{"id":220,"date":"2020-01-14T13:05:31","date_gmt":"2020-01-14T05:05:31","guid":{"rendered":"http:\/\/blog.adeying.com\/?p=220"},"modified":"2020-01-14T13:05:31","modified_gmt":"2020-01-14T05:05:31","slug":"%e5%89%8d%e7%ab%af%e5%b7%a5%e5%85%b7%e7%b1%bb%e5%86%99%e4%bb%a3%e7%a0%81%e5%ad%a6%e4%b9%a0%e6%8a%80%e5%b7%a7%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/adeqing.com\/index.php\/2020\/01\/14\/develop\/es6\/220\/","title":{"rendered":"\u524d\u7aef\u5de5\u5177\u7c7b\u5199\u4ee3\u7801\u5b66\u4e60\u6280\u5de7\u603b\u7ed3"},"content":{"rendered":"

\u524d\u8a00<\/h2>\n

\u6211\u4eec\u5728\u9762\u8bd5\u7684\u65f6\u5019\uff0c\u7ecf\u5e38\u4f1a\u88ab\u9762\u8bd5\u5b98\u95ee\u5230\u51e0\u4e2a\u624b\u5199\u4ee3\u7801\u7684\u95ee\u9898\u3002\u624b\u5199\u4e00\u4e2a\u6570\u7ec4\u53bb\u91cd\u590d\uff0c\u6df1\u62f7\u8d1d\uff0c\u6570\u7ec4\u62cd\u5e73\u7b49\u7b49\u3002\u6709\u4e9b\u5c0f\u4f19\u4f34\u9762\u8bd5\u4e4b\u524d\u51c6\u5907\u4e86\uff0c\u4f46\u662f\u5728\u7f16\u5199\u7684\u65f6\u5019\u8fd8\u662f\u4f1a\u5fd8\u6389\uff0c\u672c\u6587\u603b\u7ed3\u4e86\u4e00\u4e2a\u5982\u4f55\u5e94\u5bf9\u624b\u5199\u4ee3\u7801\u7684\u5927\u7eb2<\/strong>\uff0c\u524d\u9762\u662f\u4e00\u4e9b\u57fa\u7840\u5185\u5bb9\uff0c\u4f46\u662f\u4e5f\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u4f60\uff0c\u90fd\u4f1a\u5c31\u5f53\u590d\u4e60\u4e00\u904d\uff0c\u563f\u563f\u3002<\/p>\n

1. \u8d77\u540d\u5b57\u4e0e\u5177\u4f53\u529f\u80fd\u8003\u8651<\/h2>\n

\u8d77\u540d\u5b57<\/h3>\n

\u624b\u5199\u51fd\u6570\u7684\u65f6\u5019\uff0c\u6211\u6bcf\u6b21\u7ed9\u53c2\u6570\u6216\u8005\u51fd\u6570\u8d77\u540d\u5b57\u90fd\u8981\u72b9\u8c6b\u90a3\u4e48\u51e0\u79d2\u3002\u9762\u8bd5\u5b98\u8fd8\u4ee5\u4e3a\u6211\u4e0d\u4f1a\u5199\u561e!<\/p>\n

    \n
  • \n
    \u4ee3\u7801\u89c4\u8303\u9075\u5b88<\/section>\n<\/li>\n
  • \n
    \u51fd\u6570\u540d\u79f0\u76f4\u63a5\u4f7f\u7528\u529f\u80fd\u82f1\u6587\u547d\u540d(\u8fd9\u91cc\u4f60\u5fc5\u987b\u77e5\u9053\u4f60\u8981\u624b\u5199\u7684\u51fd\u6570\u8981\u5b9e\u73b0\u4ec0\u4e48\u529f\u80fd)<\/section>\n<\/li>\n
  • \n
    \u81f3\u4e8e\u4f20\u9012\u7684\u53c2\u6570\uff0c\u8fd8\u6709\u51fd\u6570\u5185\u90e8\u58f0\u660e\u7684\u4e00\u4e9b\u6570\u7ec4\uff0c\u53d8\u91cf\u7b49\uff0c\u5b8c\u5168\u4e0d\u8981\u8003\u8651\u592a\u591a\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528arr<\/code>\u00a0\u548c\u00a0arr+\u529f\u80fd\u540d\u79f0<\/code>\u00a0\u7b80\u5199\u3002<\/section>\n<\/li>\n<\/ul>\n

    \u5176\u5b9e\u76f4\u63a5\u53ef\u4ee5\u4f7f\u7528 arr1\uff0carr2 \u6765\u4ee3\u66ff\uff0c\u80fd\u533a\u5206\u5f00\u5c31\u597d\u4e86,\u522b\u5728\u72b9\u8c6b\u8fd9\u79cd\u4e8b\u6d6a\u8d39\u65f6\u95f4\u3002<\/p>\n

    2. \u65b0\u53d8\u91cf\u4e0e\u8fd4\u56de\u503c<\/h2>\n

    \u770b\u5b8c\u4e00\u9053\u624b\u5199\u9762\u8bd5\u9898\uff0c\u53ef\u4ee5\u5148\u770b\u4e0b\u662f\u5426\u9700\u8981\u58f0\u660e\u65b0\u53d8\u91cf\uff0c\u9700\u8981\u8fd4\u56de\u7684\u7ed3\u679c\u548c\u7ed3\u679c\u7c7b\u578b\u7b49\u3002<\/p>\n

      \n
    • \n
      \u6570\u7ec4\u62cd\u5e73 \u80af\u5b9a\u9700\u8981\u8fd4\u56de\u4e00\u4e2a\u6570\u7ec4<\/strong>\uff0c\u53ef\u4ee5\u8003\u8651\u5728\u521d\u671f\u58f0\u660e\u4e00\u4e2a\u6570\u7ec4\u7684\u65b9\u5f0f\uff0c\u4e5f\u53ef\u4ee5\u8003\u8651\u4f7f\u7528 map\uff0cfliter\u7b49\u51fd\u6570\u76f4\u63a5\u8fd4\u56de\u3002<\/section>\n<\/li>\n
    • \n
      \u5bf9\u8c61\u6df1\u62f7\u8d1d \u80af\u5b9a\u9700\u8981\u8fd4\u56de\u4e00\u4e2a\u4e00\u4e2a\u62f7\u8d1d\u540e\u7684\u5bf9\u8c61\uff0c\u5728\u521d\u671f\u4f1a\u58f0\u660e\u4e00\u4e2a\u7a7a\u5bf9\u8c61<\/strong>\uff0c\u6700\u540e\u8fd4\u56de<\/strong>\u8fd9\u4e2a\u5904\u7406\u8fc7\u7684\u5bf9\u8c61<\/strong>\u3002<\/section>\n<\/li>\n
    • \n
      \u5f88\u591a\u60c5\u51b5\u53ef\u4ee5\u58f0\u660e\u65b0\u53d8\u91cf\u6216\u8005\u4e0d\u58f0\u660e\u65b0\u53d8\u91cf\uff0c\u90fd\u80fd\u89e3\u51b3\u95ee\u9898\uff0c\u4f46\u662f\u5c31\u8981\u8003\u8651\u5230\u65f6\u95f4\u590d\u6742\u5ea6\u548c\u7a7a\u95f4\u590d\u6742\u5ea6\u4e86\uff0c\u5148\u7528\u4e00\u79cd\u5b9e\u73b0\u5c31\u597d\u3002\u9762\u8bd5\u5b98\u4f1a\u7ee7\u7eed\u95ee\u4f60\u6709\u6ca1\u6709\u5176\u4ed6\u65b9\u6848\u7684\uff0c\u563f\u563f\u3002<\/section>\n<\/li>\n<\/ul>\n

      3. \u8003\u8651\u662f\u7528\u5faa\u73af\uff1f\u9012\u5f52\uff1f<\/h2>\n

      \u5faa\u73af<\/h3>\n

      for \u5faa\u73af<\/h4>\n
        \n
      1. \n
        for \u6709\u4e09\u4e2a\u8868\u8fbe\u5f0f\uff1a\u2460\u58f0\u660e\u5faa\u73af\u53d8\u91cf\uff1b\u2461\u5224\u65ad\u5faa\u73af\u6761\u4ef6\uff1b\u2462\u66f4\u65b0\u5faa\u73af\u53d8\u91cf\uff1b\u3000\u3000\u3000\u3000\u4e09\u4e2a\u8868\u8fbe\u5f0f\u4e4b\u95f4\uff0c\u7528;\u5206\u5272\uff0cfor \u5faa\u73af\u4e09\u4e2a\u8868\u8fbe\u5f0f\u90fd\u53ef\u4ee5\u7701\u7565\uff0c\u4f46\u662f\u4e24\u4e2a\u201c;\u201d\u7f3a\u4e00\u4e0d\u53ef\u3002<\/section>\n<\/li>\n
      2. \n
        for \u5faa\u73af\u7684\u6267\u884c\u7279\u70b9\uff1a\u5148\u5224\u65ad\u518d\u6267\u884c\uff0c\u4e0e while \u76f8\u540c<\/section>\n<\/li>\n
      3. \n
        for \u5faa\u73af\u4e09\u4e2a\u8868\u8fbe\u5f0f\u90fd\u53ef\u4ee5\u6709\u591a\u90e8\u5206\u7ec4\u6210\uff0c\u7b2c\u4e8c\u90e8\u5206\u591a\u4e2a\u5224\u65ad\u6761\u4ef6\u7528&& ||\u8fde\u63a5\uff0c\u7b2c\u4e00\u4e09\u90e8\u5206\u7528\u9017\u53f7\u5206\u5272\uff1b<\/section>\n<\/li>\n<\/ol>\n
