{"id":1385,"date":"2024-06-02T22:32:55","date_gmt":"2024-06-02T22:32:55","guid":{"rendered":""},"modified":"2024-06-05T03:10:11","modified_gmt":"2024-06-04T19:10:11","slug":"javascript%e6%b7%b1%e5%85%a5%e4%b9%8b%e9%97%ad%e5%8c%85","status":"publish","type":"post","link":"https:\/\/www.lccc.top\/?p=1385","title":{"rendered":"JavaScript\u6df1\u5165\u4e4b\u95ed\u5305"},"content":{"rendered":"\n

\u5b9a\u4e49<\/h2>\n

MDN \u5bf9\u95ed\u5305\u7684\u5b9a\u4e49\u4e3a\uff1a<\/p>\n

\n

\u95ed\u5305\u662f\u6307\u90a3\u4e9b\u80fd\u591f\u8bbf\u95ee\u81ea\u7531\u53d8\u91cf\u7684\u51fd\u6570\u3002<\/p>\n<\/blockquote>\n

\u90a3\u4ec0\u4e48\u662f\u81ea\u7531\u53d8\u91cf\u5462\uff1f<\/p>\n

\n

\u81ea\u7531\u53d8\u91cf\u662f\u6307\u5728\u51fd\u6570\u4e2d\u4f7f\u7528\u7684\uff0c\u4f46\u65e2\u4e0d\u662f\u51fd\u6570\u53c2\u6570\u4e5f\u4e0d\u662f\u51fd\u6570\u7684\u5c40\u90e8\u53d8\u91cf\u7684\u53d8\u91cf\u3002<\/p>\n<\/blockquote>\n

\u7531\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u51fa\u95ed\u5305\u5171\u6709\u4e24\u90e8\u5206\u7ec4\u6210\uff1a<\/p>\n

\n

\u95ed\u5305 = \u51fd\u6570 + \u51fd\u6570\u80fd\u591f\u8bbf\u95ee\u7684\u81ea\u7531\u53d8\u91cf<\/p>\n<\/blockquote>\n

\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n

<\/p>\n
var<\/span> a<\/span> =<\/span> 1<\/span>;<\/span>\n\nfunction<\/span> foo<\/span>(<\/span>)<\/span> {<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>a<\/span>)<\/span>;<\/span>\n}<\/span>\n\nfoo<\/span>(<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
foo \u51fd\u6570\u53ef\u4ee5\u8bbf\u95ee\u53d8\u91cf a\uff0c\u4f46\u662f a \u65e2\u4e0d\u662f foo \u51fd\u6570\u7684\u5c40\u90e8\u53d8\u91cf\uff0c\u4e5f\u4e0d\u662f foo \u51fd\u6570\u7684\u53c2\u6570\uff0c\u6240\u4ee5 a \u5c31\u662f\u81ea\u7531\u53d8\u91cf\u3002<\/p>\n
\u90a3\u4e48\uff0c\u51fd\u6570 foo + foo \u51fd\u6570\u8bbf\u95ee\u7684\u81ea\u7531\u53d8\u91cf a \u4e0d\u5c31\u662f\u6784\u6210\u4e86\u4e00\u4e2a\u95ed\u5305\u561b\u2026\u2026<\/p>\n
\u8fd8\u771f\u662f\u8fd9\u6837\u7684\uff01<\/p>\n
\u6240\u4ee5\u5728\u300aJavaScript\u6743\u5a01\u6307\u5357\u300b\u4e2d\u5c31\u8bb2\u5230\uff1a\u4ece\u6280\u672f\u7684\u89d2\u5ea6\u8bb2\uff0c\u6240\u6709\u7684JavaScript\u51fd\u6570\u90fd\u662f\u95ed\u5305\u3002<\/p>\n
\u54a6\uff0c\u8fd9\u600e\u4e48\u8ddf\u6211\u4eec\u5e73\u65f6\u770b\u5230\u7684\u8bb2\u5230\u7684\u95ed\u5305\u4e0d\u4e00\u6837\u5462\uff01\uff1f<\/p>\n
\u522b\u7740\u6025\uff0c\u8fd9\u662f\u7406\u8bba\u4e0a\u7684\u95ed\u5305\uff0c\u5176\u5b9e\u8fd8\u6709\u4e00\u4e2a\u5b9e\u8df5\u89d2\u5ea6\u4e0a\u7684\u95ed\u5305\uff0c\u8ba9\u6211\u4eec\u770b\u770b\u6c64\u59c6\u5927\u53d4\u7ffb\u8bd1\u7684\u5173\u4e8e\u95ed\u5305\u7684\u6587\u7ae0\u4e2d\u7684\u5b9a\u4e49\uff1a<\/p>\n
