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function sendAsynchronRequest(url,parameter,callback){
 createXMLHttpRequest();
 if(parameter == null){
  xmlHttp.onreadystatechange = callback;
  xmlHttp.open("GET",url,true);//µ±GETÇëÇóʱ£¬ÔÚµØÖ·À¸ÖÐÊÇ´ø²ÎÊýµÄ£¬¶ø²ÎÊýΪNULL£¬ËùÒÔÓÃgetÇëÇó£¬send(null)
  xmlHttp.send(null);
 }else{
  xmlHttp.onreadystatechange = callback;
  xmlHttp.open("POST",url,true);//get
  xmlHttp.setRequestHeader(
  "Content-Type","application/x-www-form-urlencoded;");
  xmlHttp.send(parameter);//µ±POSTÇëÇóʱ£¬ÔÚµØÖ·À¸ÖÐÊÇwu²ÎÊýµÄ£¬¶ø²ÎÊý !=NULL£¬ËùÒÔÓÃÉèÖÃΪPOSTÇëÇó£¬send(parameter)
 }
}


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µÚÒ»²½£ºweb.config
<system.web>
    <httpHandlers>    
      <add verb ......

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<scrīpt Language="Javascrīpt">
<!--
// author:±¼ÌÚµÄÐÄ
//     qq:7180001
function Ajax(OnError,OnState,OnDownloadEnd)
{
        this.ErrorStr                 = null;
        ......

ASP.NET+Ajax+JavascriptʵÏÖÒ³Ãæ¶¨´Îˢйö¶¯ÄÚÈÝ

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<mce:script type="text/javascript"><!--
function login(){
var postURL = "http://localhost:8080/cas/simpleLogin";
var params = {
"loginUrl":$("#loginUrl").val(),
"service":$("#service").val(),
"login":$( ......
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