{"id":604,"date":"2008-10-18T00:10:11","date_gmt":"2008-10-17T16:10:11","guid":{"rendered":"http:\/\/fdream.net\/blog\/article\/604.aspx"},"modified":"2008-10-18T02:10:09","modified_gmt":"2008-10-17T18:10:09","slug":"JavaScript%e7%9a%84%e5%bc%b1%e7%b1%bb%e5%af%b9%e8%b1%a1%e5%8f%8a%e7%bb%a7%e6%89%bf%e5%ae%9e%e7%8e%b0%e6%96%b9%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/fdream.net\/blog\/article\/604","title":{"rendered":"JavaScript\u7684\u5f31\u7c7b\u5bf9\u8c61\u53ca\u7ee7\u627f\u5b9e\u73b0\u65b9\u5f0f"},"content":{"rendered":"<p>\u8fd9\u7bc7\u6587\u7ae0\u662fYahoo!\u7684\u4e00\u540d\u8d44\u6df1\u5f00\u53d1\u4eba\u5458\u5199\u7684\uff0c\u5bf9\u4e8eJavaScript\u7684\u5f31\u7c7b\u5bf9\u8c61\u53ca\u5176\u7ee7\u627f\u65b9\u5f0f\u8bb2\u5f97\u975e\u5e38\u900f\u5f7b\uff0c\u6587\u7ae0\u5199\u5f97\u5f88\u597d\uff0c\u800c\u81ea\u5df1\u6700\u8fd1\u53c8\u5f88\u6709\u70b9\u7ffb\u8bd1\u6b32\u671b\uff0c\u4e8e\u662f\u4e5f\u4e00\u5e76\u7ffb\u8bd1\u8fc7\u6765\u4e86\u3002\u53e6\u5916\uff0c<a href=\"http:\/\/mootools.net\/blog\/2008\/10\/16\/mootools-121-released\/\" target=\"_blank\" title=\"MooTools 1.2.1\">MooTools 1.2.1<\/a>\u5df2\u7ecf\u53d1\u5e03\u4e86\uff0c\u4fee\u590d\u4e86\u4e00\u4e9bbug\u3002<\/p>\n<p>\u539f\u6587\u5730\u5740\uff1a<a href=\"http:\/\/www.javaranch.com\/journal\/2008\/10\/Journal200810.jsp#a1\" target=\"_blank\" title=\"JavaScript's class-less objects\">JavaScript&#8217;s class-less objects<\/a><\/p>\n<p>\u8bf7\u5c0a\u91cd\u4e2a\u4eba\u52b3\u52a8\uff0c\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u51fa\u5904\uff1ahttp:\/\/fdream.net\uff0c\u8bd1\u8005\uff1aFdream<\/p>\n<p>Java\u548cJavaScript\u662f\u76f8\u5dee\u6781\u5927\u7684\u4e24\u79cd\u8bed\u8a00\uff0c\u5c3d\u7ba1\u4ed6\u4eec\u7684\u540d\u5b57\u975e\u5e38\u50cf\uff0c\u800c\u4e14\u90fd\u6709\u7c7bC\u7684\u8bed\u6cd5\u98ce\u683c\uff0c\u5f88\u591a\u65f6\u5019\u8fd9\u8ba9\u4eba\u4eec\u5f88\u8ff7\u60d1\u3002\uff08Fdream\u6ce8\uff1a\u66fe\u6709\u4eba\u5728\u8bba\u575b\u4e0a\u95eeJava\u548cJavaScript\u662f\u4ec0\u4e48\u5173\u7cfb\uff1f\u6211\u4e00\u5e08\u5144\u7684\u56de\u7b54\u975e\u5e38\u7ecf\u5178\uff1a\u96f7\u950b\u548c\u96f7\u5cf0\u5854\u7684\u5173\u7cfb\u3002\uff09\u6211\u4eec\u6765\u770b\u770b\u4e24\u8005\u6700\u4e3b\u8981\u7684\u533a\u522b\u2014\u2014\u5bf9\u8c61\u662f\u600e\u6837\u521b\u5efa\u7684\u3002\u5728Java\u4e2d\uff0c\u4f60\u6709\u7c7b\u3002\u7136\u540e\u662f\u5bf9\u8c61\uff0c\u53c8\u53eb\u5b9e\u4f8b\uff0c\u90fd\u662f\u57fa\u4e8e\u90a3\u4e9b\u7c7b\u5efa\u7acb\u7684\u3002\u800c\u5728JavaScript\u4e2d\uff0c\u6ca1\u6709\u7c7b\u5b58\u5728\uff0c\u5bf9\u8c61\u66f4\u50cf\u662f\u4e00\u4e2a\u5305\u542b\u952e\u503c\u5bf9\uff08key-value pair\uff09\u7684\u54c8\u5e0c\u8868\uff08hash table\uff09\u3002\u7136\u540e\u7ee7\u627f\u662f\u4ec0\u4e48\u6837\u7684\u5462\uff1f\u597d\uff0c\u6211\u4eec\u4e00\u6b65\u4e00\u6b65\u6765\u3002<\/p>\n<p><b>JavaScript\u5bf9\u8c61<\/b><\/p>\n<p>\u5f53\u4f60\u8003\u8651\u4e00\u4e2aJavaScript\u5bf9\u8c61\u65f6\uff0c\u60f3\u4e00\u4e0bhash\u3002\u5b83\u4eec\u548c\u5bf9\u8c61\u5b8c\u5168\u4e00\u6837\u2014\u2014\u5b83\u4eec\u90fd\u662f\u540d\u503c\u5bf9\uff08name-value