{"id":164552,"date":"2024-05-08T14:57:10","date_gmt":"2024-05-08T06:57:10","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/164552.html"},"modified":"2024-05-08T14:57:16","modified_gmt":"2024-05-08T06:57:16","slug":"this%e5%af%b9%e8%b1%a1%e7%9a%84%e7%90%86%e8%a7%a3%e5%8f%8ajavascript%e4%b8%ad%e6%89%a7%e8%a1%8c%e4%b8%8a%e4%b8%8b%e6%96%87%e5%92%8c%e6%89%a7%e8%a1%8c%e6%a0%88%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/164552.html","title":{"rendered":"this\u5bf9\u8c61\u7684\u7406\u89e3\u53caJavaScript\u4e2d\u6267\u884c\u4e0a\u4e0b\u6587\u548c\u6267\u884c\u6808\u662f\u4ec0\u4e48"},"content":{"rendered":"

\"this\u5bf9\u8c61\u7684\u7406\u89e3\u53caJavaScript\u4e2d\u6267\u884c\u4e0a\u4e0b\u6587\u548c\u6267\u884c\u6808\u662f\u4ec0\u4e48\"<\/p>\n

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\u4e00\u3001THIS<\/code>\u5bf9\u8c61\u7684\u7406\u89e3<\/h3>\n<\/p>\n

this<\/code>\u5728JavaScript\u4e2d\u662f\u4e00\u4e2a\u5173\u952e\u5b57\uff0c\u5b83\u7684\u503c\u901a\u5e38\u7531\u6267\u884c\u4e0a\u4e0b\u6587\u4e2d\u7684\u51fd\u6570\u8c03\u7528\u6a21\u5f0f\u51b3\u5b9a\u3002\u5728\u5168\u5c40\u73af\u5883\u4e2d\uff0cthis<\/code>\u4ee3\u8868\u5168\u5c40\u5bf9\u8c61\uff1b\u5728\u5bf9\u8c61\u65b9\u6cd5\u4e2d\uff0cthis<\/code>\u4ee3\u8868\u8c03\u7528\u8be5\u65b9\u6cd5\u7684\u5bf9\u8c61\uff1b\u5728\u4e8b\u4ef6\u5904\u7406\u51fd\u6570\u4e2d\uff0cthis<\/code>\u901a\u5e38\u6307\u5411\u54cd\u5e94\u4e8b\u4ef6\u7684\u5143\u7d20\uff1b\u5728\u4e25\u683c\u6a21\u5f0f\uff08'use strict'\uff09\u4e0b\uff0c\u672a\u6307\u5b9a\u4e0a\u4e0b\u6587\u7684\u51fd\u6570\u4e2dthis<\/code>\u503c\u662fundefined<\/code>\u3002<\/p>\n<\/p>\n

    \n
  • \n

    \u5168\u5c40\u4e0a\u4e0b\u6587\u4e0e\u51fd\u6570\u8c03\u7528<\/strong>\uff1a\u5728\u6700\u57fa\u672c\u7684\u573a\u666f\u4e0b\uff0c\u5982\u679c\u51fd\u6570\u4e0d\u4f5c\u4e3a\u67d0\u4e2a\u5bf9\u8c61\u7684\u65b9\u6cd5\u88ab\u8c03\u7528\uff0c\u90a3\u4e48this<\/code>\u6307\u5411\u5168\u5c40\u5bf9\u8c61\uff08\u5728\u6d4f\u89c8\u5668\u4e2d\u662fwindow<\/code>\uff09\u3002\u7136\u800c\uff0c'use strict'\u6a21\u5f0f\u6539\u53d8\u4e86\u8fd9\u4e00\u884c\u4e3a\uff0cthis<\/code>\u5c06\u4f1a\u662fundefined<\/code>\uff0c\u907f\u514d\u4e86\u65e0\u610f\u95f4\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u521b\u5efa\u53d8\u91cf\u3002<\/p>\n<\/p>\n<\/li>\n

  • \n

    \u5bf9\u8c61\u65b9\u6cd5\u4e2d\u7684this<\/code><\/strong>\uff1a\u5f53\u51fd\u6570\u4f5c\u4e3a\u5bf9\u8c61\u7684\u65b9\u6cd5\u88ab\u8c03\u7528\u65f6\uff0cthis<\/code>\u5728\u65b9\u6cd5\u8fd0\u884c\u65f6\u6307\u4ee3\u8be5\u5bf9\u8c61\uff0c\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u8bbf\u95ee\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u5176\u4ed6\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<\/li>\n<\/ul>\n

