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 2 var SimpleHandler = function(){};
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 4 SimpleHandler.prototype = {
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 6     request:function(method,url,callback,postVars){
 7         var xhr = this.createXhrObject();
 8         xhr.onreadystatechange = function(){
 9             if(xhr.readyState != 4) return;
10             (xhr.status == 200) ? 
11             //¶¨ÒåÁËÒ»¸öÈ«¾Ö¶ÔÏócallbackÀ´Ö´ÐжԷµ»Ø²ÎÊýµÄÓ¦ÓÃ
12             callback.success(xhr.responseText,xhr.responseXML):
13             callback.failure(xhr.status);
14         };
15         xhr.open(method,url,true);
16         if(method != "POST") postVars = null;
17         xhr.send(postVars);
18     },
19 //µÚ¶þ¸ö¼òµ¥¹¤³§ÊǸù¾Ý²»Í¬µÄÇé´´½¨XHR¶ÔÏ󣬲»ÂÛʲôÇé¿öËû¶¼ÄÜ·µ»ØÒ»¸öÕýÈ·µÄXHR¶ÔÏó
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