pair\uff09\u96c6\u5408\uff0c\u503c\u53ef\u4ee5\u662f\u5176\u5b83\u4efb\u4f55\u4e1c\u897f\uff0c\u5305\u62ec\u5bf9\u8c61\u548c\u51fd\u6570\u3002\u5f53\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\u662f\u51fd\u6570\u7684\u65f6\u5019\uff0c\u4f60\u4e5f\u53ef\u4ee5\u53eb\u5b83\u4eec\u65b9\u6cd5\u3002<\/p>\n<p>\u8fd9\u662f\u4e00\u4e2a\u7a7a\u5bf9\u8c61\uff1a<\/p>\n<p><pre lang=\"javascript\">\nvar myobj = {};\n<\/pre>\n<\/p>\n<p>\u73b0\u5728\uff0c\u4f60\u53ef\u4ee5\u5f00\u59cb\u7ed9\u8fd9\u4e2a\u5bf9\u8c61\u6dfb\u52a0\u4e00\u4e9b\u6709\u610f\u4e49\u7684\u529f\u80fd\uff1a<\/p>\n<p><pre lang=\"javascript\">\nmyobj.name = &quot;My precious&quot;;\nmyobj.getName = function() {return this.name};\n<\/pre>\n<\/p>\n<p>\u6ce8\u610f\u8fd9\u6837\u4e00\u4e9b\u4e8b\u60c5\uff1a<\/p>\n<ul style=\"list-style-type:disc\">\n<li>\u5728\u65b9\u6cd5\u4e2d\uff0cthis\u6307\u5411\u5f53\u524d\u5bf9\u8c61\uff0c\u548c\u671f\u671b\u4e00\u6837<\/li>\n<li>\u4f60\u53ef\u4ee5\u5728\u4efb\u4f55\u65f6\u5019\u6dfb\u52a0\u3001\u4fee\u6539\u3001\u5220\u9664\u5c5e\u6027\uff0c\u4e0d\u9650\u4e8e\u521b\u5efa\u7684\u65f6\u5019<\/li>\n<\/ul>\n<p>\u53e6\u4e00\u79cd\u521b\u5efa\u5bf9\u8c61\u5e76\u540c\u65f6\u6dfb\u52a0\u5c5e\u6027\u6216\u8005\u65b9\u6cd5\u7684\u65b9\u5f0f\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n<p><pre lang=\"javascript\">\nvar another = {\n  name: 'My other precious',\n  getName: function() {\n    return this.name;\n  }\n};\n<\/pre>\n<\/p>\n<p>\u8fd9\u79cd\u8bed\u6cd5\u5c31\u53eb\u505a\u201c\u5bf9\u8c61\u679a\u4e3e\u8868\u793a\u6cd5\u201d\uff08object literal notation\uff09\u2014\u2014\u4f60\u628a\u6240\u6709\u7684\u4e1c\u897f\u90fd\u5305\u542b\u5728\u82b1\u62ec\u53f7 { \u548c } \u4e4b\u95f4\uff0c\u5e76\u7528\u9017\u53f7\u5728\u5bf9\u8c61\u5185\u90e8\u533a\u5206\u6bcf\u4e2a\u5c5e\u6027\u3002\u952e\u503c\u5bf9\uff08key:value pair\uff09\u5219\u4ee5\u5192\u53f7\u5206\u5272\u3002\u8fd9\u4e2d\u8bed\u6cd5\u4e5f\u4e0d\u662f\u521b\u5efa\u5bf9\u8c61\u7684\u552f\u4e00\u65b9\u5f0f\u3002<\/p>\n<p><b>\u6784\u9020\u51fd\u6570<\/b><\/p>\n<p>\u53e6\u4e00\u79cd\u521b\u5efaJavaScript\u5bf9\u8c61\u7684\u65b9\u5f0f\u5c31\u662f\u4f7f\u7528\u6784\u9020\u51fd\u6570\uff08constructor function\uff09\u3002\u8fd9\u91cc\u662f\u4e00\u4e2a\u6784\u9020\u51fd\u6570\u793a\u4f8b\uff1a<\/p>\n<p><pre lang=\"javascript\">\nfunction ShinyObject(name) {\n  this.name = name;\n  this.getName = function() {\n    return this.name;\n  }\n}\n<\/pre>\n<\/p>\n<p>\u73b0\u5728\uff0c\u6211\u4eec\u53ef\u4ee5\u66f4\u50cfJava\u90a3\u6837\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\uff1a<\/p>\n<p><pre lang=\"javascript\">\nvar my = new ShinyObject('ring');\nvar myname = my.getName();       \/\/ &quot;ring&quot;\n<\/pre>\n<\/p>\n<p>\u521b\u5efa\u4e00\u4e2a\u6784\u9020\u51fd\u6570\u7684\u8bed\u6cd5\u548c\u5176\u4ed6\u51fd\u6570\u6ca1\u6709\u4efb\u4f55\u533a\u522b\uff0c\u552f\u4e00\u7684\u533a\u522b\u662f\u5b83\u4eec\u7684\u7528\u6cd5\u4e0d\u4e00\u6837\u3002\u5982\u679c\u4f60\u7528new\u5173\u952e\u5b57\u6765\u8c03\u7528\u4e00\u4e2a\u65b9\u6cd5\uff0c\u5b83\u4f1a\u521b\u5efa\u5e76\u4e14\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61\u3002\u901a\u8fc7\u4f7f\u7528this\u5173\u952e\u5b57\uff0c\u4f60\u53ef\u4ee5\u5728\u5b83\u8fd4\u56de\u4e4b\u524d\u4fee\u6539\u8fd9\u4e2a\u5bf9\u8c61\u3002\u4f5c\u4e3a\u7ea6\u5b9a\u4fd7\u6210\u7684\u4e60\u60ef\uff0c\u6784\u9020\u51fd\u6570\u7684\u547d\u540d\u901a\u5e38\u4ee5\u4e00\u4e2a\u5927\u5199\u5b57\u6bcd\u5f00\u5934\uff0c\u4ee5\u533a\u5206\u4e