[b]一 读xml文件到字符串[/b] 第一步：将xml文件，转化为DOM结构 1 var xmlDoc = document.implementation.createDocument("", "test", null); xmlDoc.load("d:\\develop\\bookmarks.xml"); 2 var req = new XMLHttpRequest(); req.open("GET", "chrome://passwdmaker/content/people.xml", false); req.send(null); var dom = req.responseXML; dom就是DOM结构对象 第二步：将DOM结构转化为xml字符串 var serializer = Components.classes["@mozilla.org/xmlextras/xmlserializer;1"].createInstance(Components.interfaces.nsIDOMSerializer); var str = serializer.serializeToString(dom); str就是xml内容的字符串 [b]二 将xml字符串写成xml文件 [/b]// str为xml字符串 var parser = new DOMParser(); var dom = parser.parseFromString(str, "text/xml"); var serializer = Components.classes["@mozilla.org/xmlextras/xmlserializer;1"].createInstance(Components.interfaces.nsIDOMSerializer); var foStream = Components.classes["@mozilla.org/network/file-output-stream;1"].createInstance(Components.interfaces.nsIFileOutputStream); var file = Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile); file.initWithPath("d:\\develop\\myxmlfile.xml");// 保持的位置 foStream.init(file, 0x02 | 0x08 | 0x20, 0664, 0); // write, create, truncate serializer.serializeToStream(dom.documentElement, foStream, ""); // rememeber, dom is the DOM tree foStream.close(); 附件： 1 创建DOM结构 // 生成document对象 var xmldoc = document.implementation.createDocument("","",null); // 创建xml文件的头 // <?xml version="1.0" encoding="UTF-8" standalone="yes"?> var head = xmldoc.createProcessingInstruction("xml","version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\""); xmldoc.appendChild(head); // 创建ROOT节点 var nodest = xmldoc.createElement("nodeset"); xmldoc.appendChild(nodest); // 创建子节点 var elem1 = doc.createElement("name"); elem1.textContent = "张三"; nodest.appendChild(elem1); var elem2 = doc.createElement("name"); elem2.textContent = "李四"; nodest.appendChild(elem2); // 创建的结果如下 <?xml version="1.0" encoding="UTF-8" standalone="yes"?><nodeset><name>张三</name><name>李四</name></nodeset> 这样生成的xmlDOM结构通过系列化转化为xml字符串时不会自动缩进，但通过XML对象解析下就可以了。 var serializer = Components.classes["@mozilla.org/xmlextras/xmlserializer;1"].createInstance(Components.interfaces.nsIDOMSerializer); // 解析DOMxml结构到xml字符串 // 要XML对象解析成功必须将xml头去掉 // 去掉xml头 var xmlDeclaration = /^<\?xml version[^>]+?>/; var str = new XML( serializer.serializeToString(xmldoc).replace(xmlDeclaration, '') ).toXMLString(); 哈哈，现在的str就是能够自动缩进的xml字符串了。不过要是你的xml要编码成功还得在str前面加上xml头，千万别忘了啊。