        for (var num =1; num<=10; num++) {\r\n    document.write(num+\" <br \/>\"); \/\/1 2 3 4 5 6 7 8 9 10\r\n}\r\n<\/code><\/pre>\n
        for in \u5faa\u73af<\/h4>\n
        for-in \u5faa\u73af\u4e3b\u8981\u7528\u4e8e\u904d\u5386\u5bf9\u8c61 \u3000\u3000for() \u4e2d\u7684\u683c\u5f0f\uff1afor(keys in object){} \u3000\u3000keys \u8868\u793a obj \u5bf9\u8c61\u7684\u6bcf\u4e00\u4e2a\u952e\u503c\u5bf9\u7684\u952e\uff01\uff01\u6240\u6709\u5faa\u73af\u4e2d\uff0c\u9700\u8981\u4f7f\u7528obj[keys]\u6765\u53d6\u5230\u6bcf\u4e00\u4e2a\u503c\uff01\uff01\uff01<\/p>\n
        for-in \u5faa\u73af\uff0c\u904d\u5386\u65f6\u4e0d\u4ec5\u80fd\u8bfb\u53d6\u5bf9\u8c61\u81ea\u8eab\u4e0a\u9762\u7684\u6210\u5458\u5c5e\u6027\uff0c\u4e5f\u80fd\u5ef6\u7eed\u539f\u578b\u94fe\u904d\u5386\u51fa\u5bf9\u8c61\u7684\u539f\u578b\u5c5e\u6027 \u3000\u3000\u6240\u4ee5\uff0c\u53ef\u4ee5\u4f7f\u7528 hasOwnProperty \u5224\u65ad\u4e00\u4e2a\u5c5e\u6027\u662f\u4e0d\u662f\u5bf9\u8c61\u81ea\u8eab\u4e0a\u7684\u5c5e\u6027<\/p>\n
        obj.hasOwnProperty(keys)==true \u8868\u793a\u8fd9\u4e2a\u5c5e\u6027\u662f\u5bf9\u8c61\u7684\u6210\u5458\u5c5e\u6027\uff0c\u800c\u4e0d\u662f\u539f\u5148\u5c5e\u6027\u3002<\/p>\n
        \/\/\u58f0\u660e\u4e00\u4e2aPeson\u7c7b\r\nfunction Person(){\r\n    this.name = \"kaola\";\r\n    this.age = 24;\r\n    this.func1 = function(){\r\n        \r\n    }\r\n}\r\n\/\/\u5b9e\u4f8b\u5316\u8fd9\u4e2a\u7c7b\r\nvar bei = new Person();\r\n\/\/\u4f7f\u7528for-in\u904d\u5386\u8fd9\u4e2a\u5bf9\u8c61\r\nfor(keys in bei){\r\n    console.log(bei[keys])\r\n}\r\n<\/code><\/pre>\n
        for of \u5faa\u73af<\/h4>\n
        ES6 \u501f\u9274 C++\u3001Java\u3001C# \u548c Python \u8bed\u8a00\uff0c\u5f15\u5165\u4e86 for…of \u5faa\u73af\uff0c\u4f5c\u4e3a\u904d\u5386\u6240\u6709\u6570\u636e\u7ed3\u6784\u7684\u7edf\u4e00\u7684\u65b9\u6cd5\u3002<\/p>\n
        \u4e00\u4e2a\u6570\u636e\u7ed3\u6784\u53ea\u8981\u90e8\u7f72\u4e86 Symbol.iterator \u5c5e\u6027\uff0c\u5c31\u88ab\u89c6\u4e3a\u5177\u6709 iterator \u63a5\u53e3\uff0c\u5c31\u53ef\u4ee5\u7528 for…of \u5faa\u73af\u904d\u5386\u5b83\u7684\u6210\u5458\u3002\u4e5f\u5c31\u662f\u8bf4\uff0cfor…of \u5faa\u73af\u5185\u90e8\u8c03\u7528\u7684\u662f\u6570\u636e\u7ed3\u6784\u7684 Symbol.iterator \u65b9\u6cd5\u3002<\/p>\n
        for…of \u5faa\u73af\u53ef\u4ee5\u4f7f\u7528\u7684\u8303\u56f4\u5305\u62ec\u6570\u7ec4\u3001Set \u548c Map \u7ed3\u6784\u3001\u67d0\u4e9b\u7c7b\u4f3c\u6570\u7ec4\u7684\u5bf9\u8c61\uff08\u6bd4\u5982arguments\u5bf9\u8c61\u3001DOM NodeList \u5bf9\u8c61\uff09\u3001\u540e\u6587\u7684 Generator \u5bf9\u8c61\uff0c\u4ee5\u53ca\u5b57\u7b26\u4e32\u3002<\/p>\n
        \u9012\u5f52<\/h3>\n
        \u5173\u4e8e\u9012\u5f52\u7684\u8be6\u7ec6\u5185\u5bb9\u53ef\u4ee5\u770b\u6211\u7684\u8fd9\u7bc7\u6587\u7ae0\uff0c\u804a\u804a\u9762\u8bd5\u5fc5\u8003-\u9012\u5f52\u601d\u60f3\u4e0e\u5b9e\u6218\u00a0\u6587\u7ae0\u4e2d\u5e38\u7528\u7684\u9012\u5f52\u624b\u5199\u4ee3\u7801\u90fd\u7528\u5199\u5230\u3002<\/p>\n
        4. \u8003\u8651\u754c\u9650<\/h2>\n
        4.1 \u7c7b\u578b\u5224\u65ad<\/h3>\n
        \u2605\u5982\u4f55\u5224\u65ad\u6570\u636e\u7c7b\u578b\uff1f\u600e\u4e48\u5224\u65ad\u4e00\u4e2a\u503c\u5230\u5e95\u662f\u6570\u7ec4\u7c7b\u578b\u8fd8\u662f\u5bf9\u8c61?<\/p>\n
        \u201d<\/p><\/blockquote>\n
        \u4e09\u79cd\u65b9\u5f0f\uff0c\u5206\u522b\u4e3a\u00a0typeof<\/code>\u3001instanceof<\/code>\u00a0\u548cObject.prototype.toString.call()<\/code><\/p>\n
        typeof<\/h4>\n
        \u901a\u8fc7\u00a0typeof<\/code>\u64cd\u4f5c\u7b26\u6765\u5224\u65ad\u4e00\u4e2a\u503c\u5c5e\u4e8e\u54ea\u79cd\u57fa\u672c\u7c7b\u578b\u3002<\/p>\n
        typeof'seymoe'\/\/ 'string'\r\ntypeoftrue\/\/ 'boolean'\r\ntypeof10\/\/ 'number'\r\ntypeofSymbol()    \/\/ 'symbol'\r\ntypeofnull\/\/ 'object' \u65e0\u6cd5\u5224\u5b9a\u662f\u5426\u4e3a null\r\ntypeofundefined\/\/ 'undefined'\r\n\r\ntypeof {}           \/\/ 'object'\r\ntypeof []           \/\/ 'object'\r\ntypeof(() => {})    \/\/ 'function'\r\n<\/code><\/pre>\n
        \u4e0a\u9762\u4ee3\u7801\u7684\u8f93\u51fa\u7ed3\u679c\u53ef\u4ee5\u770b\u51fa\uff0c<\/p>\n
          \n
        1. \n
          null<\/code>\u00a0\u7684\u5224\u5b9a\u6709\u8bef\u5dee\uff0c\u5f97\u5230\u7684\u7ed3\u679c \u5982\u679c\u4f7f\u7528\u00a0typeof null<\/code>\u5f97\u5230\u7684\u7ed3\u679c\u662fobject<\/code><\/section>\n<\/li>\n
        2. \n
          \u64cd\u4f5c\u7b26\u5bf9\u5bf9\u8c61\u7c7b\u578b\u53ca\u5176\u5b50\u7c7b\u578b\uff0c\u4f8b\u5982\u51fd\u6570\uff08\u53ef\u8c03\u7528\u5bf9\u8c61\uff09\u3001\u6570\u7ec4\uff08\u6709\u5e8f\u7d22\u5f15\u5bf9\u8c61\uff09\u7b49\u8fdb\u884c\u5224\u5b9a\uff0c\u5219\u9664\u4e86\u51fd\u6570\u90fd\u4f1a\u5f97\u5230\u00a0object<\/code>\u00a0\u7684\u7ed3\u679c\u3002<\/section>\n<\/li>\n<\/ol>\n
          \u5728\u5bf9\u8c61\u7684\u5b50\u7c7b\u578b\u548cnull<\/code>\u60c5\u51b5\u4e0b,\u53ef\u4ee5\u770b\u51fatypeOf<\/code>\u5bf9\u4e8e\u5224\u65ad\u7c7b\u578b\u8fd8\u6709\u4e00\u4e9b\u4e0d\u8db3\u3002<\/p>\n
          instanceof<\/h4>\n
          \u901a\u8fc7\u00a0instanceof<\/code>\u00a0\u64cd\u4f5c\u7b26\u4e5f\u53ef\u4ee5\u5bf9\u5bf9\u8c61\u7c7b\u578b\u8fdb\u884c\u5224\u5b9a\uff0c\u5176\u539f\u7406\u5c31\u662f\u6d4b\u8bd5\u6784\u9020\u51fd\u6570\u7684prototype<\/code>\u00a0\u662f\u5426\u51fa\u73b0\u5728\u88ab\u68c0\u6d4b\u5bf9\u8c61\u7684\u539f\u578b\u94fe\u4e0a\u3002<\/p>\n
