{"id":618,"date":"2019-05-22T15:36:55","date_gmt":"2019-05-22T07:36:55","guid":{"rendered":"http:\/\/blog.xrhoujie.com\/?p=618"},"modified":"2019-11-23T14:54:53","modified_gmt":"2019-11-23T06:54:53","slug":"js%e9%a2%84%e8%a7%a3%e9%87%8a%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"http:\/\/blog.xrhoujie.com\/?p=618","title":{"rendered":"js\u9884\u89e3\u91ca\u5206\u6790(\u8f6c)"},"content":{"rendered":"

1 \u9884\u89e3\u91ca\u7684\u57fa\u672c\u6982\u5ff5<\/h3>\n

\u5728\u5f53\u524d\u7684\u4f5c\u7528\u57df\u4e2d\uff0cJS\u4ee3\u7801\u6267\u884c\u4e4b\u524d\uff0c\u6d4f\u89c8\u5668\u9996\u5148\u4f1a\u9ed8\u8ba4\u5730\u628a\u6240\u6709\u5e26var\u3001function<\/span>\u7684\u8fdb\u884c\u63d0\u524d\u7684\u58f0\u660e\u6216\u8005\u5b9a\u4e49<\/p>\n

\n
\n

\u7406\u89e3\u58f0\u660e(declare)\u548c\u5b9a\u4e49(defined)<\/h4>\n
var<\/span> num = 12<\/span>;\r\n\u58f0\u660e: var<\/span> num; \/\/\u544a\u8bc9\u6d4f\u89c8\u5668\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u6709\u4e00\u4e2anum\u7684\u53d8\u91cf<\/span>\r\n\r\n\u5b9a\u4e49: num = 12<\/span>(\u53d1\u751f\u5728\u4ee3\u7801\u6267\u884c\u8fc7\u7a0b\u4e2d \u4e0d\u5728\u9884\u89e3\u91ca\u4e2d);  \/\/\u7ed9\u53d8\u91cf\u8fdb\u884c\u8d4b\u503c<\/span>\r\n\r\nfunction<\/span> fn<\/span>() <\/span>{\r\n    console<\/span>.log(\"this is a test\"<\/span>);\r\n}\r\n\u51fd\u6570\u9884\u89e3\u91ca\r\nfn = xxxfff000; \r\n\u58f0\u660e: fn \/\/\u544a\u8bc9\u6d4f\u89c8\u5668\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u6709\u4e00\u4e2afn\u7684\u51fd\u6570<\/span>\r\n\u5b9a\u4e49: fn = xxxfff000; \/\/\u7ed9fn\u8d4b\u503c \u6307\u5411\u51fd\u6570\u7684\u5730\u5740<\/span>\r\n<\/code><\/pre>\n
\u6ce8\u91ca: \u6240\u4ee5\u5bf9\u4e8e\u5e26var \u548c function\u5173\u952e\u5b57\u7684\u5728\u9884\u89e3\u91ca\u7684\u65f6\u5019\u64cd\u4f5c\u8fd8\u662f\u4e0d\u4e00\u6837\u7684<\/strong> var: \u5bf9\u4e8e\u5e26var\u7684\u53d8\u91cf \u9884\u89e3\u91ca\u53ea\u4f1a\u58f0\u660e \u4e0d\u4f1a\u8fdb\u884c\u5b9a\u4e49<\/strong><\/span>\u00a0\uff0cfunction: \u5728\u9884\u89e3\u91ca\u7684\u65f6\u5019\u58f0\u660e+\u5b9a\u4e49 \u4e00\u8d77\u5b8c\u6210\u4e86<\/strong><\/span><\/span><\/p>\n<\/div>\n<\/div>\n
\n
2\u51fd\u6570\u9884\u89e3\u91ca(\u4ee3\u7801\u5185\u90e8)<\/h4>\n
function<\/span> fn<\/span>(num1,num2<\/span>) <\/span>{\r\n    var<\/span> total = num1 + num2;\r\n    console<\/span>.log(total);\r\n}\r\n\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre>\n
    \n
