Ajax占用内存不释放的问题,终于被我解决了,绝对保证有效

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以下是正文:
function 函数名称(){
      delete xmlhttp ;
      var xmlhttp;
      if (xmlhttp==null || typeof(xmlhttp)!="object"){
            try{
                  xmlhttp= new ActiveXObject('Msxml2.XMLHTTP');
            }catch(e){
                  try{
                        xmlhttp= new ActiveXObject('Microsoft.XMLHTTP');
                  }catch(e){
                        try{
                              xmlhttp= new XMLHttpRequest();
                        }catch(e){}
                  }
            }
      }
      xmlhttp.onreadystatechange=function(){
            if (4==xmlhttp.readyState){
                  if (200==xmlhttp.status){
                        var manage_online_str=xmlhttp.responseText;
                        //这里是你要进行处理的代码
                  }
            //以下这3行代码重要,而且位置一定要在这里,释放内存主要就靠它了,注:这3行代码的位置一定要在if (4==xmlhttp.readyState){}里,否则无效或效果不好.
delete xmlhttp ;
            xmlhttp=null;
            CollectGarbage;
///////////////////////////////////
            }
      }
      xmlhttp.open("post", "*.asp", true);
      xmlhttp.setRequestHeader("CONTENT-TYPE","application/x-www-form-urlencoded;text/xml;charset=GB2312");
      xmlhttp.send();
      CollectGarbage();
      clearTimeout(this);
}
window.setInterval("client_manage_online()",1000);