{"id":1372,"date":"2024-06-02T22:27:29","date_gmt":"2024-06-02T22:27:29","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%e5%a6%82%e4%bd%95%e5%88%a4%e6%96%ad%e4%b8%a4%e4%b8%aa%e5%af%b9%e8%b1%a1%e7%9b%b8%e7%ad%89","status":"publish","type":"post","link":"https:\/\/www.lccc.top\/?p=1372","title":{"rendered":"JavaScript\u4e13\u9898\u4e4b\u5982\u4f55\u5224\u65ad\u4e24\u4e2a\u5bf9\u8c61\u76f8\u7b49"},"content":{"rendered":"\n

\u524d\u8a00<\/h2>\n

\u867d\u7136\u6807\u9898\u5199\u7684\u662f\u5982\u4f55\u5224\u65ad\u4e24\u4e2a\u5bf9\u8c61\u76f8\u7b49\uff0c\u4f46\u672c\u7bc7\u6211\u4eec\u4e0d\u4ec5\u4ec5\u5224\u65ad\u4e24\u4e2a\u5bf9\u8c61\u76f8\u7b49\uff0c\u5b9e\u9645\u4e0a\uff0c\u6211\u4eec\u8981\u505a\u5230\u7684\u662f\u5982\u4f55\u5224\u65ad\u4e24\u4e2a\u53c2\u6570\u76f8\u7b49\uff0c\u800c\u8fd9\u5fc5\u7136\u4f1a\u6d89\u53ca\u5230\u591a\u79cd\u7c7b\u578b\u7684\u5224\u65ad\u3002<\/p>\n

\u76f8\u7b49<\/h2>\n

\u4ec0\u4e48\u662f\u76f8\u7b49\uff1f\u5728\u300aJavaScript\u4e13\u9898\u4e4b\u53bb\u91cd\u300b<\/a>\u4e2d\uff0c\u6211\u4eec\u8ba4\u4e3a\u53ea\u8981 ===<\/code> \u7684\u7ed3\u679c\u4e3a true\uff0c\u4e24\u8005\u5c31\u76f8\u7b49\uff0c\u7136\u800c\u4eca\u5929\u6211\u4eec\u91cd\u65b0\u5b9a\u4e49\u76f8\u7b49\uff1a<\/p>\n

\u6211\u4eec\u8ba4\u4e3a\uff1a<\/p>\n

    \n
  1. NaN \u548c NaN \u662f\u76f8\u7b49<\/li>\n
  2. [1] \u548c [1] \u662f\u76f8\u7b49<\/li>\n
  3. {value: 1} \u548c {value: 1} \u662f\u76f8\u7b49<\/li>\n<\/ol>\n

    \u4e0d\u4ec5\u4ec5\u662f\u8fd9\u4e9b\u957f\u5f97\u4e00\u6837\u7684\uff0c\u8fd8\u6709<\/p>\n

      \n
    1. 1 \u548c new Number(1) \u662f\u76f8\u7b49<\/li>\n
    2. ‘Curly’ \u548c new String(‘Curly’) \u662f\u76f8\u7b49<\/li>\n
    3. true \u548c new Boolean(true) \u662f\u76f8\u7b49<\/li>\n<\/ol>\n

      \u66f4\u590d\u6742\u7684\u6211\u4eec\u4f1a\u5728\u63a5\u4e0b\u6765\u7684\u5185\u5bb9\u4e2d\u770b\u5230\u3002<\/p>\n

      \u76ee\u6807<\/h2>\n

      \u6211\u4eec\u7684\u76ee\u6807\u662f\u5199\u4e00\u4e2a eq \u51fd\u6570\u7528\u6765\u5224\u65ad\u4e24\u4e2a\u53c2\u6570\u662f\u5426\u76f8\u7b49\uff0c\u4f7f\u7528\u6548\u679c\u5982\u4e0b\uff1a<\/p>\n

      <\/p>\n
      function<\/span> eq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span> {<\/span> ... }<\/span>\n\nvar<\/span> a<\/span> =<\/span> [<\/span>1<\/span>]<\/span>;<\/span>\nvar<\/span> b<\/span> =<\/span> [<\/span>1<\/span>]<\/span>;<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>eq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span>)<\/span> \/\/ true<\/span><\/pre>\n<\/div>\n
      \u5728\u5199\u8fd9\u4e2a\u770b\u4f3c\u5f88\u7b80\u5355\u7684\u51fd\u6570\u4e4b\u524d\uff0c\u6211\u4eec\u9996\u5148\u4e86\u89e3\u5728\u4e00\u4e9b\u7b80\u5355\u7684\u60c5\u51b5\u4e0b\u662f\u5982\u4f55\u5224\u65ad\u7684\uff1f<\/p>\n
      +0 \u4e0e -0<\/h2>\n
      \u5982\u679c a === b \u7684\u7ed3\u679c\u4e3a true\uff0c \u90a3\u4e48 a \u548c b \u5c31\u662f\u76f8\u7b49\u7684\u5417\uff1f\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u5f53\u7136\u662f\u8fd9\u6837\u7684\uff0c\u4f46\u662f\u6709\u4e00\u4e2a\u7279\u6b8a\u7684\u4f8b\u5b50\uff0c\u5c31\u662f +0 \u548c -0\u3002<\/p>\n
      JavaScript \u201c\u5904\u5fc3\u79ef\u8651\u201d\u7684\u60f3\u62b9\u5e73\u4e24\u8005\u7684\u5dee\u5f02\uff1a<\/p>\n
      <\/p>\n
      \/\/ \u8868\u73b01<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>+<\/span>0<\/span> ===<\/span> -<\/span>0<\/span>)<\/span>;<\/span> \/\/ true<\/span>\n\n\/\/ \u8868\u73b02<\/span>\n(<\/span>-<\/span>0<\/span>)<\/span>.<\/span>toString<\/span>(<\/span>)<\/span> \/\/ '0'<\/span>\n(<\/span>+<\/span>0<\/span>)<\/span>.<\/span>toString<\/span>(<\/span>)<\/span> \/\/ '0'<\/span>\n\n\/\/ \u8868\u73b03<\/span>\n-<\/span>0<\/span> <<\/span> +<\/span>0<\/span> \/\/ false<\/span>\n+<\/span>0<\/span> <<\/span> -<\/span>0<\/span> \/\/ false<\/span><\/pre>\n<\/div>\n
      \u5373\u4fbf\u5982\u6b64\uff0c\u4e24\u8005\u4f9d\u7136\u662f\u4e0d\u540c\u7684\uff1a<\/p>\n
      <\/p>\n
      1<\/span> \/<\/span> +<\/span>0<\/span> \/\/ Infinity<\/span>\n1<\/span> \/<\/span> -<\/span>0<\/span> \/\/ -Infinity<\/span>\n\n1<\/span> \/<\/span> +<\/span>0<\/span> ===<\/span> 1<\/span> \/<\/span> -<\/span>0<\/span> \/\/ false<\/span><\/pre>\n<\/div>\n
      \u4e5f\u8bb8\u4f60\u4f1a\u597d\u5947\u4e3a\u4ec0\u4e48\u8981\u6709 +0 \u548c -0 \u5462\uff1f<\/p>\n
      \u8fd9\u662f\u56e0\u4e3a JavaScript \u91c7\u7528\u4e86IEEE_754 \u6d6e\u70b9\u6570\u8868\u793a\u6cd5(\u51e0\u4e4e\u6240\u6709\u73b0\u4ee3\u7f16\u7a0b\u8bed\u8a00\u6240\u91c7\u7528)\uff0c\u8fd9\u662f\u4e00\u79cd\u4e8c\u8fdb\u5236\u8868\u793a\u6cd5\uff0c\u6309\u7167\u8fd9\u4e2a\u6807\u51c6\uff0c\u6700\u9ad8\u4f4d\u662f\u7b26\u53f7\u4f4d(0 \u4ee3\u8868\u6b63\uff0c1 \u4ee3\u8868\u8d1f)\uff0c\u5269\u4e0b\u7684\u7528\u4e8e\u8868\u793a\u5927\u5c0f\u3002\u800c\u5bf9\u4e8e\u96f6\u8fd9\u4e2a\u8fb9\u754c\u503c \uff0c1000(-0) \u548c 0000(0)\u90fd\u662f\u8868\u793a 0 \uff0c\u8fd9\u624d\u6709\u4e86\u6b63\u8d1f\u96f6\u7684\u533a\u522b\u3002<\/p>\n
      \u4e5f\u8bb8\u4f60\u4f1a\u597d\u5947\u4ec0\u4e48\u65f6\u5019\u4f1a\u4ea7\u751f -0 \u5462\uff1f<\/p>\n
      \n
      Math<\/span>.<\/span>round<\/span>(<\/span>-<\/span>0.1<\/span>)<\/span> \/\/ -0<\/span><\/pre>\n<\/div>\n
      \u90a3\u4e48\u6211\u4eec\u53c8\u8be5\u5982\u4f55\u5728 === \u7ed3\u679c\u4e3a true \u7684\u65f6\u5019\uff0c\u533a\u522b 0 \u548c -0 \u5f97\u51fa\u6b63\u786e\u7684\u7ed3\u679c\u5462\uff1f\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u505a\uff1a<\/p>\n
      <\/p>\n