          [] instanceofArray\/\/ true\r\n({}) instanceofObject\/\/ true\r\n(()=>{}) instanceofFunction\/\/ true\r\n<\/code><\/pre>\n
          \u590d\u5236\u4ee3\u7801\u6ce8\u610f\uff1ainstanceof<\/code>\u00a0\u4e5f\u4e0d\u662f\u4e07\u80fd\u7684\u3002<\/p>\n
          \u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
          let arr = []\r\nlet obj = {}\r\narr instanceofArray\/\/ true\r\narr instanceofObject\/\/ true\r\nobj instanceofObject\/\/ true\r\nobj instanceofArray\/\/ false\r\n<\/code><\/pre>\n
          \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0carr<\/code>\u00a0\u6570\u7ec4\u76f8\u5f53\u4e8e\u00a0new Array()<\/code>\u00a0\u51fa\u7684\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u6240\u4ee5\u00a0arr.__proto__ === Array.prototype<\/code>\uff0c\u53c8\u56e0\u4e3a\u00a0Array<\/code>\u5c5e\u4e8e\u00a0Object<\/code>\u00a0\u5b50\u7c7b\u578b\uff0c\u5373Array.prototype.__proto__ === Object.prototype<\/code>\uff0c\u56e0\u6b64\u00a0Object<\/code>\u00a0\u6784\u9020\u51fd\u6570\u5728\u00a0arr<\/code>\u00a0\u7684\u539f\u578b\u94fe\u4e0a\u3002\u6240\u4ee5\u00a0instanceof<\/code>\u00a0\u4ecd\u7136\u65e0\u6cd5\u4f18\u96c5\u7684\u5224\u65ad\u4e00\u4e2a\u503c\u5230\u5e95\u5c5e\u4e8e\u6570\u7ec4\u8fd8\u662f\u666e\u901a\u5bf9\u8c61\u3002<\/p>\n
          \u8fd8\u6709\u4e00\u70b9\u9700\u8981\u8bf4\u660e\u4e0b\uff0c\u6709\u4e9b\u5f00\u53d1\u8005\u4f1a\u8bf4\u00a0Object.prototype.__proto__ === null<\/code>\uff0c\u5c82\u4e0d\u662f\u8bf4\u00a0arr instanceof null<\/code>\u00a0\u4e5f\u5e94\u8be5\u4e3a\u00a0true<\/code>\uff0c\u8fd9\u4e2a\u8bed\u53e5\u5176\u5b9e\u4f1a\u62a5\u9519\u63d0\u793a\u53f3\u4fa7\u53c2\u6570\u5e94\u8be5\u4e3a\u5bf9\u8c61\uff0c\u8fd9\u4e5f\u5370\u8bc1\u00a0typeof null<\/code>\u00a0\u7684\u7ed3\u679c\u4e3a\u00a0object<\/code>\u00a0\u771f\u7684\u53ea\u662fjavascript<\/code>\u4e2d\u7684\u4e00\u4e2abug<\/code>\u00a0\u3002<\/p>\n
          Object.prototype.toString()<\/code>\u00a0\uff08\u63a8\u8350\u6b3e\uff09<\/h4>\n
          \u53ef\u4ee5\u8bf4\u662f\u5224\u5b9a\u00a0JavaScript<\/code>\u00a0\u4e2d\u6570\u636e\u7c7b\u578b\u7684\u7ec8\u6781\u89e3\u51b3\u65b9\u6cd5\u4e86\uff0c\u5177\u4f53\u7528\u6cd5\u8bf7\u770b\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n
          Object.prototype.toString.call({})              \/\/ '[object Object]'\r\nObject.prototype.toString.call([])              \/\/ '[object Array]'\r\nObject.prototype.toString.call(() => {})        \/\/ '[object Function]'\r\nObject.prototype.toString.call('seymoe')        \/\/ '[object String]'\r\nObject.prototype.toString.call(1)               \/\/ '[object Number]'\r\nObject.prototype.toString.call(true)            \/\/ '[object Boolean]'\r\nObject.prototype.toString.call(Symbol())        \/\/ '[object Symbol]'\r\nObject.prototype.toString.call(null)            \/\/ '[object Null]'\r\nObject.prototype.toString.call(undefined)       \/\/ '[object Undefined]'\r\n\r\nObject.prototype.toString.call(newDate())      \/\/ '[object Date]'\r\nObject.prototype.toString.call(Math)            \/\/ '[object Math]'\r\nObject.prototype.toString.call(newSet())       \/\/ '[object Set]'\r\nObject.prototype.toString.call(newWeakSet())   \/\/ '[object WeakSet]'\r\nObject.prototype.toString.call(newMap())       \/\/ '[object Map]'\r\nObject.prototype.toString.call(newWeakMap())   \/\/ '[object WeakMap]'\r\n<\/code><\/pre>\n
          \u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\u8be5\u65b9\u6cd5\u5728\u4f20\u5165\u4efb\u4f55\u7c7b\u578b\u7684\u503c\u90fd\u80fd\u8fd4\u56de\u5bf9\u5e94\u51c6\u786e\u7684\u5bf9\u8c61\u7c7b\u578b\u3002\u7528\u6cd5\u867d\u7b80\u5355\u660e\u4e86\uff0c\u4f46\u5176\u4e2d\u6709\u51e0\u4e2a\u70b9\u9700\u8981\u7406\u89e3\u6e05\u695a\uff1a<\/p>\n
            \n
          • \n
            \u8be5\u65b9\u6cd5\u672c\u8d28\u5c31\u662f\u4f9d\u6258Object.prototype.toString()<\/code>\u65b9\u6cd5\u5f97\u5230\u5bf9\u8c61\u5185\u90e8\u5c5e\u6027\u00a0[[Class]]<\/code><\/section>\n<\/li>\n
          • \n
            \u4f20\u5165\u539f\u59cb\u7c7b\u578b\u5374\u80fd\u591f\u5224\u5b9a\u51fa\u7ed3\u679c\u662f\u56e0\u4e3a\u5bf9\u503c\u8fdb\u884c\u4e86\u5305\u88c5<\/section>\n<\/li>\n
          • \n
            null<\/code>\u00a0\u548c\u00a0undefined<\/code>\u00a0\u80fd\u591f\u8f93\u51fa\u7ed3\u679c\u662f\u5185\u90e8\u5b9e\u73b0\u6709\u505a\u5904\u7406<\/section>\n<\/li>\n<\/ul>\n
            \u5bf9\u4e8e\u7c7b\u578b\u5224\u65ad\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 Object.prototype.toString() \u8fdb\u884c\u4e00\u4e2a\u7b80\u5355\u7684\u5c01\u88c5,\u8fd9\u6837\u6211\u4eec\u518d\u5224\u65ad\u7c7b\u578b\u7684\u65f6\u5019\uff0c\u76f4\u63a5\u4f7f\u7528 type \u51fd\u6570\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n
            \u4ee3\u7801\u5982\u4e0b:<\/p>\n
            var type = function(data) {\r\n      var toString = Object.prototype.toString;\r\n      var dataType = toString\r\n              .call(data)\r\n              .replace(\/\\[object\\s(.+)\\]\/, \"$1\")\r\n              .toLowerCase()\r\n      return dataType\r\n};\r\n<\/code><\/pre>\n
            Array.isArray()<\/h4>\n
