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找到天都黑了,總算找到了一點(diǎn)點(diǎn)東西:

http_request = false;

if (window.XMLHttpRequest)
{ // Mozilla, Safari,...
    http_request = new XMLHttpRequest();
     if (http_request.overrideMimeType)
  {
            http_request.overrideMimeType(‘text/xml‘);
      }
 }
 else if (window.ActiveXObject)
 { // IE
      try
   {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
       }
    catch (e)
    {
            try
   {
                  http_request = new ActiveXObject("Microsoft.XMLHTTP");
            }
      catch (e){}
       }
 }

 if (!http_request)
     alert(‘Giving up :( Cannot create an XMLHTTP instance‘);
 else
  alert(‘you have get the xmlhttp object !);

這樣得到了xmlhttp對象后,對其的進(jìn)步操作可以參考偶以前撿的"