      function<\/span> eq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span>{<\/span>\n    if<\/span> (<\/span>a<\/span> ===<\/span> b<\/span>)<\/span> return<\/span> a<\/span> !==<\/span> 0<\/span> ||<\/span> 1<\/span> \/<\/span> a<\/span> ===<\/span> 1<\/span> \/<\/span> b<\/span>;<\/span>\n    return<\/span> false<\/span>;<\/span>\n}<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>eq<\/span>(<\/span>0<\/span>,<\/span> 0<\/span>)<\/span>)<\/span> \/\/ true<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>eq<\/span>(<\/span>0<\/span>,<\/span> -<\/span>0<\/span>)<\/span>)<\/span> \/\/ false<\/span><\/pre>\n<\/div>\n
      NaN<\/h2>\n
      \u5728\u672c\u7bc7\uff0c\u6211\u4eec\u8ba4\u4e3a NaN \u548c NaN \u662f\u76f8\u7b49\u7684\uff0c\u90a3\u53c8\u8be5\u5982\u4f55\u5224\u65ad\u51fa NaN \u5462\uff1f<\/p>\n
      \n
      console<\/span>.<\/span>log<\/span>(<\/span>NaN<\/span> ===<\/span> NaN<\/span>)<\/span>;<\/span> \/\/ false<\/span><\/pre>\n<\/div>\n
      \u5229\u7528 NaN \u4e0d\u7b49\u4e8e\u81ea\u8eab\u7684\u7279\u6027\uff0c\u6211\u4eec\u53ef\u4ee5\u533a\u522b\u51fa NaN\uff0c\u90a3\u4e48\u8fd9\u4e2a eq \u51fd\u6570\u53c8\u8be5\u600e\u4e48\u5199\u5462\uff1f<\/p>\n
      <\/p>\n
      function<\/span> eq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span> {<\/span>\n    if<\/span> (<\/span>a<\/span> !==<\/span> a<\/span>)<\/span> return<\/span> b<\/span> !==<\/span> b<\/span>;<\/span>\n}<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>eq<\/span>(<\/span>NaN<\/span>,<\/span> NaN<\/span>)<\/span>)<\/span>;<\/span> \/\/ true<\/span><\/pre>\n<\/div>\n
      eq \u51fd\u6570<\/h2>\n
      \u73b0\u5728\uff0c\u6211\u4eec\u5df2\u7ecf\u53ef\u4ee5\u53bb\u5199 eq \u51fd\u6570\u7684\u7b2c\u4e00\u7248\u4e86\u3002<\/p>\n
      <\/p>\n
      \/\/ eq \u7b2c\u4e00\u7248<\/span>\n\/\/ \u7528\u6765\u8fc7\u6ee4\u6389\u7b80\u5355\u7684\u7c7b\u578b\u6bd4\u8f83\uff0c\u590d\u6742\u7684\u5bf9\u8c61\u4f7f\u7528 deepEq \u51fd\u6570\u8fdb\u884c\u5904\u7406<\/span>\nfunction<\/span> eq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span> {<\/span>\n\n    \/\/ === \u7ed3\u679c\u4e3a true \u7684\u533a\u522b\u51fa +0 \u548c -0<\/span>\n    if<\/span> (<\/span>a<\/span> ===<\/span> b<\/span>)<\/span> return<\/span> a<\/span> !==<\/span> 0<\/span> ||<\/span> 1<\/span> \/<\/span> a<\/span> ===<\/span> 1<\/span> \/<\/span> b<\/span>;<\/span>\n\n    \/\/ typeof null \u7684\u7ed3\u679c\u4e3a object \uff0c\u8fd9\u91cc\u505a\u5224\u65ad\uff0c\u662f\u4e3a\u4e86\u8ba9\u6709 null \u7684\u60c5\u51b5\u5c3d\u65e9\u9000\u51fa\u51fd\u6570<\/span>\n    if<\/span> (<\/span>a<\/span> ==<\/span> null<\/span> ||<\/span> b<\/span> ==<\/span> null<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n\n    \/\/ \u5224\u65ad NaN<\/span>\n    if<\/span> (<\/span>a<\/span> !==<\/span> a<\/span>)<\/span> return<\/span> b<\/span> !==<\/span> b<\/span>;<\/span>\n\n    \/\/ \u5224\u65ad\u53c2\u6570 a \u7c7b\u578b\uff0c\u5982\u679c\u662f\u57fa\u672c\u7c7b\u578b\uff0c\u5728\u8fd9\u91cc\u53ef\u4ee5\u76f4\u63a5\u8fd4\u56de false<\/span>\n    var<\/span> type<\/span> =<\/span> typeof<\/span> a<\/span>;<\/span>\n    if<\/span> (<\/span>type<\/span> !==<\/span> 'function'<\/span> &&<\/span> type<\/span> !==<\/span> 'object'<\/span> &&<\/span> typeof<\/span> b<\/span> !=<\/span> 'object'<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n\n    \/\/ \u66f4\u590d\u6742\u7684\u5bf9\u8c61\u4f7f\u7528 deepEq \u51fd\u6570\u8fdb\u884c\u6df1\u5ea6\u6bd4\u8f83<\/span>\n    return<\/span> deepEq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span>;<\/span>\n}<\/span>;<\/span><\/pre>\n<\/div>\n
      \u4e5f\u8bb8\u4f60\u4f1a\u597d\u5947\u662f\u4e0d\u662f\u5c11\u4e86\u4e00\u4e2a typeof b !== function<\/code>?<\/p>\n
      \u8bd5\u60f3\u5982\u679c\u6211\u4eec\u6dfb\u52a0\u4e0a\u4e86\u8fd9\u53e5\uff0c\u5f53 a \u662f\u57fa\u672c\u7c7b\u578b\uff0c\u800c b \u662f\u51fd\u6570\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u8fdb\u5165 deepEq \u51fd\u6570\uff0c\u800c\u53bb\u6389\u8fd9\u4e00\u53e5\uff0c\u5c31\u4f1a\u8fdb\u5165\u76f4\u63a5\u8fdb\u5165 false\uff0c\u5b9e\u9645\u4e0a \u57fa\u672c\u7c7b\u578b\u548c\u51fd\u6570\u80af\u5b9a\u662f\u4e0d\u4f1a\u76f8\u7b49\u7684\uff0c\u6240\u4ee5\u8fd9\u6837\u505a\u4ee3\u7801\u53c8\u5c11\uff0c\u53c8\u53ef\u4ee5\u8ba9\u4e00\u79cd\u60c5\u51b5\u66f4\u65e9\u9000\u51fa\u3002<\/p>\n
      String \u5bf9\u8c61<\/h2>\n
      \u73b0\u5728\u6211\u4eec\u5f00\u59cb\u5199 deepEq \u51fd\u6570\uff0c\u4e00\u4e2a\u8981\u5904\u7406\u7684\u91cd\u5927\u96be\u9898\u5c31\u662f ‘Curly’ \u548c new String(‘Curly’) \u5982\u4f55\u5224\u65ad\u6210\u76f8\u7b49\uff1f<\/p>\n
      \u4e24\u8005\u7684\u7c7b\u578b\u90fd\u4e0d\u4e00\u6837\u5450\uff01\u4e0d\u4fe1\u6211\u4eec\u770b typeof \u7684\u64cd\u4f5c\u7ed3\u679c\uff1a<\/p>\n
      <\/p>\n
      console<\/span>.<\/span>log<\/span>(<\/span>typeof<\/span> 'Curly'<\/span>)<\/span>;<\/span> \/\/ string<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>typeof<\/span> new<\/span> String<\/span>(<\/span>'Curly'<\/span>)<\/span>)<\/span>;<\/span> \/\/ object<\/span><\/pre>\n<\/div>\n
      \u53ef\u662f\u6211\u4eec\u5728\u300aJavaScript\u4e13\u9898\u4e4b\u7c7b\u578b\u5224\u65ad\u4e0a\u300b<\/a>\u4e2d\u8fd8\u5b66\u4e60\u8fc7\u66f4\u591a\u7684\u65b9\u6cd5\u5224\u65ad\u7c7b\u578b\uff0c\u6bd4\u5982 Object.prototype.toString\uff1a<\/p>\n
      <\/p>\n
