【JS】一个安全稳定的Javascript的Ajax对象生成函数

做个记号，兼容IE6~9、火狐、Chrome等主流浏览器

function getAjax() {
    if(window.XMLHttpRequest){
        return new XMLHttpRequest();
    }else if(window.ActiveXObject){
        var xmldes=["MSXML2.XmlHttp","Microsoft.XmlHttp","MSXML2.XmlHttp.5.0","MSXML2.XmlHttp.4.0","MSXML2.XmlHttp.3.0"];
        var xmlobj=false;
        
        for(var i=0;i<xmldes.length;i++){
            try{
                xmlobj=new ActiveXObject(xmldes[i]);
                if(xmlobj) return xmlobj;
            }
            catch(e){}
        }
        
    }
    return false;
}