{"id":1541,"date":"2011-04-13T10:34:00","date_gmt":"2011-04-13T02:34:00","guid":{"rendered":""},"modified":"2013-11-25T18:15:47","modified_gmt":"2013-11-25T10:15:47","slug":"%e8%83%bd%e8%af%b4%e6%98%8e%e4%bd%a0%e7%9a%84javascript%e6%8a%80%e6%9c%af%e5%be%88%e7%83%82%e7%9a%84%e4%ba%94%e4%b8%aa%e5%8e%9f%e5%9b%a0","status":"publish","type":"post","link":"https:\/\/kyle.ai\/blog\/1541.html","title":{"rendered":"\u80fd\u8bf4\u660e\u4f60\u7684Javascript\u6280\u672f\u5f88\u70c2\u7684\u4e94\u4e2a\u539f\u56e0"},"content":{"rendered":"

Javascript\u5728\u4e92\u8054\u7f51\u4e0a\u540d\u58f0\u5f88\u81ed\uff0c\u4f46\u4f60\u53c8\u5f88\u96be\u518d\u627e\u5230\u4e00\u4e2a\u50cf\u5b83\u8fd9\u6837\u5982\u6b64\u52a8\u6001\u3001\u5982\u6b64\u88ab\u5e7f\u6cdb\u4f7f\u7528\u3001\u5982\u6b64\u6839\u690d\u4e8e\u6211\u4eec\u7684\u751f\u6d3b\u4e2d\u7684\u53e6\u5916\u4e00\u79cd\u8bed\u8a00\u3002\u5b83\u7684\u4f4e\u5b66\u4e60\u95e8\u69db\u8ba9\u5f88\u591a\u4eba\u90fd\u79f0\u5b83\u4e3a\u5b66\u524d\u811a\u672c\u8bed\u8a00\uff0c\u5b83\u53e6\u5916\u4e00\u4e2a\u8ba9\u4eba\u5632\u7b11\u7684\u4e1c\u897f\u662f\u52a8\u6001\u8bed\u8a00\u7684\u6982\u5ff5\u662f\u504f\u504f\u4f7f\u7528\u4e86\u9ad8\u6807\u51c6\u7684\u9759\u6001\u6570\u636e\u7c7b\u578b\u3002\u5176\u5b9e\uff0c\u4f60\u548cJavascript\u90fd\u7ad9\u9519\u4e86\u7acb\u573a\uff0c\u800c\u73b0\u5728\uff0c\u4f60\u8ba9Javascript\u5f88\u751f\u6c14\u3002\u8fd9\u91cc\u6709\u4e94\u4e2a\u539f\u56e0\u80fd\u8bf4\u660e\u4f60\u7684Javascript\u6280\u672f\u5f88\u70c2\u3002<\/p>\n

1. \u4f60\u6ca1\u6709\u4f7f\u7528\u547d\u540d\u7a7a\u95f4\u3002<\/p>\n

\u662f\u5426\u8fd8\u8bb0\u5f97\u5728\u5927\u5b66\u91cc\u8001\u5e08\u544a\u8bc9\u4f60\u4e0d\u8981\u5728\u5bb6\u5ead\u4f5c\u4e1a\u91cc\u4f7f\u7528\u5168\u5c40\u53d8\u91cf\uff1fJavascript\u91cc\u7684\u5168\u5c40\u53d8\u91cf\u7684\u4f7f\u7528\u65b9\u6cd5\u4e5f\u4e0d\u4f8b\u5916\u3002Web\u7f51\u9875\u7a0d\u4e0d\u7559\u795e\u5c31\u4f1a\u53d8\u7684\u6df7\u4e71\u4e0d\u582a\u3001\u5230\u5904\u90fd\u662f\u4ece\u4e92\u8054\u7f51\u4e0a\u5404\u4e2a\u89d2\u843d\u91cc\u627e\u6765\u7684\u4e71\u7cdf\u7cdf\u7684\u76f8\u4e92\u4fb5\u72af\u7684\u811a\u672c\u548c\u811a\u672c\u5e93\u3002\u5982\u679c\u4f60\u628a\u4e00\u4e2a\u53d8\u91cf\u547d\u540d