//创建XMLHttpRequest对象 
var request = false; 
try { 
 request = new XMLHttpRequest(); 
} catch (trymicrosoft) { 
 try { 
 request = new ActiveXObject("Msxml2.XMLHTTP"); 
 } catch (othermicrosoft) { 
 try { 
 request = new ActiveXObject("Microsoft.XMLHTTP"); 
 } catch (failed) { 
 request = false; 
 } 
 } 
} 
if (!request)alert("Error initializing XMLHttpRequest!"); 
function ajaxFun(urlNum,IDNum){
//获取信息 
function getInfo(urlNum) { 
 var url = urlNum
 request.open("GET", url, true); 
 request.onreadystatechange = updatePage; 
 request.send(null); 
} 

//更新页面 
function updatePage(ID) { 
 if (request.readyState == 4) { 
 if (request.status == 200) { 
 var response = request.responseText; 
 document.getElementById("divLoader"+IDNum).innerHTML= response; 
 }else if(request.status == 404) { 
 alert ("Requested URL is not found."); 
 } else if (request.status == 403) { 
 alert("Access denied."); 
 } else 
 alert("status is " + request.status); 
 } 
} 

getInfo(urlNum);
 updatePage(IDNum) ;
}