  • \u9884\u89e3\u91ca\uff0cfn\u51fd\u6570\u5185\u90e8\u6709\u5f62\u53c2\u4e24\u4e2a\uff0c\u79c1\u6709\u53d8\u91cf\u4e00\u4e2a<\/li>\n
  • \u4ee3\u7801\u6267\u884c total = num1+num2\uff1bconsole.log(total)\n
    \n
    JS\u4e2d\u5185\u5b58\u7684\u5206\u7c7b(\u9884\u89e3\u91ca\u53d1\u751f\u5728\u6808\u5185\u5b58)<\/h4>\n
    \/\/\u6808\u5185\u5b58:\u7528\u6765\u63d0\u4f9b\u4e00\u4e2a\u4f9bJS\u4ee3\u7801\u6267\u884c\u7684\u73af\u5883 --->\u4f5c\u7528\u57df(\u5168\u5c40\u4f5c\u7528\u57df\/\u79c1\u6709\u4f5c\u7528\u57df)<\/span>\r\n\/\/\u5806\u5185\u5b58:\u7528\u6765\u5b58\u50a8\u5f15\u7528\u6570\u636e\u7c7b\u578b\u7684\u503c --->\u5bf9\u8c61\u5b58\u50a8\u7684\u65f6\u5c5e\u6027\u540d\u548c\u5c5e\u6027\u503c<\/span>\r\n\/\/\u51fd\u6570\u5b58\u50a8\u7684\u662f\u4ee3\u7801\u5b57\u7b26\u4e32<\/span>\r\n<\/code><\/pre>\n
    \n
    \u5982\u4f55\u533a\u5206\u79c1\u6709\u53d8\u91cf\u548c\u5168\u5c40\u53d8\u91cf(\u4e3b\u8981\u7528\u6765\u5206\u6790\u51fd\u6570\u9884\u89e3\u91ca)<\/h4>\n
      \n
    • \u5728“\u5168\u5c40\u4f5c\u7528\u57df”<\/strong><\/span>\u4e0b\u58f0\u660e(\u9884\u89e3\u91ca\u7684\u65f6\u5019)\u7684\u53d8\u91cf\u662f\u5168\u5c40\u53d8\u91cf<\/li>\n
    • \u5728“\u79c1\u6709\u4f5c\u7528\u57df”<\/strong><\/span>\u4e2d\u58f0\u660e\u7684\u53d8\u91cf\u548c“\u51fd\u6570\u7684\u5f62\u53c2”<\/strong><\/span>\u90fd\u662f\u79c1\u6709\u7684\u53d8\u91cf<\/li>\n
    • \u5728\u79c1\u6709\u4f5c\u7528\u57df\u4e2d\uff0c\u6211\u4eec\u4ee3\u7801\u6267\u884c\u7684\u65f6\u5019\u9047\u5230\u4e86\u4e00\u4e2a\u53d8\u91cf\uff0c\u9996\u5148\u6211\u4eec\u8981\u786e\u8ba4\u5b83\u662f\u5426\u662f\u79c1\u6709\u7684\u53d8\u91cf\uff0c \u5982\u679c\u662f\u79c1\u6709\u7684\u53d8\u91cf\uff0c\u90a3\u4e48\u548c\u5916\u9762\u7684\u53d8\u91cf\u6ca1\u6709\u4efb\u4f55\u7684\u5173\u7cfb\uff0c\u5982\u679c\u4e0d\u662f\u79c1\u6709\u7684\uff0c\u5219\u5f80\u5f53\u524d\u4f5c\u7528\u57df\u7684 \u4e0a\u7ea7\u4f5c\u7528\u57df\u67e5\u627e\uff0c\u5982\u679c\u4e0a\u7ea7\u4f5c\u7528\u57df\u6ca1\u6709\u5219\u7ee7\u7eed\u67e5\u627e\uff0c\u4e00\u76f4\u627e\u5230window\u4e3a\u6b62 —>(“\u4f5c\u7528\u57df\u94fe”<\/strong><\/span>)<\/li>\n
    • \u5f53\u51fd\u6570\u6267\u884c\u7684\u65f6\u5019(\u76f4\u63a5\u76ee\u7684:\u8ba9\u51fd\u6570\u4f53\u4e2d\u7684\u4ee3\u7801\u6267\u884c)\uff0c\u9996\u5148\u4f1a\u5f62\u6210\u4e00\u4e2a\u65b0\u7684\u79c1\u6709\u4f5c\u7528\u57df\uff0c\u7136\u540e\u6309\u7167\u5982\u4e0b\u6b65\u9aa4\u6267\u884c: a:\u5982\u679c\u6709\u5f62\u53c2\uff0c\u5148\u7ed9\u5f62\u53c2\u8d4b\u503c b:\u8fdb\u884c\u79c1\u6709\u4f5c\u7528\u57df\u4e2d\u7684\u9884\u89e3\u91ca c:\u79c1\u6709\u4f5c\u7528\u57df\u4e2d\u7684\u4ee3\u7801\u4ece\u4e0a\u5230\u4e0b\u6267\u884c<\/li>\n
