跨浏览器创建XMLHttpRequest对象

综合考虑Internet Explorer和非Internet Explorer浏览器这两种情况:

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<script type="text/javascript">function createXMLHttpRequest(){    var xmlHttp;    if(window.XMLHttpRequest){        xmlHttp=new XMLHttpRequest();    }else if(window.ActiveXObject){        try{            xmlHttp=new ActiveXObject("Msmxl2.XMLHTTP");        }catch(e){            xmlHttp=new ActiveXObject("Microosoft.XMLHTTP");        }    }    return xmlHttp;}</script>