{"rsdb":{"rid":"239284","subhead":"","postdate":"0","aid":"164929","fid":"107","uid":"1","topic":"1","content":"
\n

\u867d\u7136\u770b\u4e86\u591a\u6b21js\u51fd\u6570\u4f5c\u7528\u57df\u53ca\u53d8\u91cf\u63d0\u5347\u7684\u7406\u8bba\u77e5\u8bc6\uff0c\u4f46\u5c0f\u7f16\u4e5f\u662f\u4e00\u77e5\u534a\u89e3~<\/p> \n

\u8fd9\u51e0\u5929\u505a\u4e86\u51e0\u9053js\u5c0f\u9898\uff0c\u5bf9\u8fd9\u90e8\u5206\u8fdb\u884c\u4e86\u4ece\u65b0\u7684\u7406\u89e3\uff0c\u8fd8\u662f\u6709\u6240\u6536\u83b7\u7684~<\/p> \n

 <\/p> \n

\u4e3b\u8981\u53c2\u8003\u4e66\u7c4d\uff1a<\/span><\/p> \n

\u300a\u4f60\u4e0d\u77e5\u9053\u7684java<\/a> script\uff08\u4e0a\u5377\uff09\u300b\u7b2c\u4e00\u90e8\u5206<\/p> \n

\u300ajava<\/a> script\u9ad8\u7ea7\u7a0b\u5e8f\u8bbe\u8ba1\u300b\u7b2c\u56db\u7ae0 4.2 \u6267\u884c\u73af\u5883\u4e0e\u4f5c\u7528\u57df<\/p> \n

 <\/p> \n

\u7406\u89e3\u8981\u70b9\uff1a<\/span><\/p> \n

1. js\u5176\u5b9e\u662f\u4e00\u95e8\u7f16\u8bd1\u8bed\u8a00\uff0c\u4ee3\u7801\u7684\u6267\u884c\u5206\u4e3a\u4e24\u4e2a\u9636\u6bb5\uff1a\uff08\u300a\u4f60\u4e0d\u77e5\u9053\u7684java script\uff08\u4e0a\u5377\uff09\u300b\uff09<\/p> \n

a.\u7f16\u8bd1\u9636\u6bb5<\/p> \n

b.\u6267\u884c\u9636\u6bb5<\/p> \n

 <\/p> \n

2. \u4f5c\u7528\u57df\u5d4c\u5957\uff1a<\/p> \n

\u5728\u5f53\u524d\u4f5c\u7528\u57df\u4e2d\u65e0\u6cd5\u627e\u5230\u67d0\u4e2a\u53d8\u91cf\u65f6\uff0c\u5f15\u64ce\u5c31\u4f1a\u5728\u5916\u5c42\u5d4c\u5957\u4e2d\u7ee7\u7eed\u67e5\u627e\uff0c\u76f4\u5230\u627e\u5230\u8be5\u53d8\u91cf\uff0c\u6216\u662f\u62b5\u8fbe\u6700\u5916\u5c42\u4f5c\u7528\u57df\u4e3a\u6b62\u3002\uff08\u300a\u4f60\u4e0d\u77e5\u9053\u7684java script\uff08\u4e0a\u5377\uff09\u300b\uff09<\/p> \n

 <\/p> \n

3. \u5305\u62ec\u53d8\u91cf\u548c\u51fd\u6570\u5728\u5185\u7684\u6240\u6709\u58f0\u660e\u90fd\u4f1a\u5728\u4efb\u4f55\u4ee3\u7801\u88ab\u6267\u884c\u524d\u9996\u5148\u88ab\u5904\u7406\u3002\u53d8\u91cf\u53ca\u51fd\u6570\u58f0\u660e\u7684\u63d0\u5347\u4e5f\u662f\u5728\u8fd9\u4e2a\u9636\u6bb5\u3002<\/p> \n

\u6ce8\u610f\uff1a\uff081\uff09\u53d8\u91cf\u53ca\u51fd\u6570\u58f0\u660e\u7684\u63d0\u5347\u53ea\u662f\u63d0\u5347\u201c\u58f0\u660e\u201d\uff0c\u5e76\u4e0d\u4f1a\u63d0\u5347\u201c\u8d4b\u503c\u201d\uff0c\u8d4b\u503c\u662f\u5728\u51fd\u6570\u6267\u884c\u9636\u6bb5\u5b8c\u6210\u7684\u3002<\/p> \n