      var<\/span> toString<\/span> =<\/span> Object<\/span>.<\/span>prototype<\/span>.<\/span>toString<\/span>;<\/span>\ntoString<\/span>.<\/span>call<\/span>(<\/span>'Curly'<\/span>)<\/span>;<\/span> \/\/ \"[object String]\"<\/span>\ntoString<\/span>.<\/span>call<\/span>(<\/span>new<\/span> String<\/span>(<\/span>'Curly'<\/span>)<\/span>)<\/span>;<\/span> \/\/ \"[object String]\"<\/span><\/pre>\n<\/div>\n
      \u795e\u5947\u7684\u662f\u4f7f\u7528 toString \u65b9\u6cd5\u4e24\u8005\u5224\u65ad\u7684\u7ed3\u679c\u5374\u662f\u4e00\u81f4\u7684\uff0c\u53ef\u662f\u5c31\u7b97\u77e5\u9053\u4e86\u8fd9\u4e00\u70b9\uff0c\u8fd8\u662f\u4e0d\u77e5\u9053\u5982\u4f55\u5224\u65ad\u5b57\u7b26\u4e32\u548c\u5b57\u7b26\u4e32\u5305\u88c5\u5bf9\u8c61\u662f\u76f8\u7b49\u7684\u5462\uff1f<\/p>\n
      \u90a3\u6211\u4eec\u5229\u7528\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\u5462\uff1f<\/p>\n
      \n
      console<\/span>.<\/span>log<\/span>(<\/span>'Curly'<\/span> +<\/span> ''<\/span> ===<\/span> new<\/span> String<\/span>(<\/span>'Curly'<\/span>)<\/span> +<\/span> ''<\/span>)<\/span>;<\/span> \/\/ true<\/span><\/pre>\n<\/div>\n
      \u770b\u6765\u6211\u4eec\u5df2\u7ecf\u6709\u4e86\u601d\u8def\uff1a\u5982\u679c a \u548c b \u7684 Object.prototype.toString\u7684\u7ed3\u679c\u4e00\u81f4\uff0c\u5e76\u4e14\u90fd\u662f”[object String]”\uff0c\u90a3\u6211\u4eec\u5c31\u4f7f\u7528 ” + a === ” + b \u8fdb\u884c\u5224\u65ad\u3002<\/p>\n
      \u53ef\u662f\u4e0d\u6b62\u6709 String \u5bf9\u8c61\u5450\uff0cBoolean\u3001Number\u3001RegExp\u3001Date\u5462\uff1f<\/p>\n
      \u66f4\u591a\u5bf9\u8c61<\/h2>\n
      \u8ddf String \u540c\u6837\u7684\u601d\u8def\uff0c\u5229\u7528\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\u3002<\/p>\n
      Boolean<\/strong><\/p>\n
      <\/p>\n
      var<\/span> a<\/span> =<\/span> true<\/span>;<\/span>\nvar<\/span> b<\/span> =<\/span> new<\/span> Boolean<\/span>(<\/span>true<\/span>)<\/span>;<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>+<\/span>a<\/span> ===<\/span> +<\/span>b<\/span>)<\/span> \/\/ true<\/span><\/pre>\n<\/div>\n
      Date<\/strong><\/p>\n
      <\/p>\n
      var<\/span> a<\/span> =<\/span> new<\/span> Date<\/span>(<\/span>2009<\/span>,<\/span> 9<\/span>,<\/span> 25<\/span>)<\/span>;<\/span>\nvar<\/span> b<\/span> =<\/span> new<\/span> Date<\/span>(<\/span>2009<\/span>,<\/span> 9<\/span>,<\/span> 25<\/span>)<\/span>;<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>+<\/span>a<\/span> ===<\/span> +<\/span>b<\/span>)<\/span> \/\/ true<\/span><\/pre>\n<\/div>\n
      RegExp<\/strong><\/p>\n
      <\/p>\n
      var<\/span> a<\/span> =<\/span> \/<\/span>a\/<\/span>i<\/span>;<\/span>\nvar<\/span> b<\/span> =<\/span> new<\/span> RegExp<\/span>(<\/span>\/<\/span>a\/<\/span>i<\/span>)<\/span>;<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>''<\/span> +<\/span> a<\/span> ===<\/span> ''<\/span> +<\/span> b<\/span>)<\/span> \/\/ true<\/span><\/pre>\n<\/div>\n
      Number<\/strong><\/p>\n
      <\/p>\n
      var<\/span> a<\/span> =<\/span> 1<\/span>;<\/span>\nvar<\/span> b<\/span> =<\/span> new<\/span> Number<\/span>(<\/span>1<\/span>)<\/span>;<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>+<\/span>a<\/span> ===<\/span> +<\/span>b<\/span>)<\/span> \/\/ true<\/span><\/pre>\n<\/div>\n
      \u55ef\u54fc\uff1f\u4f60\u786e\u5b9a Number \u80fd\u8fd9\u4e48\u7b80\u5355\u7684\u5224\u65ad\uff1f<\/p>\n
      <\/p>\n
      var<\/span> a<\/span> =<\/span> Number<\/span>(<\/span>NaN<\/span>)<\/span>;<\/span>\nvar<\/span> b<\/span> =<\/span> Number<\/span>(<\/span>NaN<\/span>)<\/span>;<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>+<\/span>a<\/span> ===<\/span> +<\/span>b<\/span>)<\/span>;<\/span> \/\/ false<\/span><\/pre>\n<\/div>\n
      \u53ef\u662f a \u548c b \u5e94\u8be5\u88ab\u5224\u65ad\u6210 true \u7684\u5450~<\/p>\n
      \u90a3\u4e48\u6211\u4eec\u5c31\u6539\u6210\u8fd9\u6837\uff1a<\/p>\n
      <\/p>\n
      var<\/span> a<\/span> =<\/span> Number<\/span>(<\/span>NaN<\/span>)<\/span>;<\/span>\nvar<\/span> b<\/span> =<\/span> Number<\/span>(<\/span>NaN<\/span>)<\/span>;<\/span>\n\nfunction<\/span> eq<\/span>(<\/span>)<\/span> {<\/span>\n    \/\/ \u5224\u65ad Number(NaN) Object(NaN) \u7b49\u60c5\u51b5<\/span>\n    if<\/span> (<\/span>+<\/span>a<\/span> !==<\/span> +<\/span>a<\/span>)<\/span> return<\/span> +<\/span>b<\/span> !==<\/span> +<\/span>b<\/span>;<\/span>\n    \/\/ \u5176\u4ed6\u5224\u65ad ...<\/span>\n}<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>eq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span>)<\/span>;<\/span> \/\/ true<\/span><\/pre>\n<\/div>\n
      deepEq \u51fd\u6570<\/h2>\n
      \u73b0\u5728\u6211\u4eec\u53ef\u4ee5\u5199\u4e00\u70b9 deepEq \u51fd\u6570\u4e86\u3002<\/p>\n
      <\/p>\n
      var<\/span> toString<\/span> =<\/span> Object<\/span>.<\/span>prototype<\/span>.<\/span>toString<\/span>;<\/span>\n\nfunction<\/span> deepEq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span> {<\/span>\n    var<\/span> className<\/span> =<\/span> toString<\/span>.<\/span>call<\/span>(<\/span>a<\/span>)<\/span>;<\/span>\n    if<\/span> (<\/span>className<\/span> !==<\/span> toString<\/span>.<\/span>call<\/span>(<\/span>b<\/span>)<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n\n    switch<\/span> (<\/span>className<\/span>)<\/span> {<\/span>\n        case<\/span> '[object RegExp]'<\/span>:\n        case<\/span> '[object String]'<\/span>:\n            return<\/span> ''<\/span> +<\/span> a<\/span> ===<\/span> ''<\/span> +<\/span> b<\/span>;<\/span>\n        case<\/span> '[object Number]'<\/span>:\n            if<\/span> (<\/span>+<\/span>a<\/span> !==<\/span> +<\/span>a<\/span>)<\/span> return<\/span> +<\/span>b<\/span> !==<\/span> +<\/span>b<\/span>;<\/span>\n            return<\/span> +<\/span>a<\/span> ===<\/span> 0<\/span> ? 1<\/span> \/<\/span> +<\/span>a<\/span> ===<\/span> 1<\/span> \/<\/span> b<\/span> : +<\/span>a<\/span> ===<\/span> +<\/span>b<\/span>;<\/span>\n      case<\/span> '[object Date]'<\/span>:\n      case<\/span> '[object Boolean]'<\/span>:\n            return<\/span> +<\/span>a<\/span> ===<\/span> +<\/span>b<\/span>;<\/span>\n    }<\/span>\n\n    \/\/ \u5176\u4ed6\u5224\u65ad<\/span>\n}<\/span><\/pre>\n<\/div>\n