    • \u51fd\u6570\u5f62\u6210\u4e00\u4e2a\u65b0\u7684\u79c1\u6709\u4f5c\u7528\u57df\u4fdd\u62a4\u4e86\u91cc\u9762\u7684\u79c1\u6709\u53d8\u91cf\u4e0d\u53d7\u5916\u754c\u7684\u5f71\u54cd(\u5916\u9762\u4fee\u6539\u4e0d\u4e86\u79c1\u6709\u7684\uff0c\u79c1\u6709\u7684\u4e5f\u4fee\u6539\u4e0d\u4e86\u5916\u9762\u7684)\u5f62\u6210\u4e86“\u95ed\u5305”<\/strong><\/span> —>(\u4fdd\u62a4\u673a\u5236)<\/li>\n<\/ul>\n
      \n
      \n
      \u5168\u5c40\u4f5c\u7528\u57df\u4e2d\uff0c\u5e26var\u548c\u4e0d\u5e26var\u7684\u533a\u522b<\/h4>\n
        \n
      • \u533a\u522b1: \u5e26var\u7684\u53ef\u4ee5\u8fdb\u884c\u9884\u89e3\u91ca\uff0c\u6240\u4ee5\u5728\u8d4b\u503c\u7684\u524d\u9762\u6267\u884c\u4e0d\u4f1a\u62a5\u9519\uff0c\u4e0d\u5e26var\u7684\u662f\u4e0d\u80fd\u8fdb\u884c\u9884\u89e3\u91ca\u7684\uff0c\u5728\u524d\u9762\u6267\u884c\u4f1a\u62a5\u9519<\/li>\n
      • \u4ee3\u7801\u5982\u4e0b<\/li>\n<\/ul>\n
        console<\/span>.log(num);--->undefined<\/span>\r\nvar<\/span> num = 12<\/span>;\r\nconsole<\/span>.log(num2); --->\u76f4\u63a5\u62a5\u9519 \u56e0\u4e3anum2\u6ca1\u6709\u9884\u89e3\u91ca\r\nnum2=13<\/span>;<\/code><\/pre>\n<\/div>\n
        \n
        \n
          \n
        • \u533a\u522b2: \u770b\u4e0b\u8ff0\u4ee3\u7801<\/li>\n<\/ul>\n
          var<\/span> num = 12<\/span>;\r\nconsole<\/span>.log(num);\/\/12<\/span>\r\nnum2 = 12<\/span>;\r\nconsole<\/span>.log(num2) \/\/12 --->\u76f8\u5f53\u4e8ewindow.num2<\/span>\r\n\/\/\u5173\u7cfb:num2 = 12 --->\u76f8\u5f53\u4e8e\u7ed9window\u589e\u52a0\u4e86\u4e00\u4e2a\u53ebnum2\u7684\u5c5e\u6027\u540d\uff0c\u5c5e\u6027\u503c\u662f12<\/span>\r\n\/\/var num =12 --->\u76f8\u5f53\u4e8e\u7ed9\u5168\u5c40\u4f5c\u7528\u57df\u589e\u52a0\u4e86\u4e00\u4e2a\u5168\u5c40\u53d8\u91cfnum,\u4f46\u662f\u4e0d\u4ec5\u5982\u6b64\uff0c<\/span>\r\n\/\/\u5b83\u4e5f\u76f8\u5f53\u4e8e\u7ed9window\u589e\u52a0\u4e86\u4e00\u4e2a\u5c5e\u6027\u540dnum,\u5c5e\u6027\u503c\u662f12<\/span>\r\n\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre>\n
            \n
          • \u51fd\u6570\u5185\u90e8\u4e0d\u5e26var\u7684\u4ee3\u7801\u5982\u4e0b<\/li>\n<\/ul>\n