8e\u5176\u4ed6\u4e00\u822c\u51fd\u6570\u548c\u65b9\u6cd5\u3002<\/p>\n<p>\u54ea\u4e00\u79cd\u65b9\u5f0f\u66f4\u597d\u5462\uff1f\u5bf9\u8c61\u679a\u4e3e\u8fd8\u662f\u6784\u9020\u51fd\u6570\uff1f\u8fd9\u5b8c\u5168\u53d6\u51b3\u4e8e\u4f60\u6307\u5b9a\u7684\u4efb\u52a1\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u9700\u8981\u521b\u5efa\u8bb8\u591a\u4e0d\u540c\u7684\uff0c\u4f46\u662f\u7c7b\u4f3c\u7684\u5bf9\u8c61\uff0c\u4f7f\u7528\u7c7b\u7c7b\uff08class-like\uff09\u7684\u6784\u9020\u51fd\u6570\u53ef\u80fd\u624d\u662f\u6b63\u786e\u7684\u9009\u62e9\u3002\u4f46\u662f\uff0c\u5982\u679c\u4f60\u7684\u5bf9\u8c61\u66f4\u63a5\u8fd1\u4e8e\u4e00\u4e2a\u5355\u4f8b\uff08singleton\uff09\uff0c\u5bf9\u8c61\u679a\u4e3e\u65b9\u5f0f\u80af\u5b9a\u8981\u66f4\u7b80\u5355\u66f4\u7b80\u77ed\u3002<\/p>\n<p>\u597d\u4e86\uff0c\u5982\u679c\u6ca1\u6709\u7c7b\uff0c\u90a3\u4e48\u54ea\u6765\u7ee7\u627f\u5462\uff1f\u5728\u6211\u4eec\u56de\u7b54\u8fd9\u4e2a\u95ee\u9898\u4e4b\u524d\uff0c\u8fd9\u91cc\u8fd8\u6709\u4e00\u70b9\u60ca\u559c\u2014\u2014\u5728JavaScript\u4e2d\uff0c\u51fd\u6570\uff08function\uff09\u4e5f\u662f\u5b9e\u9645\u5bf9\u8c61\u3002<\/p>\n<p>\uff08\u5b9e\u9645\u4e0a\uff0c\u5728JavaScript\u4e2d\uff0c\u51e0\u4e4e\u6240\u6709\u4e1c\u897f\u90fd\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u51fa\u4e86\u4e00\u4e9b\u5143\u6570\u636e\u7c7b\u578b\u2014\u2014\u5b57\u7b26\u4e32\uff08string\uff09\u3001\u5e03\u5c14\u503c\uff08boolean\uff09\u3001\u6570\u5b57\uff08number\uff09\u548cundefined\u3002\u51fd\u6570\uff08function\uff09\u662f\u5bf9\u8c61\uff0c\u6570\u7ec4\uff08array\uff09\u662f\u5bf9\u8c61\uff0c\u751a\u81f3null\u4e5f\u662f\u4e00\u4e2a\u5bf9\u8c61\u3002\u800c\u4e14\uff0c\u5143\u6570\u636e\u7c7b\u578b\u4e5f\u53ef\u4ee5\u8f6c\u6362\u5e76\u4f5c\u4e3a\u5bf9\u8c61\u4f7f\u7528\uff0c\u56e0\u6b64\u201dstring.length\u201c\u662f\u6709\u6548\u7684\u3002\uff09<\/p>\n<p><b>\u51fd\u6570\u5bf9\u8c61\u548c\u539f\u578b\u5bf9\u8c61<\/b><\/p>\n<p>\u5728JavaScript\u4e2d\uff0c\u51fd\u6570\u662f\u5bf9\u8c61\u3002\u4ed6\u4eec\u53ef\u4ee5\u8d4b\u503c\u7ed9\u53d8\u91cf\uff0c\u4f60\u53ef\u4ee5\u7ed9\u5b83\u4eec\u6dfb\u52a0\u5c5e\u6027\u548c\u65b9\u6cd5\u7b49\u7b49\u3002\u8fd9\u91cc\u662f\u4e00\u4e2a\u51fd\u6570\u7684\u793a\u4f8b\uff1a<\/p>\n<p><pre lang=\"javascript\">\nvar myfunc = function(param) {\n  alert(param);\n};\n<\/pre>\n<\/p>\n<p>\u8fd9\u548c\u4e0b\u9762\u7684\u51e0\u4e4e\u4e00\u6837\uff1a<\/p>\n<p><pre lang=\"javascript\">\nfunction myfunc(param) {\n  alert(param);\n}\n<\/pre>\n<\/p>\n<p>\u4e0d\u7ba1\u4f60\u901a\u8fc7\u4ec0\u4e48\u65b9\u5f0f\u521b\u5efa\u8fd9\u4e2a\u51fd\u6570\uff0c\u5b83\u6700\u540e\u90fd\u6210\u4e3a\u4e86\u4e00\u4e2amyfunc\u5bf9\u8c61\uff0c\u4f60\u53ef\u4ee5\u5f97\u5230\u5b83\u4eec\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\uff1a<\/p>\n<p><pre lang=\"javascript\">\nalert(myfunc.length);     \/\/ \u663e\u793a 1, \u53c2\u6570\u4e2a\u6570\nalert(myfunc.toString()); \/\/ \u663e\u793a\u8fd9\u4e2a\u51fd\u6570\u7684\u6e90\u4ee3\u7801\n<\/pre>\n<\/p>\n<p>\u4e00\u4e2a\u6709\u8da3\u7684\u5c5e\u6027\u662f\u2014\u2014\u6bcf\u4e2a\u51fd\u6570\u5bf9\u8c61\u90fd\u6709\u4e00\u4e2aprototype\u5c5e\u6027\u3002\u4e00\u65e6\u4f60\u521b\u5efa\u4e00\u4e2a\u51fd\u6570\uff0c\u5b83\u5c31\u4f1a\u81ea\u52a8\u83b7\u5f97\u4e00\u4e2aprototype\u5c5e\u6027\uff0c\u8fd9\u4e2a\u5c5e\u6027\u6307\u5411\u4e00\u4e2a\u7a7a\u7684\u5bf9\u8c61\u3002\u5f53\u7136\uff0c\u4f60\u53ef\u4ee5\u4fee\u6539\u90a3\u4e2a\u7a7a\u5bf9\u8c61\u7684\u5c5e\u6027\u3002<\/p>\n<p><pre