=\"hljs-number\">1<\/span>\r\n}\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">getValue<\/span>(<span class=\"hljs-params\">name, age<\/span>) <\/span>{\r\n    <span class=\"hljs-built_in\">console<\/span>.log(name)\r\n    <span class=\"hljs-built_in\">console<\/span>.log(age)\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-keyword\">this<\/span>.value)\r\n}\r\ngetValue.call(a, <span class=\"hljs-string\">'yck'<\/span>, <span class=\"hljs-string\">'24'<\/span>)\r\ngetValue.apply(a, [<span class=\"hljs-string\">'yck'<\/span>, <span class=\"hljs-string\">'24'<\/span>])\r\n<\/code><\/pre>\n<p><code>bind<\/code>\u548c\u5176\u4ed6\u4e24\u4e2a\u65b9\u6cd5\u4f5c\u7528\u4e5f\u662f\u4e00\u81f4\u7684\uff0c\u53ea\u662f\u8be5\u65b9\u6cd5\u4f1a\u8fd4\u56de\u4e00\u4e2a\u51fd\u6570\u3002\u5e76\u4e14\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u00a0<code>bind<\/code>\u5b9e\u73b0\u67ef\u91cc\u5316\u3002<\/p>\n<p><code>\uff08\u4e0b\u9762\u662f\u5bf9\u8fd9\u4e09\u4e2a\u65b9\u6cd5\u7684\u6269\u5c55\u4ecb\u7ecd\uff09<\/code><\/p>\n<p><strong>\u5982\u4f55\u5b9e\u73b0\u4e00\u4e2a bind \u51fd\u6570<\/strong><\/p>\n<p>\u5bf9\u4e8e\u5b9e\u73b0\u4ee5\u4e0b\u51e0\u4e2a\u51fd\u6570\uff0c\u53ef\u4ee5\u4ece\u51e0\u4e2a\u65b9\u9762\u601d\u8003<\/p>\n<ul>\n<li>\u4e0d\u4f20\u5165\u7b2c\u4e00\u4e2a\u53c2\u6570\uff0c\u90a3\u4e48\u9ed8\u8ba4\u4e3a\u00a0<code>window<\/code><\/li>\n<li>\u6539\u53d8\u4e86 this \u6307\u5411\uff0c\u8ba9\u65b0\u7684\u5bf9\u8c61\u53ef\u4ee5\u6267\u884c\u8be5\u51fd\u6570\u3002\u90a3\u4e48\u601d\u8def\u662f\u5426\u53ef\u4ee5\u53d8\u6210\u7ed9\u65b0\u7684\u5bf9\u8c61\u6dfb\u52a0\u4e00\u4e2a\u51fd\u6570\uff0c\u7136\u540e\u5728\u6267\u884c\u5b8c\u4ee5\u540e\u5220\u9664\uff1f<\/li>\n<\/ul>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-built_in\">Function<\/span>.prototype.myBind = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> (<span class=\"hljs-params\">context<\/span>) <\/span>{\r\n  <span class=\"hljs-keyword\">if<\/span> (<span class=\"hljs-keyword\">typeof<\/span> <span class=\"hljs-keyword\">this<\/span> !== <span class=\"hljs-string\">'function'<\/span>) {\r\n    <span class=\"hljs-keyword\">throw<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">TypeError<\/span>(<span class=\"hljs-string\">'Error'<\/span>)\r\n  }\r\n  <span class=\"hljs-keyword\">var<\/span> _this = <span class=\"hljs-keyword\">this<\/span>\r\n  <span class=\"hljs-keyword\">var<\/span> args = [...arguments].slice(<span class=\"hljs-number\">1<\/span>)\r\n  <span class=\"hljs-comment\">\/\/ \u8fd4\u56de\u4e00\u4e2a\u51fd\u6570<\/span>\r\n  <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">F<\/span>() <\/span>{\r\n    <span class=\"hljs-comment\">\/\/ \u56e0\u4e3a\u8fd4\u56de\u4e86\u4e00\u4e2a\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5 new F()\uff0c\u6240\u4ee5\u9700\u8981\u5224\u65ad<\/span>\r\n    <span class=\"hljs-keyword\">if<\/span> (<span class=\"hljs-keyword\">this<\/span> <span class=\"hljs-keyword\">instanceof<\/span> F) {\r\n      <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-keyword\">new<\/span> _this(...args, ...arguments)\r\n    }\r\n    <span class=\"hljs-keyword\">return<\/span> _this.apply(context, args.concat(...arguments))\r\n  }\r\n}\r\n<\/code><\/pre>\n<p><strong>\u5982\u4f55\u5b9e\u73b0\u4e00\u4e2acall\u51fd\u6570<\/strong><\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-built_in\">Function<\/span>.prototype.myCall = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> (<span class=\"hljs-params\">context<\/span>) <\/span>{\r\n  <span class=\"hljs-keyword\">var<\/span> context = context || <span class=\"hljs-built_in\">window<\/span>\r\n  <span class=\"hljs-comment\">\/\/ \u7ed9 context \u6dfb\u52a0\u4e00\u4e2a\u5c5e\u6027<\/span>\r\n  <span class=\"hljs-comment\">\/\/ getValue.call(a, 'yck', '24') =&gt; a.fn = getValue<\/span>\r\n  context.fn = <span class=\"hljs-keyword\">this<\/span>\r\n  <span class=\"hljs-comment\">\/\/ \u5c06 context \u540e\u9762\u7684\u53c2\u6570\u53d6\u51fa\u6765<\/span>\r\n  <span class=\"hljs-keyword\">var<\/span> args = [...arguments].slice(<span class=\"hljs-number\">1<\/span>)\r\n  <span class=\"hljs-comment\">\/\/ getValue.call(a, 'yck', '24') =&gt; a.fn('yck', '24')<\/span>\r\n  <span class=\"hljs-keyword\">var<\/span> result = context.fn(...args)\r\n  <span class=\"hljs-comment\">\/\/ \u5220\u9664 fn<\/span>\r\n  <span