            Array.isArray \u4e5f\u53ef\u4ee5\u5224\u65ad\u4f20\u9012\u53c2\u6570\u662f\u5426\u662f\u6570\u7ec4\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\u8fd9\u662f\u00a0Array.isArray<\/code>\u00a0\u662f\u00a0ES 5.1<\/code>\u00a0\u63a8\u51fa\u7684\uff0c\u4e0d\u652f\u6301\u00a0IE6~8<\/code>\uff0c\u6240\u4ee5\u5728\u4f7f\u7528\u7684\u65f6\u5019\u4e5f\u5e94\u6ce8\u610f\u517c\u5bb9\u95ee\u9898\u3002<\/p>\n
              \n
            • \n
              \u51fa\u73b0\u4e0d\u517c\u5bb9\u95ee\u9898\u89e3\u51b3\u529e\u6cd5<\/p>\n
              if (!Array.isArray) {\r\n  Array.isArray = function(arg) {\r\n    returnObject.prototype.toString.call(arg) === '[object Array]';\r\n  };\r\n}\r\n<\/code><\/pre>\n<\/section>\n<\/li>\n<\/ul>\n
              4.2 \u7a7a\u503c\u5224\u65ad<\/h3>\n
              \u7a7a\u503c\u5224\u65ad\u7684\u91cd\u8981\u6027<\/h4>\n
              if([]) {\r\n    console.log('true');\r\n  } else {\r\n    consoel.log('false');\r\n  }\r\n  \/\/ res\uff1atrue\r\n  \r\n  if({}) {\r\n    console.log('true');\r\n  } else {\r\n    consoel.log('false');\r\n  }\r\n  \/\/ res\uff1atrue\r\n<\/code><\/pre>\n
              \u770b\u8fd9\u6bb5\u4ee3\u7801\uff0c\u4e0d\u77e5\u9053\u6709\u6ca1\u6709\u5c0f\u4f19\u4f34\u4f1a\u8ba4\u4e3a\u8f93\u51fafalse\uff0c\u4ee5\u4e0a\u5bf9\u8c61\u548c\u6570\u7ec4\u867d\u7136\u4e3a\u7a7a\uff0c\u4f46\u662f\u4f1a\u88ab\u8f6c\u6362\u4e3ature\uff0c\u6240\u4ee5\u5728\u5199\u4e00\u4e9b\u5224\u65ad\u6761\u4ef6\u65f6\u5019\u8981\u683c\u5916\u6ce8\u610f\u3002<\/p>\n
              \u7a7a\u6570\u7ec4\u5224\u65ad<\/h4>\n
              \u6570\u7ec4\u4e3a\u7a7a\u5f88\u7b80\u5355\uff0c\u901a\u8fc7\u4e0a\u9762\u7684\u7c7b\u578b\u5224\u65ad\u662f\u6570\u7ec4\u7c7b\u578b\uff0c\u7136\u540e\u5b83\u7684length>0<\/code>\u5373\u53ef<\/p>\n
              \u7a7a\u5bf9\u8c61\u5224\u65ad<\/h4>\n
                \n
              1. \n
                Object.getOwnPropertyNames()\u4f7f\u7528Object.getOwnPropertyNames()<\/code>\u3002\u8fd4\u56de\u503c\u662f\u5bf9\u8c61\u4e2d\u5c5e\u6027\u660e\u540d\u6210\u7684\u6570\u7ec4<\/p>\n
                var obj = {}\r\nObject.getOwnPropertyNames(obj).length === 0; \/\/ true\r\n<\/code><\/pre>\n<\/section>\n<\/li>\n
              2. \n
                json \u5bf9\u8c61\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u5c06json\u5bf9\u8c61\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff0c\u7136\u540e\u6bd4\u8f83\u8be5\u5b57\u7b26\u4e32\u4e0e”{}”\u662f\u5426\u76f8\u7b49<\/p>\n
                var obj = {};\r\nvar a = JSON.stringify(obj);\r\na === \"{}\"; \/\/ true\r\n\/\/ a === {}; \/\/ false\r\n<\/code><\/pre>\n<\/section>\n<\/li>\n
              3. \n
                for…in… \u5faa\u73af\u5224\u65ad<\/p>\n
                var obj = {};\r\n\r\nfunction judgeObj(obj) {\r\n  for(let key in obj) {\r\n    returnfalse\r\n  }\r\n  returntrue\r\n};\r\n\r\njudgeObj(obj); \/\/ true\r\n<\/code><\/pre>\n<\/section>\n<\/li>\n
              4. \n
                Object.keys()\u4f7f\u7528Object.keys()\u3002ES6\u7684\u65b0\u65b9\u6cd5\uff0c\u8fd4\u56de\u503c\u540c\u6837\u662f\u5c5e\u6027\u540d\u7ec4\u6210\u7684\u6570\u7ec4<\/p>\n
                var obj = {}\r\nObject.keys(obj).length === 0; \/\/ true\r\n<\/code><\/pre>\n<\/section>\n<\/li>\n
              5. \n
                \u76f4\u63a5\u4f7f\u7528\u5bf9\u8c61\u5c5e\u6027\u5224\u65ad \u524d\u63d0\u662f\u8981\u786e\u5b9a\u5982\u679cobj\u4e0d\u4e3a\u7a7a\uff0c\u4e00\u5b9a\u4f1a\u5305\u542bname\u5c5e\u6027<\/p>\n
                var obj = {};\r\n\r\nobj && obj.name ? '\u4e0d\u4e3a\u7a7a' : '\u4e3a\u7a7a'; \/\/\r\n<\/code><\/pre>\n<\/section>\n<\/li>\n<\/ol>\n
                4.3 \u7b49\u53f7\u4f7f\u7528<\/h3>\n
                \u6bd4\u8f83\u8fc7\u7a0b\uff1a<\/p>\n
                  \n
                • \n
                  \u53cc\u7b49\u53f7==\uff1a<\/section>\n<\/li>\n<\/ul>\n
                  \uff081\uff09\u5982\u679c\u4e24\u4e2a\u503c\u7c7b\u578b\u76f8\u540c\uff0c\u518d\u8fdb\u884c\u4e09\u4e2a\u7b49\u53f7(===)\u7684\u6bd4\u8f83<\/p>\n
                  \uff082\uff09\u5982\u679c\u4e24\u4e2a\u503c\u7c7b\u578b\u4e0d\u540c\uff0c\u4e5f\u6709\u53ef\u80fd\u76f8\u7b49\uff0c\u9700\u6839\u636e\u4ee5\u4e0b\u89c4\u5219\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u5728\u6bd4\u8f83\uff1a<\/p>\n
                  1\uff09\u5982\u679c\u4e00\u4e2a\u662fnull\uff0c\u4e00\u4e2a\u662fundefined\uff0c\u90a3\u4e48\u76f8\u7b49<\/p>\n
                  2\uff09\u5982\u679c\u4e00\u4e2a\u662f\u5b57\u7b26\u4e32\uff0c\u4e00\u4e2a\u662f\u6570\u503c\uff0c\u628a\u5b57\u7b26\u4e32\u8f6c\u6362\u6210\u6570\u503c\u4e4b\u540e\u518d\u8fdb\u884c\u6bd4\u8f83<\/p>\n
                    \n
                  • \n
                    \u4e09\u7b49\u53f7===:<\/section>\n<\/li>\n<\/ul>\n
                    \uff081\uff09\u5982\u679c\u7c7b\u578b\u4e0d\u540c\uff0c\u5c31\u4e00\u5b9a\u4e0d\u76f8\u7b49<\/p>\n
                    \uff082\uff09\u5982\u679c\u4e24\u4e2a\u90fd\u662f\u6570\u503c\uff0c\u5e76\u4e14\u662f\u540c\u4e00\u4e2a\u503c\uff0c\u90a3\u4e48\u76f8\u7b49\uff1b\u5982\u679c\u5176\u4e2d\u81f3\u5c11\u4e00\u4e2a\u662fNaN\uff0c\u90a3\u4e48\u4e0d\u76f8\u7b49\u3002\uff08\u5224\u65ad\u4e00\u4e2a\u503c\u662f\u5426\u662fNaN\uff0c\u53ea\u80fd\u4f7f\u7528isNaN( ) \u6765\u5224\u65ad\uff09<\/p>\n
