Ajax 的格式

var XMLHTTP;
function createXMLHttpRequest()   //创建AJAX
{
if(window.ActiveXObject)
{
XMLHTTP=new ActiveXObject("Microsoft.XMLHTTP");
}
else if(window.XMLHttpRequest)
{
xmlHttp=new XMLHttpRequest();
}
}

function  startRequest(url)  //开始AJAX
{

createXMLHttpRequest();
XMLHTTP.onreadystatechange=handleStateChange;
XMLHTTP.open("GET",url,true);
XMLHTTP.send(null);

}

function handleStateChange()
{
if(XMLHTTP.readyState==4) {
alert(XMLHTTP.status);
if(XMLHTTP.status==200){

PanduanBackZhi();
}
}
}

function PanduanBackZhi()
{
if(XMLHTTP.responseText=="从数据库载出")
{
document.getElementById('Xianshi').innerHTML="<img border=\"0\" src=\"../images/ajaxloading.gif\"><font color=#FF0000 sytle=font-weight:bold>准备从SQL导出数据,请稍等......</font>";
document.getElementById('Button2').disabled=false;
}

if(XMLHTTP.responseText=="从EXCEL 导出")
{
document.getElementById('Xianshi').innerHTML="<img border=\"0\" src=\"../images/ajaxloading.gif\"><font color=#FF0000 sytle=font-weight:bold>准备DATATABLE导出数据,请稍等......</font>";
document.getElementById('Button1').disabled=false;
}
}

function Diaoyong(panduan)
{
startRequest("../AJAXExcel.aspx?id="+panduan+"");
}