lang=\"javascript\">\nalert(typeof myfunc.prototype); \/\/ \u663e\u793a &quot;object&quot;\nmyfunc.prototype.test = 1; \/\/ \u8fd9\u662f\u5b8c\u5168\u53ef\u4ee5\u7684\n<\/pre>\n<\/p>\n<p>\u95ee\u9898\u662f\uff1a\u8fd9\u4e2a\u539f\u578b\u5bf9\u8c61\u6709\u4ec0\u4e48\u7528\u5462\uff1f\u53ea\u6709\u5f53\u4f60\u628a\u4e00\u4e2a\u51fd\u6570\u4f5c\u4e3a\u6784\u9020\u51fd\u6570\u8c03\u7528\u6765\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\u65f6\u6709\u7528\u3002\u5f53\u4f60\u8fd9\u4e48\u505a\u7684\u65f6\u5019\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u81ea\u52a8\u5730\u83b7\u5f97\u4e00\u4e2a\u79d8\u5bc6\u94fe\u63a5\u6307\u5411\u539f\u578b\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u5e76\u53ef\u4ee5\u628a\u8fd9\u4e9b\u5c5e\u6027\u5f53\u4f5c\u81ea\u5df1\u7684\u5c5e\u6027\u4e00\u6837\u8bbf\u95ee\u3002\u8ff7\u60d1\u4e86\uff1f\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<p>\u4e00\u4e2a\u65b0\u51fd\u6570\uff1a<\/p>\n<pre lang=\"javascript\">\nfunction ShinyObject(name) {\n  this.name = name;\n}\n<\/pre>\n<\/p>\n<p>\u7ed9\u8fd9\u4e2a\u51fd\u6570\u7684\u539f\u578b\u5c5e\u6027\u589e\u52a0\u4e00\u4e9b\u529f\u80fd\uff1a<\/p>\n<p><pre lang=\"javascript\">\nShinyObject.prototype.getName = function() {\n  return this.name;\n};\n<\/pre>\n<\/p>\n<p>\u628a\u8fd9\u4e2a\u51fd\u6570\u4f5c\u4e3a\u6784\u9020\u51fd\u6570\u4f7f\u7528\uff0c\u6765\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\uff1a<\/p>\n<p><pre lang=\"javascript\">\nvar iphone = new ShinyObject('my precious');\niphone.getName(); \/\/ returns &quot;my precious&quot;\n<\/pre>\n<\/p>\n<p>\u6b63\u5982\u4f60\u6240\u770b\u5230\u7684\uff0c\u65b0\u7684\u5bf9\u8c61\u81ea\u52a8\u83b7\u5f97\u4e86\u539f\u578b\u5bf9\u8c61\u7684\u5c5e\u6027\u3002\u5f53\u4e00\u4e9b\u529f\u80fd\u53ef\u4ee5\u201d\u514d\u8d39\u201c\u5730\u83b7\u5f97\u7684\u65f6\u5019\uff0c\u8fd9\u5c31\u6709\u70b9\u50cf\u662f\u4ee3\u7801\u91cd\u7528\u548c\u7ee7\u627f\u4e86\u3002<\/p>\n<p><b>\u901a\u8fc7\u539f\u578b\u7ee7\u627f<\/b><\/p>\n<p>\u73b0\u5728\u6211\u4eec\u6765\u770b\u770b\uff0c\u4f60\u5982\u679c\u901a\u8fc7\u4f7f\u7528\u539f\u578b\u6765\u5b9e\u73b0\u7ee7\u627f\u3002<\/p>\n<p>\u8fd9\u91cc\u662f\u4e00\u4e2a\u6784\u9020\u51fd\u6570\uff0c\u5c06\u4f1a\u4f5c\u4e3a\u7236\u7c7b\uff08parent\uff09\u4f7f\u7528\uff1a<\/p>\n<p><pre lang=\"javascript\">\nfunction NormalObject() {\n  this.name = 'normal';\n  this.getName = function() {\n    return this.name;\n  };\n}\n<\/pre>\n<\/p>\n<p>\u8fd9\u91cc\u662f\u7b2c\u4e8c\u4e2a\u6784\u9020\u51fd\u6570\uff1a<\/p>\n<p><pre lang=\"javascript\">\nfunction PreciousObject(){\n  this.shiny = true;\n  this.round = true;\n}\n<\/pre>\n<\/p>\n<p>\u73b0\u5728\u662f\u7ee7\u627f\u90e8\u5206\uff1a<\/p>\n<p><pre lang=\"javascript\">\nPreciousObject.prototype = new NormalObject();\n<\/pre>\n<\/p>\n<p>\u53ef\u4e0d\u662f\u561b\uff01\u73b0\u5728\u4f60\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u73cd\u5b9d\uff08precious\uff09\u5bf9\u8c61\uff0c\u7136\u540e\u5b83\u4eec\u4f1a\u5f97\u5230\u6240\u6709\u666e\u901a\u7269\u54c1\uff08normal\uff09\u5bf9\u8c61\u7684\u529f\u80fd\uff1a<\/p>\n<p><pre lang=\"javascript\">\nvar crystal_ball = new PreciousObject();\ncrystal_ball.name = 'Ball, Crystal Ball.';\nalert(crystal_ball.round); \/\/ true\nalert(crystal_ball.getName()); \/\/ &quot;Ball, Crystal Ball.