\u3000\u3000\u3000\uff082\uff09\u51fd\u6570\u8868\u8fbe\u5f0f\u4e0d\u80fd\u88ab\u63d0\u5347\u3002<\/p> \n

 <\/p> \n

4. \u58f0\u660e\u53d8\u91cf\uff1a\u4f7f\u7528var\u58f0\u660e\u7684\u53d8\u91cf\u4f1a\u81ea\u52a8\u88ab\u6dfb\u52a0\u5230\u6700\u8fd1\u7684\u73af\u5883\u4e2d\u3002\u6ca1\u6709\u4f7f\u7528var\u58f0\u660e\uff0c\u8be5\u53d8\u91cf\u4f1a\u81ea\u52a8\u88ab\u6dfb\u52a0\u5230\u5168\u5c40\u53d8\u91cf\u4e2d\u3002\uff08\u300ajava script\u9ad8\u7ea7\u7a0b\u5e8f\u8bbe\u8ba1\u300b\uff09<\/p> \n

\u6ce8\u610f\uff1a\u8fd9\u91cc\u7684\u6ca1\u6709\u4f7f\u7528var\u58f0\u660e\u6307\u7684\u662f\u4ece\u5f53\u524d\u4f5c\u7528\u57df\u5411\u4e0a\u5ef6\u4f38\u641c\u7d22\uff0c\u76f4\u5230\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u90fd\u6ca1\u6709\u627e\u5230\u8be5\u53d8\u91cf\u7684\u58f0\u660e\uff0c\u6b64\u65f6\u8be5\u53d8\u91cf\u624d\u4f1a\u81ea\u52a8\u88ab\u6dfb\u52a0\u5230\u5168\u5c40\u53d8\u91cf\u4e2d\u3002\uff08\u53c2\u8003\u4e0a\u9762\u7406\u89e3\u8981\u70b9\u201c2\u201d\uff09<\/p> \n

 <\/p> \n

\u597d\u5566\uff0c\u4ee5\u4e0b\u629b\u51fa\u9898\u76ee\uff0c\u53ef\u4ee5\u5148\u8bd5\u7740\u505a\u4e00\u4e0b\uff0c\u4f60\u7684\u7b54\u6848\u662f\u4ec0\u4e48 ^_^<\/p> \n

