ie和firefox下javascript创建xml对象

<mce:script language="javascript"><!-- function createXmlObject() { var xmldoc = false ; //判断是否为firefox或ie var moz = (typeof document.implementation != 'undefined') && (typeof document.implementation.createDocument != 'undefined') ; var ie = (typeof window.ActiveXObject != 'undefined') ; if (moz) // 创建firefox下xml文档对象 { xmldoc = document.implementation.createDocument("", "doc", null); } else if (ie) //创建ie下xml文档对象 { xmldoc = new ActiveXObject("Microsoft.XMLDOM"); //xmldoc.async = false; //while(xmldoc.readystate != 4) {}; } return xmldoc; } // 创建XML对象 var xmldoc = new createXmlObject() ; //alert("xml: "+xmldoc) ; // --></mce:script>