class=\"hljs-keyword\">delete<\/span> context.fn\r\n  <span class=\"hljs-keyword\">return<\/span> result\r\n}\r\n<\/code><\/pre>\n<p><strong>\u5982\u4f55\u5b9e\u73b0\u4e00\u4e2aapply\u51fd\u6570<\/strong><\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-built_in\">Function<\/span>.prototype.myApply = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> (<span class=\"hljs-params\">context<\/span>) <\/span>{\r\n  <span class=\"hljs-keyword\">var<\/span> context = context || <span class=\"hljs-built_in\">window<\/span>\r\n  context.fn = <span class=\"hljs-keyword\">this<\/span>\r\n\r\n  <span class=\"hljs-keyword\">var<\/span> result\r\n  <span class=\"hljs-comment\">\/\/ \u9700\u8981\u5224\u65ad\u662f\u5426\u5b58\u50a8\u7b2c\u4e8c\u4e2a\u53c2\u6570<\/span>\r\n  <span class=\"hljs-comment\">\/\/ \u5982\u679c\u5b58\u5728\uff0c\u5c31\u5c06\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5c55\u5f00<\/span>\r\n  <span class=\"hljs-keyword\">if<\/span> (<span class=\"hljs-built_in\">arguments<\/span>[<span class=\"hljs-number\">1<\/span>]) {\r\n    result = context.fn(...arguments[<span class=\"hljs-number\">1<\/span>])\r\n  } <span class=\"hljs-keyword\">else<\/span> {\r\n    result = context.fn()\r\n  }\r\n\r\n  <span class=\"hljs-keyword\">delete<\/span> context.fn\r\n  <span class=\"hljs-keyword\">return<\/span> result\r\n}\r\n<\/code><\/pre>\n<h3 id=\"articleHeader49\">11\u3001\u7bad\u5934\u51fd\u6570\u7684\u7279\u70b9<\/h3>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">a<\/span>() <\/span>{\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\r\n            <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-keyword\">this<\/span>)\r\n        }\r\n    }\r\n}\r\n<span class=\"hljs-built_in\">console<\/span>.log(a()()())\r\n<\/code><\/pre>\n<p>\u7bad\u5934\u51fd\u6570\u5176\u5b9e\u662f\u6ca1\u6709\u00a0<code>this<\/code>\u7684\uff0c\u8fd9\u4e2a\u51fd\u6570\u4e2d\u7684\u00a0<code>this<\/code>\u53ea\u53d6\u51b3\u4e8e\u4ed6\u5916\u9762\u7684\u7b2c\u4e00\u4e2a\u4e0d\u662f\u7bad\u5934\u51fd\u6570\u7684\u51fd\u6570\u7684\u00a0<code>this<\/code>\u3002\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u56e0\u4e3a\u8c03\u7528\u00a0<code>a<\/code>\u7b26\u5408\u524d\u9762\u4ee3\u7801\u4e2d\u7684\u7b2c\u4e00\u4e2a\u60c5\u51b5\uff0c\u6240\u4ee5\u00a0<code>this<\/code>\u662f\u00a0<code>window<\/code>\u3002\u5e76\u4e14\u00a0<code>this<\/code>\u4e00\u65e6\u7ed1\u5b9a\u4e86\u4e0a\u4e0b\u6587\uff0c\u5c31\u4e0d\u4f1a\u88ab\u4efb\u4f55\u4ee3\u7801\u6539\u53d8\u3002<\/p>\n<h2 id=\"articleHeader50\">\u7a0b\u5e8f\u9605\u8bfb\u9898<\/h2>\n<h3 id=\"articleHeader51\">1\u3001\u4e0b\u9762\u7a0b\u5e8f\u8f93\u51fa\u7684\u7ed3\u679c\u662f\u4ec0\u4e48\uff1f<\/h3>\n<pre class=\"hljs javascript\"><code><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">sayHi<\/span>() <\/span>{\r\n  <span class=\"hljs-built_in\">console<\/span>.log(name);\r\n  <span class=\"hljs-built_in\">console<\/span>.log(age);\r\n  <span class=\"hljs-keyword\">var<\/span> name = <span class=\"hljs-string\">\"Lydia\"<\/span>;\r\n  <span class=\"hljs-keyword\">let<\/span> age = <span class=\"hljs-number\">21<\/span>;\r\n}\r\n\r\nsayHi();<\/code><\/pre>\n<ul>\n<li>A:\u00a0<code>Lydia<\/code>\u00a0\u548c\u00a0<code>undefined<\/code><\/li>\n<li>B:\u00a0<code>Lydia<\/code>\u00a0\u548c\u00a0<code>ReferenceError<\/code><\/li>\n<li>C:\u00a0<code>ReferenceError<\/code>\u00a0\u548c\u00a0<code>21<\/code><\/li>\n<li>D:\u00a0<code>undefined<\/code>\u00a0\u548c\u00a0<code>ReferenceError<\/code><\/li>\n<\/ul>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u5728\u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u4f7f\u7528<code>var<\/code>\u5173\u952e\u5b57\u58f0\u660e\u4e86<code>name<\/code>\u53d8\u91cf\u3002 \u8fd9\u610f\u5473\u7740\u53d8\u91cf\u5728\u521b\u5efa\u9636\u6bb5\u4f1a\u88ab\u63d0\u5347\uff08<code>JavaScript<\/code>\u4f1a\u5728\u521b\u5efa\u53d8\u91cf\u521b\u5efa\u9636\u6bb5\u4e3a\u5176\u5206\u914d\u5185\u5b58\u7a7a\u95f4\uff09\uff0c\u9ed8\u8ba4\u503c\u4e3a<code>undefined<\/code>\uff0c\u76f4\u5230\u6211\u4eec\u5b9e\u9645\u6267\u884c\u5230\u4f7f\u7528\u8be5\u53d8\u91cf\u7684\u884c\u3002 \u6211\u4eec\u8fd8\u6ca1\u6709\u4e3a<code>name<\/code>\u53d8\u91cf\u8d4b\u503c\uff0c\u6240\u4ee5\u5b83\u4ecd\u7136\u4fdd\u6301<code>undefined<\/code>\u7684\u503c\u3002<\/p>\n<p>\u4f7f\u7528<code>let<\/code>\u5173\u952e\u5b57\uff08\u548c<code>const<\/code>\uff09\u58f0\u660e\u7684\u53d8\u91cf\u4e5f\u4f1a\u5b58\u5728\u53d8\u91cf\u63d0\u5347\uff0c\u4f46\u4e0e<code>var<\/code>\u4e0d\u540c\uff0c\u521d\u59cb\u5316\u6ca1\u6709\u88ab\u63d0\u5347\u3002 \u5728\u6211\u4eec\u58f0\u660e\uff08\u521d\u59cb\u5316\uff09\u5b83\u4eec\u4e4b\u524d\uff0c\u5b83\u4eec\u662f\u4e0d\u53ef\u8bbf\u95ee\u7684\u3002 \u8fd9\u88ab\u79f0\u4e3a\u201c\u6682\u65f6\u6b7b\u533a\u201d\u3002 \u5f53\u6211\u4eec\u5728\u58f0\u660e\u53d8\u91cf\u4e4b\u524d\u5c1d\u8bd5\u8bbf\u95ee\u53d8\u91cf\u65f6\uff0c<code>JavaScript<\/code>\u4f1a\u629b\u51fa\u4e00\u4e2a<code>ReferenceError<\/code>\u3002<\/p>\n<p>\u5173\u4e8e<code>let<\/code>\u7684\u662f\u5426\u5b58\u5728\u53d8\u91cf\u63d0\u5347\uff0c\u6211\u4eec\u4f55\u4ee5\u7528\u4e0b\u9762\u7684\u4f8b\u5b50\u6765\u9a8c\u8bc1\uff1a<\/p>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-keyword\">let<\/span> name = <span class=\"hljs-string\">'ConardLi'<\/span>\r\n{\r\n  <span class=\"hljs-built_in\">console<\/span>.log(name) <span class=\"hljs-comment\">\/\/ Uncaught ReferenceError: name is not defined<\/span>\r\n  <span class=\"hljs-keyword\">let<\/span> name = <span class=\"hljs-string\">'code\u79d8\u5bc6\u82b1\u56ed'<\/span>\r\n}\r\n<\/code><\/pre>\n<p><code>let<\/code>\u53d8\u91cf\u5982\u679c\u4e0d\u5b58\u5728\u53d8\u91cf\u63d0\u5347\uff0c<code>console.log(name)<\/code>\u5c31\u4f1a\u8f93\u51fa<code>ConardLi<\/code>\uff0c\u7ed3\u679c\u5374\u629b\u51fa\u4e86<code>ReferenceError<\/code>\uff0c\u90a3\u4e48\u8fd9\u5f88\u597d\u7684\u8bf4\u660e\u4e86\uff0c<code>let<\/code>\u4e5f\u5b58\u5728\u53d8\u91cf\u63d0\u5347\uff0c\u4f46\u662f\u5b83\u5b58\u5728\u4e00\u4e2a\u201c\u6682\u65f6\u6b7b\u533a\u201d\uff0c\u5728\u53d8\u91cf\u672a\u521d\u59cb\u5316\u6216\u8d4b\u503c\u524d\u4e0d\u5141\u8bb8\u8bbf\u95ee\u3002<\/p>\n<p>\u53d8\u91cf\u7684\u8d4b\u503c\u53ef\u4ee5\u5206\u4e3a\u4e09\u4e2a\u9636\u6bb5\uff1a<\/p>\n<ul>\n<li>\u521b\u5efa\u53d8\u91cf\uff0c\u5728\u5185\u5b58\u4e2d\u5f00\u8f9f\u7a7a\u95f4<\/li>\n<li>\u521d\u59cb\u5316\u53d8\u91cf\uff0c\u5c06\u53d8\u91cf\u521d\u59cb\u5316\u4e3a<code>undefined<\/code><\/li>\n<li>\u771f\u6b63\u8d4b\u503c<\/li>\n<\/ul>\n<p>\u5173\u4e8e<code>let<\/code>\u3001<code>var<\/code>\u548c<code>function<\/code>\uff1a<\/p>\n<ul>\n<li><code>let<\/code>\u7684\u300c\u521b\u5efa\u300d\u8fc7\u7a0b\u88ab\u63d0\u5347\u4e86\uff0c\u4f46\u662f\u521d\u59cb\u5316\u6ca1\u6709\u63d0\u5347\u3002<\/li>\n<li><code>var<\/code>\u7684\u300c\u521b\u5efa\u300d\u548c\u300c\u521d\u59cb\u5316\u300d\u90fd\u88ab\u63d0\u5347\u4e86\u3002<\/li>\n<li><code>function<\/code>\u7684\u300c\u521b\u5efa\u300d\u300c\u521d\u59cb\u5316\u300d\u548c\u300c\u8d4b\u503c\u300d\u90fd\u88ab\u63d0\u5347\u4e86\u3002<\/li>\n<\/ul>\n<h3 id=\"articleHeader52\">2\u3001\u4e0b\u9762\u4ee3\u7801\u8f93\u51fa\u4ec0\u4e48<\/h3>\n<pre class=\"hljs lisp\"><code>var a = <span class=\"hljs-number\">10<\/span><span class=\"hljs-comment\">;<\/span>\r\n(<span class=\"hljs-name\">function<\/span> () {\r\n    console.log(<span class=\"hljs-name\">a<\/span>)\r\n    a = <span class=\"hljs-number\">5<\/span>\r\n    console.log(<span class=\"hljs-name\">window<\/span>.a)\r\n    var a = <span class=\"hljs-number\">20<\/span><span class=\"hljs-comment\">;<\/span>\r\n    console.log(<span class=\"hljs-name\">a<\/span>)\r\n})()<\/code><\/pre>\n<p>\u4f9d\u6b21\u8f93\u51fa\uff1aundefined -&gt; 10 -&gt; 20<\/p>\n<pre class=\"hljs typescript\"><code>\u5728\u7acb\u5373\u6267\u884c\u51fd\u6570\u4e2d\uff0c<span class=\"hljs-keyword\">var<\/span> a = <span class=\"hljs-number\">20<\/span>; \u8bed\u53e5\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf a\uff0c\u7531\u4e8ejs\u7684\u53d8\u91cf\u58f0\u660e\u63d0\u5347\u673a\u5236\uff0c\u5c40\u90e8\u53d8\u91cfa\u7684\u58f0\u660e\u4f1a\u88ab\u63d0\u5347\u81f3\u7acb\u5373\u6267\u884c\u51fd\u6570\u7684\u51fd\u6570\u4f53\u6700\u4e0a\u65b9\uff0c\u4e14\u7531\u4e8e\u8fd9\u6837\u7684\u63d0\u5347\u5e76\u4e0d\u5305\u62ec\u8d4b\u503c\uff0c\u56e0\u6b64\u7b2c\u4e00\u6761\u6253\u5370\u8bed\u53e5\u4f1a\u6253\u5370<span class=\"hljs-literal\">undefined<\/span>\uff0c\u6700\u540e\u4e00\u6761\u8bed\u53e5\u4f1a\u6253\u5370<span class=\"hljs-number\">20<\/span>\u3002\r\n\r\n\u7531\u4e8e\u53d8\u91cf\u58f0\u660e\u63d0\u5347\uff0ca = <span class=\"hljs-number\">5<\/span>; \u8fd9\u6761\u8bed\u53e5\u6267\u884c\u65f6\uff0c\u5c40\u90e8\u7684\u53d8\u91cfa\u5df2\u7ecf\u58f0\u660e\uff0c\u56e0\u6b64\u5b83\u4ea7\u751f\u7684\u6548\u679c\u662f\u5bf9\u5c40\u90e8\u7684\u53d8\u91cfa\u8d4b\u503c\uff0c\u6b64\u65f6<span