                    \uff083\uff09\u5982\u679c\u4e24\u4e2a\u90fd\u662f\u5b57\u7b26\u4e32\uff0c\u6bcf\u4e2a\u4f4d\u7f6e\u7684\u5b57\u7b26\u90fd\u4e00\u6837\uff0c\u90a3\u4e48\u76f8\u7b49\uff0c\u5426\u5219\u4e0d\u76f8\u7b49\u3002<\/p>\n
                    \uff084\uff09\u5982\u679c\u4e24\u4e2a\u503c\u90fd\u662ftrue\uff0c\u6216\u662ffalse\uff0c\u90a3\u4e48\u76f8\u7b49<\/p>\n
                    \uff085\uff09\u5982\u679c\u4e24\u4e2a\u503c\u90fd\u5f15\u7528\u540c\u4e00\u4e2a\u5bf9\u8c61\u6216\u662f\u51fd\u6570\uff0c\u90a3\u4e48\u76f8\u7b49\uff0c\u5426\u5219\u4e0d\u76f8\u7b49<\/p>\n
                    \uff086\uff09\u5982\u679c\u4e24\u4e2a\u503c\u90fd\u662fnull\uff0c\u6216\u662fundefined\uff0c\u90a3\u4e48\u76f8\u7b49<\/p>\n
                    5. \u6570\u7ec4 \u5b57\u7b26\u4e32 \u5bf9\u8c61 \u5e38\u7528\u51fd\u6570\u638c\u63e1<\/h2>\n
                    5.1 \u6570\u7ec4\u90e8\u5206\u5e38\u7528\u51fd\u6570<\/h3>\n
                    splice\u51fd\u6570(\u6539\u53d8\u539f\u59cb\u6570\u7ec4)<\/h4>\n
                      \n
                    • \n
                      \u6709\u5411\u6570\u7ec4\u6307\u5b9a\u4f4d\u7f6e\u6dfb\u52a0\u5143\u7d20\u7684\u529f\u80fd<\/section>\n<\/li>\n<\/ul>\n
                      Array.splice(begin, deleteCount, addItem1, addItem2...)<\/code><\/p>\n
                      \/\/ a\u7684\u521d\u59cb\u503c\uff1a[1,2,3,4,5]\r\n\r\nvar b = arr.splice(1,2)\r\n\/\/ a: [1,4,5]\r\n\/\/ b: [2,3]\r\n\r\nvar c = arr.splice(1,2,777,888)\r\n\/\/ a: [1,777,888,4,5]\r\n\/\/ b: [2,3]\r\n<\/code><\/pre>\n
                      slice \u51fd\u6570(\u4e0d\u6539\u53d8\u539f\u6570\u7ec4\uff0c\u521b\u5efa\u65b0\u6570\u7ec4)<\/h4>\n
                      slice() \u65b9\u6cd5\u5c06\u6570\u7ec4\u4e2d\u4e00\u90e8\u5206\u5143\u7d20\u6d45\u590d\u5236\u5b58\u5165\u65b0\u7684\u6570\u7ec4\u5bf9\u8c61\uff0c\u5e76\u4e14\u8fd4\u56de\u8fd9\u4e2a\u6570\u7ec4\u5bf9\u8c61\u3002<\/p>\n
                      \u8bed\u6cd5\uff1aarr.slice([start[, end]])<\/code><\/p>\n
                      \u53c2\u6570\u00a0start<\/code>\u00a0\u6307\u5b9a\u590d\u5236\u5f00\u59cb\u4f4d\u7f6e\u7684\u7d22\u5f15\uff0cend<\/code>\u5982\u679c\u6709\u503c\u5219\u8868\u793a\u590d\u5236\u7ed3\u675f\u4f4d\u7f6e\u7684\u7d22\u5f15\uff08\u4e0d\u5305\u62ec\u6b64\u4f4d\u7f6e\uff09\u3002<\/p>\n
                      \u5982\u679c\u00a0start<\/code>\u00a0\u7684\u503c\u4e3a\u8d1f\u6570\uff0c\u5047\u5982\u6570\u7ec4\u957f\u5ea6\u4e3a\u00a0length<\/code>\uff0c\u5219\u8868\u793a\u4ece length+start \u7684\u4f4d\u7f6e\u5f00\u59cb\u590d\u5236\uff0c\u6b64\u65f6\u53c2\u6570 end \u5982\u679c\u6709\u503c\uff0c\u53ea\u80fd\u662f\u6bd4 start \u5927\u7684\u8d1f\u6570\uff0c\u5426\u5219\u5c06\u8fd4\u56de\u7a7a\u6570\u7ec4\u3002<\/p>\n
                      slice\u65b9\u6cd5\u53c2\u6570\u4e3a\u7a7a\u65f6\uff0c\u540cconcat\u65b9\u6cd5\u4e00\u6837\uff0c\u90fd\u662f\u6d45\u590d\u5236\u751f\u6210\u4e00\u4e2a\u65b0\u6570\u7ec4\u3002<\/p>\n
                      var array = [\"one\", \"two\", \"three\",\"four\", \"five\"];\r\nconsole.log(array.slice()); \/\/ [\"one\", \"two\", \"three\",\"four\", \"five\"]\r\nconsole.log(array.slice(2,3)); \/\/ [\"three\"]\r\n<\/code><\/pre>\n
                      \u6d45\u590d\u5236 \u662f\u6307\u5f53\u5bf9\u8c61\u7684\u88ab\u590d\u5236\u65f6\uff0c\u53ea\u662f\u590d\u5236\u4e86\u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u6307\u5411\u7684\u4f9d\u7136\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61\u3002\u4e0b\u9762\u6765\u8bf4\u660eslice\u4e3a\u4ec0\u4e48\u662f\u6d45\u590d\u5236\u3002<\/p>\n
                      var array = [{color:\"yellow\"}, 2, 3];\r\nvar array2 = array.slice(0,1);\r\nconsole.log(array2); \/\/ [{color:\"yellow\"}]\r\narray[0][\"color\"] = \"blue\";\r\nconsole.log(array2); \/\/ [{color:\"bule\"}]\r\n<\/code><\/pre>\n
                      \u7531\u4e8eslice\u662f\u6d45\u590d\u5236\uff0c\u590d\u5236\u5230\u7684\u5bf9\u8c61\u53ea\u662f\u4e00\u4e2a\u5f15\u7528\uff0c\u6539\u53d8\u539f\u6570\u7ec4array\u7684\u503c\uff0carray2\u4e5f\u968f\u4e4b\u6539\u53d8\u3002<\/p>\n
                      \u540c\u65f6\uff0c\u7a0d\u5fae\u5229\u7528\u4e0b slice \u65b9\u6cd5\u7b2c\u4e00\u4e2a\u53c2\u6570\u4e3a\u8d1f\u6570\u65f6\u7684\u7279\u6027\uff0c\u6211\u4eec\u53ef\u4ee5\u975e\u5e38\u65b9\u4fbf\u7684\u62ff\u5230\u6570\u7ec4\u7684\u6700\u540e\u4e00\u9879\u5143\u7d20\uff0c\u5982\u4e0b\uff1a<\/p>\n
                      console.log([1,2,3].slice(-1));\/\/[3]<\/p>\n
                      join \u51fd\u6570<\/h4>\n
                      join() \u65b9\u6cd5\u5c06\u6570\u7ec4\u4e2d\u7684\u6240\u6709\u5143\u7d20\u8fde\u63a5\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002<\/p>\n
                      \u8bed\u6cd5 arr.join('xxx')<\/code><\/p>\n
                      var b = arr.join(','); \/\/ b: '1,2,3'\r\nvar b = arr.join('*'); \/\/ b: '1*2*3'\r\n<\/code><\/pre>\n
                      push \u51fd\u6570<\/h4>\n
                      \u6570\u7ec4\u4e2d\u6dfb\u52a0\u503c\u3002<\/p>\n
                      concat \u51fd\u6570<\/h4>\n
                      concat() \u65b9\u6cd5\u5c06\u4f20\u5165\u7684\u6570\u7ec4\u6216\u8005\u5143\u7d20\u4e0e\u539f\u6570\u7ec4\u5408\u5e76\uff0c\u7ec4\u6210\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4\u5e76\u8fd4\u56de\u3002<\/p>\n
                      indexOf\u51fd\u6570<\/h4>\n