\u6210loader()\uff0c\u90a3\u4f60\u662f\u6210\u5fc3\u81ea\u627e\u9ebb\u70e6\u3002\u5982\u679c\u4f60\u5728\u65e0\u610f\u8bc6\u7684\u60c5\u51b5\u4e0b\u91cd\u8f7d\u4e86\u4e00\u4e2a\u51fd\u6570\uff0cJavascript\u6839\u672c\u4e0d\u4f1a\u63d0\u9192\u4f60\u3002\u4f60\u8fd8\u628a\u5b83\u53eb\u505a\u4e00\u79cd\u5b66\u524d\u6559\u80b2\u7f16\u7a0b\u8bed\u8a00\uff0c\u8fd8\u8bb0\u5f97\u5427\uff1f\u6211\u8981\u8bf4\u7684\u662f\uff0c\u4f60\u9700\u8981\u77e5\u9053\u5728\u505a\u4e86\u8fd9\u4e9b\u540e\u53d1\u751f\u4ec0\u4e48\u60c5\u51b5\u3002<\/p>\n

\r\nfunction derp() { alert(\u201cone\u201d); }\r\nfunction derp() { alert(\u201ctwo\u201d); }\r\nderp();\r\n<\/pre>\n
\u201ctwo\u201d\uff0c\u7b54\u6848\u662f\u201ctwo\u201d\u3002\u5e76\u4e0d\u662f\u4e00\u5b9a\u4f1a\u8fd9\u6837\uff0c\u5b83\u4e5f\u53ef\u80fd\u662f\u201cone\u201d\u3002\u6240\u4ee5\uff0c\u628a\u4f60\u6240\u6709\u7684\u4ee3\u7801\u90fd\u653e\u5728\u81ea\u5df1\u7684\u547d\u540d\u7a7a\u95f4\u91cc\uff0c\u8fd9\u5f88\u5bb9\u6613\u3002\u4e0b\u9762\u662f\u5b9a\u4e49\u81ea\u5df1\u7684\u547d\u540d\u7a7a\u95f4\u7684\u4e00\u4e2a\u7b80\u5355\u505a\u6cd5\u3002<\/p>\n
\r\nvar foospace={};\r\nfoospace.derp=function() { alert(\u201cone\u201d); }\r\nfunction derp() { alert(\u201ctwo\u201d); }\r\nfoospace.derp();\r\n<\/pre>\n
2. \u4f60\u5728\u53d8\u620f\u6cd5\uff0c\u4f60\u628a\u53d8\u91cf\u5b9a\u4e49\u7684\u4e1c\u4e00\u4e2a\u897f\u4e00\u4e2a\u3002<\/p>\n
\u4f60\u4f7f\u7528\u83ab\u540d\u5176\u5999\u7684\u6570\u5b57\u5b57\u6bcd\u7ec4\u5408\u4f5c\u4e3a\u53d8\u91cf\u540d\u662f\u4e00\u4e2a\u53cc\u8f93\u7684\u7ed3\u5c40\u3002\u572840\u884c\u7684\u4ee3\u7801\u5757\u4e86\u4e2d\u5bfb\u627e\u4e00\u4e2a\u4e0d\u5e26\u4efb\u4f55\u8868\u610f\u7684\u5b57\u7b26\u53d8\u91cf\uff0c\u5bf9\u4e8e\u7ef4\u62a4\u5de5\u4f5c\u6765\u8bf4\u7b80\u76f4\u662f\u573a\u5669\u68a6\u3002\u628a\u5bf9\u53d8\u91cf\u7684\u7b2c\u4e00\u6b21\u58f0\u660e\u6df7\u5408\u5230\u4e00\u4e2a40\u884c\u7684\u4ee3\u7801\u5757\u91cc\u540c\u6837\u4e5f\u662f\u4e00\u573a\u5669\u68a6\u3002\u5373\u4f7f\u4f60\u81ea\u5df1\u9047\u5230\u8fd9\u6837\u7684\u53d8\u91cf\u65f6\uff0c\u4f60\u4e5f\u8981\u4e0d\u7531\u7684\u95ee\u81ea\u5df1\uff1a\u201c\u8fd9\u662f\u5728\u54ea\u91cc\u5b9a\u4e49\u7684\uff1f\u201d\uff0c\u7136\