      \u6784\u9020\u51fd\u6570\u5b9e\u4f8b<\/h2>\n
      \u6211\u4eec\u770b\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
      <\/p>\n
      function<\/span> Person<\/span>(<\/span>)<\/span> {<\/span>\n    this<\/span>.<\/span>name<\/span> =<\/span> name<\/span>;<\/span>\n}<\/span>\n\nfunction<\/span> Animal<\/span>(<\/span>)<\/span> {<\/span>\n    this<\/span>.<\/span>name<\/span> =<\/span> name<\/span>\n}<\/span>\n\nvar<\/span> person<\/span> =<\/span> new<\/span> Person<\/span>(<\/span>'Kevin'<\/span>)<\/span>;<\/span>\nvar<\/span> animal<\/span> =<\/span> new<\/span> Animal<\/span>(<\/span>'Kevin'<\/span>)<\/span>;<\/span>\n\neq<\/span>(<\/span>person<\/span>,<\/span> animal<\/span>)<\/span> \/\/ ???<\/span><\/pre>\n<\/div>\n
      \u867d\u7136 person<\/code> \u548c animal<\/code> \u90fd\u662f {name: 'Kevin'}<\/code>\uff0c\u4f46\u662f person<\/code> \u548c animal<\/code> \u5c5e\u4e8e\u4e0d\u540c\u6784\u9020\u51fd\u6570\u7684\u5b9e\u4f8b\uff0c\u4e3a\u4e86\u505a\u51fa\u533a\u5206\uff0c\u6211\u4eec\u8ba4\u4e3a\u662f\u4e0d\u540c\u7684\u5bf9\u8c61\u3002<\/p>\n
      \u5982\u679c\u4e24\u4e2a\u5bf9\u8c61\u6240\u5c5e\u7684\u6784\u9020\u51fd\u6570\u5bf9\u8c61\u4e0d\u540c\uff0c\u4e24\u4e2a\u5bf9\u8c61\u5c31\u4e00\u5b9a\u4e0d\u76f8\u7b49\u5417\uff1f<\/p>\n
      \u5e76\u4e0d\u4e00\u5b9a\uff0c\u6211\u4eec\u518d\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
      <\/p>\n
      var<\/span> attrs<\/span> =<\/span> Object<\/span>.<\/span>create<\/span>(<\/span>null<\/span>)<\/span>;<\/span>\nattrs<\/span>.<\/span>name<\/span> =<\/span> \"Bob\"<\/span>;<\/span>\neq<\/span>(<\/span>attrs<\/span>,<\/span> {<\/span>name<\/span>: \"Bob\"<\/span>}<\/span>)<\/span>;<\/span> \/\/ ???<\/span><\/pre>\n<\/div>\n
      \u5c3d\u7ba1 attrs<\/code> \u6ca1\u6709\u539f\u578b\uff0c{name: \"Bob\"}<\/code> \u7684\u6784\u9020\u51fd\u6570\u662f Object<\/code>\uff0c\u4f46\u662f\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u53ea\u8981\u4ed6\u4eec\u6709\u7740\u76f8\u540c\u7684\u952e\u503c\u5bf9\uff0c\u6211\u4eec\u4f9d\u7136\u8ba4\u4e3a\u662f\u76f8\u7b49\u3002<\/p>\n
      \u4ece\u51fd\u6570\u8bbe\u8ba1\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u6211\u4eec\u4e0d\u5e94\u8be5\u8ba9\u4ed6\u4eec\u76f8\u7b49\uff0c\u4f46\u662f\u4ece\u5b9e\u8df5\u7684\u89d2\u5ea6\uff0c\u6211\u4eec\u8ba9\u4ed6\u4eec\u76f8\u7b49\uff0c\u6240\u4ee5\u76f8\u7b49\u5c31\u662f\u4e00\u4ef6\u5982\u6b64\u968f\u610f\u7684\u4e8b\u60c5\u5417\uff1f\uff01\u5bf9\u554a\uff0c\u6211\u4e5f\u5728\u60f3\uff1aundersocre\uff0c\u4f60\u600e\u4e48\u80fd\u5982\u6b64\u968f\u610f\u5462\uff01\uff01\uff01<\/p>\n
      \u54ce\uff0c\u5410\u69fd\u5b8c\u4e86\uff0c\u6211\u4eec\u8fd8\u662f\u8981\u63a5\u7740\u5199\u8fd9\u4e2a\u76f8\u7b49\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u5148\u505a\u4e2a\u5224\u65ad\uff0c\u5bf9\u4e8e\u4e0d\u540c\u6784\u9020\u51fd\u6570\u4e0b\u7684\u5b9e\u4f8b\u76f4\u63a5\u8fd4\u56de false\u3002<\/p>\n
      <\/p>\n
      function<\/span> isFunction<\/span>(<\/span>obj<\/span>)<\/span> {<\/span>\n    return<\/span> toString<\/span>.<\/span>call<\/span>(<\/span>obj<\/span>)<\/span> ===<\/span> '[object Function]'<\/span>\n}<\/span>\n\nfunction<\/span> deepEq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span> {<\/span>\n    \/\/ \u63a5\u7740\u4e0a\u9762\u7684\u5185\u5bb9<\/span>\n    var<\/span> areArrays<\/span> =<\/span> className<\/span> ===<\/span> '[object Array]'<\/span>;<\/span>\n    \/\/ \u4e0d\u662f\u6570\u7ec4<\/span>\n    if<\/span> (<\/span>!<\/span>areArrays<\/span>)<\/span> {<\/span>\n        \/\/ \u8fc7\u6ee4\u6389\u4e24\u4e2a\u51fd\u6570\u7684\u60c5\u51b5<\/span>\n        if<\/span> (<\/span>typeof<\/span> a<\/span> !=<\/span> 'object'<\/span> ||<\/span> typeof<\/span> b<\/span> !=<\/span> 'object'<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n\n        var<\/span> aCtor<\/span> =<\/span> a<\/span>.<\/span>constructor<\/span>,<\/span> bCtor<\/span> =<\/span> b<\/span>.<\/span>constructor<\/span>;<\/span>\n        \/\/ aCtor \u548c bCtor \u5fc5\u987b\u90fd\u5b58\u5728\u5e76\u4e14\u90fd\u4e0d\u662f Object \u6784\u9020\u51fd\u6570\u7684\u60c5\u51b5\u4e0b\uff0caCtor \u4e0d\u7b49\u4e8e bCtor\uff0c \u90a3\u8fd9\u4e24\u4e2a\u5bf9\u8c61\u5c31\u771f\u7684\u4e0d\u76f8\u7b49\u5566<\/span>\n        if<\/span> (<\/span>aCtor<\/span> !==<\/span> bCtor<\/span> &&<\/span> !<\/span>(<\/span>isFunction<\/span>(<\/span>aCtor<\/span>)<\/span> &&<\/span> aCtor<\/span> instanceof<\/span> aCtor<\/span> &&<\/span> isFunction<\/span>(<\/span>bCtor<\/span>)<\/span> &&<\/span> bCtor<\/span> instanceof<\/span> bCtor<\/span>)<\/span> &&<\/span> (<\/span>'constructor'<\/span> in<\/span> a<\/span> &&<\/span> 'constructor'<\/span> in<\/span> b<\/span>)<\/span>)<\/span> {<\/span>\n            return<\/span> false<\/span>;<\/span>\n        }<\/span>\n    }<\/span>\n\n    \/\/ \u4e0b\u9762\u8fd8\u6709\u597d\u591a\u5224\u65ad<\/span>\n}<\/span><\/pre>\n<\/div>\n
