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function Ajax(){
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this.method = "";//ÒªÇëÇóµÄÀàÐÍ
this.xRequest = null;//ÉùÃ÷Ò»¸öXMLHttpRequestä¯ÀÀÆ÷ÄÚÖÃÇëÇó¶ÔÏó
this.success = null;//ÇëÇó³É¹¦Òª´¦ÀíµÄº¯Êý
this.failure = null;//ÇëÇóʧ°ÜÒª´¦ÀíµÄº¯Êý
this.params = null;//ÇëÇóʱҪ´«µÝµÄ²ÎÊý
//´´½¨ÇëÇó¶ÔÏó
this.CreateXmlHttpRequest = function(){
try{
//´´½¨¾É°æ±¾µÄIEÇëÇó¶ÔÏó
this.xRequest = new ActiveXObject("Msxml2.XMLHTTP");
}catch(e){
try{
if(window.XmlHttpRequest){
//´´½¨Ð°汾IEÇëÇó¶ÔÏó
this.xRequest = new XMLHttpRequest();
}else if(typeof ActiveXOject != "undefined"){
//´´½¨com×齨
this.xRequest = new ActiveXObject("Microsoft.XMLHTTP");
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