&quot;\n<\/pre>\n<\/p>\n<p>\u6ce8\u610f\u5230\u6211\u4eec\u4e3a\u4ec0\u4e48\u9700\u8981\u4f7f\u7528new\u6765\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\uff0c\u7136\u540e\u628a\u5b83\u8d4b\u503c\u7ed9\u539f\u578b\uff0c\u56e0\u4e3a\u539f\u578b\u4ec5\u4ec5\u53ea\u662f\u4e00\u4e2a\u5bf9\u8c61\u3002\u4e0d\u50cf\u4e00\u4e2a\u6784\u9020\u51fd\u6570\u7ee7\u627f\u4e8e\u5176\u5b83\u7684\uff0c\u672c\u8d28\u4e0a\uff0c\u6211\u4eec\u4ece\u4e00\u4e2a\u5bf9\u8c61\u7ee7\u627f\u3002JavaScript\u6ca1\u6709\u7c7b\u4ece\u5176\u4ed6\u7c7b\u7ee7\u627f\uff0c\u53ea\u6709\u5bf9\u8c61\u4ece\u5176\u4ed6\u5bf9\u8c61\u7ee7\u627f\u3002<\/p>\n<p>\u5982\u679c\u4f60\u6709\u51e0\u4e2a\u6784\u9020\u51fd\u6570\u90fd\u8981\u4eceNormalObject\u7ee7\u627f\uff0c\u4f60\u4e5f\u8bb8\u9700\u8981\u6bcf\u6b21\u90fd\u521b\u5efa\u4e00\u4e2anew NormalObject()\uff0c\u4f46\u662f\u8fd9\u662f\u6ca1\u6709\u5fc5\u8981\u7684\u3002\u751a\u81f3\u8fde\u6574\u4e2aNormalObject\u6784\u9020\u51fd\u6570\u90fd\u4e0d\u662f\u5fc5\u987b\u7684\u3002\u53e6\u5916\u4e00\u79cd\u5b9e\u73b0\u65b9\u5f0f\u5c31\u662f\u521b\u5efa\u4e00\u4e2a\u5355\u4f8b\u666e\u901a\u5bf9\u8c61\uff0c\u7136\u540e\u628a\u5b83\u4f5c\u4e3a\u5176\u4ed6\u5bf9\u8c61\u7684\u57fa\u7c7b\u4f7f\u7528\u3002<\/p>\n<p><pre lang=\"javascript\">\nvar normal = {\n  name: 'normal',\n  getName: function() {\n    return this.name;\n  }\n};\n<\/pre>\n<\/p>\n<p>\u7136\u540ePreciousObject\u5c31\u53ef\u4ee5\u50cf\u8fd9\u6837\u7ee7\u627f\u4e86\uff1a<\/p>\n<p><pre lang=\"javascript\">\nPreciousObject.prototype = normal;\n<\/pre>\n<\/p>\n<p><b>\u901a\u8fc7\u590d\u5236\u5c5e\u6027\u7ee7\u627f<\/b><\/p>\n<p>\u56e0\u4e3a\u7ee7\u627f\u53ea\u662f\u4e3a\u4e86\u4ee3\u7801\u91cd\u7528\uff0c\u56e0\u6b64\u8fd8\u6709\u4e00\u79cd\u5b9e\u73b0\u65b9\u5f0f\u5c31\u662f\u7b80\u5355\u5730\u590d\u5236\u5c5e\u6027\u3002<\/p>\n<p>\u5047\u8bbe\u4f60\u6709\u8fd9\u4e9b\u5bf9\u8c61\uff1a<\/p>\n<p><pre lang=\"javascript\">\nvar shiny = {\n   shiny: true,\n   round: true\n};\n\nvar normal = {\n  name: 'name me',\n  getName: function() {\n    return this.name;\n  }\n};\n<\/pre>\n<\/p>\n<p>\u600e\u6837\u8ba9shiny\u5f97\u5230normal\u7684\u5c5e\u6027\u5462\uff1f\u8fd9\u91cc\u6709\u4e00\u4e2a\u7b80\u5355\u7684extend()\u51fd\u6570\uff0c\u53ef\u4ee5\u5faa\u73af\u904d\u5386\u5e76\u8d4b\u503c\u5c5e\u6027\uff1a<\/p>\n<p><pre lang=\"javascript\">\nfunction extend(parent, child) {\n  for (var i in parent) {\n    child[i] = parent[i];\n  }\n}\n<\/pre>\n<\/p>\n<p><pre lang=\"javascript\">\nextend(normal, shiny); \/\/ inherit\nshiny.getName(); \/\/ &quot;name me&quot;\n<\/pre>\n<\/p>\n<p>\u73b0\u5728\u8fd9\u4e2a\u5c5e\u6027\u8d4b\u503c\u770b\u8d77\u6765\u50cf\u662f\u989d\u5916\u7684\u5f00\u9500\uff0c\u800c\u4e14\u6027\u80fd\u4e5f\u4e0d\u662f\u5f88\u597d\uff0c\u4f46\u662f\u4e8b\u5b9e\u662f\uff0c\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u5b83\u8fd8\u662f\u5f88\u597d\u7684\u3002\u4f60\u4e5f\u53ef\u4ee5\u770b\u89c1\u2014\u2014\u8fd9\u662f\u4e00\u79cd\u5b9e\u73b0\u6df7\u5408\u7ee7\u627f\u548c\u591a\u91cd\u7ee7\u627f\u7684\u7b80\u5355\u65b9\u5f0f\u3002<\/p>\n<p><b>Crockford\u7684beget object<\/b><\/p>\n<p><a