      \u6570\u7ec4\u76f8\u7b49<\/h2>\n
      \u73b0\u5728\u7ec8\u4e8e\u53ef\u4ee5\u8fdb\u5165\u6211\u4eec\u671f\u5f85\u5df2\u4e45\u7684\u6570\u7ec4\u548c\u5bf9\u8c61\u7684\u5224\u65ad\uff0c\u4e0d\u8fc7\u5176\u5b9e\u8fd9\u4e2a\u5f88\u7b80\u5355\uff0c\u5c31\u662f\u9012\u5f52\u904d\u5386\u4e00\u904d\u2026\u2026<\/p>\n
      <\/p>\n
      function<\/span> deepEq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span> {<\/span>\n    \/\/ \u518d\u63a5\u7740\u4e0a\u9762\u7684\u5185\u5bb9<\/span>\n    if<\/span> (<\/span>areArrays<\/span>)<\/span> {<\/span>\n\n        length<\/span> =<\/span> a<\/span>.<\/span>length<\/span>;<\/span>\n        if<\/span> (<\/span>length<\/span> !==<\/span> b<\/span>.<\/span>length<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n\n        while<\/span> (<\/span>length<\/span>--<\/span>)<\/span> {<\/span>\n            if<\/span> (<\/span>!<\/span>eq<\/span>(<\/span>a<\/span>[<\/span>length<\/span>]<\/span>,<\/span> b<\/span>[<\/span>length<\/span>]<\/span>)<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n         }<\/span>\n    }<\/span> \n    else<\/span> {<\/span>\n\n        var<\/span> keys<\/span> =<\/span> Object<\/span>.<\/span>keys<\/span>(<\/span>a<\/span>)<\/span>,<\/span> key<\/span>;<\/span>\n        length<\/span> =<\/span> keys<\/span>.<\/span>length<\/span>;<\/span>\n\n        if<\/span> (<\/span>Object<\/span>.<\/span>keys<\/span>(<\/span>b<\/span>)<\/span>.<\/span>length<\/span> !==<\/span> length<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n\n        while<\/span> (<\/span>length<\/span>--<\/span>)<\/span> {<\/span>\n            key<\/span> =<\/span> keys<\/span>[<\/span>length<\/span>]<\/span>;<\/span>\n            if<\/span> (<\/span>!<\/span>(<\/span>b<\/span>.<\/span>hasOwnProperty<\/span>(<\/span>key<\/span>)<\/span> &&<\/span> eq<\/span>(<\/span>a<\/span>[<\/span>key<\/span>]<\/span>,<\/span> b<\/span>[<\/span>key<\/span>]<\/span>)<\/span>)<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n        }<\/span>\n    }<\/span>\n    return<\/span> true<\/span>;<\/span>\n\n}<\/span><\/pre>\n<\/div>\n
      \u5faa\u73af\u5f15\u7528<\/h2>\n
      \u5982\u679c\u89c9\u5f97\u8fd9\u5c31\u7ed3\u675f\u4e86\uff0c\u7b80\u76f4\u662f\u592a\u5929\u771f\uff0c\u56e0\u4e3a\u6700\u96be\u7684\u90e8\u5206\u624d\u7ec8\u4e8e\u8981\u5f00\u59cb\uff0c\u8fd9\u4e2a\u95ee\u9898\u5c31\u662f\u5faa\u73af\u5f15\u7528\uff01<\/p>\n
      \u4e3e\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a<\/p>\n
      <\/p>\n
      a<\/span> =<\/span> {<\/span>abc<\/span>: null<\/span>}<\/span>;<\/span>\nb<\/span> =<\/span> {<\/span>abc<\/span>: null<\/span>}<\/span>;<\/span>\na<\/span>.<\/span>abc<\/span> =<\/span> a<\/span>;<\/span>\nb<\/span>.<\/span>abc<\/span> =<\/span> b<\/span>;<\/span>\n\neq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span><\/pre>\n<\/div>\n
      \u518d\u590d\u6742\u4e00\u70b9\u7684\uff0c\u6bd4\u5982\uff1a<\/p>\n
      <\/p>\n
      a<\/span> =<\/span> {<\/span>foo<\/span>: {<\/span>b<\/span>: {<\/span>foo<\/span>: {<\/span>c<\/span>: {<\/span>foo<\/span>: null<\/span>}<\/span>}<\/span>}<\/span>}<\/span>}<\/span>;<\/span>\nb<\/span> =<\/span> {<\/span>foo<\/span>: {<\/span>b<\/span>: {<\/span>foo<\/span>: {<\/span>c<\/span>: {<\/span>foo<\/span>: null<\/span>}<\/span>}<\/span>}<\/span>}<\/span>}<\/span>;<\/span>\na<\/span>.<\/span>foo<\/span>.<\/span>b<\/span>.<\/span>foo<\/span>.<\/span>c<\/span>.<\/span>foo<\/span> =<\/span> a<\/span>;<\/span>\nb<\/span>.<\/span>foo<\/span>.<\/span>b<\/span>.<\/span>foo<\/span>.<\/span>c<\/span>.<\/span>foo<\/span> =<\/span> b<\/span>;<\/span>\n\neq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span><\/pre>\n<\/div>\n
      \u4e3a\u4e86\u7ed9\u5927\u5bb6\u6f14\u793a\u4e0b\u5faa\u73af\u5f15\u7528\uff0c\u5927\u5bb6\u53ef\u4ee5\u628a\u4e0b\u9762\u8fd9\u6bb5\u5df2\u7ecf\u7cbe\u7b80\u8fc7\u7684\u4ee3\u7801\u590d\u5236\u5230\u6d4f\u89c8\u5668\u4e2d\u5c1d\u8bd5\uff1a<\/p>\n
      <\/p>\n
      \/\/ demo<\/span>\nvar<\/span> a<\/span>,<\/span> b<\/span>;<\/span>\n\na<\/span> =<\/span> {<\/span> foo<\/span>: {<\/span> b<\/span>: {<\/span> foo<\/span>: {<\/span> c<\/span>: {<\/span> foo<\/span>: null<\/span> }<\/span> }<\/span> }<\/span> }<\/span> }<\/span>;<\/span>\nb<\/span> =<\/span> {<\/span> foo<\/span>: {<\/span> b<\/span>: {<\/span> foo<\/span>: {<\/span> c<\/span>: {<\/span> foo<\/span>: null<\/span> }<\/span> }<\/span> }<\/span> }<\/span> }<\/span>;<\/span>\na<\/span>.<\/span>foo<\/span>.<\/span>b<\/span>.<\/span>foo<\/span>.<\/span>c<\/span>.<\/span>foo<\/span> =<\/span> a<\/span>;<\/span>\nb<\/span>.<\/span>foo<\/span>.<\/span>b<\/span>.<\/span>foo<\/span>.<\/span>c<\/span>.<\/span>foo<\/span> =<\/span> b<\/span>;<\/span>\n\nfunction<\/span> eq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>,<\/span> aStack<\/span>,<\/span> bStack<\/span>)<\/span> {<\/span>\n    if<\/span> (<\/span>typeof<\/span> a<\/span> ==<\/span> 'number'<\/span>)<\/span> {<\/span>\n        return<\/span> a<\/span> ===<\/span> b<\/span>;<\/span>\n    }<\/span>\n\n    return<\/span> deepEq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span>\n}<\/span>\n\nfunction<\/span> deepEq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span> {<\/span>\n\n    var<\/span> keys<\/span> =<\/span> Object<\/span>.<\/span>keys<\/span>(<\/span>a<\/span>)<\/span>;<\/span>\n    var<\/span> length<\/span> =<\/span> keys<\/span>.