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var xmlHttp;
var flag = false;
function createXMLHttpRequest()
{
  if(window.ActiveXObject)
  {
    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
  else if(window.XMLHttpRequest)
  {
  xmlHttp=new XMLHttpRequest();
  }
}
function getResults()
{
createXMLHttpRequest();
xmlHttp.onreadystatechange=handleStateChange;
var url = "xxxx.do?timeStamp=" + new Date().getTime();
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}
function handleStateChange()
{
    if(xmlHttp.readyState==4)
    {
    if(xmlHttp.status==200)
    {
      var text = xmlHttp.responseText ;
    if(null != text)
    {
    //±íʾajax¶ÁÈ¡³É¹¦ÁË.
    }
    }
    // Èç¹û²éѯȫ²¿½áÊø£¬ÔòÌø×ªµ½²éѯ½á¹ûÕ¹Ê¾Ò³Ãæ
    if(flag)
    {
      window.location = "xxxx.do";
    }
  }
}


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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":$( ......

AJAXµÄjs´úÂë

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//Õâ¸ö·½·¨½«Ê¹ÓÃXMLHTTPRequest¶ÔÏóÀ´½øÐÐAJAXµÄÒì²½Êý¾Ý½»»¥
var xmlhttp;
function verify() {
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ajax´´½¨¶ÔÏó

function createXMLHttpRequest(){     
if(window.ActiveXObject){     
        http = new ActiveXObject("Microsoft.XMLHTTP");     
        }else if(window.XMLHttpRequest){     
& ......

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<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
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1£º¼Óʱ¼ä´Á var url ......
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