{"id":1380,"date":"2024-06-02T22:29:26","date_gmt":"2024-06-02T22:29:26","guid":{"rendered":""},"modified":"2024-06-05T03:09:46","modified_gmt":"2024-06-04T19:09:46","slug":"javascript%e4%b8%93%e9%a2%98%e4%b9%8b%e7%b1%bb%e5%9e%8b%e5%88%a4%e6%96%ad%e4%b8%8a","status":"publish","type":"post","link":"https:\/\/www.lccc.top\/?p=1380","title":{"rendered":"JavaScript\u4e13\u9898\u4e4b\u7c7b\u578b\u5224\u65ad(\u4e0a)"},"content":{"rendered":"\n

\u524d\u8a00<\/h2>\n

\u7c7b\u578b\u5224\u65ad\u5728 web \u5f00\u53d1\u4e2d\u6709\u975e\u5e38\u5e7f\u6cdb\u7684\u5e94\u7528\uff0c\u7b80\u5355\u7684\u6709\u5224\u65ad\u6570\u5b57\u8fd8\u662f\u5b57\u7b26\u4e32\uff0c\u8fdb\u9636\u4e00\u70b9\u7684\u6709\u5224\u65ad\u6570\u7ec4\u8fd8\u662f\u5bf9\u8c61\uff0c\u518d\u8fdb\u9636\u4e00\u70b9\u7684\u6709\u5224\u65ad\u65e5\u671f\u3001\u6b63\u5219\u3001\u9519\u8bef\u7c7b\u578b\uff0c\u518d\u518d\u8fdb\u9636\u4e00\u70b9\u8fd8\u6709\u6bd4\u5982\u5224\u65ad plainObject\u3001\u7a7a\u5bf9\u8c61\u3001Window \u5bf9\u8c61\u7b49\u7b49\u3002<\/p>\n

\u4ee5\u4e0a\u90fd\u4f1a\u8bb2\uff0c\u4eca\u5929\u662f\u4e0a\u534a\u573a\u3002<\/p>\n

typeof<\/h2>\n

\u6211\u4eec\u6700\u6700\u5e38\u7528\u7684\u83ab\u8fc7\u4e8e typeof\uff0c\u6ce8\u610f\uff0c\u5c3d\u7ba1\u6211\u4eec\u4f1a\u770b\u5230\u8bf8\u5982\uff1a<\/p>\n

\n
console<\/span>.<\/span>log<\/span>(<\/span>typeof<\/span>(<\/span>'yayu'<\/span>)<\/span>)<\/span> \/\/ string<\/span><\/pre>\n<\/div>\n
\u7684\u5199\u6cd5\uff0c\u4f46\u662f typeof \u53ef\u662f\u4e00\u4e2a\u6b63\u5b97\u7684\u8fd0\u7b97\u7b26\uff0c\u5c31\u8ddf\u52a0\u51cf\u4e58\u9664\u4e00\u6837\uff01\u8fd9\u5c31\u80fd\u89e3\u91ca\u4e3a\u4ec0\u4e48\u4e0b\u9762\u8fd9\u79cd\u5199\u6cd5\u4e5f\u662f\u53ef\u884c\u7684\uff1a<\/p>\n
\n
console<\/span>.<\/span>log<\/span>(<\/span>typeof<\/span> 'yayu'<\/span>)<\/span> \/\/ string<\/span><\/pre>\n<\/div>\n
\u5f15\u7528\u300aJavaScript\u6743\u5a01\u6307\u5357\u300b\u4e2d\u5bf9 typeof \u7684\u4ecb\u7ecd\uff1a<\/p>\n
\n
typeof \u662f\u4e00\u5143\u64cd\u4f5c\u7b26\uff0c\u653e\u5728\u5176\u5355\u4e2a\u64cd\u4f5c\u6570\u7684\u524d\u9762\uff0c\u64cd\u4f5c\u6570\u53ef\u4ee5\u662f\u4efb\u610f\u7c7b\u578b\u3002\u8fd4\u56de\u503c\u4e3a\u8868\u793a\u64cd\u4f5c\u6570\u7c7b\u578b\u7684\u4e00\u4e2a\u5b57\u7b26\u4e32\u3002<\/p>\n<\/blockquote>\n
\u90a3\u6211\u4eec\u90fd\u77e5\u9053\uff0c\u5728 ES6 \u524d\uff0cJavaScript \u5171\u516d\u79cd\u6570\u636e\u7c7b\u578b\uff0c\u5206\u522b\u662f\uff1a<\/p>\n
Undefined\u3001Null\u3001Boolean\u3001Number\u3001String\u3001Object<\/p>\n
\u7136\u800c\u5f53\u6211\u4eec\u4f7f\u7528 typeof \u5bf9\u8fd9\u4e9b\u6570\u636e\u7c7b\u578b\u7684\u503c\u8fdb\u884c\u64cd\u4f5c\u7684\u65f6\u5019\uff0c\u8fd4\u56de\u7684\u7ed3\u679c\u5374\u4e0d\u662f\u4e00\u4e00\u5bf9\u5e94\uff0c\u5206\u522b\u662f\uff1a<\/p>\n
