{"id":182,"date":"2008-10-15T11:01:19","date_gmt":"2008-10-15T03:01:19","guid":{"rendered":"http:\/\/www.xujiwei.com\/blog\/?p=182"},"modified":"2010-01-29T20:56:51","modified_gmt":"2010-01-29T12:56:51","slug":"becareful-with-somefunction-prototype","status":"publish","type":"post","link":"https:\/\/xujiwei.com\/blog\/2008\/10\/becareful-with-somefunction-prototype\/","title":{"rendered":"[JavaScript] \u614e\u7528 somefunction.prototype"},"content":{"rendered":"<p>\u5728\u5199\u00a0JavaScript\u00a0\u811a\u672c\u7684\u65f6\u5019\uff0c\u4e3a\u4e86\u521b\u5efa\u4e00\u4e2a\u7c7b\uff0c\u5982\u679c\u4e0d\u4f7f\u7528\u6846\u67b6\uff0c\u4e00\u822c\u60c5\u51b5\u6211\u4eec\u90fd\u4f1a\u4f7f\u7528\u00a0prototype\u00a0\u6765\u7ed9\u8981\u521b\u5efa\u7684\u7c7b\u589e\u52a0\u516c\u6709\u65b9\u6cd5\uff0c\u4f8b\u5982\uff1a<\/p>\n<div class=\"codeHead\">\u7a0b\u5e8f\u4ee3\u7801\uff1a<a href=\"javascript:CopyText($('CODE_5214'));\">[ \u590d\u5236\u4ee3\u7801\u5230\u526a\u8d34\u677f ]<\/a><\/div>\n<div id=\"CODE_5214\" class=\"codeMain\">\n<ul>\n<li>\/\/\u00a0code\u00a0from\u00a0xujiwei.cn<\/li>\n<li>function\u00a0Person(name)\u00a0{<\/li>\n<li> this.Name\u00a0=\u00a0name;<\/li>\n<li>}<\/li>\n<li>Person.prototype.SayHello\u00a0=\u00a0function()\u00a0{<\/li>\n<li> alert('Hello,\u00a0'\u00a0+\u00a0this.Name);<\/li>\n<li>}<\/li>\n<li>Person.prototype.SayBye\u00a0=\u00a0function()\u00a0{<\/li>\n<li> alert('Goodbye,\u00a0'\u00a0+\u00a0this.Name);<\/li>\n<li>}<\/li>\n<\/ul>\n<\/div>\n<p>\u4e0d\u8fc7\uff0c\u6709\u7684\u65f6\u5019\uff0c\u4e3a\u4e86\u4e66\u5199\u4ee5\u53ca\u7ef4\u62a4\u7684\u65b9\u4fbf\uff0c\u6211\u4eec\u4f1a\u628a\u516c\u6709\u65b9\u6cd5\u7684\u58f0\u660e\u5199\u5230\u4e00\u4e2a\u5bf9\u8c61\u91cc\uff0c\u7136\u540e\u8d4b\u503c\u7ed9\u00a0Person.prototype\uff0c\u4f8b\u5982\uff1a<\/p>\n<div class=\"codeHead\">\u7a0b\u5e8f\u4ee3\u7801\uff1a<a href=\"javascript:CopyText($('CODE_5694'));\">[ \u590d\u5236\u4ee3\u7801\u5230\u526a\u8d34\u677f ]<\/a><\/div>\n<div id=\"CODE_5694\" class=\"codeMain\">\n<ul>\n<li>\/\/\u00a0code\u00a0from\u00a0xujiwei.cn<\/li>\n<li>function\u00a0Person(name)\u00a0{<\/li>\n<li> this.Name\u00a0=\u00a0name;<\/li>\n<li>}<\/li>\n<li>Person.prototype\u00a0=\u00a0{<\/li>\n<li> SayHello:\u00a0function()\u00a0{<\/li>\n<li> alert('Hello,\u00a0'\u00a0+\u00a0this.Name);<\/li>\n<li> },<\/li>\n<li> SayBye:\u00a0function()\u00a0{<\/li>\n<li> alert('Goodbye,\u00a0'\u00a0+\u00a0this.Name);<\/li>\n<li> }<\/li>\n<li>}<\/li>\n<\/ul>\n<\/div>\n<p>\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\uff0c\u5728\u8fd9\u4e2a\u7c7b\u5177\u6709\u5927\u91cf\u516c\u6709\u65b9\u6cd5\u7684\u65f6\u5019\uff0c\u5c31\u4e0d\u9700\u8981\u7ef4\u62a4\u8bb8\u591