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<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
   <title>xmlhttprequest ajax demo</title>
    <script type ="text/javascript" language ="javascript" >
        var req; //¶¨Òå±äÁ¿£¬ÓÃÀ´´´½¨xmlhttprequest¶ÔÏó
        function creatReq() // ´´½¨xmlhttprequest,ajax¿ªÊ¼
        {
            var url="ajaxServer.aspx"; //ÒªÇëÇóµÄ·þÎñ¶ËµØÖ·
            if(window.XMLHttpRequest) //·ÇIEä¯ÀÀÆ÷¼°IE7(7.0¼°ÒÔÉϰ汾)£¬ÓÃxmlhttprequest¶ÔÏó´´½¨
            {
                req=new XMLHttpRequest();
            }
            else if(window.ActiveXObject) //IE(6.0¼°ÒÔϰ汾)ä¯ÀÀÆ÷ÓÃactivexobject¶ÔÏó´´½¨,Èç¹ûÓû§ä¯ÀÀÆ÷½ûÓÃÁËActiveX,¿ÉÄÜ»áʧ°Ü.            {
                req=new ActiveXObject("Microsoft.XMLHttp");
            }
            
            if(req) //³É¹¦´´½¨xmlhttprequest
            {
                req.open("GET",url,true); //


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