                      indexOf() \u65b9\u6cd5\u7528\u4e8e\u67e5\u627e\u5143\u7d20\u5728\u6570\u7ec4\u4e2d\u7b2c\u4e00\u6b21\u51fa\u73b0\u65f6\u7684\u7d22\u5f15\uff0c\u5982\u679c\u6ca1\u6709\uff0c\u5219\u8fd4\u56de-1\u3002<\/p>\n
                      \u8bed\u6cd5\uff1aarr.indexOf(element, fromIndex=0)<\/code><\/p>\n
                      element \u4e3a\u9700\u8981\u67e5\u627e\u7684\u5143\u7d20\u3002<\/p>\n
                      fromIndex \u4e3a\u5f00\u59cb\u67e5\u627e\u7684\u4f4d\u7f6e\uff0c\u7f3a\u7701\u9ed8\u8ba4\u4e3a0\u3002\u5982\u679c\u8d85\u51fa\u6570\u7ec4\u957f\u5ea6\uff0c\u5219\u8fd4\u56de-1\u3002\u5982\u679c\u4e3a\u8d1f\u503c\uff0c\u5047\u8bbe\u6570\u7ec4\u957f\u5ea6\u4e3alength\uff0c\u5219\u4ece\u6570\u7ec4\u7684\u7b2c length + fromIndex\u9879\u5f00\u59cb\u5f80\u6570\u7ec4\u672b\u5c3e\u67e5\u627e\uff0c\u5982\u679clength + fromIndex<0 \u5219\u6574\u4e2a\u6570\u7ec4\u90fd\u4f1a\u88ab\u67e5\u627e\u3002<\/p>\n
                      indexOf\u4f7f\u7528\u4e25\u683c\u76f8\u7b49\uff08\u5373\u4f7f\u7528 === \u53bb\u5339\u914d\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff09\u3002<\/p>\n
                      var array = ['abc', 'def', 'ghi','123'];\r\nconsole.log(array.indexOf('def')); \/\/ 1\r\nconsole.log(array.indexOf('def',-1)); \/\/ -1 \u6b64\u65f6\u8868\u793a\u4ece\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u5f80\u540e\u67e5\u627e,\u56e0\u6b64\u67e5\u627e\u5931\u8d25\u8fd4\u56de-1\r\nconsole.log(array.indexOf('def',-4)); \/\/ 1 \u7531\u4e8e4\u5927\u4e8e\u6570\u7ec4\u957f\u5ea6,\u6b64\u65f6\u5c06\u67e5\u627e\u6574\u4e2a\u6570\u7ec4,\u56e0\u6b64\u8fd4\u56de1\r\nconsole.log(array.indexOf(123)); \/\/ -1, \u7531\u4e8e\u662f\u4e25\u683c\u5339\u914d,\u56e0\u6b64\u5e76\u4e0d\u4f1a\u5339\u914d\u5230\u5b57\u7b26\u4e32'123'\r\n<\/code><\/pre>\n
                      includes \u51fd\u6570<\/h4>\n
                      includes() \u65b9\u6cd5\u57fa\u4e8eECMAScript 2016\uff08ES7\uff09\u89c4\u8303<\/strong>\uff0c\u5b83\u7528\u6765\u5224\u65ad\u5f53\u524d\u6570\u7ec4\u662f\u5426\u5305\u542b\u67d0\u4e2a\u6307\u5b9a\u7684\u503c\uff0c\u5982\u679c\u662f\uff0c\u5219\u8fd4\u56de true\uff0c\u5426\u5219\u8fd4\u56de false\u3002<\/p>\n
                      \u8bed\u6cd5\uff1aarr.includes(element, fromIndex=0)<\/code><\/p>\n
                      element \u4e3a\u9700\u8981\u67e5\u627e\u7684\u5143\u7d20\u3002<\/p>\n
                      fromIndex \u8868\u793a\u4ece\u8be5\u7d22\u5f15\u4f4d\u7f6e\u5f00\u59cb\u67e5\u627e element\uff0c\u7f3a\u7701\u4e3a0\uff0c\u5b83\u662f\u6b63\u5411\u67e5\u627e\uff0c\u5373\u4ece\u7d22\u5f15\u5904\u5f80\u6570\u7ec4\u672b\u5c3e\u67e5\u627e\u3002<\/p>\n
                      var array = [-0, 1, 2];\r\nconsole.log(array.includes(+0)); \/\/ true\r\nconsole.log(array.includes(1)); \/\/ true\r\nconsole.log(array.includes(2,-4)); \/\/ true\r\n<\/code><\/pre>\n
                      \u4ee5\u4e0a\uff0cincludes\u4f3c\u4e4e\u5ffd\u7565\u4e86 -0 \u4e0e +0 \u7684\u533a\u522b\uff0c\u8fd9\u4e0d\u662f\u95ee\u9898\uff0c\u56e0\u4e3aJavaScript\u4e00\u76f4\u4ee5\u6765\u90fd\u662f\u4e0d\u533a\u5206 -0 \u548c +0 \u7684\u3002<\/p>\n
                      \u4f60\u53ef\u80fd\u4f1a\u95ee\uff0c\u65e2\u7136\u6709\u4e86indexOf\u65b9\u6cd5\uff0c\u4e3a\u4ec0\u4e48\u53c8\u9020\u4e00\u4e2aincludes\u65b9\u6cd5\uff0carr.indexOf(x)>-1\u4e0d\u5c31\u7b49\u4e8earr.includes(x)\uff1f\u770b\u8d77\u6765\u662f\u7684\uff0c\u51e0\u4e4e\u6240\u6709\u7684\u65f6\u5019\u5b83\u4eec\u90fd\u7b49\u540c\uff0c\u552f\u4e00\u7684\u533a\u522b\u5c31\u662fincludes\u80fd\u591f\u53d1\u73b0NaN\uff0c\u800cindexOf\u4e0d\u80fd\u3002<\/p>\n
                      var array = [NaN];\r\nconsole.log(array.includes(NaN)); \/\/ true\r\nconsole.log(arra.indexOf(NaN)>-1); \/\/ false\r\n<\/code><\/pre>\n
                      (\u8fd9\u91cc\u5927\u5bb6\u53ef\u4ee5\u8003\u8651\u4e0b indexOf \u548c includes \u7684\u6548\u7387\u8c01\u9ad8\uff0c\u548c\u5e95\u5c42\u5b9e\u73b0)<\/p>\n
                      \u2605\u6570\u7ec4\u51fd\u6570\u6709\u5f88\u591a\uff0c\u4e0a\u9762\u53ea\u5217\u4e3e\u4e86\u5e38\u7528\u7684\u51e0\u4e2a\uff0c\u53d1\u73b0\u4e00\u7bc7\u5f88\u5168\u7684\u6570\u7ec4\u51fd\u6570\u6587\u7ae0\uff0c\u975e\u5e38\u68d2\uff0c\u611f\u8c22\u4f5c\u8005\u5206\u4eab\uff0c\u63a8\u8350\u7ed9\u5927\u5bb6\uff1ahttp:\/\/louiszhai.github.io\/2017\/04\/28\/array\/<\/p>\n
                      \u201d<\/p><\/blockquote>\n
                      5.2 \u5b57\u7b26\u4e32\u5e38\u7528\u51fd\u6570<\/h3>\n
                      split \u51fd\u6570<\/h4>\n
                        \n
                      • \n
                        \u628a\u5b57\u7b26\u4e32\u5206\u5272\u79f0\u6570\u7ec4<\/section>\n<\/li>\n
                      • \n
                        \u4e0d\u6539\u53d8\u539f\u59cb\u5b57\u7b26\u4e32<\/section>\n<\/li>\n<\/ul>\n
                        string.split(separator,limit)\r\n<\/code><\/pre>\n
                        substr \u51fd\u6570<\/h4>\n
                        substr() \u65b9\u6cd5\u8fd4\u56de\u5b57\u7b26\u4e32\u6307\u5b9a\u4f4d\u7f6e\u5f00\u59cb\u7684\u6307\u5b9a\u6570\u91cf\u7684\u5b57\u7b26\u3002<\/p>\n
                        \u8bed\u6cd5\uff1astr.substr(start[, length])<\/code><\/p>\n
