{"id":2246,"date":"2017-05-04T11:56:43","date_gmt":"2017-05-04T03:56:43","guid":{"rendered":"http:\/\/www.daliane.com\/?p=2246"},"modified":"2017-05-04T11:57:49","modified_gmt":"2017-05-04T03:57:49","slug":"javascript_yi_bu_bian_cheng","status":"publish","type":"post","link":"http:\/\/www.daliane.com\/category\/jinjiaoyou\/javascript_yi_bu_bian_cheng\/","title":{"rendered":"JavaScript\u5f02\u6b65\u7f16\u7a0b"},"content":{"rendered":"

\n\tJavaScript\u7684\u5355\u7ebf\u7a0b\u7279\u6027\u4e0e\u5f02\u6b65\u7f16\u7a0b\u5b9e\u73b0\u65b9\u5f0f\uff1a
\n\u56de\u8c03\u51fd\u6570\uff0c\u53d1\u5e03\u8ba2\u9605\u6a21\u5f0f\uff0cPromise\u5bf9\u8c61\u4e09\u79cd\uff0c\u5173\u4e8ePromise\u4ecb\u7ecd\u7684\u6bd4\u8f83\u7b80\u7565\uff0c\u51b3\u5b9a\u518d\u8be6\u7ec6\u603b\u7ed3\u4e00\u4e0b\uff0c\u65e2\u662f\u5bf9\u4e0a\u4e00\u7bc7\u6587\u7ae0\u7684\u8865\u5145\uff0c\u4e5f\u80fd\u4ee5\u66f4\u6df1\u523b\u7684\u65b9\u5f0f\u5206\u4eab\u81ea\u5df1\u5173\u4e8e\u5f02\u6b65\u7f16\u7a0b\u7684\u7406\u89e3\u3002\n<\/p>\n

\n\t\u524d\u8a00
\n<\/h2>\n

\n\t\u5982\u679c\u4f60\u6709\u5fd7\u4e8e\u6210\u4e3a\u4e00\u4e2a\u4f18\u79c0\u7684\u524d\u7aef\u5de5\u7a0b\u5e08\uff0c\u6216\u662f\u60f3\u8981\u6df1\u5165\u5b66\u4e60JavaScript\uff0c\u5f02\u6b65\u7f16\u7a0b\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u4e00\u4e2a\u77e5\u8bc6\u70b9\uff0c\u8fd9\u4e5f\u662f\u533a\u5206\u521d\u7ea7\uff0c\u4e2d\u7ea7\u6216\u9ad8\u7ea7\u524d\u7aef\u7684\u4f9d\u636e\u4e4b\u4e00\u3002\u5982\u679c\u4f60\u5bf9\u5f02\u6b65\u7f16\u7a0b\u6ca1\u6709\u592a\u6e05\u6670\u7684\u6982\u5ff5\uff0c\u90a3\u4e48\u6211\u5efa\u8bae\u4f60\u82b1\u70b9\u65f6\u95f4\u5b66\u4e60JavaScript\u5f02\u6b65\u7f16\u7a0b\uff0c\u5982\u679c\u4f60\u5bf9\u5f02\u6b65\u7f16\u7a0b\u6709\u81ea\u5df1\u7684\u72ec\u7279\u7406\u89e3\uff0c\u4e5f\u6b22\u8fce\u9605\u8bfb\u672c\u6587\uff0c\u4e00\u8d77\u4ea4\u6d41\u3002\n<\/p>\n

\n\t\u540c\u6b65\u4e0e\u5f02\u6b65
\n<\/h2>\n

\n\t\u4ecb\u7ecd\u5f02\u6b65\u4e4b\u524d\uff0c\u56de\u987e\u4e00\u4e0b\uff0c\u6240\u8c13\u540c\u6b65\u7f16\u7a0b\uff0c\u5c31\u662f\u8ba1\u7b97\u673a\u4e00\u884c\u4e00\u884c\u6309\u987a\u5e8f\u4f9d\u6b21\u6267\u884c\u4ee3\u7801\uff0c\u5f53\u524d\u4ee3\u7801\u4efb\u52a1\u8017\u65f6\u6267\u884c\u4f1a\u963b\u585e\u540e\u7eed\u4ee3\u7801\u7684\u6267\u884c\u3002\n<\/p>\n

\n

\n\t\t\u540c\u6b65\u7f16\u7a0b\uff0c\u5373\u662f\u4e00\u79cd\u5178\u578b\u7684\u8bf7\u6c42-\u54cd\u5e94\u6a21\u578b\uff0c\u5f53\u8bf7\u6c42\u8c03\u7528\u4e00\u4e2a\u51fd\u6570\u6216\u65b9\u6cd5\u540e\uff0c\u9700\u7b49\u5f85\u5176\u54cd\u5e94\u8fd4\u56de\uff0c\u7136\u540e\u6267\u884c\u540e\u7eed\u4ee3\u7801\u3002\n\t<\/p>\n<\/blockquote>\n