class=\"hljs-built_in\">window<\/span>.a \u4f9d\u65e7\u662f\u6700\u5f00\u59cb\u8d4b\u503c\u7684<span class=\"hljs-number\">10<\/span>\uff0c<\/code><\/pre>\n<h3 id=\"articleHeader53\">3\u3001\u4e0b\u9762\u7684\u8f93\u51fa\u7ed3\u679c\u662f\u4ec0\u4e48\uff1f<\/h3>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-class\"><span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Chameleon<\/span> <\/span>{\r\n  <span class=\"hljs-keyword\">static<\/span> colorChange(newColor) {\r\n    <span class=\"hljs-keyword\">this<\/span>.newColor = newColor;\r\n  }\r\n\r\n  <span class=\"hljs-keyword\">constructor<\/span>({ newColor = <span class=\"hljs-string\">\"green\"<\/span> } = {}) {\r\n    <span class=\"hljs-keyword\">this<\/span>.newColor = newColor;\r\n  }\r\n}\r\n\r\n<span class=\"hljs-keyword\">const<\/span> freddie = <span class=\"hljs-keyword\">new<\/span> Chameleon({ <span class=\"hljs-attr\">newColor<\/span>: <span class=\"hljs-string\">\"purple\"<\/span> });\r\nfreddie.colorChange(<span class=\"hljs-string\">\"orange\"<\/span>);\r\n<\/code><\/pre>\n<ul>\n<li>A:\u00a0<code>orange<\/code><\/li>\n<li>B:\u00a0<code>purple<\/code><\/li>\n<li>C:\u00a0<code>green<\/code><\/li>\n<li>D:\u00a0<code>TypeError<\/code><\/li>\n<\/ul>\n<p>\u7b54\u6848: D<\/p>\n<p><code>colorChange<\/code>\u65b9\u6cd5\u662f\u9759\u6001\u7684\u3002 \u9759\u6001\u65b9\u6cd5\u4ec5\u5728\u521b\u5efa\u5b83\u4eec\u7684\u6784\u9020\u51fd\u6570\u4e2d\u5b58\u5728\uff0c\u5e76\u4e14\u4e0d\u80fd\u4f20\u9012\u7ed9\u4efb\u4f55\u5b50\u7ea7\u3002 \u7531\u4e8e<code>freddie<\/code>\u662f\u4e00\u4e2a\u5b50\u7ea7\u5bf9\u8c61\uff0c\u51fd\u6570\u4e0d\u4f1a\u4f20\u9012\uff0c\u6240\u4ee5\u5728<code>freddie<\/code>\u5b9e\u4f8b\u4e0a\u4e0d\u5b58\u5728<code>freddie<\/code>\u65b9\u6cd5\uff1a\u629b\u51fa<code>TypeError<\/code>\u3002<\/p>\n<h3 id=\"articleHeader54\">4\u3001\u4e0b\u9762\u4ee3\u7801\u4e2d\u4ec0\u4e48\u65f6\u5019\u4f1a\u8f93\u51fa1\uff1f<\/h3>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-keyword\">var<\/span> a = ?;\r\n<span class=\"hljs-keyword\">if<\/span>(a == <span class=\"hljs-number\">1<\/span> &amp;&amp; a == <span class=\"hljs-number\">2<\/span> &amp;&amp; a == <span class=\"hljs-number\">3<\/span>){\r\n     conso.log(<span class=\"hljs-number\">1<\/span>);\r\n}<\/code><\/pre>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<blockquote><p>\u56e0\u4e3a==\u4f1a\u8fdb\u884c\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362 \u6240\u4ee5\u6211\u4eec\u91cd\u5199toString\u65b9\u6cd5\u5c31\u53ef\u4ee5\u4e86<\/p><\/blockquote>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-keyword\">var<\/span> a = {\r\n  <span class=\"hljs-attr\">i<\/span>: <span class=\"hljs-number\">1<\/span>,\r\n  toString() {\r\n    <span class=\"hljs-keyword\">return<\/span> a.i++;\r\n  }\r\n}\r\n\r\n<span class=\"hljs-keyword\">if<\/span>( a == <span class=\"hljs-number\">1<\/span> &amp;&amp; a == <span class=\"hljs-number\">2<\/span> &amp;&amp; a == <span class=\"hljs-number\">3<\/span> ) {\r\n  <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-number\">1<\/span>);\r\n}<\/code><\/pre>\n<h4>5\u3001\u4e0b\u9762\u7684\u8f93\u51fa\u7ed3\u679c\u662f\u4ec0\u4e48\uff1f<\/h4>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-keyword\">var<\/span> obj = {\r\n    <span class=\"hljs-string\">'2'<\/span>: <span class=\"hljs-number\">3<\/span>,\r\n    <span class=\"hljs-string\">'3'<\/span>: <span class=\"hljs-number\">4<\/span>,\r\n    <span class=\"hljs-string\">'length'<\/span>: <span class=\"hljs-number\">2<\/span>,\r\n    <span class=\"hljs-string\">'splice'<\/span>: <span class=\"hljs-built_in\">Array<\/span>.prototype.splice,\r\n    <span class=\"hljs-string\">'push'<\/span>: <span class=\"hljs-built_in\">Array<\/span>.prototype.push\r\n}\r\nobj.push(<span class=\"hljs-number\">1<\/span>)\r\nobj.push(<span class=\"hljs-number\">2<\/span>)\r\n<span class=\"hljs-built_in\">console<\/span>.log(obj)<\/code><\/pre>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>1.\u4f7f\u7528\u7b2c\u4e00\u6b21push\uff0cobj\u5bf9\u8c61\u7684push\u65b9\u6cd5\u8bbe\u7f6e\u00a0<code>obj[2]=1;obj.length+=1<\/code><br \/>\n2.\u4f7f\u7528\u7b2c\u4e8c\u6b21push\uff0cobj\u5bf9\u8c61\u7684push\u65b9\u6cd5\u8bbe\u7f6e\u00a0<code>obj[3]=2;obj.length+=1<\/code><br \/>\n3.\u4f7f\u7528console.log\u8f93\u51fa\u7684\u65f6\u5019\uff0c\u56e0\u4e3aobj\u5177\u6709 length \u5c5e\u6027\u548c splice \u65b9\u6cd5\uff0c\u6545\u5c06\u5176\u4f5c\u4e3a\u6570\u7ec4\u8fdb\u884c\u6253\u5370<br \/>\n4.