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<head runat="server">
    <title>ÎÞ±êÌâÒ³</title>
    <script src="Ajax.js" type="text/javascript"></script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <input id="Name" type="text" onblur="CheckName(this.value)"/>
        <br />
        <div id="TipForName"></div>
    </div>
    </form>
</body>
</html>
"Ajax.js"ÎļþÀïÃæµÄ´úÂë
var xmlHttp;//È«¾ÖXMLHttpResquest¶ÔÏó
//Õë¶Ô²»Í¬ä¯ÀÀÆ÷£¬»ñÈ¡XMLHttpRequest¶ÔÏó
function CreateXMLHttpRequest()
{
    if(window.ActiveXObject)
    {
        xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
    else
    {
        xmlHttp=new XMLHttpResquest();
    }
}
//µ¥»÷btnSayHelloʱµ÷ÓõÄJSº¯Êý
function CheckName(name)
{
    //´´½¨XMLHTTPRquest¶ÔÏó
    CreateXMLHttpRequest();
   
    //Ö¸¶¨»Øµ÷º¯Êý
    xmlHttp.onreadystatechange=HandleStateChange;
   
    //´ò¿ªÇëÇó
//    var s="Output.aspx?id="+name;
    xmlHttp.open("POST","Output.aspx",true);
   
    xmlHttp.setRequestHeader('Content-type','application/x-www-form-urlencoded');
   
    //·¢ËÍÇëÇó
    xmlHttp.send("id="+name);
   
}
//»Øµ÷º¯Êý
function HandleStateChange()
{
//    alert(xmlHttp.readyState);
    if(xmlHttp.readyState==4)
    {
      


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 Ô­ÎĵØÖ·¡¿Announcing the Microsoft AJAX CDN
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