ECMAScript\u4e2d\uff0c\u95ed\u5305\u6307\u7684\u662f\uff1a<\/p>\n
    \n
  1. \u4ece\u7406\u8bba\u89d2\u5ea6\uff1a\u6240\u6709\u7684\u51fd\u6570\u3002\u56e0\u4e3a\u5b83\u4eec\u90fd\u5728\u521b\u5efa\u7684\u65f6\u5019\u5c31\u5c06\u4e0a\u5c42\u4e0a\u4e0b\u6587\u7684\u6570\u636e\u4fdd\u5b58\u8d77\u6765\u4e86\u3002\u54ea\u6015\u662f\u7b80\u5355\u7684\u5168\u5c40\u53d8\u91cf\u4e5f\u662f\u5982\u6b64\uff0c\u56e0\u4e3a\u51fd\u6570\u4e2d\u8bbf\u95ee\u5168\u5c40\u53d8\u91cf\u5c31\u76f8\u5f53\u4e8e\u662f\u5728\u8bbf\u95ee\u81ea\u7531\u53d8\u91cf\uff0c\u8fd9\u4e2a\u65f6\u5019\u4f7f\u7528\u6700\u5916\u5c42\u7684\u4f5c\u7528\u57df\u3002<\/li>\n
  2. \u4ece\u5b9e\u8df5\u89d2\u5ea6\uff1a\u4ee5\u4e0b\u51fd\u6570\u624d\u7b97\u662f\u95ed\u5305\uff1a\n
      \n
    1. \u5373\u4f7f\u521b\u5efa\u5b83\u7684\u4e0a\u4e0b\u6587\u5df2\u7ecf\u9500\u6bc1\uff0c\u5b83\u4ecd\u7136\u5b58\u5728\uff08\u6bd4\u5982\uff0c\u5185\u90e8\u51fd\u6570\u4ece\u7236\u51fd\u6570\u4e2d\u8fd4\u56de\uff09<\/li>\n
    2. \u5728\u4ee3\u7801\u4e2d\u5f15\u7528\u4e86\u81ea\u7531\u53d8\u91cf<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n
      \u63a5\u4e0b\u6765\u5c31\u6765\u8bb2\u8bb2\u5b9e\u8df5\u4e0a\u7684\u95ed\u5305\u3002<\/p>\n
      \u5206\u6790<\/h2>\n
      \u8ba9\u6211\u4eec\u5148\u5199\u4e2a\u4f8b\u5b50\uff0c\u4f8b\u5b50\u4f9d\u7136\u662f\u6765\u81ea\u300aJavaScript\u6743\u5a01\u6307\u5357\u300b\uff0c\u7a0d\u5fae\u505a\u70b9\u6539\u52a8\uff1a<\/p>\n
      <\/p>\n
      var<\/span> scope<\/span> =<\/span> \"global scope\"<\/span>;<\/span>\nfunction<\/span> checkscope<\/span>(<\/span>)<\/span>{<\/span>\n    var<\/span> scope<\/span> =<\/span> \"local scope\"<\/span>;<\/span>\n    function<\/span> f<\/span>(<\/span>)<\/span>{<\/span>\n        return<\/span> scope<\/span>;<\/span>\n    }<\/span>\n    return<\/span> f<\/span>;<\/span>\n}<\/span>\n\nvar<\/span> foo<\/span> =<\/span> checkscope<\/span>(<\/span>)<\/span>;<\/span>\nfoo<\/span>(<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
      \u9996\u5148\u6211\u4eec\u8981\u5206\u6790\u4e00\u4e0b\u8fd9\u6bb5\u4ee3\u7801\u4e2d\u6267\u884c\u4e0a\u4e0b\u6587\u6808\u548c\u6267\u884c\u4e0a\u4e0b\u6587\u7684\u53d8\u5316\u60c5\u51b5\u3002<\/p>\n
      \u53e6\u4e00\u4e2a\u4e0e\u8fd9\u6bb5\u4ee3\u7801\u76f8\u4f3c\u7684\u4f8b\u5b50\uff0c\u5728\u300aJavaScript\u6df1\u5165\u4e4b\u6267\u884c\u4e0a\u4e0b\u6587\u300b<\/a>\u4e2d\u6709\u7740\u975e\u5e38\u8be6\u7ec6\u7684\u5206\u6790\u3002\u5982\u679c\u770b\u4e0d\u61c2\u4ee5\u4e0b\u7684\u6267\u884c\u8fc7\u7a0b\uff0c\u5efa\u8bae\u5148\u9605\u8bfb\u8fd9\u7bc7\u6587\u7ae0\u3002<\/p>\n