\n\t\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u540c\u6b65\u7f16\u7a0b\uff0c\u4ee3\u7801\u6309\u5e8f\u4f9d\u6b21\u6267\u884c\uff0c\u80fd\u5f88\u597d\u7684\u4fdd\u8bc1\u7a0b\u5e8f\u7684\u6267\u884c\uff0c\u4f46\u662f\u5728\u67d0\u4e9b\u573a\u666f\u4e0b\uff0c\u6bd4\u5982\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\uff0c\u6216\u8bf7\u6c42\u670d\u52a1\u5668\u63a5\u53e3\u6570\u636e\uff0c\u9700\u8981\u6839\u636e\u8fd4\u56de\u7684\u6570\u636e\u5185\u5bb9\u6267\u884c\u540e\u7eed\u64cd\u4f5c\uff0c\u8bfb\u53d6\u6587\u4ef6\u548c\u8bf7\u6c42\u63a5\u53e3\u76f4\u5230\u6570\u636e\u8fd4\u56de\u8fd9\u4e00\u8fc7\u7a0b\u662f\u9700\u8981\u65f6\u95f4\u7684\uff0c\u7f51\u7edc\u8d8a\u5dee\uff0c\u8017\u8d39\u65f6\u95f4\u8d8a\u957f\uff0c\u5982\u679c\u6309\u7167\u540c\u6b65\u7f16\u7a0b\u65b9\u5f0f\u5b9e\u73b0\uff0c\u5728\u7b49\u5f85\u6570\u636e\u8fd4\u56de\u8fd9\u6bb5\u65f6\u95f4\uff0cJavaScript\u662f\u4e0d\u80fd\u5904\u7406\u5176\u4ed6\u4efb\u52a1\u7684\uff0c\u6b64\u65f6\u9875\u9762\u7684\u4ea4\u4e92\uff0c\u6eda\u52a8\u7b49\u4efb\u4f55\u64cd\u4f5c\u4e5f\u90fd\u4f1a\u88ab\u963b\u585e\uff0c\u8fd9\u663e\u7136\u662f\u53ca\u5176\u4e0d\u53cb\u597d\uff0c\u4e0d\u53ef\u63a5\u53d7\u7684\uff0c\u800c\u8fd9\u6b63\u662f\u9700\u8981\u5f02\u6b65\u7f16\u7a0b\u5927\u663e\u8eab\u624b\u7684\u573a\u666f\uff0c\u5982\u4e0b\u56fe\uff0c\u8017\u65f6\u4efb\u52a1A\u4f1a\u963b\u585e\u4efb\u52a1B\u7684\u6267\u884c\uff0c\u7b49\u5230\u4efb\u52a1A\u6267\u884c\u5b8c\u624d\u80fd\u7ee7\u7eed\u6267\u884cB\uff1a\n<\/p>\n

\n\t\"\u540c\u6b65\u7f16\u7a0b\u4efb\u52a1\u963b\u585e\u6d41\u7a0b\"\n<\/p>\n

\n\t\u5f53\u4f7f\u7528\u5f02\u6b65\u7f16\u7a0b\u65f6\uff0c\u5728\u7b49\u5f85\u5f53\u524d\u4efb\u52a1\u7684\u54cd\u5e94\u8fd4\u56de\u4e4b\u524d\uff0c\u53ef\u4ee5\u7ee7\u7eed\u6267\u884c\u540e\u7eed\u4ee3\u7801\uff0c\u5373\u5f53\u524d\u6267\u884c\u4efb\u52a1\u4e0d\u4f1a\u963b\u585e\u540e\u7eed\u6267\u884c\u3002\n<\/p>\n

\n

\n\t\t\u5f02\u6b65\u7f16\u7a0b\uff0c\u4e0d\u540c\u4e8e\u540c\u6b65\u7f16\u7a0b\u7684\u8bf7\u6c42-\u54cd\u5e94\u6a21\u5f0f\uff0c\u5176\u662f\u4e00\u79cd\u4e8b\u4ef6\u9a71\u52a8\u7f16\u7a0b\uff0c\u8bf7\u6c42\u8c03\u7528\u51fd\u6570\u6216\u65b9\u6cd5\u540e\uff0c\u65e0\u9700\u7acb\u5373\u7b49\u5f85\u54cd\u5e94\uff0c\u53ef\u4ee5\u7ee7\u7eed\u6267\u884c\u5176\u4ed6\u4efb\u52a1\uff0c\u800c\u4e4b\u524d\u4efb\u52a1\u54cd\u5e94\u8fd4\u56de\u540e\u53ef\u4ee5\u901a\u8fc7\u72b6\u6001\u3001\u901a\u77e5\u548c\u56de\u8c03\u6765\u901a\u77e5\u8c03\u7528\u8005\u3002\n\t<\/p>\n<\/blockquote>\n

\n\t\u591a\u7ebf\u7a0b
\n<\/h4>\n

\n\t\u524d\u9762\u8bf4\u660e\u4e86\u5f02\u6b65\u7f16\u7a0b\u80fd\u5f88\u597d\u7684\u89e3\u51b3\u540c\u6b65\u7f16\u7a0b\u963b\u585e\u7684\u95ee\u9898\uff0c\u90a3\u4e48\u5b9e\u73b0\u5f02\u6b65\u7684\u65b9\u5f0f\u6709\u54ea\u4e9b\u5462\uff1f\u901a\u5e38\u5b9e\u73b0\u5f02\u6b65\u65b9\u5f0f\u662f\u591a\u7ebf\u7a0b\uff0c\u5982C#, \u5373\u540c\u65f6\u5f00\u542f\u591a\u4e2a\u7ebf\u7a0b\uff0c\u4e0d\u540c\u64cd\u4f5c\u80fd\u5e76\u884c\u6267\u884c\uff0c\u5982\u4e0b\u56fe\uff0c\u8017\u65f6\u4efb\u52a1A\u6267\u884c\u7684\u540c\u65f6\uff0c\u5728\u7ebf\u7a0b\u4e8c\u4e2d\u4efb\u52a1B\u4e5f\u53ef\u4ee5\u6267\u884c\uff1a\n<\/p>\n

