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 xmlHttp= false;
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  xmlHttp= new XMLHttpRequest();
   if (xmlHttp.overrideMimeType)
   {
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   }
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 else if (window.ActiveXObject)
 {         //IEä¯ÀÀÆ÷
   try
   {   //Microsoft ä¯ÀÀÆ÷ Internet Explorer ʹÓà MSXML ½âÎöÆ÷´¦Àí XML
    xmlHttp= new ActiveXObject("Msxml2.XMLHTTP"); //³¢ÊÔʹÓÃÒ»¸ö°æ±¾µÄ MSXML ´´½¨¶ÔÏó£¬Èç¹ûʧ°ÜÔòʹÓÃÁíÒ»¸ö°æ±¾´´½¨¸Ã¶ÔÏó¡£
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      try
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      xmlHttp= new ActiveXObject("Microsoft.XMLHTTP");
         }
      catch (e)
      {
      }
   }
 }
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  //readyState ״̬½âÊÍ 0 δ³õʼ»¯¶ÔÏóÒÑ´´½¨£¬ÉÐδµ÷ÓÃopen(), 1 Òѳõʼ»¯µ÷ÓÃopen()·½·¨ÒÔºó ,2 ·¢ËÍÊý¾Ýµ÷ÓÃsend()·½·¨ÒÔºó
  //3 Êý¾Ý´«ËÍÖÐÔÚÒѾ­½Óµ½²¿·ÖÊý¾Ý£¬µ«ÉÐδ½ÓÊÕÍê³É ,4 Íê³ÉÊý¾ÝÈ«²¿½ÓÊÕ  
  xmlHttp.onreadystatechange=function() {
   //alert(xmlHttp.readyState);
   if (xmlHttp.readyState==4) {
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