var xmlhttp2;
var respone="";
function getListDataSource(_url){
  var url = _url;
  if(xmlhttp2&&xmlhttp2.readyState!=0&&xmlhttp2.readyState!=4){
       xmlhttp2.abort()
    }
    if(xmlhttp2)xmlhttp2.onreadystatechange=function(){};
    xmlhttp2 = getXMLHttpRequest();
    
    if(typeof(xmlhttp2) == "undefined"){
        alert("您的浏览器禁止了ActiveXObject的功能，请开放该项权限后再进行操作！");
        return ;
    }
    xmlhttp2.open("GET",_url, true);    
    xmlhttp2.onreadystatechange=function(){
         if(xmlhttp2.readyState == 4 ){
            if (xmlhttp2.status==200){
              if(xmlhttp2.responseText!=null&&xmlhttp2.responseText!="")
              {
              //alert(_url);
             // alert(xmlhttp2.responseText);
              respone=xmlhttp2.responseText;
              }
             }
         }
    };
    xmlhttp2.send(null); 
    return respone; 
}
function getXMLHttpRequest(){
    var MSXML = [ 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP','MSXML2.XMLHTTP.6.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP.5.0', 'MSXML2.XMLHTTP.4.0']; 
    var a ; 
    for(var n = 0; n < MSXML.length; n++)
    { 
        try
        { 
	        a = new ActiveXObject(MSXML[n]); 
	        break; 
        }
        catch(e){
        }
        
     } 
     if(typeof(a)=="undefined"){
     try{
        a = new XMLHttpRequest;
     } catch(e){}
     }
    
     return a;
  }