undefined\u3001object\u3001boolean\u3001number\u3001string\u3001object<\/p>\n
\u6ce8\u610f\u4ee5\u4e0a\u90fd\u662f\u5c0f\u5199\u7684\u5b57\u7b26\u4e32\u3002Null \u548c Object \u7c7b\u578b\u90fd\u8fd4\u56de\u4e86 object \u5b57\u7b26\u4e32\u3002<\/p>\n
\u5c3d\u7ba1\u4e0d\u80fd\u4e00\u4e00\u5bf9\u5e94\uff0c\u4f46\u662f typeof \u5374\u80fd\u68c0\u6d4b\u51fa\u51fd\u6570\u7c7b\u578b\uff1a<\/p>\n
<\/p>\n
function<\/span> a<\/span>(<\/span>)<\/span> {<\/span>}<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>typeof<\/span> a<\/span>)<\/span>;<\/span> \/\/ function<\/span><\/pre>\n<\/div>\n
\u6240\u4ee5 typeof \u80fd\u68c0\u6d4b\u51fa\u516d\u79cd\u7c7b\u578b\u7684\u503c\uff0c\u4f46\u662f\uff0c\u9664\u6b64\u4e4b\u5916 Object \u4e0b\u8fd8\u6709\u5f88\u591a\u7ec6\u5206\u7684\u7c7b\u578b\u5450\uff0c\u5982 Array\u3001Function\u3001Date\u3001RegExp\u3001Error \u7b49\u3002<\/p>\n
\u5982\u679c\u7528 typeof \u53bb\u68c0\u6d4b\u8fd9\u4e9b\u7c7b\u578b\uff0c\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
<\/p>\n
var<\/span> date<\/span> =<\/span> new<\/span> Date<\/span>(<\/span>)<\/span>;<\/span>\nvar<\/span> error<\/span> =<\/span> new<\/span> Error<\/span>(<\/span>)<\/span>;<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>typeof<\/span> date<\/span>)<\/span>;<\/span> \/\/ object<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>typeof<\/span> error<\/span>)<\/span>;<\/span> \/\/ object<\/span><\/pre>\n<\/div>\n
\u8fd4\u56de\u7684\u90fd\u662f object \u5450\uff0c\u8fd9\u53ef\u600e\u4e48\u533a\u5206~ \u6240\u4ee5\u6709\u6ca1\u6709\u66f4\u597d\u7684\u65b9\u6cd5\u5462\uff1f<\/p>\n
Object.prototype.toString<\/h2>\n
\u662f\u7684\uff0c\u5f53\u7136\u6709\uff01\u8fd9\u5c31\u662f Object.prototype.toString\uff01<\/p>\n
\u90a3 Object.protototype.toString \u7a76\u7adf\u662f\u4e00\u4e2a\u4ec0\u4e48\u6837\u7684\u65b9\u6cd5\u5462\uff1f<\/p>\n
\u4e3a\u4e86\u66f4\u52a0\u7ec6\u81f4\u7684\u8bb2\u89e3\u8fd9\u4e2a\u51fd\u6570\uff0c\u8ba9\u6211\u5148\u732e\u4e0a ES5 \u89c4\u8303\u5730\u5740\uff1ahttps:\/\/es5.github.io\/#x15.2.4.2<\/a>\u3002<\/p>\n
\u5728\u7b2c 15.2.4.2 \u8282\u8bb2\u7684\u5c31\u662f Object.prototype.toString()\uff0c\u4e3a\u4e86\u4e0d\u8bef\u5bfc\u5927\u5bb6\uff0c\u6211\u5148\u5949\u4e0a\u82f1\u6587\u7248\uff1a<\/p>\n
\n
When the toString method is called, the following steps are taken:<\/p>\n<\/blockquote>\n
\n
    \n
  1. If the this<\/strong> value is undefined<\/strong>, return “[object Undefined]<\/strong>“.<\/li>\n
  2. If the this<\/strong> value is null<\/strong>, return “[object Null]<\/strong>“.<\/li>\n
  3. Let O<\/em> be the result of calling ToObject passing the this<\/strong> value as the argument.<\/li>\n
  4. Let class<\/em> be the value of the [[Class]] internal property of O<\/em>.<\/li>\n
