<script language="JavaScript">
<!--
var doc = new ActiveXObject("Msxml2.DOMDocument"); //ie5.5+,CreateObject("Microsoft.XMLDOM")
//加载文档
//doc.load("b.xml");//创建文件头
var p = doc.createProcessingInstruction("xml","version='1.0' encoding='gb2312'"); //添加文件头
doc.appendChild(p);//用于直接加载时获得根接点
//var root = doc.documentElement;//两种方式创建根接点
// var root = doc.createElement("students");
var root = doc.createNode(1,"students",""); //创建子接点
var n = doc.createNode(1,"ttyp",""); //指定子接点文本
//n.text = " this is a test";
//创建孙接点
var o = doc.createElement("sex");
o.text = "男"; //指定其文本 //创建属性
var r = doc.createAttribute("id");
r.value="test"; //添加属性
n.setAttributeNode(r); //创建第二个属性
var r1 = doc.createAttribute("class");
r1.value="tt";
//添加属性
n.setAttributeNode(r1); //删除第二个属性
n.removeAttribute("class"); //添加孙接点
n.appendChild(o); //添加文本接点
n.appendChild(doc.createTextNode("this is a text node.")); //添加注释
n.appendChild(doc.createComment("this is a comment\n"));
//添加子接点
root.appendChild(n);
//复制接点
var m = n.cloneNode(true); root.appendChild(m);
//删除接点
root.removeChild(root.childNodes(0)); //创建数据段
var c = doc.createCDATASection("this is a cdata");
c.text = "hi,cdata";
//添加数据段
root.appendChild(c);
//添加根接点
doc.appendChild(root); //查找接点
var a = doc.getElementsByTagName("ttyp");
//var a = doc.selectNodes("//ttyp"); //显示改接点的属性
for(var i= 0;i<a.length;i++)
{
alert(a[i].xml);
for(var j=0;j<a[i].attributes.length;j++)
{
alert(a[i].attributes[j].name);
}
} //XML保存（需要在服务端，客户端用FSO）
//doc.save();
//查看根接点XML
if(n)
{
alert(n.ownerDocument.xml);
}//-->
</script>
<!--
var doc = new ActiveXObject("Msxml2.DOMDocument"); //ie5.5+,CreateObject("Microsoft.XMLDOM")
//加载文档
//doc.load("b.xml");//创建文件头
var p = doc.createProcessingInstruction("xml","version='1.0' encoding='gb2312'"); //添加文件头
doc.appendChild(p);//用于直接加载时获得根接点
//var root = doc.documentElement;//两种方式创建根接点
// var root = doc.createElement("students");
var root = doc.createNode(1,"students",""); //创建子接点
var n = doc.createNode(1,"ttyp",""); //指定子接点文本
//n.text = " this is a test";
//创建孙接点
var o = doc.createElement("sex");
o.text = "男"; //指定其文本 //创建属性
var r = doc.createAttribute("id");
r.value="test"; //添加属性
n.setAttributeNode(r); //创建第二个属性
var r1 = doc.createAttribute("class");
r1.value="tt";
//添加属性
n.setAttributeNode(r1); //删除第二个属性
n.removeAttribute("class"); //添加孙接点
n.appendChild(o); //添加文本接点
n.appendChild(doc.createTextNode("this is a text node.")); //添加注释
n.appendChild(doc.createComment("this is a comment\n"));
//添加子接点
root.appendChild(n);
//复制接点
var m = n.cloneNode(true); root.appendChild(m);
//删除接点
root.removeChild(root.childNodes(0)); //创建数据段
var c = doc.createCDATASection("this is a cdata");
c.text = "hi,cdata";
//添加数据段
root.appendChild(c);
//添加根接点
doc.appendChild(root); //查找接点
var a = doc.getElementsByTagName("ttyp");
//var a = doc.selectNodes("//ttyp"); //显示改接点的属性
for(var i= 0;i<a.length;i++)
{
alert(a[i].xml);
for(var j=0;j<a[i].attributes.length;j++)
{
alert(a[i].attributes[j].name);
}
} //XML保存（需要在服务端，客户端用FSO）
//doc.save();
//查看根接点XML
if(n)
{
alert(n.ownerDocument.xml);
}//-->
</script>
这儿有个例子。兼容IE和FF。有源码可以下载，希望能帮得上忙。
************************************************<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>无标题文档</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<script language="javascript1.2">
function ChooseState()
{
var source;
var sourceName = "Citys.xml";
var source = new ActiveXObject('Microsoft.XMLDOM'); //创建一个MSXML解析器实例
source.async = false;
source.load(sourceName); //装入XML文档
root = source.documentElement; //设置文档元素为根节点元素
sortField=root.selectNodes("//@name"); //搜索属性中含有name的所有节点
for(var i=0;i<sortField.length;++i) //增加省份名称到下拉列表
{
var oOption = document.createElement('OPTION');
oOption.text = " "+sortField[i].text+" ";
oOption.value = sortField[i].text;
form1.SelState.options.add(oOption);
}
ChooseCity();
} //自定义函数：ChooseCity
//(根据当前选定的省名来读取XML数据中的对应城市名称，并增加到SelCity的下拉列表中)
function ChooseCity()
{
x=form1.SelState.selectedIndex; //读取省份下拉框的当前选项
y=form1.SelState.options[x].value;
sortField=root.selectNodes("//State[@name='"+y+"']/City"); //搜索name属性值等于参数y的State节点下的所有city节点
for(var i=form1.SelCity.options.length-1;i>=0;--i) //撤消原来的列表项
{
form1.SelCity.options.remove(i)
}
for(var i=0;i<sortField.length;++i) //增加城市名称到下拉列表
{
var oOption = document.createElement('OPTION');
oOption.text = " "+sortField[i].text+" ";
oOption.value = sortField[i].text;
form1.SelCity.options.add(oOption);
}
}
</script>
</head><BODY onLoad="ChooseState()">
<FORM action="" method="post" id="form1" name="form1">
<SELECT name="SelState" id="SelState" onchange="ChooseCity()" >
</SELECT>
<SELECT name="SelCity" id="SelCity" >
</SELECT>
</FORM>
</BODY>
</html>附 Citys.xml
<?xml version="1.0" encoding="gb2312"?>
<China>
<State id="1" name="江西">
<City>九江</City>
<City>南昌</City>
<City>庐山</City>
<City>景德镇</City>
</State>
<State id="2" name="北京">
<City>北京西</City>
<City>居庸关</City>
<City>清华园</City>
<City>周口店</City>
</State>
<State id="3" name="福建">
<City>福州</City>
<City>厦门</City>
<City>漳州</City>
</State>
<State id="4" name="甘肃">
<City>兰州</City>
<City>洛门</City>
<City>嘉峪关</City>
</State>
<State id="5" name="广东">
<City>广州</City>
<City>深圳</City>
<City>东莞</City>
<City>石牌</City>
</State>
<State id="6" name="安徽">
<City>合肥</City>
<City>黄山</City>
<City>九龙岗</City>
<City>马鞍山</City>
</State>
</China>
************************************************