XML4跨浏览器兼容

//跨浏览器返回XMLDOM对象

function getXMLDOM(xmlStr){

    var xmlDom=null;

    if(typeof window.DOMParser !='undefined'){

        xmlDom=(new DOMParser).parseFromString(xmlStr,'text/xml');

        var errors=xmlDom.getElementsByTagName('parsererror');

        if(errors.length>0){

            throw new Error('错误信息：'+errors[0].textContent);

        }

    }else if(typeof window.ActiveXObject){

        var version=[

            'MSXML2.DOMDocument6.0',

            'MSXML2.DOMDocument3.0',

            'MSXML2.DOMDocument',

        ];

        for(var i=0;i<version.length;i++){

            try{

                var xmlDom=new ActiveXObject(version[i]);

            }catch(e){

                //跳过

            }

        }

        xmlDom.loadXML(xmlStr);

        if(xmlDom.parseError!=0){

            throw new Error('错误信息：'+xmlDom.parseError.reason);

        };

        return xmlDom;

    }else{

        throw new Error("您的系统或浏览器不支持XML DOM对象！");

    };

    

    return xmlDom;

}

//序列化XML

function serializerXML(xmlDom){

    var xml='';

    if(typeof window.XMLSerializer!='undefined'){

        xml=(new XMLSerializer()).serializeToString(xmlDom);

    }else if(typeof xmlDom.xml!='undefined'){

        xml=xmlDom.xml;

    }

    return xml;

}

var xmlStr='<root><user>Leee</user></root>';

var xmlDom=getXMLDOM(xmlStr);

// alert(xmlDom.xml); //只有IE支持此序列化

alert(serializerXML(xmlDom));

//PS: 为了跨域所有浏览器兼容，我们放弃了从外部加载XML文件，而使用字符串XML加载和序列化