\n\t\"\u591a\u7ebf\u7a0b\u5f02\u6b65\u7f16\u7a0b\u65e0\u963b\u585e\u6d41\u7a0b\"\n<\/p>\n

\n\tJAVASCRIPT\u5355\u7ebf\u7a0b
\n<\/h4>\n

\n\tJavaScript\u8bed\u8a00\u6267\u884c\u73af\u5883\u662f\u5355\u7ebf\u7a0b\u7684\uff0c\u5355\u7ebf\u7a0b\u5728\u7a0b\u5e8f\u6267\u884c\u65f6\uff0c\u6240\u8d70\u7684\u7a0b\u5e8f\u8def\u5f84\u6309\u7167\u8fde\u7eed\u987a\u5e8f\u6392\u4e0b\u6765\uff0c\u524d\u9762\u7684\u5fc5\u987b\u5904\u7406\u597d\uff0c\u540e\u9762\u7684\u624d\u4f1a\u6267\u884c\uff0c\u800c\u4f7f\u7528\u5f02\u6b65\u5b9e\u73b0\u65f6\uff0c\u591a\u4e2a\u4efb\u52a1\u53ef\u4ee5\u5e76\u53d1\u6267\u884c\u3002\u90a3\u4e48JavaScript\u7684\u5f02\u6b65\u7f16\u7a0b\u5982\u4f55\u5b9e\u73b0\u5462\uff0c\u4e0b\u4e00\u8282\u5c06\u8be6\u7ec6\u9610\u8ff0\u5176\u5f02\u6b65\u673a\u5236\u3002\n<\/p>\n

\n\t\u5e76\u884c\u4e0e\u5e76\u53d1
\n<\/h4>\n

\n\t\u524d\u6587\u63d0\u5230\u591a\u7ebf\u7a0b\u7684\u4efb\u52a1\u53ef\u4ee5\u5e76\u884c\u6267\u884c\uff0c\u800cJavaScript\u5355\u7ebf\u7a0b\u5f02\u6b65\u7f16\u7a0b\u53ef\u4ee5\u5b9e\u73b0\u591a\u4efb\u52a1\u5e76\u53d1\u6267\u884c\uff0c\u8fd9\u91cc\u6709\u5fc5\u8981\u8bf4\u660e\u4e00\u4e0b\u5e76\u884c\u4e0e\u5e76\u53d1\u7684\u533a\u522b\u3002\n<\/p>\n

    \n
  • \n\t\t\u5e76\u884c\uff0c\u6307\u540c\u4e00\u65f6\u523b\u5185\u591a\u4efb\u52a1\u540c\u65f6\u8fdb\u884c\uff1b\n\t<\/li>\n
  • \n\t\t\u5e76\u53d1\uff0c\u6307\u5728\u540c\u4e00\u65f6\u95f4\u6bb5\u5185\uff0c\u591a\u4efb\u52a1\u540c\u65f6\u8fdb\u884c\u7740\uff0c\u4f46\u662f\u67d0\u4e00\u65f6\u523b\uff0c\u53ea\u6709\u67d0\u4e00\u4efb\u52a1\u6267\u884c\uff1b\n\t<\/li>\n<\/ul>\n

    \n\t\u901a\u5e38\u6240\u8bf4\u7684\u5e76\u53d1\u8fde\u63a5\u6570\uff0c\u662f\u6307\u6d4f\u89c8\u5668\u5411\u670d\u52a1\u5668\u53d1\u8d77\u8bf7\u6c42\uff0c\u5efa\u7acbTCP\u8fde\u63a5\uff0c\u6bcf\u79d2\u949f\u670d\u52a1\u5668\u5efa\u7acb\u7684\u603b\u8fde\u63a5\u6570\uff0c\u800c\u5047\u5982\uff0c\u670d\u52a1\u5668\u590410ms\u80fd\u5904\u7406\u4e00\u4e2a\u8fde\u63a5\uff0c\u90a3\u4e48\u5176\u5e76\u53d1\u8fde\u63a5\u6570\u5c31\u662f100\u3002\n<\/p>\n

