ajxa请求对象

//XMLHttpRequest
var xmlhttp = false;
function createXMLHttpRequest()
{
    if (window.XMLHttpRequest)
    {
        // Mozilla, Safari, ...
        xmlhttp = new XMLHttpRequest();
    }
    else if (window.ActiveXObject)
    {
        // IE
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
}

///请求服务器获得相对应的数据源
function sendNewsReads(SelectValuesInfo)
{
    createXMLHttpRequest();
    var  url="../AJAX/newsNewsReads.aspx?ID="+SelectValuesInfo+'&?mathID='+Math.random()*100000;
   
    xmlhttp.open("GET",url,true);
    xmlhttp.send(null);
    xmlhttp.onreadystatechange=function(){
        if (4==xmlhttp.readyState){
            if (200==xmlhttp.status){
              
              $("#newssorcesNewsReads").html(xmlhttp.responseText);
                return true;
            }else{
              $("#newssorcesNewsReads").html("1");
                return false;
            }
        }
    }
}