\u6253\u5370\u65f6\u56e0\u4e3a\u6570\u7ec4\u672a\u8bbe\u7f6e\u4e0b\u6807\u4e3a 0 1 \u5904\u7684\u503c\uff0c\u6545\u6253\u5370\u4e3aempty\uff0c\u4e3b\u52a8 obj[0] \u83b7\u53d6\u4e3a undefined<\/p>\n<p><span class=\"img-wrap\"><img decoding=\"async\" title=\"\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000020391428?w=996&amp;h=530\" alt=\"\" data-src=\"\/img\/remote\/1460000020391428?w=996&amp;h=530\" \/><\/span><\/p>\n<h3 id=\"articleHeader55\">6\u3001\u4e0b\u9762\u4ee3\u7801\u8f93\u51fa\u7684\u7ed3\u679c\u662f\u4ec0\u4e48\uff1f<\/h3>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-keyword\">var<\/span> a = {<span class=\"hljs-attr\">n<\/span>: <span class=\"hljs-number\">1<\/span>};\r\n<span class=\"hljs-keyword\">var<\/span> b = a;\r\na.x = a = {<span class=\"hljs-attr\">n<\/span>: <span class=\"hljs-number\">2<\/span>};\r\n\r\n<span class=\"hljs-built_in\">console<\/span>.log(a.x)     \r\n<span class=\"hljs-built_in\">console<\/span>.log(b.x)<\/code><\/pre>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>undefined<br \/>\n{n:2}<\/p>\n<p>\u9996\u5148\uff0ca\u548cb\u540c\u65f6\u5f15\u7528\u4e86{n:2}\u5bf9\u8c61\uff0c\u63a5\u7740\u6267\u884c\u5230a.x = a = {n\uff1a2}\u8bed\u53e5\uff0c\u5c3d\u7ba1\u8d4b\u503c\u662f\u4ece\u53f3\u5230\u5de6\u7684\u6ca1\u9519\uff0c\u4f46\u662f.\u7684\u4f18\u5148\u7ea7\u6bd4=\u8981\u9ad8\uff0c\u6240\u4ee5\u8fd9\u91cc\u9996\u5148\u6267\u884ca.x\uff0c\u76f8\u5f53\u4e8e\u4e3aa\uff08\u6216\u8005b\uff09\u6240\u6307\u5411\u7684{n:1}\u5bf9\u8c61\u65b0\u589e\u4e86\u4e00\u4e2a\u5c5e\u6027x\uff0c\u5373\u6b64\u65f6\u5bf9\u8c61\u5c06\u53d8\u4e3a{n:1;x:undefined}\u3002\u4e4b\u540e\u6309\u6b63\u5e38\u60c5\u51b5\uff0c\u4ece\u53f3\u5230\u5de6\u8fdb\u884c\u8d4b\u503c\uff0c\u6b64\u65f6\u6267\u884ca ={n:2}\u7684\u65f6\u5019\uff0ca\u7684\u5f15\u7528\u6539\u53d8\uff0c\u6307\u5411\u4e86\u65b0\u5bf9\u8c61{n\uff1a2},\u800cb\u4f9d\u7136\u6307\u5411\u7684\u662f\u65e7\u5bf9\u8c61\u3002\u4e4b\u540e\u6267\u884ca.x = {n\uff1a2}\u7684\u65f6\u5019\uff0c\u5e76\u4e0d\u4f1a\u91cd\u65b0\u89e3\u6790\u4e00\u904da\uff0c\u800c\u662f\u6cbf\u7528\u6700\u521d\u89e3\u6790a.x\u65f6\u5019\u7684a\uff0c\u4e5f\u5373\u65e7\u5bf9\u8c61\uff0c\u6545\u6b64\u65f6\u65e7\u5bf9\u8c61\u7684x\u7684\u503c\u4e3a{n\uff1a2}\uff0c\u65e7\u5bf9\u8c61\u4e3a {n:1;x:{n\uff1a2}}\uff0c\u5b83\u88abb\u5f15\u7528\u7740\u3002<br \/>\n\u540e\u9762\u8f93\u51faa.x\u7684\u65f6\u5019\uff0c\u53c8\u8981\u89e3\u6790a\u4e86\uff0c\u6b64\u65f6\u7684a\u662f\u6307\u5411\u65b0\u5bf9\u8c61\u7684a\uff0c\u800c\u8fd9\u4e2a\u65b0\u5bf9\u8c61\u662f\u6ca1\u6709x\u5c5e\u6027\u7684\uff0c\u6545\u8bbf\u95ee\u65f6\u8f93\u51faundefined\uff1b\u800c\u8bbf\u95eeb.x\u7684\u65f6\u5019\uff0c\u5c06\u8f93\u51fa\u65e7\u5bf9\u8c61\u7684x\u7684\u503c\uff0c\u5373{n:2}\u3002<\/p>\n<h3 id=\"articleHeader56\">7\u3001\u4e0b\u9762\u4ee3\u7801\u7684\u8f93\u51fa\u662f\u4ec0\u4e48?<\/h3>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">checkAge<\/span>(<span class=\"hljs-params\">data<\/span>) <\/span>{\r\n  <span class=\"hljs-keyword\">if<\/span> (data === { <span class=\"hljs-attr\">age<\/span>: <span class=\"hljs-number\">18<\/span> }) {\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">\"You are an adult!\"<\/span>);\r\n  } <span class=\"hljs-keyword\">else<\/span> <span class=\"hljs-keyword\">if<\/span> (data == { <span class=\"hljs-attr\">age<\/span>: <span class=\"hljs-number\">18<\/span> }) {\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">\"You are still an adult.\"<\/span>);\r\n  } <span class=\"hljs-keyword\">else<\/span> {\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">`Hmm.. You don't have an age I guess`<\/span>);\r\n  }\r\n}\r\n\r\ncheckAge({ <span class=\"hljs-attr\">age<\/span>: <span class=\"hljs-number\">18<\/span> });\r\n<\/code><\/pre>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<blockquote><p>Hmm.. You don&#8217;t have an age I guess<\/p><\/blockquote>\n<p>\u5728\u6bd4\u8f83\u76f8\u7b49\u6027\uff0c\u539f\u59cb\u7c7b\u578b\u901a\u8fc7\u5b83\u4eec\u7684\u503c\u8fdb\u884c\u6bd4\u8f83\uff0c\u800c\u5bf9\u8c61\u901a\u8fc7\u5b83\u4eec\u7684\u5f15\u7528\u8fdb\u884c\u6bd4\u8f83\u3002<code>JavaScript<\/code>\u68c0\u67e5\u5bf9\u8c61\u662f\u5426\u5177\u6709\u5bf9\u5185\u5b58\u4e2d\u76f8\u540c\u4f4d\u7f6e\u7684\u5f15\u7528\u3002<\/p>\n<p>\u6211\u4eec\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7684\u5bf9\u8c61\u548c\u6211\u4eec\u7528\u4e8e\u68c0\u67e5\u76f8\u7b49\u6027\u7684\u5bf9\u8c61\u5728\u5185\u5b58\u4e2d\u4f4d\u4e8e\u4e0d\u540c\u4f4d\u7f6e\uff0c\u6240\u4ee5\u5b83\u4eec\u7684\u5f15\u7528\u662f\u4e0d\u540c\u7684\u3002<\/p>\n<p>\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48<code>{ age: 18 } === { age: 18 }<\/code>\u548c\u00a0<code>{ age: 18 } == { age: 18 }<\/code>\u8fd4\u56de\u00a0<code>false<\/code>\u7684\u539f\u56e0\u3002<\/p>\n<h3 id=\"articleHeader57\">8\u3001\u4e0b\u9762\u4ee3\u7801\u7684\u8f93\u51fa\u662f\u4ec0\u4e48?