new ActiveXObject("Msxml2.DOMDocument");

Question

   var xmlDoc =  new ActiveXObject("Msxml2.DOMDocument");IE 支持   firefox 不支持 ，为什么啊  ？ 有什么解决的办法没？

Answer 1

支持ie，ff，chrome,opera,safari:/*
 *读取xml
 */
 var readXML=function(xmlFile) {
    var xmlDoc;
    if(window.ActiveXObject){
        xmlDoc = new ActiveXObject('Microsoft.XMLDOM');
        xmlDoc.async = false;
        xmlDoc.load(xmlFile);
        //return xmlDoc.documentElement.xml;
    } else if (document.implementation&&document.implementation.createDocument){
        var xmlhttp = new XMLHttpRequest();
        xmlhttp.open("GET",xmlFile,false);
        xmlhttp.send(null);
        xmlDoc = xmlhttp.responseXML;
        //return new XMLSerializer().serializeToString(xmlDoc);
    } else {
        return null;
    }
    return xmlDoc;
}

Answer 2

 ActiveXObject本来就是IE的专利啊！！！