            var<\/span> total = 0<\/span>\uff1b\r\nfunction<\/span> fn<\/span>() <\/span>{\r\n    console<\/span>.log(total) \/\/ 0<\/span>\r\n    total = 100<\/span>;\/\/\u76f8\u5f53\u4e8e\u4fee\u6539\u4e86\u5168\u5c40\u53d8\u91cftotal<\/span>\r\n}\r\nfn();\r\nconsole<\/span>.log(total)\/\/--->100<\/span>\r\n\/\/\u6ce8\u91ca:\u79c1\u6709\u4f5c\u7528\u57df\u4e2d\u51fa\u73b0\u7684\u4e00\u4e2a\u53d8\u91cf\u4e0d\u662f\u79c1\u6709\u7684\uff0c\u5219\u5f80\u4e0a\u7ea7\u4f5c\u7528\u57df\u67e5\u627e\uff0c\u4e0a\u7ea7\u6ca1\u6709\u5219\u7ee7\u7eed\u5411\u4e0a\u67e5\u627e\uff0c\u4e00\u76f4\u627e\u5230window<\/span>\r\n\/\/\u5982\u679cwindow\u4e0b\u6ca1\u6709 \u5206\u4e24\u79cd\u60c5\u51b5:<\/span>\r\n\/\/1\u3001\u5982\u679c\u662f\u83b7\u53d6\u503c:console.log(total) -->\u76f4\u63a5\u62a5\u9519<\/span>\r\n\/\/2\u3001\u5982\u679c\u662f\u8bbe\u7f6e\u503c:total = 100;--->\u76f8\u5f53\u4e8e\u7ed9window\u52a0\u4e86total\u5c5e\u6027<\/span>\r\n\/\/3\u3001JS\u4e2d\u5982\u679c\u5728\u4e0d\u8fdb\u884c\u4efb\u4f55\u7279\u6b8a\u5904\u7406\u7684\u60c5\u51b5\u4e0b,\u4e0a\u8fb9\u7684\u4ee3\u7801\u62a5\u9519\uff0c\u4e0b\u8fb9\u7684\u4ee3\u7801\u90fd\u4e0d\u6267\u884c\u4e86<\/span>\r\n\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre>\n
            2.1.6 \u9884\u89e3\u91ca\u662f\u4e00\u79cd\u6beb\u65e0\u8282\u64cd\u7684\u673a\u5236<\/h4>\n
              \n
            • \u9884\u89e3\u91ca\u7684\u65f6\u5019\u4e0d\u7ba1\u4f60\u7684\u6761\u4ef6\u662f\u5426\u6210\u7acb\uff0c\u90fd\u8981\u628a\u5e26var\u7684\u8fdb\u884c\u63d0\u524d\u58f0\u660e<\/li>\n
            • \u5177\u4f53\u4ee3\u7801\u5982\u4e0b<\/li>\n<\/ul>\n
              if<\/span>(!(\"num\"<\/span> in<\/span> window<\/span>)) { \/\/===>if(false)<\/span>\r\n    var<\/span> num = 12<\/span>;\r\n}\r\nconsole<\/span>.log(num);\/\/--->\u5b9e\u9645\u8f93\u51faundefined<\/span>\r\n\/\/\u5206\u6790:\u4e0d\u7ba1if\u7684\u6761\u4ef6\u662f\u5426\u6210\u7acb \u90fd\u4f1a\u628a\u5e26var\u7684\u8fdb\u884c\u9884\u89e3\u91ca (var num = 12)<\/span>\r\n\/\/\u6240\u4ee5\"num\" in window \u662ftrue  !(\"num\" in window) --->false <\/span>\r\n\/\/if\u6761\u4ef6\u662ffalse  var num = 12 \u4e0d\u4f1a\u6267\u884c \u6240\u4ee5 console.log(num) \u662fundefined<\/span>\r\n\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre>\n
                \n
              • \u533f\u540d\u51fd\u6570\u4e4b\u51fd\u6570\u8868\u8fbe\u5f0f \u628a\u51fd\u6570\u5b9a\u4e49\u7684\u90e8\u5206\u5f53\u4f5c\u4e00\u4e2a\u503c\u8d4b\u7ed9\u6211\u4eec\u7684\u53d8\u91cf\/\u6216\u8005\u8d4b\u7ed9\u5143\u7d20\u7684\u67d0\u4e00\u4e2a\u4e8b\u4ef6<\/li>\n<\/ul>\n
