AJAX之xmlHttp

<script type="text/javascript" language="javascript">

<!--

//以XML求取数据

function XmlPost(theEmail)

{

var webFileUrl = "../User/CheckUser.aspx?LogonName=" + theEmail;

var result = "";

if (window.ActiveXObject) {

xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");

}

else if (window.XMLHttpRequest) {

xmlHttp = new XMLHttpRequest();

}

//var xmlHttp = new ActiveXObject("MSXML2.XMLHTTP");

xmlHttp.open("POST", webFileUrl, false);

xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");

xmlHttp.send("");

xmlHttp.onreadystatechange=function()

{

if (xmlHttp.readyState==4)

{

result = xmlHttp.responseText;

}

}

if(xmlHttp.status!=200)

{

alert ('网络故障(xmlHttp.status='+xmlHttp.status+')，请稍后再试！');