u540e\u8fc5\u901f\u7684\u4f7f\u7528Ctrl+F\u7ec4\u5408\u5728\u6e90\u4ee3\u7801\u91cc\u5bfb\u627e\u8fd9\u4e2a\u53d8\u91cf\u6700\u521d\u5b9a\u4e49\u7684\u4f4d\u7f6e\u3002\u4e0d\uff0c\u4e0d\u8981\u8fd9\u6837\uff0c\u76f8\u53cd\uff0c\u8fd9\u662f\u5bf9Javascript\u7684\u6ee5\u7528\uff0c\u662f\u4e00\u79cd\u611a\u8822\u7684\u505a\u6cd5\u3002\u4f60\u5e94\u8be5\u59cb\u7ec8\u628a\u53d8\u91cf\u5b9a\u4e49\u5728\u5b83\u7684\u4f7f\u7528\u8303\u56f4\u7684\u9876\u90e8\u3002\u5e76\u4e0d\u80fd\u8bf4\u56e0\u4e3a\u8fd9\u4e0d\u662f\u5fc5\u987b\u7684\uff0c\u4f60\u5c31\u53ef\u4ee5\u4e0d\u8fd9\u6837\u505a\u3002<\/p>\n
\r\nfunction() {\r\nvar a, \/\/description\r\nb; \/\/description\r\n\/\/process\u2026\r\n}\r\n<\/pre>\n
3. \u4f60\u6ca1\u6709\u7406\u89e3Javascript\u7684\u53d8\u91cf\u8303\u56f4\u3002<\/p>\n
\u4f60\u662f\u4e2a\u5929\u624d\u7684\u7a0b\u5e8f\u5458\uff0c\u4f60\u5403\u7684\u662fC++\u3001\u62c9\u7684\u662fList\u3002\u4f60\u77e5\u9053\u4ec0\u4e48\u662f\u53d8\u91cf\u8303\u56f4\uff0c\u4f60\u5bf9\u4f60\u7684\u53d8\u91cf\u6709\u5b8c\u5168\u7684\u63a7\u5236\uff0c\u4f60\u5c31\u50cf\u592a\u4e0a\u7687\u4f3c\u7684\u7684\u6ce8\u89c6\u7740\u5b83\u4eec\u3002\u7136\u800c\uff0cJavascript\u5374\u5728\u4f60\u7684\u5496\u5561\u91cc\u62c9\u4e86\u4e00\u6ce1\u5c4e\uff0c\u5e76\u4e14\u5927\u7b11\u4e0d\u6b62\u3002<\/p>\n
\r\nvar herp=\u201done\u201d;\r\n{\r\nvar herp=\u201dtwo\u201d;\r\n}\r\nalert(herp);\r\n<\/pre>\n
\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u4f60\u5f97\u5230\u7684herp\u4e0d\u662f\u201cone\u201d\uff0c\u800c\u662f\u201ctwo\u201d\u3002Javascript\u7684\u53d8\u91cf\u6709\u6548\u8303\u56f4\u5e76\u4e0d\u662f\u8ddf\u5176\u5b83\u8bed\u8a00\u4e00\u6837\u4f9d\u8d56\u4e8e\u4ee3\u7801\u5757\u3002Javascript\u7684\u53d8\u91cf\u8303\u56f4\u662f\u4ee5\u51fd\u6570\u4e3a\u57fa\u7840\u7684\u3002\u6bcf\u4e2a\u51fd\u6570\u90fd\u6709\u5b83\u81ea\u5df1\u7684\u53d8\u91cf\u8303\u56f4\uff0cJavascript\u8fd9\u4e00\u70b9\u4e0a\u8868\u73b0\u7684\u5f88\u9177\uff0c\u6839\u672c\u4e0d\u7406\u776c\u8fd9\u6beb\u65e0\u610f\u4e49\u7684\u82b1\u62ec\u5f27\u5305\u8d77\u6765\u7684\u8303\u56f4\u3002\u4e8b\u5b9e\u4e0a\uff0cJavascript\u662f\u5982\u6b64\u7684\u9177\uff0c\u4ee5\u81f3\u4e8e\u4f60\u751a\u81f3\u53ef\u4ee5\u5c06\u53d8\u91cf\u8303\u56f4\u50cf\u547d\u540d\u7a7a\u95f4\u6216\u53d8\u91cf\u90a3\u6837\u8fdb\u884c\u4f20\u9012\u3002<\/p>\n
