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AJAX µÄÒªµãÊÇ XMLHttpRequest ¶ÔÏó¡£²»Í¬µÄä¯ÀÀÆ÷´´½¨ XMLHttpRequest ¶ÔÏóµÄ·½·¨ÊÇÓвîÒìµÄ¡£IE ä¯ÀÀÆ÷ʹÓà ActiveXObject£¬¶øÆäËûµÄä¯ÀÀÆ÷ʹÓÃÃûΪ XMLHttpRequest µÄ JavaScript ÄÚ½¨¶ÔÏó¡£ÈçÐèÕë¶Ô²»Í¬µÄä¯ÀÀÆ÷À´´´½¨´Ë¶ÔÏó£¬ÎÒÃÇҪʹÓÃÒ»Ìõ "try and catch" Óï¾ä¡£
<script type="text/javascript">
function ajaxFunction()
 {
 var xmlHttp;
 try{
xmlHttp=new XMLHttpRequest();// Firefox, Opera 8.0+, Safari
}
 catch (e) {
   try{
      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");// Internet Explorer 6.0+
      }
   catch (e) {
      try{
         xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");// Internet Explorer 5.5
         }
      catch (e) {
         alert("ÄúµÄä¯ÀÀÆ÷²»Ö§³ÖAJAX£¡");
         return false;}
      }}
 }
</script>
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AJAX - XMLHttpRequest¶ÔÏó
onreadystatechange ÊôÐÔ
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xmlHttp.onreadystatechange=function()
  {
  // ÎÒÃÇÐèÒªÔÚÕâÀïдһЩ´úÂë
  }
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