Ajax浏览器版本问题收藏

function Anthem_GetXMLHttpRequest()
{
if (window.XMLHttpRequest)
{
return new XMLHttpRequest();
}
else
{
if (window.Anthem_XMLHttpRequestProgID)
{
return new ActiveXObject(window.Anthem_XMLHttpRequestProgID);
}
else
{
var progIDs = ["Msxml2.XMLHTTP.5.0", "Msxml2.XMLHTTP.4.0", "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP", "Microsoft.XMLHTTP"];
for (var i = 0; i < progIDs.length; ++i)
{
var progID = progIDs[i];
try
{
var x = new ActiveXObject(progID);
window.Anthem_XMLHttpRequestProgID = progID;
return x;
}
catch (e)
{
}
}
}
}
return null;
}