<\/h3>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-keyword\">const<\/span> obj = { <span class=\"hljs-number\">1<\/span>: <span class=\"hljs-string\">\"a\"<\/span>, <span class=\"hljs-number\">2<\/span>: <span class=\"hljs-string\">\"b\"<\/span>, <span class=\"hljs-number\">3<\/span>: <span class=\"hljs-string\">\"c\"<\/span> };\r\n<span class=\"hljs-keyword\">const<\/span> set = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">Set<\/span>([<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">5<\/span>]);\r\n\r\nobj.hasOwnProperty(<span class=\"hljs-string\">\"1\"<\/span>);\r\nobj.hasOwnProperty(<span class=\"hljs-number\">1<\/span>);\r\nset.has(<span class=\"hljs-string\">\"1\"<\/span>);\r\nset.has(<span class=\"hljs-number\">1<\/span>);\r\n<\/code><\/pre>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<blockquote><p><code>true<\/code>\u00a0<code>true<\/code>\u00a0<code>false<\/code>\u00a0<code>true<\/code><\/p><\/blockquote>\n<p>\u6240\u6709\u5bf9\u8c61\u952e\uff08\u4e0d\u5305\u62ec<code>Symbols<\/code>\uff09\u90fd\u4f1a\u88ab\u5b58\u50a8\u4e3a\u5b57\u7b26\u4e32\uff0c\u5373\u4f7f\u4f60\u6ca1\u6709\u7ed9\u5b9a\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\u952e\u3002 \u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48<code>obj.hasOwnProperty\uff08'1'\uff09<\/code>\u4e5f\u8fd4\u56de<code>true<\/code>\u3002<\/p>\n<p>\u4e0a\u9762\u7684\u8bf4\u6cd5\u4e0d\u9002\u7528\u4e8e<code>Set<\/code>\u3002 \u5728\u6211\u4eec\u7684<code>Set<\/code>\u4e2d\u6ca1\u6709<code>\u201c1\u201d<\/code>\uff1a<code>set.has\uff08'1'\uff09<\/code>\u8fd4\u56de<code>false<\/code>\u3002 \u5b83\u6709\u6570\u5b57\u7c7b\u578b<code>1<\/code>\uff0c<code>set.has\uff081\uff09<\/code>\u8fd4\u56de<code>true<\/code>\u3002<\/p>\n<h3 id=\"articleHeader58\">9\u3001\u4e0b\u9762\u4ee3\u7801\u7684\u8f93\u51fa\u662f\u4ec0\u4e48?<\/h3>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-comment\">\/\/ example 1<\/span>\r\n<span class=\"hljs-keyword\">var<\/span> a={}, b=<span class=\"hljs-string\">'123'<\/span>, c=<span class=\"hljs-number\">123<\/span>;  \r\na[b]=<span class=\"hljs-string\">'b'<\/span>;\r\na[c]=<span class=\"hljs-string\">'c'<\/span>;  \r\n<span class=\"hljs-built_in\">console<\/span>.log(a[b]);\r\n\r\n---------------------\r\n<span class=\"hljs-comment\">\/\/ example 2<\/span>\r\n<span class=\"hljs-keyword\">var<\/span> a={}, b=<span class=\"hljs-built_in\">Symbol<\/span>(<span class=\"hljs-string\">'123'<\/span>), c=<span class=\"hljs-built_in\">Symbol<\/span>(<span class=\"hljs-string\">'123'<\/span>);  \r\na[b]=<span class=\"hljs-string\">'b'<\/span>;\r\na[c]=<span class=\"hljs-string\">'c'<\/span>;  \r\n<span class=\"hljs-built_in\">console<\/span>.log(a[b]);\r\n\r\n---------------------\r\n<span class=\"hljs-comment\">\/\/ example 3<\/span>\r\n<span class=\"hljs-keyword\">var<\/span> a={}, b={<span class=\"hljs-attr\">key<\/span>:<span class=\"hljs-string\">'123'<\/span>}, c={<span class=\"hljs-attr\">key<\/span>:<span class=\"hljs-string\">'456'<\/span>};  \r\na[b]=<span class=\"hljs-string\">'b'<\/span>;\r\na[c]=<span class=\"hljs-string\">'c'<\/span>;  \r\n<span class=\"hljs-built_in\">console<\/span>.log(a[b]);\r\n<\/code><\/pre>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<p>\u8fd9\u9898\u8003\u5bdf\u7684\u662f\u5bf9\u8c61\u7684\u952e\u540d\u7684\u8f6c\u6362\u3002<\/p>\n<ul>\n<li>\u5bf9\u8c61\u7684\u952e\u540d\u53ea\u80fd\u662f\u5b57\u7b26\u4e32\u548c Symbol \u7c7b\u578b\u3002<\/li>\n<li>\u5176\u4ed6\u7c7b\u578b\u7684\u952e\u540d\u4f1a\u88ab\u8f6c\u6362\u6210\u5b57\u7b26\u4e32\u7c7b\u578b\u3002<\/li>\n<li>\u5bf9\u8c61\u8f6c\u5b57\u7b26\u4e32\u9ed8\u8ba4\u4f1a\u8c03\u7528 toString \u65b9\u6cd5\u3002<\/li>\n<\/ul>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-comment\">\/\/ example 1<\/span>\r\n<span class=\"hljs-keyword\">var<\/span> a={}, b=<span