  5. Return the String value that is the result of concatenating the three Strings “[object<\/strong> “, class<\/em>, and “]<\/strong>“.<\/li>\n<\/ol>\n<\/blockquote>\n
    \u51e1\u662f\u89c4\u8303\u4e0a\u52a0\u7c97\u6216\u8005\u659c\u4f53\u7684\uff0c\u5728\u8fd9\u91cc\u6211\u4e5f\u52a0\u7c97\u6216\u8005\u659c\u4f53\u4e86\uff0c\u5c31\u662f\u8981\u8ba9\u5927\u5bb6\u611f\u53d7\u539f\u6c41\u539f\u5473\u7684\u89c4\u8303\uff01<\/p>\n
    \u5982\u679c\u6ca1\u6709\u770b\u61c2\uff0c\u5c31\u4e0d\u59a8\u770b\u770b\u6211\u7406\u89e3\u7684\uff1a<\/p>\n
    \u5f53 toString \u65b9\u6cd5\u88ab\u8c03\u7528\u7684\u65f6\u5019\uff0c\u4e0b\u9762\u7684\u6b65\u9aa4\u4f1a\u88ab\u6267\u884c\uff1a<\/p>\n
      \n
    1. \u5982\u679c this \u503c\u662f undefined\uff0c\u5c31\u8fd4\u56de [object Undefined]<\/li>\n
    2. \u5982\u679c this \u7684\u503c\u662f null\uff0c\u5c31\u8fd4\u56de [object Null]<\/li>\n
    3. \u8ba9 O \u6210\u4e3a ToObject(this) \u7684\u7ed3\u679c<\/li>\n
    4. \u8ba9 class \u6210\u4e3a O \u7684\u5185\u90e8\u5c5e\u6027 [[Class]] \u7684\u503c<\/li>\n
    5. \u6700\u540e\u8fd4\u56de\u7531 “[object ” \u548c class \u548c “]” \u4e09\u4e2a\u90e8\u5206\u7ec4\u6210\u7684\u5b57\u7b26\u4e32<\/li>\n<\/ol>\n
      \u901a\u8fc7\u89c4\u8303\uff0c\u6211\u4eec\u81f3\u5c11\u77e5\u9053\u4e86\u8c03\u7528 Object.prototype.toString \u4f1a\u8fd4\u56de\u4e00\u4e2a\u7531 “[object ” \u548c class \u548c “]” \u7ec4\u6210\u7684\u5b57\u7b26\u4e32\uff0c\u800c class \u662f\u8981\u5224\u65ad\u7684\u5bf9\u8c61\u7684\u5185\u90e8\u5c5e\u6027\u3002<\/p>\n
      \u8ba9\u6211\u4eec\u5199\u4e2a demo:<\/p>\n
      <\/p>\n
      console<\/span>.<\/span>log<\/span>(<\/span>Object<\/span>.<\/span>prototype<\/span>.<\/span>toString<\/span>.<\/span>call<\/span>(<\/span>undefined<\/span>)<\/span>)<\/span> \/\/ [object Undefined]<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>Object<\/span>.<\/span>prototype<\/span>.<\/span>toString<\/span>.<\/span>call<\/span>(<\/span>null<\/span>)<\/span>)<\/span> \/\/ [object Null]<\/span>\n\nvar<\/span> date<\/span> =<\/span> new<\/span> Date<\/span>(<\/span>)<\/span>;<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>Object<\/span>.<\/span>prototype<\/span>.<\/span>toString<\/span>.<\/span>call<\/span>(<\/span>date<\/span>)<\/span>)<\/span> \/\/ [object Date]<\/span><\/pre>\n<\/div>\n
      \u7531\u6b64\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u8fd9\u4e2a class \u503c\u5c31\u662f\u8bc6\u522b\u5bf9\u8c61\u7c7b\u578b\u7684\u5173\u952e\uff01<\/p>\n
      \u6b63\u662f\u56e0\u4e3a\u8fd9\u79cd\u7279\u6027\uff0c\u6211\u4eec\u53ef\u4ee5\u7528 Object.prototype.toString \u65b9\u6cd5\u8bc6\u522b\u51fa\u66f4\u591a\u7c7b\u578b\uff01<\/p>\n
      \u90a3\u5230\u5e95\u80fd\u8bc6\u522b\u591a\u5c11\u79cd\u7c7b\u578b\u5462\uff1f<\/p>\n