    \n\tJavaScript\u5f02\u6b65\u673a\u5236
    \n<\/h2>\n

    \n\t\u672c\u8282\u4ecb\u7ecdJavaScript\u5f02\u6b65\u673a\u5236\uff0c\u9996\u5148\u6765\u770b\u4e00\u4e2a\u4f8b\u5b50\uff1a\n<\/p>\n

    for<\/span> (var<\/span> i = 0<\/span>; i < 5<\/span>; i ++) {\r\n        setTimeout(function<\/span>(<\/span>)<\/span>{ console<\/span>.log(i);\r\n        }, 0<\/span>);\r\n    } console<\/span>.log(i); \/\/5 ; 5 ; 5 ; 5; 5<\/span> <\/pre>\n
    \n\t\u5e94\u8be5\u660e\u767d\u6700\u540e\u8f93\u51fa\u7684\u5168\u662f5\uff1a\n<\/p>\n
      \n
    1. \n\t\ti\u5728\u6b64\u5904\u662ffor\u5faa\u73af\u6240\u5728\u4e0a\u4e0b\u6587\u73af\u5883\u7684\u53d8\u91cf\uff0c\u6709\u4e14\u53ea\u6709\u4e00\u4e2ai;\n\t<\/li>\n
    2. \n\t\t\u5faa\u73af\u7ed3\u675f\u65f6i==5;\n\t<\/li>\n
    3. \n\t\tJavaScript\u5355\u7ebf\u7a0b\u4e8b\u4ef6\u5904\u7406\u5668\u5728\u7ebf\u7a0b\u7a7a\u95f2\u524d\u4e0d\u4f1a\u6267\u884c\u4e0b\u4e00\u4e8b\u4ef6\u3002\n\t<\/li>\n<\/ol>\n
      \n\t\u5982\u4e0a\u9762\u7b2c\u4e09\u70b9\u6240\u8ff0\uff0c\u5982\u679c\u8981\u771f\u6b63\u7406\u89e3\u4ee5\u4e0a\u4f8b\u5b50\u4e2d\u7684setTimeout()\uff0c\u53caJavaScript\u5f02\u6b65\u673a\u5236\uff0c\u9700\u8981\u7406\u89e3JavaScript\u7684\u4e8b\u4ef6\u5faa\u73af\u548c\u5e76\u53d1\u6a21\u578b\u3002\n<\/p>\n
      \n\t\u5e76\u53d1\u6a21\u578b\uff08Concurrency model\uff09
      \n<\/h2>\n
      \n\t\u76ee\u524d\uff0c\u6211\u4eec\u5df2\u7ecf\u77e5\u9053\uff0cJavaScript\u6267\u884c\u5f02\u6b65\u4efb\u52a1\u65f6\uff0c\u4e0d\u9700\u8981\u7b49\u5f85\u54cd\u5e94\u8fd4\u56de\uff0c\u53ef\u4ee5\u7ee7\u7eed\u6267\u884c\u5176\u4ed6\u4efb\u52a1\uff0c\u800c\u5728\u54cd\u5e94\u8fd4\u56de\u65f6\uff0c\u4f1a\u5f97\u5230\u901a\u77e5\uff0c\u6267\u884c\u56de\u8c03\u6216\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u3002\u90a3\u4e48\u8fd9\u4e00\u5207\u5177\u4f53\u662f\u5982\u4f55\u5b8c\u6210\u7684\uff0c\u53c8\u4ee5\u4ec0\u4e48\u89c4\u5219\u6216\u987a\u5e8f\u8fd0\u4f5c\u5462\uff1f\u63a5\u4e0b\u6765\u6211\u4eec\u9700\u8981\u89e3\u7b54\u8fd9\u4e2a\u95ee\u9898\u3002\n<\/p>\n
      \n\t\u6ce8\uff1a\u56de\u8c03\u548c\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u672c\u8d28\u4e0a\u5e76\u65e0\u533a\u522b\uff0c\u53ea\u662f\u5728\u4e0d\u540c\u60c5\u51b5\u4e0b\uff0c\u4e0d\u540c\u7684\u53eb\u6cd5\u3002<\/strong>\n<\/p>\n
      \n\t\u524d\u6587\u5df2\u7ecf\u63d0\u5230\uff0cJavaScript\u5f02\u6b65\u7f16\u7a0b\u4f7f\u5f97\u591a\u4e2a\u4efb\u52a1\u53ef\u4ee5\u5e76\u53d1\u6267\u884c\uff0c\u800c\u5b9e\u73b0\u8fd9\u4e00\u529f\u80fd\u7684\u57fa\u7840\u662fJavScript\u62e5\u6709\u4e00\u4e2a\u57fa\u4e8e\u4e8b\u4ef6\u5faa\u73af\u7684\u5e76\u53d1\u6a21\u578b\u3002\n<\/p>\n
      \n\t\u5806\u6808\u4e0e\u961f\u5217
      \n<\/h4>\n
      \n\t\u4ecb\u7ecdJavaScript\u5e76\u53d1\u6a21\u578b\u4e4b\u524d\uff0c\u5148\u7b80\u5355\u4ecb\u7ecd\u5806\u6808\u548c\u961f\u5217\u7684\u533a\u522b\uff1a\n<\/p>\n
        \n