    \u4e8c\u3001\u6267\u884c\u4e0a\u4e0b\u6587\uff08EXECUTION CONTEXT\uff09<\/h3>\n<\/p>\n

    \u6267\u884c\u4e0a\u4e0b\u6587\u662f\u8fd0\u884cJavaScript\u4ee3\u7801\u7684\u73af\u5883\uff0c\u5b83\u51b3\u5b9a\u4e86\u4ee3\u7801\u4e2d\u53d8\u91cf\u7684\u4f5c\u7528\u8303\u56f4\u3002\u6bcf\u5f53\u8fdb\u5165\u4e00\u4e2a\u65b0\u7684\u6267\u884c\u73af\u5883\u65f6\uff0c\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u6267\u884c\u4e0a\u4e0b\u6587\u3002<\/p>\n<\/p>\n

      \n
    • \n

      \u5168\u5c40\u6267\u884c\u4e0a\u4e0b\u6587<\/strong>\uff1a\u8fd9\u662f\u9ed8\u8ba4\u6216\u57fa\u7840\u7684\u73af\u5883\uff0c\u5176\u4e2d\u4efb\u4f55\u4e0d\u5728\u51fd\u6570\u5185\u90e8\u7684\u4ee3\u7801\u90fd\u4f1a\u5728\u8fd9\u91cc\u6267\u884c\u3002\u6bcf\u4e2a\u7a0b\u5e8f\u4e2d\u53ea\u4f1a\u6709\u4e00\u4e2a\u5168\u5c40\u6267\u884c\u4e0a\u4e0b\u6587\u3002<\/p>\n<\/p>\n<\/li>\n

    • \n

      \u51fd\u6570\u6267\u884c\u4e0a\u4e0b\u6587<\/strong>\uff1a\u8fd9\u79cd\u4e0a\u4e0b\u6587\u5728\u8c03\u7528\u51fd\u6570\u65f6\u521b\u5efa\u3002\u6bcf\u4e2a\u51fd\u6570\u90fd\u4f1a\u6709\u5176\u81ea\u5df1\u7684\u6267\u884c\u4e0a\u4e0b\u6587\uff0c\u4f46\u53ea\u6709\u5f53\u8be5\u51fd\u6570\u88ab\u8c03\u7528\u65f6\u5b83\u624d\u4f1a\u88ab\u521b\u5efa\u3002<\/p>\n<\/p>\n<\/li>\n<\/ul>\n

      \u4e09\u3001\u6267\u884c\u6808\uff08EXECUTION STACK\uff09<\/h3>\n<\/p>\n

      \u53c8\u79f0\u4e3a\u8c03\u7528\u6808\uff0c\u63a7\u5236\u7740\u7a0b\u5e8f\u7684\u63a7\u5236\u6d41\u7a0b\uff08\u5373\u4ee3\u7801\u7684\u6267\u884c\u987a\u5e8f\uff09\u3002JavaScript\u662f\u4e00\u79cd\u5355\u7ebf\u7a0b\u8bed\u8a00\uff0c\u56e0\u6b64\u5728\u4efb\u4f55\u65f6\u523b\u53ea\u80fd\u6267\u884c\u4e00\u4e2a\u4efb\u52a1\u3002<\/p>\n<\/p>\n

        \n
      • \n

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      • \n

        \u51fd\u6570\u8c03\u7528\u4e0e\u6267\u884c\u6808<\/strong>\uff1a\u5f53\u811a\u672c\u9996\u6b21\u8fd0\u884c\u65f6\uff0cJavaScript\u5f15\u64ce\u4f1a\u751f\u6210\u4e00\u4e2a\u5168\u5c40\u6267\u884c\u4e0a\u4e0b\u6587\u5e76\u5c06\u5176\u63a8\u5165\u6267\u884c\u6808\u5e95\u90e8\u3002\u6bcf\u5f53\u53d1\u751f\u51fd\u6570\u8c03\u7528\u65f6\uff0c\u5f15\u64ce\u90fd\u4f1a\u4e3a\u8be5\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6267\u884c\u4e0a\u4e0b\u6587\u5e76\u5c06\u5176\u63a8\u5165\u6808\u9876\u3002<\/p>\n<\/p>\n<\/li>\n<\/ul>\n

        \u56db\u3001THIS<\/code>\u3001\u6267\u884c\u4e0a\u4e0b\u6587\u4e0e\u6267\u884c\u6808\u4e4b\u95f4\u7684\u76f8\u4e92\u4f5c\u7528<\/h3>\n<\/p>\n