a\u7684\u00a0Person\u00a0\u6807\u8bc6\u7b26\uff0c\u5982\u679c\u67d0\u4e00\u5929\u8fd9\u4e2a\u7c7b\u7684\u540d\u5b57\u9700\u8981\u6539\u53d8\uff0c\u90a3\u4e48\u8981\u6539\u7684\u5730\u65b9\u53ea\u6709\u4e24\u4e2a\uff0c\u4e00\u4e2a\u662f\u00a0function\u00a0\u7684\u58f0\u660e\uff0c\u4e00\u4e2a\u662f\u00a0prototype\u00a0\u524d\u9762\u7684\u6807\u8bc6\u7b26\uff0c\u5982\u679c\u662f\u4f7f\u7528\u524d\u4e00\u79cd\u65b9\u5f0f\u7684\u8bdd\uff0c\u90a3\u4e48\u6709\u591a\u5c11\u4e2a\u516c\u6709\u65b9\u6cd5\uff0c\u5c31\u9700\u8981\u7ef4\u62a4\u00a0N+1\u00a0\u4e2a\u6807\u8bc6\u7b26\u4e86\uff0c\u867d\u7136\u53ef\u4ee5\u4f7f\u7528\u67e5\u627e\u66ff\u6362\uff0c\u4f46\u662f\u4ece\u7a33\u5b9a\u4e0a\u6765\u8bf4\uff0c\u67e5\u627e\u66ff\u6362\u53ef\u80fd\u4f1a\u5f15\u8d77\u4e00\u4e9b\u9519\u8bef\uff0c\u8fd9\u589e\u52a0\u4e86\u7ef4\u62a4\u7684\u6210\u672c\u3002<\/p>\n<p>\u8fd9\u79cd\u65b9\u5f0f\u867d\u7136\u7ed9\u6211\u4eec\u7684\u7ef4\u62a4\u589e\u52a0\u4e86\u4fbf\u5229\uff0c\u4f46\u4e5f\u5f15\u53d1\u4e86\u53e6\u5916\u4e00\u4e2a\u9690\u85cf\u7684\u95ee\u9898\uff0c\u5c31\u662f<strong>\u7c7b\u7684\u00a0constructor\u00a0\u5c5e\u6027\u4e22\u5931\u7684\u95ee\u9898<\/strong>\u3002<\/p>\n<div class=\"codeHead\">\u7a0b\u5e8f\u4ee3\u7801\uff1a<a href=\"javascript:CopyText($('CODE_5936'));\">[ \u590d\u5236\u4ee3\u7801\u5230\u526a\u8d34\u677f ]<\/a><\/div>\n<div id=\"CODE_5936\" class=\"codeMain\">\n<ul>\n<li>\/\/\u00a0code\u00a0from\u00a0xujiwei.cn<\/li>\n<li>function\u00a0Person1(name)\u00a0{<\/li>\n<li> this.Name\u00a0=\u00a0name;<\/li>\n<li>}<\/li>\n<li>Person1.prototype.SayHello\u00a0=\u00a0function()\u00a0{<\/li>\n<li> alert('Hello,\u00a0'\u00a0+\u00a0this.Name);<\/li>\n<li>}<\/li>\n<li>Person1.prototype.SayBye\u00a0=\u00a0function()\u00a0{<\/li>\n<li> alert('Goodbye,\u00a0'\u00a0+\u00a0this.Name);<\/li>\n<li>}<\/li>\n<li>\/\/\u00a0code\u00a0from\u00a0xujiwei.cn<\/li>\n<li>function\u00a0Person2(name)\u00a0{<\/li>\n<li> this.Name\u00a0=\u00a0name;<\/li>\n<li>}<\/li>\n<li>Person2.prototype\u00a0=\u00a0{<\/li>\n<li> SayHello:\u00a0function()\u00a0{<\/li>\n<li> alert('Hello,\u00a0'\u00a0+\u00a0this.Name);<\/li>\n<li> },<\/li>\n<li> SayBye:\u00a0function()\u00a0{<\/li>\n<li> alert('Goodbye,\u00a0'\u00a0+\u00a0this.Name);<\/li>\n<li> }<\/li>\n<li>}<\/li>\n<li>alert(new\u00a0Person1('Bill').constructor);<\/li>\n<li>alert(new\u00a0Person2('Steve').constructor);<\/li>\n<\/ul>\n<\/div>\n<p>\u8fd0\u884c\u4e0a\u9762\u7684\u6d4b\u8bd5\u4ee3\u7801\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\uff0cPerson1\u00a0\u7684\u00a0constructor\u00a0\u5c5e\u6027\u4e3a\u00a0Person1\u00a0\u7c7b\u7684\u6784\u9020\u51fd\u6570\uff0c\u4f46\u662f\u00a0Person2\u00a0\u7684\u00a0constructor\u00a0\u5c5e\u6027\u5374\u662f\u00a0Object\uff0c\u90a3\u4e48\u5728\u9700\u8981\u4f7f\u7528\u00a0constructor\u00a0\u5c5e\u6027\u6765\u5224\u65ad\u5bf9\u8c61\u7c7b\u578b\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u51fa\u73b0\u95ee\u9898\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u5728\u5199\u00a0JavaScript\u00a0\u7c7b\u7684\u65f6\u5019\uff0c\u5982\u679c\u4e0d\u9700\u8981\u4f7f\u7528\u00a0constructor\u00a0\u5c5e\u6027\u6765\u83b7\u53d6\u5bf9\u8c61\u7684\u7c7b\u578b\uff0c\u90a3\u4e48\u4e2a\u4eba\u6bd4\u8f83\u503e\u5411\u4e8e\u4f7f\u7528\u7b2c\u4e8c\u79cd\u5199\u6cd5\uff0c\u4f46\u662f\u5982\u679c\u9700\u8981\u4f7f\u7528\u00a0constructor\u00a0\u5c5e\u6027\u4ee5\u5b9e\u73b0\u81ea\u5df1\u7684\u53cd\u5c04\u673a\u5236\u6216\u00a0GetType\u00a0\u51fd\u6570\u7b49\u7b49\uff0c\u90a3\u4e48\u5c31\u8981\u4f7f\u7528\u7b2c\u4e00\u79cd\u5199\u6cd5\u3002<\/p>\n<p>\u5f53\u7136\uff0c\u5982\u679c\u5728\u5b9e\u73b0\u81ea\u5df1\u53cd\u5c04\u673a\u5236\u6216\u00a0GetType\u00a0\u51fd\u6570\u65f6\u5e76\u4e0d\u4f9d\u8d56\u00a0constructor\u00a0\u5c5e\u6027\uff0c\u90a3\u4e48\u4e24\u79cd\u5199\u6cd5\u90fd\u662f\u53ef\u4ee5\u7684\u4e86\uff0c\u4f8b\u5982\u989d\u5916\u7ef4\u62a4\u4e00\u4e2a\u6210\u5458\u53d8\u91cf\uff0c\u7528\u4e8e\u6807\u8bc6\u81ea\u8eab\u7684\u7c7b\u578b\u7b49\u3002\u4e5f\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e9b\u73b0\u6210\u7684JS\u6846\u67b6\uff0c\u6709\u4e00\u4e9b\u6846\u67b6\u5df2\u7ecf\u5b9e\u73b0\u4e86JS\u4e2d\u7c7b\u7684\u5b9e\u73b0\u7b49\uff0c\u4f8b\u5982\u00a0js.class\uff0c\u8fd9\u5c31\u770b\u4e2a\u4eba\u9700\u8981\u8fdb\u884c\u53d6\u820d\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u5199\u00a0JavaScript\u00a0\u811a\u672c\u7684\u65f6\u5019\uff0c\u4e3a\u4e86\u521b\u5efa\u4e00\u4e2a\u7c7b\uff0c\u5982\u679c\u4e0d\u4f7f\u7528\u6846\u67b6\uff0c\u4e00\u822c\u60c5\u51b5 &hellip;<\/p>\n<p class=\"read-more\"><a href=\"https:\/\/xujiwei.com\/blog\/2008\/10\/becareful-with-somefunction-prototype\/\">\u7ee7\u7eed\u9605\u8bfb &raquo;<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[11],"tags":[28,108,25],"_links":{"self":[{"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/posts\/182"}],"collection":[{"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/comments?post=182"}],"version-history":[{"count":0,"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/posts\/182\/revisions"}],"wp:attachment":[{"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/media?parent=182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/categories?post=182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xujiwei.com\/blog\/wp-json\/wp\/v2\/tags?post=182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}