      • \n\t\t\u5806\uff08heap\uff09\uff1a\u5185\u5b58\u4e2d\u67d0\u4e00\u672a\u88ab\u963b\u6b62\u7684\u533a\u57df\uff0c\u901a\u5e38\u5b58\u50a8\u5bf9\u8c61\uff08\u5f15\u7528\u7c7b\u578b\uff09\uff1b\n\t<\/li>\n
      • \n\t\t\u6808\uff08stack\uff09\uff1a\u540e\u8fdb\u5148\u51fa\u7684\u987a\u5e8f\u5b58\u50a8\u6570\u636e\u7ed3\u6784\uff0c\u901a\u5e38\u5b58\u50a8\u51fd\u6570\u53c2\u6570\u548c\u57fa\u672c\u7c7b\u578b\u503c\u53d8\u91cf\uff08\u6309\u503c\u8bbf\u95ee\uff09\uff1b\n\t<\/li>\n
      • \n\t\t\u961f\u5217\uff08queue\uff09\uff1a\u5148\u8fdb\u5148\u51fa\u987a\u5e8f\u5b58\u50a8\u6570\u636e\u7ed3\u6784\u3002\n\t<\/li>\n<\/ul>\n
        \n\t\u4e8b\u4ef6\u5faa\u73af\uff08Event Loop\uff09
        \n<\/h3>\n
        \n\tJavaScript\u5f15\u64ce\u8d1f\u8d23\u89e3\u6790\uff0c\u6267\u884cJavaScript\u4ee3\u7801\uff0c\u4f46\u5b83\u5e76\u4e0d\u80fd\u5355\u72ec\u8fd0\u884c\uff0c\u901a\u5e38\u90fd\u5f97\u6709\u4e00\u4e2a\u5bbf\u4e3b\u73af\u5883\uff0c\u4e00\u822c\u5982\u6d4f\u89c8\u5668\u6216Node\u670d\u52a1\u5668\uff0c\u524d\u6587\u8bf4\u5230\u7684\u5355\u7ebf\u7a0b\u662f\u6307\u5728\u8fd9\u4e9b\u5bbf\u4e3b\u73af\u5883\u521b\u5efa\u5355\u4e00\u7ebf\u7a0b\uff0c\u63d0\u4f9b\u4e00\u79cd\u673a\u5236\uff0c\u8c03\u7528JavaScript\u5f15\u64ce\u5b8c\u6210\u591a\u4e2aJavaScript\u4ee3\u7801\u5757\u7684\u8c03\u5ea6\uff0c\u6267\u884c\uff08\u662f\u7684\uff0cJavaScript\u4ee3\u7801\u90fd\u662f\u6309\u5757\u6267\u884c\u7684\uff09\uff0c\u8fd9\u79cd\u673a\u5236\u5c31\u79f0\u4e3a\u4e8b\u4ef6\u5faa\u73af\uff08Event Loop\uff09\u3002\n<\/p>\n
        \n\t\u6ce8\uff1a\u8fd9\u91cc\u7684\u4e8b\u4ef6\u4e0eDOM\u4e8b\u4ef6\u4e0d\u8981\u6df7\u6dc6\uff0c\u53ef\u4ee5\u8bf4\u8fd9\u91cc\u7684\u4e8b\u4ef6\u5305\u62ecDOM\u4e8b\u4ef6\uff0c\u6240\u6709\u5f02\u6b65\u64cd\u4f5c\u90fd\u662f\u4e00\u4e2a\u4e8b\u4ef6\uff0c\u8bf8\u5982ajax\u8bf7\u6c42\u5c31\u53ef\u4ee5\u770b\u4f5c\u4e00\u4e2arequest\u8bf7\u6c42\u4e8b\u4ef6\u3002<\/strong>\n<\/p>\n
        \n\tJavaScript\u6267\u884c\u73af\u5883\u4e2d\u5b58\u5728\u7684\u4e24\u4e2a\u7ed3\u6784\u9700\u8981\u4e86\u89e3\uff1a\n<\/p>\n
          \n
        • \n\t\t\u6d88\u606f\u961f\u5217(message queue)\uff0c\u4e5f\u53eb\u4efb\u52a1\u961f\u5217\uff08task queue\uff09\uff1a\u5b58\u50a8\u5f85\u5904\u7406\u6d88\u606f\u53ca\u5bf9\u5e94\u7684\u56de\u8c03\u51fd\u6570\u6216\u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\uff1b\n\t<\/li>\n
        • \n\t\t\u6267\u884c\u6808(execution context stack)\uff0c\u4e5f\u53ef\u4ee5\u53eb\u6267\u884c\u4e0a\u4e0b\u6587\u6808\uff1aJavaScript\u6267\u884c\u6808\uff0c\u987e\u540d\u601d\u4e49\uff0c\u662f\u7531\u6267\u884c\u4e0a\u4e0b\u6587\u7ec4\u6210\uff0c\u5f53\u51fd\u6570\u8c03\u7528\u65f6\uff0c\u521b\u5efa\u5e76\u63d2\u5165\u4e00\u4e2a\u6267\u884c\u4e0a\u4e0b\u6587\uff0c\u901a\u5e38\u79f0\u4e3a\u6267\u884c\u6808\u5e27\uff08frame\uff09\uff0c\u5b58\u50a8\u7740\u51fd\u6570\u53c2\u6570\u548c\u5c40\u90e8\u53d8\u91cf\uff0c\u5f53\u8be5\u51fd\u6570\u6267\u884c\u7ed3\u675f\u65f6\uff0c\u5f39\u51fa\u8be5\u6267\u884c\u6808\u5e27\uff1b\n\t<\/li>\n<\/ul>\n