<\/span>length<\/span>;<\/span>\n    var<\/span> key<\/span>;<\/span>\n\n    while<\/span> (<\/span>length<\/span>--<\/span>)<\/span> {<\/span>\n        key<\/span> =<\/span> keys<\/span>[<\/span>length<\/span>]<\/span>\n\n        \/\/ \u8fd9\u662f\u4e3a\u4e86\u8ba9\u4f60\u770b\u5230\u4ee3\u7801\u5176\u5b9e\u4e00\u76f4\u5728\u6267\u884c<\/span>\n        console<\/span>.<\/span>log<\/span>(<\/span>a<\/span>[<\/span>key<\/span>]<\/span>,<\/span> b<\/span>[<\/span>key<\/span>]<\/span>)<\/span>\n\n        if<\/span> (<\/span>!<\/span>eq<\/span>(<\/span>a<\/span>[<\/span>key<\/span>]<\/span>,<\/span> b<\/span>[<\/span>key<\/span>]<\/span>)<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n    }<\/span>\n\n    return<\/span> true<\/span>;<\/span>\n\n}<\/span>\n\neq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span><\/pre>\n<\/div>\n
      \u55ef\uff0c\u4ee5\u4e0a\u7684\u4ee3\u7801\u662f\u6b7b\u5faa\u73af\u3002<\/p>\n
      \u90a3\u4e48\uff0c\u6211\u4eec\u53c8\u8be5\u5982\u4f55\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u5462\uff1funderscore \u7684\u601d\u8def\u662f eq \u7684\u65f6\u5019\uff0c\u591a\u4f20\u9012\u4e24\u4e2a\u53c2\u6570\u4e3a aStack \u548c bStack\uff0c\u7528\u6765\u50a8\u5b58 a \u548c b \u9012\u5f52\u6bd4\u8f83\u8fc7\u7a0b\u4e2d\u7684 a \u548c b \u7684\u503c\uff0c\u548b\u8bf4\u7684\u8fd9\u4e48\u7ed5\u53e3\u5462\uff1f
      \n\u6211\u4eec\u76f4\u63a5\u770b\u4e2a\u7cbe\u7b80\u7684\u4f8b\u5b50\uff1a<\/p>\n
      <\/p>\n
      var<\/span> a<\/span>,<\/span> b<\/span>;<\/span>\n\na<\/span> =<\/span> {<\/span> foo<\/span>: {<\/span> b<\/span>: {<\/span> foo<\/span>: {<\/span> c<\/span>: {<\/span> foo<\/span>: null<\/span> }<\/span> }<\/span> }<\/span> }<\/span> }<\/span>;<\/span>\nb<\/span> =<\/span> {<\/span> foo<\/span>: {<\/span> b<\/span>: {<\/span> foo<\/span>: {<\/span> c<\/span>: {<\/span> foo<\/span>: null<\/span> }<\/span> }<\/span> }<\/span> }<\/span> }<\/span>;<\/span>\na<\/span>.<\/span>foo<\/span>.<\/span>b<\/span>.<\/span>foo<\/span>.<\/span>c<\/span>.<\/span>foo<\/span> =<\/span> a<\/span>;<\/span>\nb<\/span>.<\/span>foo<\/span>.<\/span>b<\/span>.<\/span>foo<\/span>.<\/span>c<\/span>.<\/span>foo<\/span> =<\/span> b<\/span>;<\/span>\n\nfunction<\/span> eq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>,<\/span> aStack<\/span>,<\/span> bStack<\/span>)<\/span> {<\/span>\n    if<\/span> (<\/span>typeof<\/span> a<\/span> ==<\/span> 'number'<\/span>)<\/span> {<\/span>\n        return<\/span> a<\/span> ===<\/span> b<\/span>;<\/span>\n    }<\/span>\n\n    return<\/span> deepEq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>,<\/span> aStack<\/span>,<\/span> bStack<\/span>)<\/span>\n}<\/span>\n\nfunction<\/span> deepEq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>,<\/span> aStack<\/span>,<\/span> bStack<\/span>)<\/span> {<\/span>\n\n    aStack<\/span> =<\/span> aStack<\/span> ||<\/span> [<\/span>]<\/span>;<\/span>\n    bStack<\/span> =<\/span> bStack<\/span> ||<\/span> [<\/span>]<\/span>;<\/span>\n\n    var<\/span> length<\/span> =<\/span> aStack<\/span>.<\/span>length<\/span>;<\/span>\n\n    while<\/span> (<\/span>length<\/span>--<\/span>)<\/span> {<\/span>\n        if<\/span> (<\/span>aStack<\/span>[<\/span>length<\/span>]<\/span> ===<\/span> a<\/span>)<\/span> {<\/span>\n              return<\/span> bStack<\/span>[<\/span>length<\/span>]<\/span> ===<\/span> b<\/span>;<\/span>\n        }<\/span>\n    }<\/span>\n\n    aStack<\/span>.<\/span>push<\/span>(<\/span>a<\/span>)<\/span>;<\/span>\n    bStack<\/span>.<\/span>push<\/span>(<\/span>b<\/span>)<\/span>;<\/span>\n\n    var<\/span> keys<\/span> =<\/span> Object<\/span>.<\/span>keys<\/span>(<\/span>a<\/span>)<\/span>;<\/span>\n    var<\/span> length<\/span> =<\/span> keys<\/span>.<\/span>length<\/span>;<\/span>\n    var<\/span> key<\/span>;<\/span>\n\n    while<\/span> (<\/span>length<\/span>--<\/span>)<\/span> {<\/span>\n        key<\/span> =<\/span> keys<\/span>[<\/span>length<\/span>]<\/span>\n\n        console<\/span>.<\/span>log<\/span>(<\/span>a<\/span>[<\/span>key<\/span>]<\/span>,<\/span> b<\/span>[<\/span>key<\/span>]<\/span>,<\/span> aStack<\/span>,<\/span> bStack<\/span>)<\/span>\n\n        if<\/span> (<\/span>!<\/span>eq<\/span>(<\/span>a<\/span>[<\/span>key<\/span>]<\/span>,<\/span> b<\/span>[<\/span>key<\/span>]<\/span>,<\/span> aStack<\/span>,<\/span> bStack<\/span>)<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n    }<\/span>\n\n    \/\/ aStack.pop();<\/span>\n    \/\/ bStack.pop();<\/span>\n    return<\/span> true<\/span>;<\/span>\n\n}<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>eq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span>)<\/span><\/pre>\n<\/div>\n
      \u4e4b\u6240\u4ee5\u6ce8\u91ca\u6389 aStack.pop()<\/code>\u548cbStack.pop()<\/code>\u8fd9\u4e24\u53e5\uff0c\u662f\u4e3a\u4e86\u65b9\u4fbf\u5927\u5bb6\u67e5\u770b aStack bStack\u7684\u503c\u3002<\/p>\n
      \u6700\u7ec8\u7684 eq \u51fd\u6570<\/h2>\n
      \u6700\u7ec8\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
      <\/p>\n