                        start \u8868\u793a\u5f00\u59cb\u622a\u53d6\u5b57\u7b26\u7684\u4f4d\u7f6e\uff0c\u53ef\u53d6\u6b63\u503c\u6216\u8d1f\u503c\u3002\u53d6\u6b63\u503c\u65f6\u8868\u793astart\u4f4d\u7f6e\u7684\u7d22\u5f15\uff0c\u53d6\u8d1f\u503c\u65f6\u8868\u793a length+start\u4f4d\u7f6e\u7684\u7d22\u5f15\u3002<\/p>\n
                        length \u8868\u793a\u622a\u53d6\u7684\u5b57\u7b26\u957f\u5ea6\u3002<\/p>\n
                        var str = \"Yesterday is history. Tomorrow is mystery. But today is a gift.\";\r\nconsole.log(str.substr(47)); \/\/ today is a gift.\r\nconsole.log(str.substr(-16)); \/\/ today is a gift.\r\n<\/code><\/pre>\n
                        \u2605\u6570\u7ec4\u51fd\u6570\u6709\u5f88\u591a\uff0c\u4e0a\u9762\u53ea\u5217\u4e3e\u4e86\u5e38\u7528\u7684\u51e0\u4e2a\uff0c\u53d1\u73b0\u4e00\u7bc7\u5f88\u5168\u7684\u5b57\u7b26\u4e32\u51fd\u6570\u6587\u7ae0\uff0c\u975e\u5e38\u68d2\uff0c\u611f\u8c22\u4f5c\u8005\u5206\u4eab\uff0c\u63a8\u8350\u7ed9\u5927\u5bb6\uff1ahttp:\/\/louiszhai.github.io\/2016\/01\/12\/js.String\/#substr<\/p>\n
                        \u201d<\/p><\/blockquote>\n
                        5.3 \u5bf9\u8c61\u7684\u5e38\u7528\u51fd\u6570<\/h3>\n
                        Object.prototype.hasOwnProperty(prop)<\/h4>\n
                        \u8be5\u65b9\u6cd5\u4ec5\u5728\u76ee\u6807\u5c5e\u6027\u4e3a\u5bf9\u8c61\u81ea\u8eab\u5c5e\u6027\u65f6\u8fd4\u56detrue,\u800c\u5f53\u8be5\u5c5e\u6027\u662f\u4ece\u539f\u578b\u94fe\u4e2d\u7ee7\u627f\u800c\u6765\u6216\u6839\u672c\u4e0d\u5b58\u5728\u65f6\uff0c\u8fd4\u56defalse\u3002<\/p>\n
                        var o = {prop:1};\r\no.hasOwnProperty('prop'); \/\/ true\r\no.hasOwnProperty('toString'); \/\/ false\r\no.hasOwnProperty('formString'); \/\/ false\r\n<\/code><\/pre>\n
                        Object.create(obj, descr) (ES5)<\/h4>\n
                        \u8be5\u65b9\u6cd5\u4e3b\u8981\u7528\u4e8e\u521b\u5efa\u4e00\u4e2a\u65b0\u5bf9\u8c61\uff0c\u5e76\u4e3a\u5176\u8bbe\u7f6e\u539f\u578b\uff0c\u7528\uff08\u4e0a\u8ff0\uff09\u5c5e\u6027\u63cf\u8ff0\u7b26\u6765\u5b9a\u4e49\u5bf9\u8c61\u7684\u539f\u578b\u5c5e\u6027\u3002<\/p>\n
                        var parent = {hi: 'Hello'};\r\nvar o = Object.create(parent, {\r\n    prop: {\r\n        value: 1\r\n    }\r\n});\r\no.hi; \/\/ 'Hello'\r\n\/\/ \u83b7\u5f97\u5b83\u7684\u539f\u578b\r\nObject.getPrototypeOf(parent) === Object.prototype; \/\/ true \u8bf4\u660eparent\u7684\u539f\u578b\u662fObject.prototype\r\nObject.getPrototypeOf(o); \/\/ {hi: \"Hello\"} \/\/ \u8bf4\u660eo\u7684\u539f\u578b\u662f{hi: \"Hello\"}\r\no.hasOwnProperty('hi'); \/\/ false \u8bf4\u660ehi\u662f\u539f\u578b\u4e0a\u7684\r\no.hasOwnProperty('prop'); \/\/ true \u8bf4\u660eprop\u662f\u539f\u578b\u4e0a\u7684\u81ea\u8eab\u4e0a\u7684\u5c5e\u6027\u3002\r\n<\/code><\/pre>\n
                        \u73b0\u5728\uff0c\u6211\u4eec\u751a\u81f3\u53ef\u4ee5\u7528\u5b83\u6765\u521b\u5efa\u4e00\u4e2a\u5b8c\u5168\u7a7a\u767d\u7684\u5bf9\u8c61\uff0c\u8fd9\u6837\u7684\u4e8b\u60c5\u5728ES3\u4e2d\u53ef\u662f\u505a\u4e0d\u5230\u7684\u3002<\/p>\n
                        var o = Object.create(null);\r\ntypeof o.toString(); \/\/ 'undefined'\r\n<\/code><\/pre>\n
                        \u2605\u6570\u7ec4\u51fd\u6570\u6709\u5f88\u591a\uff0c\u4e0a\u9762\u53ea\u5217\u4e3e\u4e86\u5e38\u7528\u7684\u51e0\u4e2a\uff0c\u53d1\u73b0\u4e00\u7bc7\u5f88\u5168\u7684\u5bf9\u8c61\u51fd\u6570\u6587\u7ae0\uff0c\u975e\u5e38\u68d2\uff0c\u611f\u8c22\u4f5c\u8005\u5206\u4eab\uff0c\u63a8\u8350\u7ed9\u5927\u5bb6\uff1ahttps:\/\/www.lxchuan12.cn\/js-object-api<\/p>\n
                        \u201d<\/p><\/blockquote>\n
                        6. \u5e38\u7528\u7279\u6b8a\u8bf4\u660e<\/h2>\n
                        6.1 arguments \u7c7b\u4f3c\u6570\u7ec4\u5bf9\u8c61<\/h3>\n
                        \u4ec0\u4e48\u662f\u7c7b\u4f3c\u6570\u7ec4\u5bf9\u8c61\uff0c\u4e3e\u4e2a\u4f8b\u5b50:<\/p>\n
                        let arrayLike = {\r\n    '0': 'a',\r\n    '1': 'b',\r\n    '2': 'c',\r\n    length: 3\r\n};\r\n<\/code><\/pre>\n
                        \u7c7b\u6570\u7ec4\u8f6c\u6362\u7684\u51e0\u79cd\u65b9\u5f0f<\/p>\n
                          \n
                        • \n
                          ES6 \u6269\u5c55\u8fd0\u7b97\u7b26\u8fdb\u884c\u8f6c\u6362<\/p>\n
                          var arr1 = [...arrayLike]; \/\/ ['a','b','c']\r\n<\/code><\/pre>\n<\/section>\n<\/li>\n
                        • \n
                          ES6 \u4e2d\u7684 Array.from<\/p>\n
                          let arr2 = Array.from(arrayLike); \/\/ ['a', 'b', 'c']\r\n<\/code><\/pre>\n
                          Array.from()<\/code>\u00a0\u7684\u53e6\u4e00\u4e2a\u5e94\u7528\u662f\uff0c\u5c06\u5b57\u7b26\u4e32\u8f6c\u4e3a\u6570\u7ec4\uff0c\u7136\u540e\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002<\/p>\n
                          function countSymbols(string) {\r\n  returnArray.from(string).length;\r\n}\r\n<\/code><\/pre>\n<\/section>\n<\/li>\n
                        • \n
                          ES5\u4e2d Array.prototype.slice.call()<\/p>\n
                          function test(a,b,c,d)\r\n   {\r\n      var arg = Array.prototype.slice.call(arguments,1);\r\n      alert(arg);\r\n   }\r\n   test(\"a\",\"b\",\"c\",\"d\"); \/\/b,c,d\r\n<\/code><\/pre>\n