          \n\t\u6ce8\uff1a\u5173\u4e8e\u5168\u5c40\u4ee3\u7801\uff0c\u7531\u4e8e\u6240\u6709\u7684\u4ee3\u7801\u90fd\u662f\u5728\u5168\u5c40\u4e0a\u4e0b\u6587\u6267\u884c\uff0c\u6240\u4ee5\u6267\u884c\u6808\u9876\u603b\u662f\u5168\u5c40\u4e0a\u4e0b\u6587\u5c31\u5f88\u5bb9\u6613\u7406\u89e3\uff0c\u76f4\u5230\u6240\u6709\u4ee3\u7801\u6267\u884c\u5b8c\u6bd5\uff0c\u5168\u5c40\u4e0a\u4e0b\u6587\u9000\u51fa\u6267\u884c\u6808\uff0c\u6808\u6e05\u7a7a\u4e86\uff1b\u4e5f\u5373\u662f\u5168\u5c40\u4e0a\u4e0b\u6587\u662f\u7b2c\u4e00\u4e2a\u5165\u6808\uff0c\u6700\u540e\u4e00\u4e2a\u51fa\u6808\u3002<\/strong>\n<\/p>\n
          \n\t\u4efb\u52a1
          \n<\/h4>\n
          \n\t\u5206\u6790\u4e8b\u4ef6\u5faa\u73af\u6d41\u7a0b\u524d\uff0c\u5148\u9610\u8ff0\u4e24\u4e2a\u6982\u5ff5\uff0c\u6709\u52a9\u4e8e\u7406\u89e3\u4e8b\u4ef6\u5faa\u73af\uff1a\u540c\u6b65\u4efb\u52a1\u548c\u5f02\u6b65\u4efb\u52a1\u3002\n<\/p>\n
          \n\t\u4efb\u52a1\u5f88\u597d\u7406\u89e3\uff0cJavaScript\u4ee3\u7801\u6267\u884c\u5c31\u662f\u5728\u5b8c\u6210\u4efb\u52a1\uff0c\u6240\u8c13\u4efb\u52a1\u5c31\u662f\u4e00\u4e2a\u51fd\u6570\u6216\u4e00\u4e2a\u4ee3\u7801\u5757\uff0c\u901a\u5e38\u4ee5\u529f\u80fd\u6216\u76ee\u7684\u5212\u5206\uff0c\u6bd4\u5982\u5b8c\u6210\u4e00\u6b21\u52a0\u6cd5\u8ba1\u7b97\uff0c\u5b8c\u6210\u4e00\u6b21ajax\u8bf7\u6c42\uff1b\u5f88\u81ea\u7136\u7684\u5c31\u5206\u4e3a\u540c\u6b65\u4efb\u52a1\u548c\u5f02\u6b65\u4efb\u52a1\u3002\u540c\u6b65\u4efb\u52a1\u662f\u8fde\u7eed\u7684\uff0c\u963b\u585e\u7684\uff1b\u800c\u5f02\u6b65\u4efb\u52a1\u5219\u662f\u4e0d\u8fde\u7eed\uff0c\u975e\u963b\u585e\u7684\uff0c\u5305\u542b\u5f02\u6b65\u4e8b\u4ef6\u53ca\u5176\u56de\u8c03\uff0c\u5f53\u6211\u4eec\u8c08\u53ca\u6267\u884c\u5f02\u6b65\u4efb\u52a1\u65f6\uff0c\u901a\u5e38\u6307\u6267\u884c\u5176\u56de\u8c03\u51fd\u6570\u3002\n<\/p>\n
          \n\t\u4e8b\u4ef6\u5faa\u73af\u6d41\u7a0b
          \n<\/h4>\n
          \n\t\u5173\u4e8e\u4e8b\u4ef6\u5faa\u73af\u6d41\u7a0b\u5206\u89e3\u5982\u4e0b\uff1a\n<\/p>\n
            \n
          1. \n\t\t\u5bbf\u4e3b\u73af\u5883\u4e3aJavaScript\u521b\u5efa\u7ebf\u7a0b\u65f6\uff0c\u4f1a\u521b\u5efa\u5806(heap)\u548c\u6808(stack)\uff0c\u5806\u5185\u5b58\u50a8JavaScript\u5bf9\u8c61\uff0c\u6808\u5185\u5b58\u50a8\u6267\u884c\u4e0a\u4e0b\u6587\uff1b\n\t<\/li>\n
          2. \n\t\t\u6808\u5185\u6267\u884c\u4e0a\u4e0b\u6587\u7684\u540c\u6b65\u4efb\u52a1\u6309\u5e8f\u6267\u884c\uff0c\u6267\u884c\u5b8c\u5373\u9000\u6808\uff0c\u800c\u5f53\u5f02\u6b65\u4efb\u52a1\u6267\u884c\u65f6\uff0c\u8be5\u5f02\u6b65\u4efb\u52a1\u8fdb\u5165\u7b49\u5f85\u72b6\u6001\uff08\u4e0d\u5165\u6808\uff09\uff0c\u540c\u65f6\u901a\u77e5\u7ebf\u7a0b\uff1a\u5f53\u89e6\u53d1\u8be5\u4e8b\u4ef6\u65f6\uff08\u6216\u8be5\u5f02\u6b65\u64cd\u4f5c\u54cd\u5e94\u8fd4\u56de\u65f6\uff09\uff0c\u9700\u5411\u6d88\u606f\u961f\u5217\u63d2\u5165\u4e00\u4e2a\u4e8b\u4ef6\u6d88\u606f\uff1b\n\t<\/li>\n