      \u81f3\u5c11 12 \u79cd\uff01<\/p>\n
      \u4f60\u548b\u77e5\u9053\u7684\uff1f<\/p>\n
      \u6211\u6570\u7684\uff01<\/p>\n
      \u2026\u2026<\/p>\n
      \u8ba9\u6211\u4eec\u770b\u4e2a demo:<\/p>\n
      <\/p>\n
      \/\/ \u4ee5\u4e0b\u662f11\u79cd\uff1a<\/span>\nvar<\/span> number<\/span> =<\/span> 1<\/span>;<\/span>          \/\/ [object Number]<\/span>\nvar<\/span> string<\/span> =<\/span> '123'<\/span>;<\/span>      \/\/ [object String]<\/span>\nvar<\/span> boolean<\/span> =<\/span> true<\/span>;<\/span>      \/\/ [object Boolean]<\/span>\nvar<\/span> und<\/span> =<\/span> undefined<\/span>;<\/span>     \/\/ [object Undefined]<\/span>\nvar<\/span> nul<\/span> =<\/span> null<\/span>;<\/span>          \/\/ [object Null]<\/span>\nvar<\/span> obj<\/span> =<\/span> {<\/span>a<\/span>: 1<\/span>}<\/span>         \/\/ [object Object]<\/span>\nvar<\/span> array<\/span> =<\/span> [<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>]<\/span>;<\/span>   \/\/ [object Array]<\/span>\nvar<\/span> date<\/span> =<\/span> new<\/span> Date<\/span>(<\/span>)<\/span>;<\/span>   \/\/ [object Date]<\/span>\nvar<\/span> error<\/span> =<\/span> new<\/span> Error<\/span>(<\/span>)<\/span>;<\/span> \/\/ [object Error]<\/span>\nvar<\/span> reg<\/span> =<\/span> \/<\/span>a\/<\/span>g<\/span>;<\/span>          \/\/ [object RegExp]<\/span>\nvar<\/span> func<\/span> =<\/span> function<\/span> a<\/span>(<\/span>)<\/span>{<\/span>}<\/span>;<\/span> \/\/ [object Function]<\/span>\n\nfunction<\/span> checkType<\/span>(<\/span>)<\/span> {<\/span>\n    for<\/span> (<\/span>var<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> arguments<\/span>.<\/span>length<\/span>;<\/span> i<\/span>++<\/span>)<\/span> {<\/span>\n        console<\/span>.<\/span>log<\/span>(<\/span>Object<\/span>.<\/span>prototype<\/span>.<\/span>toString<\/span>.<\/span>call<\/span>(<\/span>arguments<\/span>[<\/span>i<\/span>]<\/span>)<\/span>)<\/span>\n    }<\/span>\n}<\/span>\n\ncheckType<\/span>(<\/span>number<\/span>,<\/span> string<\/span>,<\/span> boolean<\/span>,<\/span> und<\/span>,<\/span> nul<\/span>,<\/span> obj<\/span>,<\/span> array<\/span>,<\/span> date<\/span>,<\/span> error<\/span>,<\/span> reg<\/span>,<\/span> func<\/span>)<\/span><\/pre>\n<\/div>\n
      \u9664\u4e86\u4ee5\u4e0a 11 \u79cd\u4e4b\u5916\uff0c\u8fd8\u6709\uff1a<\/p>\n
      <\/p>\n
      console<\/span>.<\/span>log<\/span>(<\/span>Object<\/span>.<\/span>prototype<\/span>.<\/span>toString<\/span>.<\/span>call<\/span>(<\/span>Math<\/span>)<\/span>)<\/span>;<\/span> \/\/ [object Math]<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>Object<\/span>.<\/span>prototype<\/span>.<\/span>toString<\/span>.<\/span>call<\/span>(<\/span>JSON<\/span>)<\/span>)<\/span>;<\/span> \/\/ [object JSON]<\/span><\/pre>\n<\/div>\n