                          Array.prototype.slice.call(arguments)<\/code>\u80fd\u5c06\u5177\u6709length<\/code>\u5c5e\u6027\u7684\u5bf9\u8c61\u8f6c\u6210\u6570\u7ec4\uff0c\u9664\u4e86IE<\/code>\u4e0b\u7684\u8282\u70b9\u96c6\u5408\uff08\u56e0\u4e3aie\u4e0b\u7684dom\u5bf9\u8c61\u662f\u4ee5com\u5bf9\u8c61\u7684\u5f62\u5f0f\u5b9e\u73b0\u7684\uff0cjs\u5bf9\u8c61\u4e0ecom\u5bf9\u8c61\u4e0d\u80fd\u8fdb\u884c\u8f6c\u6362\uff09<\/p>\n<\/section>\n
                            \n
                          • \n
                            \u7b2c\u4e00\u4e2a\u53c2\u6570\u662fcontext\uff08\u5c31\u662f\u4e0a\u4e0b\u6587\u7684\u610f\u601d\uff09\uff0c\u7528\u6765\u66ff\u6362\u5bf9\u8c61\u51fd\u6570\u4e2d\u7684this<\/section>\n<\/li>\n
                          • \n
                            \u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u4f20\u9012\u7ed9\u5bf9\u8c61\u51fd\u6570\u7684\u53c2\u6570<\/section>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                            6.2 \u9ad8\u9636\u51fd\u6570\u4f7f\u7528<\/h3>\n
                            \u9ad8\u9636\u51fd\u6570\u76f8\u5173\u5185\u5bb9\u53ef\u4ee5\u770b\u8fd9\u7bc7\u6587\u7ae0\u3002\u3010JS\u5fc5\u77e5\u5fc5\u4f1a\u3011\u9ad8\u9636\u51fd\u6570\u8be6\u89e3\u4e0e\u5b9e\u6218<\/p>\n
                            \u5728\u5b9e\u73b0\u65e0\u9650\u53e0\u52a0\uff0c\u6570\u7ec4\u62cd\u5e73\uff0c\u53bb\u91cd\u7b49\u90fd\u53ef\u4ee5\u7528\u5230\u9ad8\u9636\u51fd\u6570\u3002<\/p>\n
                            7. \u5411\u9762\u8bd5\u5b98\u8bc1\u660e ES6 \u4e5f\u4f1a<\/h2>\n
                            \u8ba9\u4f60\u624b\u5199\u4ee3\u7801\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u8003\u8651\u4e00\u4e0b\u4f7f\u7528 ES6 \u65b9\u5f0f\u5982\u4f55\u7b80\u6d01\u5b9e\u73b0\u3002(\u8fd9\u91cc\u5927\u5bb6\u53ef\u4ee5\u53bb\u770b\u4e00\u4e0bES6\u7684\u6269\u5c55\u8fd0\u7b97\u7b26…\uff0cset\u96c6\u5408,\u7bad\u5934\u51fd\u6570\u7b49\u5e38\u7528\u7684ES6\u77e5\u8bc6\u70b9\uff0c\u9644\u4e0aES6\u962e\u4e00\u5cf0\u8001\u5e08\u4e66\u7c4d\u5b66\u4e60\u5730\u5740\uff1ahttp:\/\/es6.ruanyifeng.com\/)<\/p>\n
                            8. \u7ec3\u4e60\u4e00\u4e0b<\/h2>\n
                            Node.js \u4e2d\u6709\u4e00\u4e2aqueryString\u6a21\u5757\uff0c\u53ef\u4ee5\u5b9e\u73b0\u5c06 urlStr \u4e3b\u673a\u5730\u5740\u540e\u9762\u7684\u53c2\u6570\u8f6c\u5316\u4e3a\u5bf9\u8c61\u3002<\/p>\n
                            let urlStr = 'http:\/\/www.inode.club?name=koala&study=js&study=node';\r\n<\/code><\/pre>\n
                            \u8f6c\u6362\u7ed3\u679c\u5982\u4e0b:<\/p>\n
                            { name: 'koala', study: [ 'js', 'node' ] }\r\n<\/code><\/pre>\n
                            \u4ee3\u7801\u5b9e\u73b0<\/h3>\n
                            \u4f60\u53ef\u4ee5\u73b0\u81ea\u5df1\u5b9e\u73b0\u4e00\u4e0b\uff0c\u770b\u5b8c\u672c\u7bc7\u60f3\u4e00\u4e0b\u6d41\u7a0b<\/p>\n
                            let urlStr = 'http:\/\/www.inode.club?name=koala&study=js&study=node'\r\n\/\/ \u53c2\u6570\u8f6c\u6210\u5bf9\u8c61\r\nfunction queryString(request){\r\n    let params = request.split('?')[1];\r\n    let param = params.split('&');\r\n    let obj = {};\r\n    for (let i = 0;i<param.length;i++){\r\n        let paramsA = param[i].split('=');\r\n        let key = paramsA[0];\r\n        let value = paramsA[1];\r\n        if(obj[key]){\r\n            obj[key] = Array.isArray(obj[key])?obj[key]:[obj[key]];\r\n            obj[key].push(value);\r\n        }else{\r\n            obj[key] = value;\r\n        }\r\n    }\r\n    return obj;\r\n}\r\nconsole.log(queryString(urlStr));\r\n<\/code><\/pre>\n
                            \u603b\u7ed3<\/h2>\n
                            \u672c\u6587\u662f\u4e00\u4e2a\u5e94\u5bf9\u624b\u5199\u4ee3\u7801\u7684\u5b66\u4e60\u5927\u7eb2\uff0c\u4e00\u4e9b\u51fd\u6570\u5e76\u6ca1\u6709\u5168\u90e8\u5217\u5168\uff0c\u4f46\u662f\u5927\u5bb6\u6709\u65f6\u95f4\u6309\u7167\u5927\u7eb2\u590d\u4e60\u4e00\u904d\uff0c\u518d\u53bb\u770b\u4e00\u4e9b\u5e38\u8003\u7684\u624b\u5199\u4ee3\u7801\u95ee\u9898\uff0c\u4e2a\u4eba\u611f\u89c9\u80fd\u597d\u8bb0\u800c\u4e14\u6e05\u6670\u4e86\u5f88\u591a\uff0c\u5e0c\u671b\u672c\u6587\u80fd\u5bf9\u5927\u5bb6\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                            \u524d\u8a00 \u6211\u4eec\u5728\u9762\u8bd5\u7684\u65f6\u5019\uff0c\u7ecf\u5e38\u4f1a\u88ab\u9762\u8bd5\u5b98\u95ee\u5230\u51e0\u4e2a\u624b\u5199\u4ee3\u7801\u7684\u95ee\u9898\u3002\u624b\u5199\u4e00\u4e2a\u6570\u7ec4\u53bb\u91cd\u590d\uff0c\u6df1\u62f7\u8d1d\uff0c\u6570\u7ec4\u62cd\u5e73\u7b49\u7b49\u3002\u6709\u4e9b\u5c0f […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"_links":{"self":[{"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/posts\/220"}],"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=220"}],"version-history":[{"count":2,"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/posts\/220\/revisions"}],"predecessor-version":[{"id":222,"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/posts\/220\/revisions\/222"}],"wp:attachment":[{"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/media?parent=220"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/categories?post=220"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/adeqing.com\/index.php\/wp-json\/wp\/v2\/tags?post=220"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}