      \u8fd9\u91cc\u76f4\u63a5\u7ed9\u51fa\u7b80\u8981\u7684\u6267\u884c\u8fc7\u7a0b\uff1a<\/p>\n
        \n
      1. \u8fdb\u5165\u5168\u5c40\u4ee3\u7801\uff0c\u521b\u5efa\u5168\u5c40\u6267\u884c\u4e0a\u4e0b\u6587\uff0c\u5168\u5c40\u6267\u884c\u4e0a\u4e0b\u6587\u538b\u5165\u6267\u884c\u4e0a\u4e0b\u6587\u6808<\/li>\n
      2. \u5168\u5c40\u6267\u884c\u4e0a\u4e0b\u6587\u521d\u59cb\u5316<\/li>\n
      3. \u6267\u884c checkscope \u51fd\u6570\uff0c\u521b\u5efa checkscope \u51fd\u6570\u6267\u884c\u4e0a\u4e0b\u6587\uff0ccheckscope \u6267\u884c\u4e0a\u4e0b\u6587\u88ab\u538b\u5165\u6267\u884c\u4e0a\u4e0b\u6587\u6808<\/li>\n
      4. checkscope \u6267\u884c\u4e0a\u4e0b\u6587\u521d\u59cb\u5316\uff0c\u521b\u5efa\u53d8\u91cf\u5bf9\u8c61\u3001\u4f5c\u7528\u57df\u94fe\u3001this\u7b49<\/li>\n
      5. checkscope \u51fd\u6570\u6267\u884c\u5b8c\u6bd5\uff0ccheckscope \u6267\u884c\u4e0a\u4e0b\u6587\u4ece\u6267\u884c\u4e0a\u4e0b\u6587\u6808\u4e2d\u5f39\u51fa<\/li>\n
      6. \u6267\u884c f \u51fd\u6570\uff0c\u521b\u5efa f \u51fd\u6570\u6267\u884c\u4e0a\u4e0b\u6587\uff0cf \u6267\u884c\u4e0a\u4e0b\u6587\u88ab\u538b\u5165\u6267\u884c\u4e0a\u4e0b\u6587\u6808<\/li>\n
      7. f \u6267\u884c\u4e0a\u4e0b\u6587\u521d\u59cb\u5316\uff0c\u521b\u5efa\u53d8\u91cf\u5bf9\u8c61\u3001\u4f5c\u7528\u57df\u94fe\u3001this\u7b49<\/li>\n
      8. f \u51fd\u6570\u6267\u884c\u5b8c\u6bd5\uff0cf \u51fd\u6570\u4e0a\u4e0b\u6587\u4ece\u6267\u884c\u4e0a\u4e0b\u6587\u6808\u4e2d\u5f39\u51fa<\/li>\n<\/ol>\n
        \u4e86\u89e3\u5230\u8fd9\u4e2a\u8fc7\u7a0b\uff0c\u6211\u4eec\u5e94\u8be5\u601d\u8003\u4e00\u4e2a\u95ee\u9898\uff0c\u90a3\u5c31\u662f\uff1a<\/p>\n
        \u5f53 f \u51fd\u6570\u6267\u884c\u7684\u65f6\u5019\uff0ccheckscope \u51fd\u6570\u4e0a\u4e0b\u6587\u5df2\u7ecf\u88ab\u9500\u6bc1\u4e86\u554a(\u5373\u4ece\u6267\u884c\u4e0a\u4e0b\u6587\u6808\u4e2d\u88ab\u5f39\u51fa)\uff0c\u600e\u4e48\u8fd8\u4f1a\u8bfb\u53d6\u5230 checkscope \u4f5c\u7528\u57df\u4e0b\u7684 scope \u503c\u5462\uff1f<\/p>\n
        \u4ee5\u4e0a\u7684\u4ee3\u7801\uff0c\u8981\u662f\u8f6c\u6362\u6210 PHP\uff0c\u5c31\u4f1a\u62a5\u9519\uff0c\u56e0\u4e3a\u5728 PHP \u4e2d\uff0cf \u51fd\u6570\u53ea\u80fd\u8bfb\u53d6\u5230\u81ea\u5df1\u4f5c\u7528\u57df\u548c\u5168\u5c40\u4f5c\u7528\u57df\u91cc\u7684\u503c\uff0c\u6240\u4ee5\u8bfb\u4e0d\u5230 checkscope \u4e0b\u7684 scope \u503c\u3002(\u8fd9\u6bb5\u6211\u95ee\u7684PHP\u540c\u4e8b\u2026\u2026)<\/p>\n
        \u7136\u800c JavaScript \u5374\u662f\u53ef\u4ee5\u7684\uff01<\/p>\n
        \u5f53\u6211\u4eec\u4e86\u89e3\u4e86\u5177\u4f53\u7684\u6267\u884c\u8fc7\u7a0b\u540e\uff0c\u6211\u4eec\u77e5\u9053 f \u6267\u884c\u4e0a\u4e0b\u6587\u7ef4\u62a4\u4e86\u4e00\u4e2a\u4f5c\u7528\u57df\u94fe\uff1a<\/p>\n
        <\/p>\n
        fContext<\/span> =<\/span> {<\/span>\n    Scope<\/span>: [<\/span>AO<\/span>,<\/span> checkscopeContext<\/span>.<\/span>AO<\/span>,<\/span> globalContext<\/span>.<\/span>VO<\/span>]<\/span>,<\/span>\n}<\/span><\/pre>\n<\/div>\n
        \u5bf9\u7684\uff0c\u5c31\u662f\u56e0\u4e3a\u8fd9\u4e2a\u4f5c\u7528\u57df\u94fe\uff0cf \u51fd\u6570\u4f9d\u7136\u53ef\u4ee5\u8bfb\u53d6\u5230 checkscopeContext.AO \u7684\u503c\uff0c\u8bf4\u660e\u5f53 f \u51fd\u6570\u5f15\u7528\u4e86 checkscopeContext.AO \u4e2d\u7684\u503c\u7684\u65f6\u5019\uff0c\u5373\u4f7f checkscopeContext \u88ab\u9500\u6bc1\u4e86\uff0c\u4f46\u662f JavaScript \u4f9d\u7136\u4f1a\u8ba9 checkscopeContext.AO \u6d3b\u5728\u5185\u5b58\u4e2d\uff0cf \u51fd\u6570\u4f9d\u7136\u53ef\u4ee5\u901a\u8fc7 f \u51fd\u6570\u7684\u4f5c\u7528\u57df\u94fe\u627e\u5230\u5b83\uff0c\u6b63\u662f\u56e0\u4e3a JavaScript \u505a\u5230\u4e86\u8fd9\u4e00\u70b9\uff0c\u4ece\u800c\u5b9e\u73b0\u4e86\u95ed\u5305\u8fd9\u4e2a\u6982\u5ff5\u3002<\/p>\n
        \u6240\u4ee5\uff0c\u8ba9\u6211\u4eec\u518d\u770b\u4e00\u904d\u5b9e\u8df5\u89d2\u5ea6\u4e0a\u95ed\u5305\u7684\u5b9a\u4e49\uff1a<\/p>\n
          \n
        1. \u5373\u4f7f\u521b\u5efa\u5b83\u7684\u4e0a\u4e0b\u6587\u5df2\u7ecf\u9500\u6bc1\uff0c\u5b83\u4ecd\u7136\u5b58\u5728\uff08\u6bd4\u5982\uff0c\u5185\u90e8\u51fd\u6570\u4ece\u7236\u51fd\u6570\u4e2d\u8fd4\u56de\uff09<\/li>\n
        2. \u5728\u4ee3\u7801\u4e2d\u5f15\u7528\u4e86\u81ea\u7531\u53d8\u91cf<\/li>\n<\/ol>\n
          \u5728\u8fd9\u91cc\u518d\u8865\u5145\u4e00\u4e2a\u300aJavaScript\u6743\u5a01\u6307\u5357\u300b\u82f1\u6587\u539f\u7248\u5bf9\u95ed\u5305\u7684\u5b9a\u4e49:<\/p>\n
          \n
          This combination of a function object and a scope (a set of variable bindings) in which the function\u2019s variables are resolved is called a closure in the computer science literature.<\/p>\n<\/blockquote>\n
          \u95ed\u5305\u5728\u8ba1\u7b97\u673a\u79d1\u5b66\u4e2d\u4e5f\u53ea\u662f\u4e00\u4e2a\u666e\u901a\u7684\u6982\u5ff5\uff0c\u5927\u5bb6\u4e0d\u8981\u53bb\u60f3\u5f97\u592a\u590d\u6742\u3002<\/p>\n
          \u5fc5\u5237\u9898<\/h2>\n
          \u63a5\u4e0b\u6765\uff0c\u770b\u8fd9\u9053\u5237\u9898\u5fc5\u5237\uff0c\u9762\u8bd5\u5fc5\u8003\u7684\u95ed\u5305\u9898\uff1a<\/p>\n
          <\/p>\n
