// LoadXML()見上一篇IE下讀取XML
var xmlDom = loadXML("config.xml");
var contentText = "";
if(typeof xmlDom.xml != 'undefined') {
contentText = xmlDom.xml;
var fso = new ActiveXObject("Scripting.FileSystemObject");
var file = fso.CreateTextFile("D://test//test.xml", true);
file.Write(contentText);
file.Close();

<iframe name="export" src="about:blank" style="display:none;"></iframe>

var frame = window.frames["export"];
frame.document.open();
frame.document.write(contentText);
frame.document.execCommand("saveAs",true,"test.xml");
frame.document.close();