4. \u4f60\u4ee5\u4e3aJavascript\u7684\u9762\u5411\u5bf9\u8c61\u7279\u5f81\u53ea\u662f\u5ac1\u63a5\u800c\u6765\u7684\u3002<\/p>\n
Javascript\uff0c\u81ea\u4ece\u5471\u5471\u843d\u5730\u8d77\uff0c\u5b83\u5c31\u662f\u4e00\u4e2a\u9762\u5411\u5bf9\u8c61\u7684\u8bed\u8a00\u3002\u6240\u6709\u7684\u4e1c\u897f\u5728Javascript\u91cc\u90fd\u662f\u5bf9\u8c61\uff0c\u6240\u6709\u7684\uff01\u751a\u81f3\u6570\u5b57\u548c\u5b57\u7b26\u8fd9\u6837\u7684\u6587\u5b57\u7b26\u53f7\u90fd\u53ef\u4ee5\u901a\u8fc7\u5b83\u81ea\u8eab\u56fa\u6709\u7684\u6784\u9020\u5668\u8f6c\u5316\u6210\u5bf9\u8c61\u3002\u8ddf\u5176\u5b83\u9762\u5411\u5bf9\u8c61\u7684\u8bed\u8a00\u6bd4\u8d77\u6765\uff0cJavascript\u7684\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\uff0c\u5b83\u6ca1\u6709\u7c7b(class)\u3002Javascript\u5bf9\u8c61\u50cf\u51fd\u6570\u90a3\u6837\u5b9a\u4e49\uff0c\u751a\u81f3\u51fd\u6570\u81ea\u5df1\u4e5f\u662f\u5bf9\u8c61\u3002Javascript\u6709\u4e2a\u5c5e\u6027\u53eb\u505aprototype\uff0c\u6240\u6709\u5bf9\u8c61\u91cc\u90fd\u5185\u7f6e\u4e86\u8fd9\u4e2a\u5c5e\u6027\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7\u5b83\u6765\u6539\u53d8\u5bf9\u8c61\u7684\u6784\u9020\uff0c\u4fee\u6539\u5bf9\u8c61\u3001\u6dfb\u52a0\u66f4\u591a\u7684\u53d8\u91cf\u3001\u66f4\u591a\u7684\u529f\u80fd\u3002<\/p>\n
\r\nvar derp; \/\/ will hold a Herp instance\r\nvar Herp= function() {\r\nthis.opinion=\u201dJavascript is cooler than BASIC.\u201d;\r\n}\r\nHerp.prototype.speak=function() { alert(this.opinion); }\r\nvar derp= new Herp();\r\nderp.speak();\r\n<\/pre>\n
\u5982\u679c\u8fd9\u4e2a\u770b\u8d77\u6765\u8ddf\u4f60\u6beb\u4e0d\u76f8\u5e72\uff0c\u6211\u613f\u610f\u4ecb\u7ecd\u6211\u7684\u597d\u670b\u53cbGoogle\u7ed9\u4f60\uff0cGoogle\u64c5\u957f\u4e8e\u5e2e\u52a9\u4eba\u4eec\u5b66\u4e60\u77e5\u8bc6\u3002\u9762\u5411\u5bf9\u8c61\u5bf9\u4e8e\u6211\u8fd9\u7bc7\u7b80\u77ed\u7684\u3001\u4f4e\u59ff\u6001\u7684\u6587\u7ae0\u6765\u8bf4\u5b9e\u5728\u662f\u4e2a\u592a\u5927\u7684\u8bdd\u9898\u3002<\/p>\n
5. \u4f60\u4f7f\u7528\u201cnew\u201d\u5173\u952e\u5b57\u65f6\u5c31\u50cf\u662f\u76f2\u4eba\u778e\u9a6c\u3002<\/p>\n