class=\"hljs-string\">'123'<\/span>, c=<span class=\"hljs-number\">123<\/span>;\r\na[b]=<span class=\"hljs-string\">'b'<\/span>;\r\n<span class=\"hljs-comment\">\/\/ c \u7684\u952e\u540d\u4f1a\u88ab\u8f6c\u6362\u6210\u5b57\u7b26\u4e32'123'\uff0c\u8fd9\u91cc\u4f1a\u628a b \u8986\u76d6\u6389\u3002<\/span>\r\na[c]=<span class=\"hljs-string\">'c'<\/span>;  \r\n<span class=\"hljs-comment\">\/\/ \u8f93\u51fa c<\/span>\r\n<span class=\"hljs-built_in\">console<\/span>.log(a[b]);\r\n\r\n\r\n<span class=\"hljs-comment\">\/\/ example 2<\/span>\r\n<span class=\"hljs-keyword\">var<\/span> a={}, b=<span class=\"hljs-built_in\">Symbol<\/span>(<span class=\"hljs-string\">'123'<\/span>), c=<span class=\"hljs-built_in\">Symbol<\/span>(<span class=\"hljs-string\">'123'<\/span>);  \r\n<span class=\"hljs-comment\">\/\/ b \u662f Symbol \u7c7b\u578b\uff0c\u4e0d\u9700\u8981\u8f6c\u6362\u3002<\/span>\r\na[b]=<span class=\"hljs-string\">'b'<\/span>;\r\n<span class=\"hljs-comment\">\/\/ c \u662f Symbol \u7c7b\u578b\uff0c\u4e0d\u9700\u8981\u8f6c\u6362\u3002\u4efb\u4f55\u4e00\u4e2a Symbol \u7c7b\u578b\u7684\u503c\u90fd\u662f\u4e0d\u76f8\u7b49\u7684\uff0c\u6240\u4ee5\u4e0d\u4f1a\u8986\u76d6\u6389 b\u3002<\/span>\r\na[c]=<span class=\"hljs-string\">'c'<\/span>;\r\n<span class=\"hljs-comment\">\/\/ \u8f93\u51fa b<\/span>\r\n<span class=\"hljs-built_in\">console<\/span>.log(a[b]);\r\n\r\n\r\n<span class=\"hljs-comment\">\/\/ example 3<\/span>\r\n<span class=\"hljs-keyword\">var<\/span> a={}, b={<span class=\"hljs-attr\">key<\/span>:<span class=\"hljs-string\">'123'<\/span>}, c={<span class=\"hljs-attr\">key<\/span>:<span class=\"hljs-string\">'456'<\/span>};  \r\n<span class=\"hljs-comment\">\/\/ b \u4e0d\u662f\u5b57\u7b26\u4e32\u4e5f\u4e0d\u662f Symbol \u7c7b\u578b\uff0c\u9700\u8981\u8f6c\u6362\u6210\u5b57\u7b26\u4e32\u3002<\/span>\r\n<span class=\"hljs-comment\">\/\/ \u5bf9\u8c61\u7c7b\u578b\u4f1a\u8c03\u7528 toString \u65b9\u6cd5\u8f6c\u6362\u6210\u5b57\u7b26\u4e32 [object Object]\u3002<\/span>\r\na[b]=<span class=\"hljs-string\">'b'<\/span>;\r\n<span class=\"hljs-comment\">\/\/ c \u4e0d\u662f\u5b57\u7b26\u4e32\u4e5f\u4e0d\u662f Symbol \u7c7b\u578b\uff0c\u9700\u8981\u8f6c\u6362\u6210\u5b57\u7b26\u4e32\u3002<\/span>\r\n<span class=\"hljs-comment\">\/\/ \u5bf9\u8c61\u7c7b\u578b\u4f1a\u8c03\u7528 toString \u65b9\u6cd5\u8f6c\u6362\u6210\u5b57\u7b26\u4e32 [object Object]\u3002\u8fd9\u91cc\u4f1a\u628a b \u8986\u76d6\u6389\u3002<\/span>\r\na[c]=<span class=\"hljs-string\">'c'<\/span>;  \r\n<span class=\"hljs-comment\">\/\/ \u8f93\u51fa c<\/span>\r\n<span class=\"hljs-built_in\">console<\/span>.log(a[b]);\r\n<\/code><\/pre>\n<h3 id=\"articleHeader59\">10\u3001\u4e0b\u9762\u4ee3\u7801\u7684\u8f93\u51fa\u662f\u4ec0\u4e48?<\/h3>\n<pre class=\"javascript hljs\"><code class=\"js\">(<span class=\"hljs-function\"><span class=\"hljs-params\">()<\/span> =&gt;<\/span> {\r\n  <span class=\"hljs-keyword\">let<\/span> x, y;\r\n  <span class=\"hljs-keyword\">try<\/span> {\r\n    <span class=\"hljs-keyword\">throw<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">Error<\/span>();\r\n  } <span class=\"hljs-keyword\">catch<\/span> (x) {\r\n    (x = <span class=\"hljs-number\">1<\/span>), (y = <span class=\"hljs-number\">2<\/span>);\r\n    <span class=\"hljs-built_in\">console<\/span>.log(x);\r\n  }\r\n  <span class=\"hljs-built_in\">console<\/span>.log(x);\r\n  <span class=\"hljs-built_in\">console<\/span>.log(y);\r\n})();\r\n<\/code><\/pre>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<blockquote><p><code>1<\/code>\u00a0<code>undefined<\/code>\u00a0<code>2<\/code><\/p><\/blockquote>\n<p><code>catch<\/code>\u5757\u63a5\u6536\u53c2\u6570<code>x<\/code>\u3002\u5f53\u6211\u4eec\u4f20\u9012\u53c2\u6570\u65f6\uff0c\u8fd9\u4e0e\u53d8\u91cf\u7684<code>x<\/code>\u4e0d\u540c\u3002\u8fd9\u4e2a\u53d8\u91cf<code>x<\/code>\u662f\u5c5e\u4e8e<code>catch<\/code>\u4f5c\u7528\u57df\u7684\u3002<\/p>\n<p>\u4e4b\u540e\uff0c\u6211\u4eec\u5c06\u8fd9\u4e2a\u5757\u7ea7\u4f5c\u7528\u57df\u7684\u53d8\u91cf\u8bbe\u7f6e\u4e3a<code>1<\/code>\uff0c\u5e76\u8bbe\u7f6e\u53d8\u91cf<code>y<\/code>\u7684\u503c\u3002 \u73b0\u5728\uff0c\u6211\u4eec\u6253\u5370\u5757\u7ea7\u4f5c\u7528\u57df\u7684\u53d8\u91cf<code>x<\/code>\uff0c\u5b83\u7b49\u4e8e<code>1<\/code>\u3002<\/p>\n<p>\u5728<code>catch<\/code>\u5757\u4e4b\u5916\uff0c<code>x<\/code>\u4ecd\u7136\u662f<code>undefined<\/code>\uff0c\u800c<code>y<\/code>\u662f<code>2<\/code>\u3002 \u5f53\u6211\u4eec\u60f3\u5728<code>catch<\/code>\u5757\u4e4b\u5916\u7684<code>console.log(x)<\/code>\u65f6\uff0c\u5b83\u8fd4\u56de<code>undefined<\/code>\uff0c\u800c<code>y<\/code>\u8fd4\u56de<code>2<\/code>\u3002<\/p>\n<h3 id=\"articleHeader60\">11\u3001\u4e0b\u9762\u4ee3\u7801\u7684\u8f93\u51fa\u7ed3\u679c\u662f\u4ec0\u4e48\uff1f<\/h3>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">Foo<\/span>() <\/span>{\r\n    Foo.a = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>() <\/span>{\r\n        <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-number\">1<\/span>)\r\n    }\r\n    <span class=\"hljs-keyword\">this<\/span>.a = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>() <\/span>{\r\n        <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-number\">2<\/span>)\r\n    }\r\n}\r\nFoo.prototype.a = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>() <\/span>{\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-number\">3<\/span>)\r\n}\r\nFoo.a = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>() <\/span>{\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-number\">4<\/span>)\r\n}\r\nFoo.a();\r\n<span class=\"hljs-keyword\">let<\/span> obj = <span class=\"hljs-keyword\">new<\/span> Foo();\r\nobj.a();\r\nFoo.a();\r\n<\/code><\/pre>\n<p><code>\u53c2\u8003\u7b54\u6848<\/code><\/p>\n<blockquote><p>\u8f93\u51fa\u987a\u5e8f\u662f 4 2 1<\/p><\/blockquote>\n<div class=\"widget-codetool\">\n<div class=\"widget-codetool--inner\"><\/div>\n<\/div>\n<pre class=\"javascript hljs\"><code class=\"js\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">Foo<\/span>() <\/span>{\r\n    Foo.a = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>() <\/span>{\r\n        <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-number\">1<\/span>)\r\n    }\r\n    <span class=\"hljs-keyword\">this<\/span>.a = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>() <\/span>{\r\n        <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-number\">2<\/span>)\r\n    }\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u4ee5\u4e0a\u53ea\u662f Foo \u7684\u6784\u5efa\u65b9\u6cd5\uff0c\u6ca1\u6709\u4ea7\u751f\u5b9e\u4f8b\uff0c\u6b64\u523b\u4e5f\u6ca1\u6709\u6267\u884c<\/span>\r\n\r\nFoo.prototype.a = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>() <\/span>{\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-number\">3<\/span>)\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u73b0\u5728\u5728 Foo \u4e0a\u6302\u8f7d\u4e86\u539f\u578b\u65b9\u6cd5 a \uff0c\u65b9\u6cd5\u8f93\u51fa\u503c\u4e3a 3<\/span>\r\n\r\nFoo.a = <span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span>() <\/span>{\r\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-number\">4<\/span>)\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u73b0\u5728\u5728 Foo \u4e0a\u6302\u8f7d\u4e86\u76f4\u63a5\u65b9\u6cd5 a \uff0c\u8f93\u51fa\u503c\u4e3a 4<\/span>\r\n\r\nFoo.a();\r\n<span class=\"hljs-comment\">\/\/ \u7acb\u523b\u6267\u884c\u4e86 Foo \u4e0a\u7684 a \u65b9\u6cd5\uff0c\u4e5f\u5c31\u662f\u521a\u521a\u5b9a\u4e49\u7684\uff0c\u6240\u4ee5<\/span>\r\n<span class=\"hljs-comment\">\/\/ # \u8f93\u51fa 4<\/span>\r\n\r\n<span class=\"hljs-keyword\">let<\/span> obj = <span class=\"hljs-keyword\">new<\/span> Foo();\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001\u4ec0\u4e48\u662f\u9632\u6296\u548c\u8282\u6d41\uff1f\u6709\u4ec0\u4e48\u533a\u522b\uff1f\u5982\u4f55\u5b9e\u73b0\uff1f \u53c2\u8003\u7b54\u6848 \u9632\u6296 \u89e6\u53d1\u9ad8\u9891\u4e8b\u4ef6\u540en\u79d2\u5185\u51fd\u6570\u53ea\u4f1a\u6267\u884c\u4e00\u6b21\uff0c\u5982\u679cn\u79d2\u5185 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,3],"tags":[],"_links":{"self":[{"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/posts\/159"}],"collection":[{"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/comments?post=159"}],"version-history":[{"count":2,"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/posts\/159\/revisions"}],"predecessor-version":[{"id":161,"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/posts\/159\/revisions\/161"}],"wp:attachment":[{"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/media?parent=159"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/categories?post=159"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/tags?post=159"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}