href=\"http:\/\/www.crockford.com\/\" target=\"_blank\" title=\"Douglas Crockford\">Douglas Crockford<\/a>\uff0c\u4e00\u4ee3JavaScript\u5927\u5e08\uff0c<a href=\"http:\/\/json.org\/\" target=\"_blank\" title=\"JSON\">JSON<\/a>\u7684\u521b\u9020\u8005\uff0c\u63d0\u51fa\u4e86\u8fd9\u6837\u4e00\u79cd\u6709\u8da3\u7684begetObject()\u65b9\u5f0f\u6765\u5b9e\u73b0\u7ee7\u627f\uff1a<\/p>\n<p><pre lang=\"javascript\">\nfunction begetObject(o) {\n  function F() {}\n  F.prototype = o;\n  return new F();\n}\n<\/pre>\n<\/p>\n<p>\u8fd9\u91cc\u4f60\u521b\u5efa\u4e86\u4e00\u4e2a\u4e34\u65f6\u6784\u9020\u51fd\u6570\uff0c\u56e0\u6b64\u4f60\u53ef\u4ee5\u4f7f\u7528\u539f\u578b\u529f\u80fd\uff0c\u8fd9\u4e2a\u76ee\u7684\u5728\u4e8e\u4f60\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\uff0c\u4e0d\u8fc7\u4e0d\u662f\u4e00\u4e2a\u5168\u65b0\u7684\u5bf9\u8c61\uff0c\u800c\u662f\u4ece\u5176\u5b83\u5bf9\u8c61\u90a3\u91cc\u7ee7\u627f\u4e86\u4e00\u4e9b\u5df2\u7ecf\u5b58\u5728\u7684\u529f\u80fd\u3002<\/p>\n<p>\u7236\u5bf9\u8c61\uff1a<\/p>\n<p><pre lang=\"javascript\">\nvar normal = {\n  name: 'name me',\n  getName: function() {\n    return this.name;\n  }\n};\n<\/pre>\n<\/p>\n<p>\u4e00\u4e2a\u4ece\u7236\u5bf9\u8c61\u7ee7\u627f\u7684\u65b0\u5bf9\u8c61\uff1a<\/p>\n<p><pre lang=\"javascript\">\nvar shiny = begetObject(normal);\n<\/pre>\n<\/p>\n<p>\u7ed9\u8fd9\u4e2a\u65b0\u5bf9\u8c61\u589e\u52a0\u66f4\u591a\u529f\u80fd\uff1a<\/p>\n<p><pre lang=\"javascript\">\nshiny.round = true;\nshiny.preciousness = true;\n<\/pre>\n<\/p>\n<p><b>YUI\u7684extend()<\/b><\/p>\n<p>\u8ba9\u6211\u4eec\u6765\u603b\u7ed3\u4e00\u4e0b\u53e6\u4e00\u79cd\u65b9\u5f0f\u6765\u5b9e\u73b0\u7ee7\u627f\uff0c\u8fd9\u53ef\u80fd\u662f\u6700\u63a5\u8fd1Java\u7684\uff0c\u56e0\u4e3a\u5728\u8fd9\u79cd\u65b9\u6cd5\u4e2d\uff0c\u5b83\u770b\u8d77\u6765\u50cf\u4e00\u4e2a\u6784\u9020\u51fd\u6570\u7ee7\u627f\u81ea\u5176\u5b83\u6784\u9020\u51fd\u6570\uff0c\u56e0\u6b64\u5979\u770b\u8d77\u6765\u6709\u4e00\u70b9\u50cf\u4ece\u4e00\u4e2a\u7c7b\u7ee7\u627f\u3002<\/p>\n<p>\u5728\u975e\u5e38\u53d7\u6b22\u8fce\u7684YUI JavaScript\u5e93\uff08Yahoo! User Interface\uff09\u4e2d\u5df2\u7ecf\u4f7f\u7528\u4e86\u8fd9\u79cd\u65b9\u6cd5\uff0c\u8fd9\u91cc\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u7248\u672c\uff1a<\/p>\n<p><pre lang=\"javascript\">\nfunction extend(Child, Parent) {\n  var F = function(){};\n  F.prototype = Parent.prototype;\n  Child.prototype = new F();\n}\n<\/pre>\n<\/p>\n<p>\u901a\u8fc7\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u4f60\u4f20\u9012\u4e24\u4e2a\u6784\u9020\u51fd\u6570\uff0c\u7b2c\u4e00\u4e2a\uff08\u5b50\u7c7b\uff09\u5c06\u4f1a\u901a\u8fc7\u539f\u578b\uff08prototype\uff09\u5c5e\u6027\u5f97\u5230\u7b2c\u4e8c\u4e2a\uff08\u7236\u7c7b\uff09\u7684\u6240\u6709\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n<p><b>\u603b\u7ed3<\/b><\/p>\n<p>\u8ba9\u6211\u4eec\u5f88\u5feb\u5730\u603b\u7ed3\u4e00\u4e0b\u6211\u4eec\u521a\u624d\u6240\u5b66\u7684\u6709\u5173JavaScript\u7684\u5185\u5bb9\uff1a<\/p>\n<ul style=\"list-style-type:disc\">\n<li>JavaScript\u4e2d\u6ca1\u6709\u7c7b<\/li>\n<li>\u5bf9\u8c61\u4ece\u5bf9\u8c61\u7ee7\u627f<\/li>\n<li>\u5bf9\u8c61\u679a\u4e3e\u8868\u793a\u6cd5 var o = { };<\/li>\n<li>\u6784\u9020\u51fd\u6570\u63d0\u4f9b\u7c7bJava\u8bed\u6cd5 var o = new