      \u9664\u4e86\u4ee5\u4e0a 13 \u79cd\u4e4b\u5916\uff0c\u8fd8\u6709\uff1a<\/p>\n
      <\/p>\n
      function<\/span> a<\/span>(<\/span>)<\/span> {<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>Object<\/span>.<\/span>prototype<\/span>.<\/span>toString<\/span>.<\/span>call<\/span>(<\/span>arguments<\/span>)<\/span>)<\/span>;<\/span> \/\/ [object Arguments]<\/span>\n}<\/span>\na<\/span>(<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
      \u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u8bc6\u522b\u81f3\u5c11 14 \u79cd\u7c7b\u578b\uff0c\u5f53\u7136\u6211\u4eec\u4e5f\u53ef\u4ee5\u7b97\u51fa\u6765\uff0c[[class]] \u5c5e\u6027\u81f3\u5c11\u6709 12 \u4e2a\u3002<\/p>\n
      type API<\/h2>\n
      \u65e2\u7136\u6709\u4e86 Object.prototype.toString \u8fd9\u4e2a\u795e\u5668\uff01\u90a3\u5c31\u8ba9\u6211\u4eec\u5199\u4e2a type \u51fd\u6570\u5e2e\u52a9\u6211\u4eec\u4ee5\u540e\u8bc6\u522b\u5404\u79cd\u7c7b\u578b\u7684\u503c\u5427\uff01<\/p>\n
      \u6211\u7684\u8bbe\u60f3\uff1a<\/p>\n
      \u5199\u4e00\u4e2a type \u51fd\u6570\u80fd\u68c0\u6d4b\u5404\u79cd\u7c7b\u578b\u7684\u503c\uff0c\u5982\u679c\u662f\u57fa\u672c\u7c7b\u578b\uff0c\u5c31\u4f7f\u7528 typeof\uff0c\u5f15\u7528\u7c7b\u578b\u5c31\u4f7f\u7528 toString\u3002\u6b64\u5916\u9274\u4e8e typeof \u7684\u7ed3\u679c\u662f\u5c0f\u5199\uff0c\u6211\u4e5f\u5e0c\u671b\u6240\u6709\u7684\u7ed3\u679c\u90fd\u662f\u5c0f\u5199\u3002<\/p>\n
      \u8003\u8651\u5230\u5b9e\u9645\u60c5\u51b5\u4e0b\u5e76\u4e0d\u4f1a\u68c0\u6d4b Math \u548c JSON\uff0c\u6240\u4ee5\u53bb\u6389\u8fd9\u4e24\u4e2a\u7c7b\u578b\u7684\u68c0\u6d4b\u3002<\/p>\n
      \u6211\u4eec\u6765\u5199\u4e00\u7248\u4ee3\u7801\uff1a<\/p>\n
      <\/p>\n
      \/\/ \u7b2c\u4e00\u7248<\/span>\nvar<\/span> class2type<\/span> =<\/span> {<\/span>}<\/span>;<\/span>\n\n\/\/ \u751f\u6210class2type\u6620\u5c04<\/span>\n\"Boolean Number String Function Array Date RegExp Object Error Null Undefined\"<\/span>.<\/span>split<\/span>(<\/span>\" \"<\/span>)<\/span>.<\/span>map<\/span>(<\/span>function<\/span>(<\/span>item<\/span>,<\/span> index<\/span>)<\/span> {<\/span>\n    class2type<\/span>[<\/span>\"[object \"<\/span> +<\/span> item<\/span> +<\/span> \"]\"<\/span>]<\/span> =<\/span> item<\/span>.<\/span>toLowerCase<\/span>(<\/span>)<\/span>;<\/span>\n}<\/span>)<\/span>\n\nfunction<\/span> type<\/span>(<\/span>obj<\/span>)<\/span> {<\/span>\n    return<\/span> typeof<\/span> obj<\/span> ===<\/span> \"object\"<\/span> ||<\/span> typeof<\/span> obj<\/span> ===<\/span> \"function\"<\/span> ?\n        class2type<\/span>[<\/span>Object<\/span>.<\/span>prototype<\/span>.<\/span>toString<\/span>.<\/span>call<\/span>(<\/span>obj<\/span>)<\/span>]<\/span> ||<\/span> \"object\"<\/span> :\n        typeof<\/span> obj<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