                fn();\/\/====>fn \u662fundefined \u76f8\u5f53\u4e8e undefined()  \u62a5\u9519 uncaught TypeError: fn is not a function<\/span>\r\n\/\/window\u4e0b\u7684\u9884\u89e3\u91ca var fn; \u9884\u89e3\u91ca\u7684\u65f6\u5019\u53ea\u4f1a\u9884\u89e3\u91ca \"=\"(\u7b49\u53f7)\u5de6\u8fb9\u7684<\/span>\r\n\/\/\u53f3\u8fb9\u7684\u662f\u503c  \u4e0d\u53c2\u4e0e\u9884\u89e3\u91ca<\/span>\r\nvar<\/span> fn = function<\/span>() <\/span>{\r\n    console<\/span>.log(\"ok\"<\/span>);\r\n}\r\n\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre>\n
                  \n
                • \u81ea\u6267\u884c\u51fd\u6570 \u5b9a\u4e49\u548c\u6267\u884c\u4e00\u8d77\u5b8c\u6210\u7684<\/li>\n<\/ul>\n
                  \/\/\u81ea\u6267\u884c\u51fd\u6570\u5b9a\u4e49\u7684\u90a3\u4e2afunction\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e0b\u4e0d\u8fdb\u884c\u9884\u89e3\u91ca\uff0c\u5f53\u4ee3\u7801\u6267\u884c\u5230\u8fd9\u4e2a\u4f4d\u7f6e\u7684\u65f6\u5019\uff0c\u5b9a\u4e49\u548c\u6267\u884c\u4e00\u8d77\u5b8c\u6210\u4e86<\/span>\r\n\/\/\u81ea\u6267\u884c\u51fd\u6570\u76845\u79cd\u5f62\u5f0f<\/span>\r\n(function<\/span>(num<\/span>)<\/span>{})(100<\/span>);\/\/\u5e38\u7528\u5f62\u5f0f<\/span>\r\n~function<\/span>()<\/span>{}(100<\/span>);\r\n+function<\/span>()<\/span>{}(100<\/span>);\r\n-function<\/span>()<\/span>{}(100<\/span>);\r\n!function<\/span>()<\/span>{}(100<\/span>)\r\n\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre>\n
                    \n
                  • \u51fd\u6570\u5185\u90e8return\u76f8\u5173<\/li>\n<\/ul>\n
                    function<\/span> fn<\/span>() <\/span>{\r\n    console<\/span>.log(num);\/\/--->undefined<\/span>\r\n    return<\/span> function<\/span>() <\/span>{};\r\n    var<\/span> num = 100<\/span>;\r\n}\r\nfn();\r\n\/\/\u51fd\u6570\u4f53\u79cdreturn \u4e0b\u9762\u7684\u4ee3\u7801\u867d\u7136\u4e0d\u518d\u6267\u884c\u4e86\uff0c\u4f46\u662f\u9700\u8981\u8fdb\u884c\u9884\u89e3\u91ca<\/span>\r\n\/\/return \u540e\u8fb9\u8ddf\u7740\u7684\u662f\u6211\u4eec\u7684\u8fd4\u56de\u503c\uff0c\u6240\u4ee5\u4e0d\u8fdb\u884c\u9884\u89e3\u91ca<\/span>\r\n\u590d\u5236\u4ee3\u7801<\/span><\/code><\/pre>\n
                      \n
                    • \u9884\u89e3\u91ca\u7ecf\u5178\u4e60\u9898\u89e3\u6790<\/li>\n<\/ul>\n
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                      \u4f5c\u8005\uff1adafeige
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