Object();<\/li>\n<li>\u51fd\u6570\u662f\u5bf9\u8c61<\/li>\n<li>\u6240\u6709\u7684\u51fd\u6570\u5bf9\u8c61\u90fd\u6709\u4e00\u4e2aprototype\u5c5e\u6027<\/li>\n<li>\u6700\u540e\uff0c\u6709\u5f88\u591a\u65b9\u5f0f\u6765\u5b9e\u73b0\u7ee7\u627f\uff0c\u4f60\u53ef\u4ee5\u4efb\u610f\u6311\u9009\uff0c\u8fd9\u5b8c\u5168\u53d6\u51b3\u4e8e\u4f60\u7684\u624b\u5934\u4efb\u52a1\u3001\u4f60\u4e2a\u4eba\u559c\u597d\u3001\u56e2\u961f\u559c\u597d\u3001\u4f60\u7684\u5fc3\u60c5\u6216\u8005\u5f53\u524d\u7684\u6708\u76f8\u3002<\/li>\n<\/ul>\n<p><b>\u4f5c\u8005\u53ca\u58f0\u660e<\/b><\/p>\n<p><a href=\"http:\/\/www.phpied.com\/\" target=\"_blank\" title=\"Stoyan Stefanov\">Stoyan Stefanov<\/a>\u662f\u4e00\u540d\u8d44\u6df1Yahoo!\u5f00\u53d1\u8005\uff0c<a href=\"http:\/\/developer.yahoo.com\/yslow\/\" target=\"_blank\" title=\"YSlow\u5de5\u5177\">YSlow\u5de5\u5177<\/a>\u7684\u9886\u5bfc\u3001\u5f00\u6e90\u8d21\u732e\u8005\uff0c\u535a\u5ba2\u4f5c\u8005\u548c\u6280\u672f\u4f5c\u8005\uff0c\u6700\u8fd1\u7531Packt\u51fa\u7248\u7684<a href=\"http:\/\/www.packtpub.com\/object-oriented-javascript-applications-libraries\/book\" target=\"_blank\" title=\"\u300aObject-Oriented JavaScript\u300b\">\u300aObject-Oriented JavaScript\u300b<\/a>\uff08\u300a\u9762\u5411\u5bf9\u8c61\u7684JavaScript\u300b\uff09\u7684\u4f5c\u8005\u3002<\/p>\n<p>shiny object\u7684\u4f8b\u5b50\u7075\u611f\u6765\u6e90\u4e8eJim Bumgardner\u7684<a href=\"http:\/\/www.krazydad.com\/blog\/2008\/07\/31\/theory-of-the-precious-object\/\" target=\"_blank\" title=\"\u300aTheory of the Precious Object \u300b\">\u300aTheory of the Precious Object \u300b<\/a>\u3002<\/p>\n<p>\u53c2\u8003<a href=\"http:\/\/www.crockford.com\/javascript\/prototypal.html\" target=\"_blank\" title=\"\u300aDouglas Crockford's beget object\u300b \">\u300aDouglas Crockford&#8217;s beget object\u300b <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u7bc7\u6587\u7ae0\u662fYahoo!\u7684\u4e00\u540d\u8d44\u6df1\u5f00\u53d1\u4eba\u5458\u5199\u7684\uff0c\u5bf9\u4e8eJavaScript\u7684\u5f31\u7c7b\u5bf9\u8c61\u53ca\u5176\u7ee7\u627f\u65b9\u5f0f\u8bb2\u5f97\u975e\u5e38\u900f\u5f7b\uff0c\u6587\u7ae0\u5199\u5f97\u5f88\u597d\uff0c\u800c\u81ea\u5df1\u6700\u8fd1\u53c8\u5f88\u6709\u70b9\u7ffb\u8bd1\u6b32\u671b\uff0c\u4e8e\u662f\u4e5f\u4e00\u5e76\u7ffb\u8bd1\u8fc7\u6765\u4e86\u3002\u53e6\u5916\uff0cMooTools 1.2.1\u5df2\u7ecf\u53d1\u5e03\u4e86\uff0c\u4fee\u590d\u4e86\u4e00\u4e9bbug\u3002 \u539f\u6587\u5730\u5740\uff1aJavaScript&#8217;s class-less objects \u8bf7\u5c0a\u91cd\u4e2a\u4eba\u52b3\u52a8\uff0c\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u51fa\u5904\uff1ahttp:\/\/fdream.net\uff0c\u8bd1\u8005\uff1aFdream Java\u548cJavaScript\u662f\u76f8\u5dee\u6781\u5927\u7684\u4e24\u79cd\u8bed\u8a00\uff0c\u5c3d\u7ba1\u4ed6\u4eec\u7684\u540d\u5b57\u975e\u5e38\u50cf\uff0c\u800c\u4e14\u90fd\u6709\u7c7bC\u7684\u8bed\u6cd5\u98ce\u683c\uff0c\u5f88\u591a\u65f6\u5019\u8fd9\u8ba9\u4eba\u4eec\u5f88\u8ff7\u60d1\u3002\uff08Fdream\u6ce8\uff1a\u66fe\u6709\u4eba\u5728\u8bba\u575b\u4e0a\u95eeJava\u548cJavaScript\u662f\u4ec0\u4e48\u5173\u7cfb\uff1f\u6211\u4e00\u5e08\u5144\u7684\u56de\u7b54\u975e\u5e38\u7ecf\u5178\uff1a\u96f7\u950b\u548c\u96f7\u5cf0\u5854\u7684\u5173\u7cfb\u3002\uff09\u6211\u4eec\u6765\u770b\u770b\u4e24\u8005\u6700\u4e3b\u8981\u7684\u533a\u522b\u2014\u2014\u5bf9\u8c61\u662f\u600e\u6837\u521b\u5efa\u7684\u3002\u5728Java\u4e2d\uff0c\u4f60\u6709\u7c7b\u3002\u7136\u540e\u662f\u5bf9\u8c61\uff0c\u53c8\u53eb\u5b9e\u4f8b\uff0c\u90fd\u662f\u57fa\u4e8e\u90a3\u4e9b\u7c7b\u5efa\u7acb\u7684\u3002\u800c\u5728JavaScript\u4e2d\uff0c\u6ca1\u6709\u7c7b\u5b58\u5728\uff0c\u5bf9\u8c61\u66f4\u50cf\u662f\u4e00\u4e2a\u5305\u542b\u952e\u503c\u5bf9\uff08key-value