\u4e00.<\/p> \n

\n 
1<\/span> var<\/span> foo = 1;\n<\/span>2<\/span> function<\/span> bar( ) {\n<\/span>3<\/span>     foo=10;\n<\/span>4<\/span>     return<\/span> function<\/span> foo() { };\n<\/span>5<\/span> }\n<\/span>6<\/span> bar( );\n<\/span>7<\/span> console.log(foo);<\/pre> \n <\/div> \n 
\u4e8c.<\/p> \n 
 \n  
1<\/span> var<\/span> foo = 1;\n<\/span>2<\/span> function<\/span> bar() {\n<\/span>3<\/span>     foo = 10;            \n<\/span>4<\/span>     return<\/span>;\n<\/span>5<\/span>     function<\/span> foo() {};\n<\/span>6<\/span> }\n<\/span>7<\/span> bar();\n<\/span>8<\/span> console.log(foo);<\/pre> \n <\/div> \n 
\u4e09.<\/p> \n 
 \n  
1<\/span> var<\/span> a = 1;\n<\/span>2<\/span> function<\/span> fn() {\n<\/span>3<\/span>     console.log(a);\n<\/span>4<\/span>     var<\/span> a = 2;\n<\/span>5<\/span> }\n<\/span>6<\/span> fn();\n<\/span>7<\/span> console.log(a);<\/pre> \n <\/div> \n 
\u56db.<\/p> \n 
 \n  
1<\/span> var<\/span> a = 1;\n<\/span>2<\/span> function<\/span> fn(a) {\n<\/span>3<\/span>     console.log(a);\n<\/span>4<\/span>     var<\/span> a = 2;\n<\/span>5<\/span> }\n<\/span>6<\/span> fn(a);\n<\/span>7<\/span> console.log(a);<\/pre> \n <\/div> \n 
 <\/p> \n 
\u534e\u4e3d\u4e3d\u7684\u5206\u5272\u7ebf\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014<\/p> \n 
\u54c8\u54c8\uff0c\u662f\u4e0d\u662fso easy\uff0c\u4ee5\u4e0b\u662f\u5c0f\u7f16\u7684\u7406\u89e3\uff0c\u5982\u679c\u6709\u8bef\uff0c\u8fd8\u671b\u5927\u795e\u6307\u51fa\u5594 ^_^<\/p> \n 
\u4e00.<\/p> \n 
 \n  
1<\/span> var<\/span> foo = 1;\n<\/span>2<\/span> function<\/span> bar( ) {\n<\/span>3<\/span>     foo=10;\n<\/span>4<\/span>     return<\/span> function<\/span> foo() { };\n<\/span>5<\/span> }\n<\/span>6<\/span> bar( );\n<\/span>7<\/span> console.log(foo);<\/pre> \n <\/div> \n 
\u7406\u89e3\u8981\u70b9\uff1a<\/span><\/p> \n 
1. \u5728bar\uff08\uff09\u51fd\u6570\u4f5c\u7528\u57df\u4e2d\uff0cfoo \u53d8\u91cf\u5e76\u6ca1\u6709\u4f7f\u7528 var \u8fdb\u884c\u58f0\u660e \uff0c\u6240\u4ee5\u5728\u6267\u884c foo = 1\uff1b \u8bed\u53e5\u65f6\uff0c\u5f15\u64ce\u4f1a\u6cbf\u7740\u4f5c\u7528\u57df\u94fe\u5411\u4e0a\u67e5\u627e\uff0c\u7ed3\u679c\u5728\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u627e\u5230\u4e86 var foo\uff1b\u6b64\u65f6\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u7684 foo \u7684\u503c\u4e3a 1\uff1b\u6267\u884c\u4e86 bar\uff08\uff09 \u51fd\u6570\u4e2d\u7684 foo = 10\uff1b\u540e\uff0c\u6700\u7ec8\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u7684\u53d8\u91cf foo \u7684\u503c\u4e3a 10\uff1b<\/p> \n 
2. return function foo(){}; \u5728\u6b64\u5904\u662f\u4e00\u4e2a\u51fd\u6570\u8868\u8fbe\u5f0f\uff0c\u800c\u4e0d\u662f\u51fd\u6570\u58f0\u660e\uff0c\u6240\u4ee5\u4e0d\u5b58\u5728\u51fd\u6570\u58f0\u660e\u7684\u63d0\u5347\u3002<\/p> \n 
\u6240\u4ee5\uff1a<\/p> \n 
 \n  
1<\/span> var<\/span> foo = 1;\n<\/span>2<\/span> function<\/span> bar( ) {\n<\/span>3<\/span>     foo=10;\n<\/span>4<\/span>     return<\/span> function<\/span> foo() { };\n<\/span>5<\/span> }\n<\/span>6<\/span> bar( );\n<\/span>7<\/span> console.log(foo);\/\/<\/span>10<\/span><\/pre> \n <\/div> \n 
\u4ee5\u4e0b\u629b\u51fa\u9898\u4e00\u7684\u53d8\u5f62\u548c\u7b54\u6848\uff0c\u53ef\u4ee5\u81ea\u884c\u7406\u89e3\u5594 ^_^<\/p> \n 
