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    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>AJAX ¼¼Êõ¼òµ¥Ó¦ÓÃ</title>
        <script type="text/javascript">
            var xmlhttp ;
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            function creatXMLHttpRequest(){
                if(window.XMLHttpRequest){
                    //IE7 IE8 FireFox Mozillar Safari ,Opera
                    xmlhttp=new XMLHttpRequest();
                    //alert("XMLHttpRequest");
                    if(xmlhttp.overrideMimeType){
                        xmlhttp.overrideMimeType("text/xml");
                      
                    }
                }
                else if(window.ActiveXObject){


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