          3. \n\t\t\u5f53\u4e8b\u4ef6\u89e6\u53d1\u6216\u54cd\u5e94\u8fd4\u56de\u65f6\uff0c\u7ebf\u7a0b\u5411\u6d88\u606f\u961f\u5217\u63d2\u5165\u8be5\u4e8b\u4ef6\u6d88\u606f\uff08\u5305\u542b\u4e8b\u4ef6\u53ca\u56de\u8c03\uff09\uff1b\n\t<\/li>\n
          4. \n\t\t\u5f53\u6808\u5185\u540c\u6b65\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\u540e\uff0c\u7ebf\u7a0b\u4ece\u6d88\u606f\u961f\u5217\u53d6\u51fa\u4e00\u4e2a\u4e8b\u4ef6\u6d88\u606f\uff0c\u5176\u5bf9\u5e94\u5f02\u6b65\u4efb\u52a1\uff08\u51fd\u6570\uff09\u5165\u6808\uff0c\u6267\u884c\u56de\u8c03\u51fd\u6570\uff0c\u5982\u679c\u672a\u7ed1\u5b9a\u56de\u8c03\uff0c\u8fd9\u4e2a\u6d88\u606f\u4f1a\u88ab\u4e22\u5f03\uff0c\u6267\u884c\u5b8c\u4efb\u52a1\u540e\u9000\u6808\uff1b\n\t<\/li>\n
          5. \n\t\t\u5f53\u7ebf\u7a0b\u7a7a\u95f2\uff08\u5373\u6267\u884c\u6808\u6e05\u7a7a\uff09\u65f6\u7ee7\u7eed\u62c9\u53d6\u6d88\u606f\u961f\u5217\u4e0b\u4e00\u8f6e\u6d88\u606f\uff08next tick\uff0c\u4e8b\u4ef6\u5faa\u73af\u6d41\u8f6c\u4e00\u6b21\u79f0\u4e3a\u4e00\u6b21tick\uff09\u3002\n\t<\/li>\n<\/ol>\n
            \n\t\u4f7f\u7528\u4ee3\u7801\u53ef\u4ee5\u63cf\u8ff0\u5982\u4e0b\uff1a\n<\/p>\n
            var<\/span> eventLoop = []; var<\/span> event<\/span>; var<\/span> i = eventLoop.length - 1<\/span>; \/\/ \u540e\u8fdb\u5148\u51fa<\/span> while<\/span>(eventLoop[i]) { event<\/span> = eventLoop[i--]; if<\/span> (event<\/span>) { \/\/ \u4e8b\u4ef6\u56de\u8c03\u5b58\u5728<\/span> event<\/span>();\r\n        } \/\/ \u5426\u5219\u4e8b\u4ef6\u6d88\u606f\u88ab\u4e22\u5f03<\/span> }<\/pre>\n
            \n\t\u8fd9\u91cc\u6ce8\u610f\u7684\u4e00\u70b9\u662f\u7b49\u5f85\u4e0b\u4e00\u4e2a\u4e8b\u4ef6\u6d88\u606f\u7684\u8fc7\u7a0b\u662f\u540c\u6b65\u7684\u3002\n<\/p>\n
            \n\t\u5e76\u53d1\u6a21\u578b\u4e0e\u4e8b\u4ef6\u5faa\u73af
            \n<\/h5>\n
            var<\/span> ele = document<\/span>.querySelector('body'<\/span>); function<\/span> clickCb<\/span>(event<\/span>) <\/span>{ console<\/span>.log('clicked'<\/span>);\r\n    } function<\/span> bindEvent<\/span>(callback<\/span>) <\/span>{\r\n        ele.addEventListener('click'<\/span>, callback);\r\n    }   \r\n\r\n    bindEvent(clickCb);<\/pre>\n
            \n\t\u9488\u5bf9\u5982\u4e0a\u4ee3\u7801\u6211\u4eec\u53ef\u4ee5\u6784\u5efa\u5982\u4e0b\u5e76\u53d1\u6a21\u578b\uff1a\n<\/p>\n
            \n\t\"JavaScript\u5e76\u53d1\u6a21\u578b\"\n<\/p>\n
            \n\t\u5982\u4e0a\u56fe\uff0c\u5f53\u6267\u884c\u6808\u540c\u6b65\u4ee3\u7801\u5757\u4f9d\u6b21\u6267\u884c\u5b8c\u76f4\u5230\u9047\u89c1\u5f02\u6b65\u4efb\u52a1\u65f6\uff0c\u5f02\u6b65\u4efb\u52a1\u8fdb\u5165\u7b49\u5f85\u72b6\u6001\uff0c\u901a\u77e5\u7ebf\u7a0b\uff0c\u5f02\u6b65\u4e8b\u4ef6\u89e6\u53d1\u65f6\uff0c\u5f80\u6d88\u606f\u961f\u5217\u63d2\u5165\u4e00\u6761\u4e8b\u4ef6\u6d88\u606f\uff1b\u800c\u5f53\u6267\u884c\u6808\u540e\u7eed\u540c\u6b65\u4ee3\u7801\u6267\u884c\u5b8c\u540e\uff0c\u8bfb\u53d6\u6d88\u606f\u961f\u5217\uff0c\u5f97\u5230\u4e00\u6761\u6d88\u606f\uff0c\u7136\u540e\u5c06\u8be5\u6d88\u606f\u5bf9\u5e94\u7684\u5f02\u6b65\u4efb\u52a1\u5165\u6808\uff0c\u6267\u884c\u56de\u8c03\u51fd\u6570\uff1b\u4e00\u6b21\u4e8b\u4ef6\u5faa\u73af\u5c31\u5b8c\u6210\u4e86\uff0c\u4e5f\u5373\u5904\u7406\u4e86\u4e00\u4e2a\u5f02\u6b65\u4efb\u52a1\u3002\n<\/p>\n