 \n  
1<\/span> function<\/span> bar( ) {\n<\/span>2<\/span>      foo=10;\n<\/span>3<\/span>      return<\/span> function<\/span> foo() { };\n<\/span>4<\/span> }\n<\/span>5<\/span> bar( );\n<\/span>6<\/span> console.log(bar());\/\/<\/span>? foo() { }<\/span>\n7<\/span> console.log(foo);\/\/<\/span>10<\/span><\/pre> \n <\/div> \n 
 \n  
1<\/span> function<\/span> bar( ) {\n<\/span>2<\/span>      var<\/span> foo=10;\n<\/span>3<\/span>      return<\/span> function<\/span> foo() { };\n<\/span>4<\/span> }\n<\/span>5<\/span> bar( );\n<\/span>6<\/span> console.log(foo);\/\/<\/span>foo is not defined<\/span><\/pre> \n <\/div> \n 
 <\/p> \n 
\u4e8c.<\/p> \n 
 \n  
1<\/span> var<\/span> foo = 1;\n<\/span>2<\/span> function<\/span> bar() {\n<\/span>3<\/span>     foo = 10;            \n<\/span>4<\/span>     return<\/span>;\n<\/span>5<\/span>     function<\/span> foo() {};\n<\/span>6<\/span> }\n<\/span>7<\/span> bar();\n<\/span>8<\/span> console.log(foo);<\/pre> \n <\/div> \n 
\u7406\u89e3\u8981\u70b9\uff1a<\/span><\/p> \n 
1. bar\uff08\uff09\u51fd\u6570\u4f5c\u7528\u57df\u4e2d\uff0cfunction foo\uff08\uff09{}\uff1b\u8bed\u53e5\u867d\u7136\u5728 return\uff1b\u8bed\u53e5\u540e\u9762\uff0c\u5bf9\u7684\uff0creturn\uff1b\u8bed\u53e5\u540e\u7684\u6240\u6709\u8bed\u53e5\u90fd\u4e0d\u4f1a\u88ab\u6267\u884c\uff0c\u4f46\u662f\u5728\u6267\u884c\u4ee3\u7801\u524d\uff0c\u51fd\u6570\u58f0\u660e\u4f1a\u88ab\u63d0\u524d\u5904\u7406\uff0c\u6b64\u65f6\u51fd\u6570\u58f0\u660e\u8bed\u53e5\u4f1a\u88ab\u63d0\u5347\u5230\u5f53\u524d\u4f5c\u7528\u57df\u7684\u6700\u524d\u9762\u3002\u5373\u5b9e\u9645\u4e0a\u662f\u8fd9\u6837\u7684\uff1a<\/p> \n 
 \n  
 1<\/span> var<\/span> foo = 1;\n<\/span> 2<\/span> function<\/span> bar() {\n<\/span> 3<\/span>     function<\/span> foo() {};\n<\/span> 4<\/span>     console.log(foo);\/\/<\/span>? foo() {}<\/span>\n 5<\/span>     foo = 10;\n<\/span> 6<\/span>     console.log(foo);\/\/<\/span>10        <\/span>\n 7<\/span>     return<\/span>;\n<\/span> 8<\/span>     function<\/span> foo() {};\/\/<\/span>return\uff1b\u540e\u7684\u8bed\u53e5\u4e0d\u6267\u884c<\/span>\n 9<\/span>     console.log(foo);\n<\/span>10<\/span> }\n<\/span>11<\/span> bar();\n<\/span>12<\/span> console.log(foo);<\/pre> \n <\/div> \n 
2. \u65e2\u7136 bar\uff08\uff09\u51fd\u6570\u4f5c\u7528\u57df\u4e2d\u5df2\u7ecf\u6709\u4e86 foo \u7684\u58f0\u660e\uff0c\u8bf4\u660e bar\uff08\uff09\u4e2d foo \u53ea\u662f\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf\uff0c\u5728 bar\uff08\uff09\u6267\u884c\u5b8c\u6bd5\u5c31\u4f1a\u88ab\u9500\u6bc1\uff0c\u4e0d\u5f71\u54cd\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u7684 foo \u53d8\u91cf\uff0c\u6240\u4ee5:<\/p> \n 
 \n  
1<\/span> var<\/span> foo = 1;\n<\/span>2<\/span> function<\/span> bar() {\n<\/span>3<\/span>     foo = 10;            \n<\/span>4<\/span>     return<\/span>;\n<\/span>5<\/span>     function<\/span> foo() {};\n<\/span>6<\/span> }\n<\/span>7<\/span> bar();\n<\/span>8<\/span> console.log(foo);\/\/<\/span>1<\/span><\/pre> \n <\/div> \n 
 <\/p> \n 
\u4e09.<\/p> \n 
 \n  
1<\/span> var<\/span> a = 1;\n<\/span>2<\/span> function<\/span> fn() {\n<\/span>3<\/span>     console.log(a);\n<\/span>4<\/span>     var<\/span> a = 2;\n<\/span>5<\/span> }\n<\/span>6<\/span> fn();\n<\/span>7<\/span> console.log(a);<\/pre> \n <\/div> \n 
