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var xmlhttp;

function verify()
{
   //2.´´½¨XmlHttpRequest¶ÔÏó
   //ÕâÊÇXmlHttpRequest¶ÔÏóÎå²½ÖÐʹÓÃ×ÔÓµÄÒ»²½
   //ÐèÒªÕë¶ÔIEºÍÆäËûÀàÐ͵Ää¯ÀÀÆ÷½¨Á¢Õâ¸ö¶ÔÏóµÄ²»Í¬·½Ê½Ð´²»Í¬µÄ´úÂë
   if(window.XMLHttpRequest)
   {
       //Õë¶ÔFireFox,Mozillar,Opera(ÊÖ»ú),Safari(Æ»¹ûϵͳ),IE7,IE8
       xmlhttp = new XMLHttpRequest();//×¢ÒâÕâÀïËùÓÐ×Öĸ´óСд²»ÄÜ´í
       if(xmlhttp.overrideMimeType)
       {
           //Õë¶ÔÄ³Ð©ÌØ¶¨°æ±¾µÄmozillarµÄä¯ÀÀÆ÷µÄbug½øÐÐÐÞÕý
           xmlhttp.overrideMimeType("text/xml");
       }
   }
   else if(window.ActiveXObject)  //×¢ÒâÕâÀïËùÓÐ×Öĸ´óСд²»ÄÜ´í
   {
           //Õë¶ÔIE6,IE5.5,IE5
       //Á½¸ö¿ÉÒÔÓÃÓÚ´´½¨XMLHTTPRequest¶ÔÏóµÄ¿Ø¼þÃû³Æ£¬±£´æÔÚÒ»¸öÊý×éÖÐ
       //ÅÅÔÚÇ°ÃæµÄ°æ±¾½ÏÐÂ
       var activexName = ["MSZML2.XMLHTTP","Microsoft.XMLHTTP"];
       for (var i=0;i<activexName.length;i++)
       {
           try{
               //È¡³öÒ»¸ö¿Ø¼þÃû½øÐд´½¨£¬Èç¹û´´½¨³É¹¦¾ÍÖÕֹѭ»·
               //Èç¹û´´½¨Ê§°Ü£¬ÔòÅ׳öÒì³££¬È»ºó¿ÉÒÔ¼ÌÐøÑ­»·£¬¼ÌÐø³¢ÊÔ´´½¨
               xmlhttp = new ActiveXObject(activexName[i]);
               break;
           } catch(e) {}
       }
      
   }
   if(!xmlhttp)
   {
       alert("XMLHttpRequest¶ÔÏó´´½¨Ê§°Ü!");
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