pair\uff09\u7684\u54c8\u5e0c\u8868\uff08hash table\uff09\u3002\u7136\u540e\u7ee7\u627f\u662f\u4ec0\u4e48\u6837\u7684\u5462\uff1f\u597d\uff0c\u6211\u4eec\u4e00\u6b65\u4e00\u6b65\u6765\u3002 JavaScript\u5bf9\u8c61 \u5f53\u4f60\u8003\u8651\u4e00\u4e2aJavaScript\u5bf9\u8c61\u65f6\uff0c\u60f3\u4e00\u4e0bhash\u3002\u5b83\u4eec\u548c\u5bf9\u8c61\u5b8c\u5168\u4e00\u6837\u2014\u2014\u5b83\u4eec\u90fd\u662f\u540d\u503c\u5bf9\uff08name-value pair\uff09\u96c6\u5408\uff0c\u503c\u53ef\u4ee5\u662f\u5176\u5b83\u4efb\u4f55\u4e1c\u897f\uff0c\u5305\u62ec\u5bf9\u8c61\u548c\u51fd\u6570\u3002\u5f53\u4e00\u4e2a\u5bf9\u8c61\u7684\u5c5e\u6027\u662f\u51fd\u6570\u7684\u65f6\u5019\uff0c\u4f60\u4e5f\u53ef\u4ee5\u53eb\u5b83\u4eec\u65b9\u6cd5\u3002 \u8fd9\u662f\u4e00\u4e2a\u7a7a\u5bf9\u8c61\uff1a var myobj = {}; \u73b0\u5728\uff0c\u4f60\u53ef\u4ee5\u5f00\u59cb\u7ed9\u8fd9\u4e2a\u5bf9\u8c61\u6dfb\u52a0\u4e00\u4e9b\u6709\u610f\u4e49\u7684\u529f\u80fd\uff1a myobj.name = &quot;My precious&quot;; myobj.getName = function() {return this.name}; \u6ce8\u610f\u8fd9\u6837\u4e00\u4e9b\u4e8b\u60c5\uff1a \u5728\u65b9\u6cd5\u4e2d\uff0cthis\u6307\u5411\u5f53\u524d\u5bf9\u8c61\uff0c\u548c\u671f\u671b\u4e00\u6837 \u4f60\u53ef\u4ee5\u5728\u4efb\u4f55\u65f6\u5019\u6dfb\u52a0\u3001\u4fee\u6539\u3001\u5220\u9664\u5c5e\u6027\uff0c\u4e0d\u9650\u4e8e\u521b\u5efa\u7684\u65f6\u5019 \u53e6\u4e00\u79cd\u521b\u5efa\u5bf9\u8c61\u5e76\u540c\u65f6\u6dfb\u52a0\u5c5e\u6027\u6216\u8005\u65b9\u6cd5\u7684\u65b9\u5f0f\u662f\u8fd9\u6837\u7684\uff1a var another = { name: &#8216;My other precious&#8217;, getName: function() { return this.name; } }; \u8fd9\u79cd\u8bed\u6cd5\u5c31\u53eb\u505a\u201c\u5bf9\u8c61\u679a\u4e3e\u8868\u793a\u6cd5\u201d\uff08object literal notation\uff09\u2014\u2014\u4f60\u628a\u6240\u6709\u7684\u4e1c\u897f\u90fd\u5305\u542b\u5728\u82b1\u62ec\u53f7 { \u548c } \u4e4b\u95f4\uff0c\u5e76\u7528\u9017\u53f7\u5728\u5bf9\u8c61\u5185\u90e8\u533a\u5206\u6bcf\u4e2a\u5c5e\u6027\u3002\u952e\u503c\u5bf9\uff08key:value pair\uff09\u5219\u4ee5\u5192\u53f7\u5206\u5272\u3002\u8fd9\u4e2d\u8bed\u6cd5\u4e5f\u4e0d\u662f\u521b\u5efa\u5bf9\u8c61\u7684\u552f\u4e00\u65b9\u5f0f\u3002 \u6784\u9020\u51fd\u6570 &hellip; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[104],"class_list":["post-604","post","type-post","status-publish","format-standard","hentry","category-coding","tag-JavaScript"],"views":5853,"_links":{"self":[{"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/posts\/604","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/comments?post=604"}],"version-history":[{"count":0,"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/posts\/604\/revisions"}],"wp:attachment":[{"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/media?parent=604"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/categories?post=604"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/tags?post=604"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}