      \u55ef\uff0c\u770b\u8d77\u6765\u5f88\u5b8c\u7f8e\u7684\u6837\u5b50~~ \u4f46\u662f\u6ce8\u610f\uff0c\u5728 IE6 \u4e2d\uff0cnull \u548c undefined \u4f1a\u88ab Object.prototype.toString \u8bc6\u522b\u6210 [object Object]\uff01<\/p>\n
      \u6211\u53bb\uff0c\u7adf\u7136\u8fd8\u6709\u8fd9\u4e2a\u517c\u5bb9\u6027\uff01\u6709\u4ec0\u4e48\u7b80\u5355\u7684\u65b9\u6cd5\u53ef\u4ee5\u89e3\u51b3\u5417\uff1f\u90a3\u6211\u4eec\u518d\u6539\u5199\u4e00\u7248\uff0c\u7edd\u5bf9\u8ba9\u4f60\u60ca\u8273\uff01<\/p>\n
      <\/p>\n
      \/\/ \u7b2c\u4e8c\u7248<\/span>\nvar<\/span> class2type<\/span> =<\/span> {<\/span>}<\/span>;<\/span>\n\n\/\/ \u751f\u6210class2type\u6620\u5c04<\/span>\n\"Boolean Number String Function Array Date RegExp Object Error\"<\/span>.<\/span>split<\/span>(<\/span>\" \"<\/span>)<\/span>.<\/span>map<\/span>(<\/span>function<\/span>(<\/span>item<\/span>,<\/span> index<\/span>)<\/span> {<\/span>\n    class2type<\/span>[<\/span>\"[object \"<\/span> +<\/span> item<\/span> +<\/span> \"]\"<\/span>]<\/span> =<\/span> item<\/span>.<\/span>toLowerCase<\/span>(<\/span>)<\/span>;<\/span>\n}<\/span>)<\/span>\n\nfunction<\/span> type<\/span>(<\/span>obj<\/span>)<\/span> {<\/span>\n    \/\/ \u4e00\u7bad\u53cc\u96d5<\/span>\n    if<\/span> (<\/span>obj<\/span> ==<\/span> null<\/span>)<\/span> {<\/span>\n        return<\/span> obj<\/span> +<\/span> \"\"<\/span>;<\/span>\n    }<\/span>\n    return<\/span> typeof<\/span> obj<\/span> ===<\/span> \"object\"<\/span> ||<\/span> typeof<\/span> obj<\/span> ===<\/span> \"function\"<\/span> ?\n        class2type<\/span>[<\/span>Object<\/span>.<\/span>prototype<\/span>.<\/span>toString<\/span>.<\/span>call<\/span>(<\/span>obj<\/span>)<\/span>]<\/span> ||<\/span> \"object\"<\/span> :\n        typeof<\/span> obj<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
      isFunction<\/h2>\n
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      <\/p>\n
      function<\/span> isFunction<\/span>(<\/span>obj<\/span>)<\/span> {<\/span>\n    return<\/span> type<\/span>(<\/span>obj<\/span>)<\/span> ===<\/span> \"function\"<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
      \u6570\u7ec4<\/h2>\n
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      <\/p>\n
      var<\/span> isArray<\/span> =<\/span> Array<\/span>.<\/span>isArray<\/span> ||<\/span> function<\/span>(<\/span> obj<\/span> )<\/span> {<\/span>\n    return<\/span> type<\/span>(<\/span>obj<\/span>)<\/span> ===<\/span> \"array\"<\/span>;<\/span>\n}<\/span><\/pre>\n<\/div>\n
      \u4f46\u662f\u5728 jQuery v3.0 \u4e2d\u5df2\u7ecf\u5b8c\u5168\u91c7\u7528\u4e86 Array.isArray\u3002<\/p>\n