      var<\/span> toString<\/span> =<\/span> Object<\/span>.<\/span>prototype<\/span>.<\/span>toString<\/span>;<\/span>\n\nfunction<\/span> isFunction<\/span>(<\/span>obj<\/span>)<\/span> {<\/span>\n    return<\/span> toString<\/span>.<\/span>call<\/span>(<\/span>obj<\/span>)<\/span> ===<\/span> '[object Function]'<\/span>\n}<\/span>\n\nfunction<\/span> eq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>,<\/span> aStack<\/span>,<\/span> bStack<\/span>)<\/span> {<\/span>\n\n    \/\/ === \u7ed3\u679c\u4e3a true \u7684\u533a\u522b\u51fa +0 \u548c -0<\/span>\n    if<\/span> (<\/span>a<\/span> ===<\/span> b<\/span>)<\/span> return<\/span> a<\/span> !==<\/span> 0<\/span> ||<\/span> 1<\/span> \/<\/span> a<\/span> ===<\/span> 1<\/span> \/<\/span> b<\/span>;<\/span>\n\n    \/\/ typeof null \u7684\u7ed3\u679c\u4e3a object \uff0c\u8fd9\u91cc\u505a\u5224\u65ad\uff0c\u662f\u4e3a\u4e86\u8ba9\u6709 null \u7684\u60c5\u51b5\u5c3d\u65e9\u9000\u51fa\u51fd\u6570<\/span>\n    if<\/span> (<\/span>a<\/span> ==<\/span> null<\/span> ||<\/span> b<\/span> ==<\/span> null<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n\n    \/\/ \u5224\u65ad NaN<\/span>\n    if<\/span> (<\/span>a<\/span> !==<\/span> a<\/span>)<\/span> return<\/span> b<\/span> !==<\/span> b<\/span>;<\/span>\n\n    \/\/ \u5224\u65ad\u53c2\u6570 a \u7c7b\u578b\uff0c\u5982\u679c\u662f\u57fa\u672c\u7c7b\u578b\uff0c\u5728\u8fd9\u91cc\u53ef\u4ee5\u76f4\u63a5\u8fd4\u56de false<\/span>\n    var<\/span> type<\/span> =<\/span> typeof<\/span> a<\/span>;<\/span>\n    if<\/span> (<\/span>type<\/span> !==<\/span> 'function'<\/span> &&<\/span> type<\/span> !==<\/span> 'object'<\/span> &&<\/span> typeof<\/span> b<\/span> !=<\/span> 'object'<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n\n    \/\/ \u66f4\u590d\u6742\u7684\u5bf9\u8c61\u4f7f\u7528 deepEq \u51fd\u6570\u8fdb\u884c\u6df1\u5ea6\u6bd4\u8f83<\/span>\n    return<\/span> deepEq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>,<\/span> aStack<\/span>,<\/span> bStack<\/span>)<\/span>;<\/span>\n}<\/span>;<\/span>\n\nfunction<\/span> deepEq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>,<\/span> aStack<\/span>,<\/span> bStack<\/span>)<\/span> {<\/span>\n\n    \/\/ a \u548c b \u7684\u5185\u90e8\u5c5e\u6027 [[class]] \u76f8\u540c\u65f6 \u8fd4\u56de true<\/span>\n    var<\/span> className<\/span> =<\/span> toString<\/span>.<\/span>call<\/span>(<\/span>a<\/span>)<\/span>;<\/span>\n    if<\/span> (<\/span>className<\/span> !==<\/span> toString<\/span>.<\/span>call<\/span>(<\/span>b<\/span>)<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n\n    switch<\/span> (<\/span>className<\/span>)<\/span> {<\/span>\n        case<\/span> '[object RegExp]'<\/span>:\n        case<\/span> '[object String]'<\/span>:\n            return<\/span> ''<\/span> +<\/span> a<\/span> ===<\/span> ''<\/span> +<\/span> b<\/span>;<\/span>\n        case<\/span> '[object Number]'<\/span>:\n            if<\/span> (<\/span>+<\/span>a<\/span> !==<\/span> +<\/span>a<\/span>)<\/span> return<\/span> +<\/span>b<\/span> !==<\/span> +<\/span>b<\/span>;<\/span>\n            return<\/span> +<\/span>a<\/span> ===<\/span> 0<\/span> ? 1<\/span> \/<\/span> +<\/span>a<\/span> ===<\/span> 1<\/span> \/<\/span> b<\/span> : +<\/span>a<\/span> ===<\/span> +<\/span>b<\/span>;<\/span>\n        case<\/span> '[object Date]'<\/span>:\n        case<\/span> '[object Boolean]'<\/span>:\n            return<\/span> +<\/span>a<\/span> ===<\/span> +<\/span>b<\/span>;<\/span>\n    }<\/span>\n\n    var<\/span> areArrays<\/span> =<\/span> className<\/span> ===<\/span> '[object Array]'<\/span>;<\/span>\n    \/\/ \u4e0d\u662f\u6570\u7ec4<\/span>\n    if<\/span> (<\/span>!<\/span>areArrays<\/span>)<\/span> {<\/span>\n        \/\/ \u8fc7\u6ee4\u6389\u4e24\u4e2a\u51fd\u6570\u7684\u60c5\u51b5<\/span>\n        if<\/span> (<\/span>typeof<\/span> a<\/span> !=<\/span> 'object'<\/span> ||<\/span> typeof<\/span> b<\/span> !=<\/span> 'object'<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n\n        var<\/span> aCtor<\/span> =<\/span> a<\/span>.<\/span>constructor<\/span>,<\/span>\n            bCtor<\/span> =<\/span> b<\/span>.<\/span>constructor<\/span>;<\/span>\n        \/\/ aCtor \u548c bCtor \u5fc5\u987b\u90fd\u5b58\u5728\u5e76\u4e14\u90fd\u4e0d\u662f Object \u6784\u9020\u51fd\u6570\u7684\u60c5\u51b5\u4e0b\uff0caCtor \u4e0d\u7b49\u4e8e bCtor\uff0c \u90a3\u8fd9\u4e24\u4e2a\u5bf9\u8c61\u5c31\u771f\u7684\u4e0d\u76f8\u7b49\u5566<\/span>\n        if<\/span> (<\/span>aCtor<\/span> !==<\/span> bCtor<\/span> &&<\/span> !<\/span>(<\/span>isFunction<\/span>(<\/span>aCtor<\/span>)<\/span> &&<\/span> aCtor<\/span> instanceof<\/span> aCtor<\/span> &&<\/span> isFunction<\/span>(<\/span>bCtor<\/span>)<\/span> &&<\/span> bCtor<\/span> instanceof<\/span> bCtor<\/span>)<\/span> &&<\/span> (<\/span>'constructor'<\/span> in<\/span> a<\/span> &&<\/span> 'constructor'<\/span> in<\/span> b<\/span>)<\/span>)<\/span> {<\/span>\n            return<\/span> false<\/span>;<\/span>\n        }<\/span>\n    }<\/span>\n\n\n    aStack<\/span> =<\/span> aStack<\/span> ||<\/span> [<\/span>]<\/span>;<\/span>\n    bStack<\/span> =<\/span> bStack<\/span> ||<\/span> [<\/span>]<\/span>;<\/span>\n    var<\/span> length<\/span> =<\/span> aStack<\/span>.<\/span>length<\/span>;<\/span>\n\n    \/\/ \u68c0\u67e5\u662f\u5426\u6709\u5faa\u73af\u5f15\u7528\u7684\u90e8\u5206<\/span>\n    while<\/span> (<\/span>length<\/span>--<\/span>)<\/span> {<\/span>\n        if<\/span> (<\/span>aStack<\/span>[<\/span>length<\/span>]<\/span> ===<\/span> a<\/span>)<\/span> {<\/span>\n            return<\/span> bStack<\/span>[<\/span>length<\/span>]<\/span> ===<\/span> b<\/span>;<\/span>\n        }<\/span>\n    }<\/span>\n\n    aStack<\/span>.<\/span>push<\/span>(<\/span>a<\/span>)<\/span>;<\/span>\n    bStack<\/span>.<\/span>push<\/span>(<\/span>b<\/span>)<\/span>;<\/span>\n\n    \/\/ \u6570\u7ec4\u5224\u65ad<\/span>\n    if<\/span> (<\/span>areArrays<\/span>)<\/span> {<\/span>\n\n        length<\/span> =<\/span> a<\/span>.