        \u8fd9\u4e09\u8005\u4e4b\u95f4\u7684\u52a8\u6001\u5173\u7cfb\u5bf9\u4e8e\u7406\u89e3JavaScript\u4e2d\u7684\u4ee3\u7801\u6267\u884c\u6d41\u3001\u4f5c\u7528\u57df\u94fe\u3001\u95ed\u5305\u7b49\u9ad8\u7ea7\u6982\u5ff5\u975e\u5e38\u91cd\u8981\u3002<\/p>\n<\/p>\n

          \n
        • \n

          this<\/code>\u548c\u6267\u884c\u4e0a\u4e0b\u6587<\/strong>\uff1athis<\/code>\u7684\u503c\u662f\u5728\u8fdb\u5165\u6267\u884c\u4e0a\u4e0b\u6587\u65f6\u786e\u5b9a\u7684\uff0c\u5e76\u4e14\u5728\u4e0a\u4e0b\u6587\u7684\u751f\u547d\u5468\u671f\u5185\u4fdd\u6301\u4e0d\u53d8\u3002\u8fd9\u4f7f\u5f97\u6211\u4eec\u80fd\u591f\u6839\u636e\u6240\u5728\u7684\u6267\u884c\u4e0a\u4e0b\u6587\u786e\u5b9athis<\/code>\u7684\u5177\u4f53\u6307\u5411\u3002<\/p>\n<\/p>\n<\/li>\n

        • \n

          \u6267\u884c\u4e0a\u4e0b\u6587\u548c\u6267\u884c\u6808<\/strong>\uff1a\u6267\u884c\u6808\u63d0\u4f9b\u4e86\u4e00\u4e2a\u6309\u987a\u5e8f\u6267\u884c\u591a\u4e2a\u6267\u884c\u4e0a\u4e0b\u6587\u7684\u673a\u5236\uff0c\u4fdd\u8bc1\u4e86\u4ee3\u7801\u6267\u884c\u7684\u8fde\u8d2f\u6027\u548c\u4e00\u81f4\u6027\u3002\u5f53\u51fd\u6570\u6267\u884c\u5b8c\u6bd5\u540e\uff0c\u5176\u6267\u884c\u4e0a\u4e0b\u6587\u4f1a\u4ece\u6267\u884c\u6808\u4e2d\u5f39\u51fa\uff0c\u63a7\u5236\u6743\u8f6c\u79fb\u5230\u5f53\u524d\u6808\u9876\u7684\u6267\u884c\u4e0a\u4e0b\u6587\u3002<\/p>\n<\/p>\n<\/li>\n<\/ul>\n

          \u7406\u89e3this<\/code>\u3001\u6267\u884c\u4e0a\u4e0b\u6587\u548c\u6267\u884c\u6808\u7684\u5de5\u4f5c\u539f\u7406\u548c\u76f8\u4e92\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u5bf9\u4e8e\u6df1\u5165\u7406\u89e3JavaScript\u7684\u8fd0\u884c\u673a\u5236\u548c\u7f16\u5199\u9ad8\u6548\u3001\u53ef\u7ef4\u62a4\u7684\u4ee3\u7801\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<\/p>\n

          \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n

          \u4ec0\u4e48\u662fthis\u5bf9\u8c61\uff1f\u5728JavaScript\u4e2d\uff0cthis\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u5173\u952e\u5b57\uff0c\u5b83\u6307\u5411\u5f53\u524d\u6267\u884c\u4ee3\u7801\u7684\u4e0a\u4e0b\u6587\u5bf9\u8c61\u3002this\u7684\u503c\u5728\u51fd\u6570\u88ab\u8c03\u7528\u65f6\u786e\u5b9a\uff0c\u5b83\u7684\u6307\u5411\u4e0e\u51fd\u6570\u7684\u8c03\u7528\u65b9\u5f0f\u6709\u5173\u3002\u5e38\u89c1\u7684\u4f7f\u7528\u573a\u666f\u5305\u62ec\u5728\u5bf9\u8c61\u65b9\u6cd5\u4e2d\u5f15\u7528\u5f53\u524d\u5bf9\u8c61\uff0c\u6216\u8005\u5728\u6784\u9020\u51fd\u6570\u4e2d\u5f15\u7528\u65b0\u521b\u5efa\u7684\u5b9e\u4f8b\u3002\u4e0d\u540c\u7684\u8c03\u7528\u65b9\u5f0f\u4f1a\u5bfc\u81f4this\u7684\u503c\u6709\u6240\u4e0d\u540c\u3002<\/strong><\/p>\n

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