Ajax请求状态200没有返回值,关于AJAXRequest的问题，为什么第二个get请求没有接受到返回值...

function deadlinkMonitor(taskid,siteurl)

{

//debugger;

//updatestatus(taskid);

var ajax = new AJAXRequest();

ajax.async = true;//异步AJAX

ajax.get(

"updatestatu.jsp?taskid="+taskid+"",

function(obj){

var res = obj.responseText;

if(res)

{

window.location.href ='/monitor/madmin/checkbot/list.jsp?tasktype=';

}

});

ajax.async = false;//异步AJAX

ajax.get(

"deadlink.jsp?siteurl="+siteurl+"&taskid="+taskid+"",

function(obj){

var res = obj.responseText;

if(res)

{

window.location.href ='/monitor/madmin/checkbot/list.jsp?tasktype=';

}

});

}