<\/span>length<\/span>;<\/span>\n        if<\/span> (<\/span>length<\/span> !==<\/span> b<\/span>.<\/span>length<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n\n        while<\/span> (<\/span>length<\/span>--<\/span>)<\/span> {<\/span>\n            if<\/span> (<\/span>!<\/span>eq<\/span>(<\/span>a<\/span>[<\/span>length<\/span>]<\/span>,<\/span> b<\/span>[<\/span>length<\/span>]<\/span>,<\/span> aStack<\/span>,<\/span> bStack<\/span>)<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n        }<\/span>\n    }<\/span>\n    \/\/ \u5bf9\u8c61\u5224\u65ad<\/span>\n    else<\/span> {<\/span>\n\n        var<\/span> keys<\/span> =<\/span> Object<\/span>.<\/span>keys<\/span>(<\/span>a<\/span>)<\/span>,<\/span>\n            key<\/span>;<\/span>\n        length<\/span> =<\/span> keys<\/span>.<\/span>length<\/span>;<\/span>\n\n        if<\/span> (<\/span>Object<\/span>.<\/span>keys<\/span>(<\/span>b<\/span>)<\/span>.<\/span>length<\/span> !==<\/span> length<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n        while<\/span> (<\/span>length<\/span>--<\/span>)<\/span> {<\/span>\n\n            key<\/span> =<\/span> keys<\/span>[<\/span>length<\/span>]<\/span>;<\/span>\n            if<\/span> (<\/span>!<\/span>(<\/span>b<\/span>.<\/span>hasOwnProperty<\/span>(<\/span>key<\/span>)<\/span> &&<\/span> eq<\/span>(<\/span>a<\/span>[<\/span>key<\/span>]<\/span>,<\/span> b<\/span>[<\/span>key<\/span>]<\/span>,<\/span> aStack<\/span>,<\/span> bStack<\/span>)<\/span>)<\/span>)<\/span> return<\/span> false<\/span>;<\/span>\n        }<\/span>\n    }<\/span>\n\n    aStack<\/span>.<\/span>pop<\/span>(<\/span>)<\/span>;<\/span>\n    bStack<\/span>.<\/span>pop<\/span>(<\/span>)<\/span>;<\/span>\n    return<\/span> true<\/span>;<\/span>\n\n}<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>eq<\/span>(<\/span>0<\/span>,<\/span> 0<\/span>)<\/span>)<\/span> \/\/ true<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>eq<\/span>(<\/span>0<\/span>,<\/span> -<\/span>0<\/span>)<\/span>)<\/span> \/\/ false<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>eq<\/span>(<\/span>NaN<\/span>,<\/span> NaN<\/span>)<\/span>)<\/span>;<\/span> \/\/ true<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>eq<\/span>(<\/span>Number<\/span>(<\/span>NaN<\/span>)<\/span>,<\/span> Number<\/span>(<\/span>NaN<\/span>)<\/span>)<\/span>)<\/span>;<\/span> \/\/ true<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>eq<\/span>(<\/span>'Curly'<\/span>,<\/span> new<\/span> String<\/span>(<\/span>'Curly'<\/span>)<\/span>)<\/span>)<\/span>;<\/span> \/\/ true<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>eq<\/span>(<\/span>[<\/span>1<\/span>]<\/span>,<\/span> [<\/span>1<\/span>]<\/span>)<\/span>)<\/span>;<\/span> \/\/ true<\/span>\nconsole<\/span>.<\/span>log<\/span>(<\/span>eq<\/span>(<\/span>{<\/span> value<\/span>: 1<\/span> }<\/span>,<\/span> {<\/span> value<\/span>: 1<\/span> }<\/span>)<\/span>)<\/span>;<\/span> \/\/ true<\/span>\n\nvar<\/span> a<\/span>,<\/span> b<\/span>;<\/span>\n\na<\/span> =<\/span> {<\/span> foo<\/span>: {<\/span> b<\/span>: {<\/span> foo<\/span>: {<\/span> c<\/span>: {<\/span> foo<\/span>: null<\/span> }<\/span> }<\/span> }<\/span> }<\/span> }<\/span>;<\/span>\nb<\/span> =<\/span> {<\/span> foo<\/span>: {<\/span> b<\/span>: {<\/span> foo<\/span>: {<\/span> c<\/span>: {<\/span> foo<\/span>: null<\/span> }<\/span> }<\/span> }<\/span> }<\/span> }<\/span>;<\/span>\na<\/span>.<\/span>foo<\/span>.<\/span>b<\/span>.<\/span>foo<\/span>.<\/span>c<\/span>.<\/span>foo<\/span> =<\/span> a<\/span>;<\/span>\nb<\/span>.<\/span>foo<\/span>.<\/span>b<\/span>.<\/span>foo<\/span>.<\/span>c<\/span>.<\/span>foo<\/span> =<\/span> b<\/span>;<\/span>\n\nconsole<\/span>.<\/span>log<\/span>(<\/span>eq<\/span>(<\/span>a<\/span>,<\/span> b<\/span>)<\/span>)<\/span> \/\/ true<\/span><\/pre>\n<\/div>\n
      \u771f\u8ba9\u4eba\u611f\u53f9\u4e00\u53e5\uff1aeq \u4e0d\u6127\u662f underscore \u4e2d\u5b9e\u73b0\u4ee3\u7801\u884c\u6570\u6700\u591a\u7684\u51fd\u6570\u4e86\uff01<\/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\/41<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
      \u524d\u8a00 \u867d\u7136\u6807\u9898\u5199\u7684\u662f\u5982\u4f55\u5224\u65ad\u4e24\u4e2a\u5bf9\u8c61\u76f8\u7b49\uff0c\u4f46\u672c\u7bc7\u6211\u4eec\u4e0d\u4ec5\u4ec5\u5224\u65ad\u4e24\u4e2a\u5bf9\u8c61\u76f8\u7b49\uff0c\u5b9e\u9645\u4e0a\uff0c\u6211\u4eec\u8981\u505a\u5230\u7684\u662f\u5982\u4f55\u5224\u65ad\u4e24\u4e2a\u53c2\u6570\u76f8\u7b49\uff0c\u800c\u8fd9\u5fc5\u7136\u4f1a\u6d89\u53ca\u5230\u591a\u79cd\u7c7b\u578b\u7684\u5224\u65ad\u3002 \u76f8\u7b49 …<\/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-1372","post","type-post","status-publish","format-standard","hentry","category-learn"],"_links":{"self":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1372"}],"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=1372"}],"version-history":[{"count":1,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1372\/revisions"}],"predecessor-version":[{"id":1469,"href":"https:\/\/www.lccc.top\/index.php?rest_route=\/wp\/v2\/posts\/1372\/revisions\/1469"}],"wp:attachment":[{"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1372"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1372"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lccc.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1372"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}