            \n\t\u518d\u8c08SETTIMEOUT(\u20260)
            \n<\/h4>\n
            \n\t\u4e86\u89e3\u4e86JavaScript\u4e8b\u4ef6\u5faa\u73af\u540e\u6211\u4eec\u518d\u770b\u524d\u6587\u5173\u4e8esetTimeout(…0)\u7684\u4f8b\u5b50\u5c31\u6bd4\u8f83\u6e05\u6670\u4e86\uff1a\n<\/p>\n
            \n\tsetTimeout(…0)\u6240\u8868\u8fbe\u7684\u610f\u601d\u662f\uff1a\u7b49\u5f850\u79d2\u540e\uff08\u8fd9\u4e2a\u65f6\u95f4\u7531\u7b2c\u4e8c\u4e2a\u53c2\u6570\u503c\u786e\u5b9a\uff09\uff0c\u5f80\u6d88\u606f\u961f\u5217\u63d2\u5165\u4e00\u6761\u5b9a\u65f6\u5668\u4e8b\u4ef6\u6d88\u606f\uff0c\u5e76\u5c06\u5176\u7b2c\u4e00\u4e2a\u53c2\u6570\u4f5c\u4e3a\u56de\u8c03\u51fd\u6570\uff1b\u800c\u5f53\u6267\u884c\u6808\u5185\u540c\u6b65\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\u65f6\uff0c\u7ebf\u7a0b\u4ece\u6d88\u606f\u961f\u5217\u8bfb\u53d6\u6d88\u606f\uff0c\u5c06\u8be5\u5f02\u6b65\u4efb\u52a1\u5165\u6808\uff0c\u6267\u884c\uff1b\u7ebf\u7a0b\u7a7a\u95f2\u65f6\u518d\u6b21\u4ece\u6d88\u606f\u961f\u5217\u8bfb\u53d6\u6d88\u606f\u3002\n<\/p>\n
            \n\t\u518d\u770b\u4e00\u4e2a\u5b9e\u4f8b\uff1a\n<\/p>\n
            var<\/span> start = +new<\/span> Date<\/span>(); var<\/span> arr = [];\r\n\r\n    setTimeout(function<\/span>(<\/span>)<\/span>{ console<\/span>.log('time: '<\/span> + (new<\/span> Date<\/span>().getTime() - start));\r\n    },10<\/span>); for<\/span>(var<\/span> i=0<\/span>;i<=1000000<\/span>;i++){\r\n        arr.push(i);\r\n    }<\/pre>\n
            \n\t\u6267\u884c\u591a\u6b21\u8f93\u51fa\u5982\u4e0b\uff1a\n<\/p>\n
            \n\t\"setTimeout(...0)\"\n<\/p>\n
            \n\t\u5728setTimeout\u5f02\u6b65\u56de\u8c03\u51fd\u6570\u91cc\u6211\u4eec\u8f93\u51fa\u4e86\u5f02\u6b65\u4efb\u52a1\u6ce8\u518c\u5230\u6267\u884c\u7684\u65f6\u95f4\uff0c\u53d1\u73b0\u5e76\u4e0d\u7b49\u4e8e\u6211\u4eec\u6307\u5b9a\u7684\u65f6\u95f4\uff0c\u800c\u4e14\u4e24\u6b21\u65f6\u95f4\u95f4\u9694\u4e5f\u90fd\u4e0d\u540c\uff0c\u8003\u8651\u4ee5\u4e0b\u4e24\u70b9\uff1a\n<\/p>\n
              \n
            • \n\t\t\u5728\u8bfb\u53d6\u6d88\u606f\u961f\u5217\u7684\u6d88\u606f\u65f6\uff0c\u5f97\u7b49\u540c\u6b65\u4efb\u52a1\u5b8c\u6210\uff0c\u8fd9\u4e2a\u662f\u9700\u8981\u8017\u8d39\u65f6\u95f4\u7684\uff1b\n\t<\/li>\n
            • \n\t\t\u6d88\u606f\u961f\u5217\u5148\u8fdb\u5148\u51fa\u539f\u5219\uff0c\u8bfb\u53d6\u6b64\u5f02\u6b65\u4e8b\u4ef6\u6d88\u606f\u4e4b\u524d\uff0c\u53ef\u80fd\u8fd8\u5b58\u5728\u5176\u4ed6\u6d88\u606f\uff0c\u6267\u884c\u4e5f\u9700\u8981\u8017\u65f6\uff1b\n\t<\/li>\n<\/ul>\n
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              \n\tWEB WORKERS
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              \n\tJavaScript\u5f02\u6b65\u5b9e\u73b0
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