\u7406\u89e3\u8981\u70b9:<\/span><\/p> \n 
1. \u51fd\u6570 fn\uff08\uff09\u7684\u53d8\u91cf\u58f0\u660e\u8bed\u53e5var a = 2\uff1b\u4f1a\u63d0\u5347\uff1b<\/p> \n 
2. fn \uff08\uff09\u5b58\u5728\u51fd\u6570\u5c40\u90e8\u53d8\u91cf a\uff1b\u4e0e\u5168\u5c40\u4f5c\u7528\u57df\u4e2d\u7684\u53d8\u91cf a \u4e92\u4e0d\u5f71\u54cd\uff1b<\/p> \n 
\u6240\u4ee5\u5b9e\u9645\u4e0a\u662f\u8fd9\u6837\u7684\uff1a<\/p> \n 
 \n  
1<\/span> var<\/span> a = 1;\n<\/span>2<\/span> function<\/span> fn() {\n<\/span>3<\/span>     var<\/span> a;\n<\/span>4<\/span>     console.log(a);\/\/<\/span>undefined<\/span>\n5<\/span>     a = 2;\n<\/span>6<\/span>     console.log(a);\/\/<\/span>2<\/span>\n7<\/span> }\n<\/span>8<\/span> fn();\n<\/span>9<\/span> console.log(a);\/\/<\/span>1<\/span><\/pre> \n <\/div> \n 
\u5373\uff1a<\/p> \n 
 \n  
1<\/span> var<\/span> a = 1;\n<\/span>2<\/span> function<\/span> fn() {\n<\/span>3<\/span>     console.log(a);\/\/<\/span>undefined<\/span>\n4<\/span>     var<\/span> a = 2;\n<\/span>5<\/span> }\n<\/span>6<\/span> fn();\n<\/span>7<\/span> console.log(a);\/\/<\/span>1<\/span><\/pre> \n <\/div> \n 
 <\/p> \n 
\u56db.<\/p> \n 
 \n  
1<\/span> var<\/span> a = 1;\n<\/span>2<\/span> function<\/span> fn(a) {\n<\/span>3<\/span>     console.log(a);\n<\/span>4<\/span>     var<\/span> a = 2;\n<\/span>5<\/span> }\n<\/span>6<\/span> fn(a);\n<\/span>7<\/span> console.log(a);<\/pre> \n <\/div> \n 
 \u7406\u89e3\u8981\u70b9\uff1a<\/span><\/p> \n 
1. \u51fd\u6570\u5f62\u53c2\u662f\u5b58\u5728\u4e8e\u51fd\u6570\u4f5c\u7528\u57df\u4e2d\u7684\u5c40\u90e8\u53d8\u91cf\uff0c\u6240\u4ee5\u6b64\u9898 fn\uff08a\uff09\u4e2d\u76f8\u5f53\u4e8e\u58f0\u660e\u4e86\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf a\uff1b<\/p> \n 
2. fn\uff08a\uff09\uff1b\u76f8\u5f53\u4e0e fn\uff081\uff09\uff1b<\/p> \n 
\u6240\u4ee5\uff1a<\/p> \n 
 \n  
1<\/span> var<\/span> a = 1;\n<\/span>2<\/span> function<\/span> fn(a) {\n<\/span>3<\/span>     console.log(a);\n<\/span>4<\/span>     var<\/span> a = 2;\n<\/span>5<\/span> }\n<\/span>6<\/span> fn(a);\n<\/span>7<\/span> console.log(a)","orderid":"0","title":"JS \u51fd\u6570\u4f5c\u7528\u57df\u53ca\u53d8\u91cf\u63d0\u5347\u90a3\u4e9b\u4e8b\uff01(\u4e00)","smalltitle":"","mid":"0","fname":"Web","special_id":"0","bak_id":"0","info":"0","hits":"2223","pages":"2","comments":"0","posttime":"2017-10-16 18:19:19","list":"1508149159","username":"admin","author":"","copyfrom":"","copyfromurl":"","titlecolor":"","fonttype":"0","titleicon":"0","picurl":"https:\/\/www.cppentry.com\/upload_files\/","ispic":"0","yz":"1","yzer":"","yztime":"0","levels":"0","levelstime":"0","keywords":"\u51fd\u6570<\/A> \u4f5c\u7528<\/A> \u53d8\u91cf<\/A> \u63d0\u5347<\/A> \u90a3\u4e9b<\/A>","jumpurl":"","iframeurl":"","style":"","template":"a:3:{s:4:\"head\";s:0:\"\";s:4:\"foot\";s:0:\"\";s:8:\"bencandy\";s:0:\"\";}","target":"0","ip":"113.108.110.181","lastfid":"0","money":"0","buyuser":"","passwd":"","allowdown":"","allowview":"","editer":"","edittime":"0","begintime":"0","endtime":"0","description":"JS \u51fd\u6570\u4f5c\u7528\u57df\u53ca\u53d8\u91cf\u63d0\u5347\u90a3\u4e9b\u4e8b\uff01","lastview":"1714082645","digg_num":"8822","digg_time":"0","forbidcomment":"0","ifvote":"0","heart":"","htmlname":"","city_id":"0"},"page":"1"}