Javascript\u80af\u5b9a\u662f\u4f60\u7684\u521d\u604b\u5973\u53cb\uff0c\u56e0\u4e3a\u4f60\u663e\u5f97\u65e0\u6240\u9002\u4ece\u3002\u5982\u679c\u4f60\u60f3\u50cf\u771f\u4eba\u90a3\u6837\u53d6\u60a6Javascript\uff0c\u4f60\u9700\u8981\u53bb\u4e86\u89e3\u5bf9\u8c61\u7b26\u53f7\u3002\u9664\u4e86\u5728\u9700\u8981\u5b9e\u4f8b\u5316\u4e00\u4e2a\u5bf9\u8c61\uff0c\u6216\u7f55\u89c1\u7684\u9700\u8981\u5ef6\u65f6\u52a0\u8f7d\u6570\u636e\u7684\u60c5\u51b5\u5916\uff0c\u4f60\u57fa\u672c\u4e0a\u4e0d\u9700\u8981\u4f7f\u7528new\u5173\u952e\u5b57\u3002\u5728Javascript\u91cc\u5206\u914d\u5927\u91cf\u7684new\u53d8\u91cf\u5730\u5740\u662f\u4e00\u9879\u5f88\u6162\u7684\u64cd\u4f5c\uff0c\u4e3a\u4e86\u6548\u7387\u8d77\u89c1\uff0c\u4f60\u5e94\u8be5\u59cb\u7ec8\u4f7f\u7528\u5bf9\u8c61\u7b26\u53f7\u3002<\/p>\n
\r\nvar rightway= [1, 2, 3];\r\nvar wrongway= new Array(1, 2, 3);\r\n<\/pre>\n
\u662f\u5426\u8fd8\u8bb0\u5f97\u6211\u8bf4\u8fc7Javascript\u7684\u53d8\u91cf\u8303\u56f4\u662f\u4ee5\u51fd\u6570\u4e3a\u57fa\u7840\u7684\uff1f\u662f\u5426\u8fd8\u8bb0\u5f97\u6709\u4eba\u8bf4Javascript\u7684\u5bf9\u8c61\u50cf\u51fd\u6570\u90a3\u6837\u5b9a\u4e49\uff1f\u5982\u679c\u4f60\u4e0d\u4f7f\u7528new\u5173\u952e\u5b57\u6765\u58f0\u660e\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4f60\u5c06\u4f1a\u4f7f\u8fd9\u4e2a\u5bf9\u8c61\u6210\u4e3a\u5168\u5c40\u8303\u56f4\u5185\u7684\u5bf9\u8c61\u3002\u6240\u4ee5\uff0c\u6c38\u8fdc\u4f7f\u7528new\u5173\u952e\u5b57\u6765\u58f0\u660e\u5bf9\u8c61\u662f\u4e00\u4e2a\u597d\u4e60\u60ef\u3002<\/p>\n
\r\nvar derp=\u201done\u201d;\r\nvar Herp=function() {\r\nthis.derp=\u201dtwo\u201d;\r\n}\r\nvar foo=Herp();\r\nalert(derp);\r\n<\/pre>\n
\u5982\u679c\u4f60\u8fd9\u6837\u5199\uff0cJavascript\u5e76\u4e0d\u4f1a\u5728\u610f\uff0c\u800c\u4f60\u771f\u6b63\u5f39\u51fa\u7684\u7b54\u6848\u662f\u201ctwo\u201d\uff01\u6709\u5f88\u591a\u65b9\u6cd5\u53ef\u4ee5\u9632\u6b62\u5bf9\u8c61\u505a\u51fa\u8fd9\u6837\u7684\u884c\u4e3a\uff0c\u53ef\u4ee5\u4ee5\u4f7f\u7528instanceOf\uff0c\u4f46\u66f4\u597d\u7684\u65b9\u6cd5\u662f\u6b63\u786e\u7684\u4f7f\u7528new\u5173\u952e\u5b57\uff0c\u8fd9\u6837\u663e\u5f97\u66f4\u4e13\u4e1a\u3002<\/p>\n
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