          var<\/span> data<\/span> =<\/span> [<\/span>]<\/span>;<\/span>\n\nfor<\/span> (<\/span>var<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> 3<\/span>;<\/span> i<\/span>++<\/span>)<\/span> {<\/span>\n  data<\/span>[<\/span>i<\/span>]<\/span> =<\/span> function<\/span> (<\/span>)<\/span> {<\/span>\n    console<\/span>.<\/span>log<\/span>(<\/span>i<\/span>)<\/span>;<\/span>\n  }<\/span>;<\/span>\n}<\/span>\n\ndata<\/span>[<\/span>0<\/span>]<\/span>(<\/span>)<\/span>;<\/span>\ndata<\/span>[<\/span>1<\/span>]<\/span>(<\/span>)<\/span>;<\/span>\ndata<\/span>[<\/span>2<\/span>]<\/span>(<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
          \u7b54\u6848\u662f\u90fd\u662f 3\uff0c\u8ba9\u6211\u4eec\u5206\u6790\u4e00\u4e0b\u539f\u56e0\uff1a<\/p>\n
          \u5f53\u6267\u884c\u5230 data[0] \u51fd\u6570\u4e4b\u524d\uff0c\u6b64\u65f6\u5168\u5c40\u4e0a\u4e0b\u6587\u7684 VO \u4e3a\uff1a<\/p>\n
          <\/p>\n
          globalContext<\/span> =<\/span> {<\/span>\n    VO<\/span>: {<\/span>\n        data<\/span>: [<\/span>...]<\/span>,<\/span>\n        i<\/span>: 3<\/span>\n    }<\/span>\n}<\/span><\/pre>\n<\/div>\n
          \u5f53\u6267\u884c data[0] \u51fd\u6570\u7684\u65f6\u5019\uff0cdata[0] \u51fd\u6570\u7684\u4f5c\u7528\u57df\u94fe\u4e3a\uff1a<\/p>\n
          <\/p>\n
          data<\/span>[<\/span>0<\/span>]<\/span>Context<\/span> =<\/span> {<\/span>\n    Scope<\/span>: [<\/span>AO<\/span>,<\/span> globalContext<\/span>.<\/span>VO<\/span>]<\/span>\n}<\/span><\/pre>\n<\/div>\n
          data[0]Context \u7684 AO \u5e76\u6ca1\u6709 i \u503c\uff0c\u6240\u4ee5\u4f1a\u4ece globalContext.VO \u4e2d\u67e5\u627e\uff0ci \u4e3a 3\uff0c\u6240\u4ee5\u6253\u5370\u7684\u7ed3\u679c\u5c31\u662f 3\u3002<\/p>\n
          data[1] \u548c data[2] \u662f\u4e00\u6837\u7684\u9053\u7406\u3002<\/p>\n
          \u6240\u4ee5\u8ba9\u6211\u4eec\u6539\u6210\u95ed\u5305\u770b\u770b\uff1a<\/p>\n
          <\/p>\n
          var<\/span> data<\/span> =<\/span> [<\/span>]<\/span>;<\/span>\n\nfor<\/span> (<\/span>var<\/span> i<\/span> =<\/span> 0<\/span>;<\/span> i<\/span> <<\/span> 3<\/span>;<\/span> i<\/span>++<\/span>)<\/span> {<\/span>\n  data<\/span>[<\/span>i<\/span>]<\/span> =<\/span> (<\/span>function<\/span> (<\/span>i<\/span>)<\/span> {<\/span>\n        return<\/span> function<\/span>(<\/span>)<\/span>{<\/span>\n            console<\/span>.<\/span>log<\/span>(<\/span>i<\/span>)<\/span>;<\/span>\n        }<\/span>\n  }<\/span>)<\/span>(<\/span>i<\/span>)<\/span>;<\/span>\n}<\/span>\n\ndata<\/span>[<\/span>0<\/span>]<\/span>(<\/span>)<\/span>;<\/span>\ndata<\/span>[<\/span>1<\/span>]<\/span>(<\/span>)<\/span>;<\/span>\ndata<\/span>[<\/span>2<\/span>]<\/span>(<\/span>)<\/span>;<\/span><\/pre>\n<\/div>\n
