How to create Ajax objects and compatible with multiple browsers _ajax related

This article mainly describes how to create Ajax objects and compatible with multiple browsers, you need friends can refer to the

<script> 
function Createajax () { 
var request=false; 
There is a XMLHttpRequest in the Window object that is not IE, including (IE7 version) 
if (window. XMLHttpRequest) { 
request=new XMLHttpRequest (); 
if (request.overridemimetype) { 
request.overridemimetype ("Text/xml"); 
} 
There is an ActiveXObject property in the Window object that is IE 
}else if (window). ActiveXObject) { 
var versions=[' microsoft.xmlhttp ', ' MSXML. XMLHTTP ', ' msxml2.xmlhttp.7.0 ', ' msxml2.xmlhttp.6.0 ', ' msxml2.xmlhttp.5.0 ', ' msxml2.xmlhttp.4.0 ', ' MSXML2. xmlhttp.3.0 ', ' MSXML2. XMLHTTP ']; 
for (var i=0 i<versions.length; i++) { 
try{ 
request=new ActiveXObject (Versions[i]); 
if (request) {return 
request 
} 
} catch (e) { 
request=false 
}}} return request; 
} 
var ajax=createajax (); 
Alert (AJAX); 
</script>