      \u7ed3\u8bed<\/h2>\n
      \u5230\u6b64\uff0c\u7c7b\u578b\u5224\u65ad\u7684\u4e0a\u7bc7\u5c31\u7ed3\u675f\u4e86\uff0c\u6211\u4eec\u5df2\u7ecf\u53ef\u4ee5\u5224\u65ad\u65e5\u671f\u3001\u6b63\u5219\u3001\u9519\u8bef\u7c7b\u578b\u5566\uff0c\u4f46\u662f\u8fd8\u6709\u66f4\u590d\u6742\u7684\u5224\u65ad\u6bd4\u5982 plainObject\u3001\u7a7a\u5bf9\u8c61\u3001Window\u5bf9\u8c61\u3001\u7c7b\u6570\u7ec4\u5bf9\u8c61\u7b49\uff0c\u8def\u6f2b\u6f2b\u5176\u4fee\u8fdc\u516e\uff0c\u543e\u5c06\u4e0a\u4e0b\u800c\u6c42\u7d22\u3002<\/p>\n
      \u54e6\uff0c \u5bf9\u4e86\uff0c\u8fd9\u4e2a type \u51fd\u6570\u6284\u7684 jQuery\uff0c\u70b9\u51fb\u67e5\u770b type \u6e90\u7801<\/a>\u3002<\/p>\n
      \u4e13\u9898\u7cfb\u5217<\/h2>\n
      JavaScript\u4e13\u9898\u7cfb\u5217\u76ee\u5f55\u5730\u5740\uff1ahttps:\/\/github.com\/mqyqingfeng\/Blog<\/a>\u3002<\/p>\n
      JavaScript\u4e13\u9898\u7cfb\u5217\u9884\u8ba1\u5199\u4e8c\u5341\u7bc7\u5de6\u53f3\uff0c\u4e3b\u8981\u7814\u7a76\u65e5\u5e38\u5f00\u53d1\u4e2d\u4e00\u4e9b\u529f\u80fd\u70b9\u7684\u5b9e\u73b0\uff0c\u6bd4\u5982\u9632\u6296\u3001\u8282\u6d41\u3001\u53bb\u91cd\u3001\u7c7b\u578b\u5224\u65ad\u3001\u62f7\u8d1d\u3001\u6700\u503c\u3001\u6241\u5e73\u3001\u67ef\u91cc\u3001\u9012\u5f52\u3001\u4e71\u5e8f\u3001\u6392\u5e8f\u7b49\uff0c\u7279\u70b9\u662f\u7814(chao)\u7a76(xi) underscore \u548c jQuery \u7684\u5b9e\u73b0\u65b9\u5f0f\u3002<\/p>\n<\/td>\n
      \u6587\u7ae0\u8f6c\u8f7d\u81eahttps:\/\/github.com\/mqyqingfeng\/Blog\/issues\/28<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
      \u524d\u8a00 \u7c7b\u578b\u5224\u65ad\u5728 web \u5f00\u53d1\u4e2d\u6709\u975e\u5e38\u5e7f\u6cdb\u7684\u5e94\u7528\uff0c\u7b80\u5355\u7684\u6709\u5224\u65ad\u6570\u5b57\u8fd8\u662f\u5b57\u7b26\u4e32\uff0c\u8fdb\u9636\u4e00\u70b9\u7684\u6709\u5224\u65ad\u6570\u7ec4\u8fd8\u662f\u5bf9\u8c61\uff0c\u518d\u8fdb\u9636\u4e00\u70b9\u7684\u6709\u5224\u65ad\u65e5\u671f\u3001\u6b63\u5219\u3001\u9519\u8bef\u7c7b\u578b\uff0c\u518d\u518d\u8fdb\u9636\u4e00\u70b9…<\/p>\n
       Read More  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1380","post","type-post","status-publish","format-standard","hentry","category-learn"],"_links":{"self":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1380"}],"collection":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1380"}],"version-history":[{"count":1,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1380\/revisions"}],"predecessor-version":[{"id":1461,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1380\/revisions\/1461"}],"wp:attachment":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1380"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1380"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1380"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}