          \u5f53\u6267\u884c\u5230 data[0] \u51fd\u6570\u4e4b\u524d\uff0c\u6b64\u65f6\u5168\u5c40\u4e0a\u4e0b\u6587\u7684 VO \u4e3a\uff1a<\/p>\n
          <\/p>\n
          globalContext<\/span> =<\/span> {<\/span>\n    VO<\/span>: {<\/span>\n        data<\/span>: [<\/span>...]<\/span>,<\/span>\n        i<\/span>: 3<\/span>\n    }<\/span>\n}<\/span><\/pre>\n<\/div>\n
          \u8ddf\u6ca1\u6539\u4e4b\u524d\u4e00\u6a21\u4e00\u6837\u3002<\/p>\n
          \u5f53\u6267\u884c data[0] \u51fd\u6570\u7684\u65f6\u5019\uff0cdata[0] \u51fd\u6570\u7684\u4f5c\u7528\u57df\u94fe\u53d1\u751f\u4e86\u6539\u53d8\uff1a<\/p>\n
          <\/p>\n
          data<\/span>[<\/span>0<\/span>]<\/span>Context<\/span> =<\/span> {<\/span>\n    Scope<\/span>: [<\/span>AO<\/span>,<\/span> \u533f\u540d\u51fd\u6570Context<\/span>.<\/span>AO<\/span> globalContext<\/span>.<\/span>VO<\/span>]<\/span>\n}<\/span><\/pre>\n<\/div>\n
          \u533f\u540d\u51fd\u6570\u6267\u884c\u4e0a\u4e0b\u6587\u7684AO\u4e3a\uff1a<\/p>\n
          <\/p>\n
          \u533f\u540d\u51fd\u6570Context<\/span> =<\/span> {<\/span>\n    AO<\/span>: {<\/span>\n        arguments<\/span>: {<\/span>\n            0<\/span>: 0<\/span>,<\/span>\n            length<\/span>: 1<\/span>\n        }<\/span>,<\/span>\n        i<\/span>: 0<\/span>\n    }<\/span>\n}<\/span><\/pre>\n<\/div>\n
          data[0]Context \u7684 AO \u5e76\u6ca1\u6709 i \u503c\uff0c\u6240\u4ee5\u4f1a\u6cbf\u7740\u4f5c\u7528\u57df\u94fe\u4ece\u533f\u540d\u51fd\u6570 Context.AO \u4e2d\u67e5\u627e\uff0c\u8fd9\u65f6\u5019\u5c31\u4f1a\u627e i \u4e3a 0\uff0c\u627e\u5230\u4e86\u5c31\u4e0d\u4f1a\u5f80 globalContext.VO \u4e2d\u67e5\u627e\u4e86\uff0c\u5373\u4f7f globalContext.VO \u4e5f\u6709 i \u7684\u503c(\u503c\u4e3a3)\uff0c\u6240\u4ee5\u6253\u5370\u7684\u7ed3\u679c\u5c31\u662f0\u3002<\/p>\n
          data[1] \u548c data[2] \u662f\u4e00\u6837\u7684\u9053\u7406\u3002<\/p>\n
          \u4e0b\u4e00\u7bc7\u6587\u7ae0<\/h2>\n
          JavaScript\u6df1\u5165\u4e4b\u53c2\u6570\u6309\u503c\u4f20\u9012<\/a><\/p>\n
          \u76f8\u5173\u94fe\u63a5<\/h2>\n
          \u5982\u679c\u60f3\u4e86\u89e3\u6267\u884c\u4e0a\u4e0b\u6587\u7684\u5177\u4f53\u53d8\u5316\uff0c\u4e0d\u59a8\u5faa\u5e8f\u6e10\u8fdb\uff0c\u9605\u8bfb\u8fd9\u516d\u7bc7\uff1a<\/p>\n
          \u300aJavaScript\u6df1\u5165\u4e4b\u8bcd\u6cd5\u4f5c\u7528\u57df\u548c\u52a8\u6001\u4f5c\u7528\u57df\u300b<\/a><\/p>\n
          \u300aJavaScript\u6df1\u5165\u4e4b\u6267\u884c\u4e0a\u4e0b\u6587\u6808\u300b<\/a><\/p>\n
          \u300aJavaScript\u6df1\u5165\u4e4b\u53d8\u91cf\u5bf9\u8c61\u300b<\/a><\/p>\n
          \u300aJavaScript\u6df1\u5165\u4e4b\u4f5c\u7528\u57df\u94fe\u300b<\/a><\/p>\n
          \u300aJavaScript\u6df1\u5165\u4e4b\u4eceECMAScript\u89c4\u8303\u89e3\u8bfbthis\u300b<\/a><\/p>\n
          \u300aJavaScript\u6df1\u5165\u4e4b\u6267\u884c\u4e0a\u4e0b\u6587\u300b<\/a><\/p>\n
          \u6df1\u5165\u7cfb\u5217<\/h2>\n
          JavaScript\u6df1\u5165\u7cfb\u5217\u76ee\u5f55\u5730\u5740\uff1ahttps:\/\/github.com\/mqyqingfeng\/Blog<\/a>\u3002<\/p>\n
          JavaScript\u6df1\u5165\u7cfb\u5217\u9884\u8ba1\u5199\u5341\u4e94\u7bc7\u5de6\u53f3\uff0c\u65e8\u5728\u5e2e\u5927\u5bb6\u634b\u987aJavaScript\u5e95\u5c42\u77e5\u8bc6\uff0c\u91cd\u70b9\u8bb2\u89e3\u5982\u539f\u578b\u3001\u4f5c\u7528\u57df\u3001\u6267\u884c\u4e0a\u4e0b\u6587\u3001\u53d8\u91cf\u5bf9\u8c61\u3001this\u3001\u95ed\u5305\u3001\u6309\u503c\u4f20\u9012\u3001call\u3001apply\u3001bind\u3001new\u3001\u7ee7\u627f\u7b49\u96be\u70b9\u6982\u5ff5\u3002<\/p>\n
          \u5982\u679c\u6709\u9519\u8bef\u6216\u8005\u4e0d\u4e25\u8c28\u7684\u5730\u65b9\uff0c\u8bf7\u52a1\u5fc5\u7ed9\u4e88\u6307\u6b63\uff0c\u5341\u5206\u611f\u8c22\u3002\u5982\u679c\u559c\u6b22\u6216\u8005\u6709\u6240\u542f\u53d1\uff0c\u6b22\u8fcestar\uff0c\u5bf9\u4f5c\u8005\u4e5f\u662f\u4e00\u79cd\u9f13\u52b1\u3002<\/p>\n<\/td>\n
          \u6587\u7ae0\u8f6c\u8f7d\u81eahttps:\/\/github.com\/mqyqingfeng\/Blog\/issues\/9<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
          \u5b9a\u4e49 MDN \u5bf9\u95ed\u5305\u7684\u5b9a\u4e49\u4e3a\uff1a \u95ed\u5305\u662f\u6307\u90a3\u4e9b\u80fd\u591f\u8bbf\u95ee\u81ea\u7531\u53d8\u91cf\u7684\u51fd\u6570\u3002 \u90a3\u4ec0\u4e48\u662f\u81ea\u7531\u53d8\u91cf\u5462\uff1f \u81ea\u7531\u53d8\u91cf\u662f\u6307\u5728\u51fd\u6570\u4e2d\u4f7f\u7528\u7684\uff0c\u4f46\u65e2\u4e0d\u662f\u51fd\u6570\u53c2\u6570\u4e5f\u4e0d\u662f\u51fd\u6570\u7684\u5c40\u90e8\u53d8\u91cf\u7684\u53d8…<\/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-1385","post","type-post","status-publish","format-standard","hentry","category-learn"],"_links":{"self":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1385"}],"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=1385"}],"version-history":[{"count":1,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1385\/revisions"}],"predecessor-version":[{"id":1496,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1385\/revisions\/1496"}],"wp:attachment":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1385"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1385"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1385"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}