好久没写啦，懒啊。今天写点吧，希望对需要的人有帮助
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
<script type="text/javascript">
var oSelProvince;
var oSelCity;
function LD()
{
var xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
xmlDoc.loadXML("<?xml version='1.0' encoding='utf-8' ?><China><province Name='湖南'><city>长沙</city><city>湘潭</city><city>浏阳</city></province><province Name='广东'><city>广州</city><city>深圳</city></province></China>");
//xmlDoc.load(@"XML/info.xml");
xmlDoc.async = false;
var root = xmlDoc.documentElement;
oSelProvince = document.getElementById('selProvince');
var oEmptyOption = document.createElement('option');
oSelProvince.options.add(oEmptyOption);
oEmptyOption.innerText = '';
for(i=0;i<root.childNodes.length;i++)
{
var province = xmlDoc.getElementsByTagName('province')[i].getAttribute('Name');
var oOption = document.createElement('option');
oSelProvince.options.add(oOption);
oOption.innerText = province;
}
oSelProvince.onchange = function()
{
var province = oSelProvince.options[oSelProvince.selectedIndex].text;
var node = xmlDoc.selectSingleNode("China/province[@Name='"+province+"']");
var oSelCity = document.getElementById('selCity');
oSelCity.length = 0;
for(i=0; i<node.childNodes.length; i++)
{
var oOption = document.createElement('option');
oSelCity.options.add(oOption);
oOption.innerText = node.childNodes[i].text;
}
}
}
</script>
</head>
<body onload="LD()">
<form id="form1" runat="server">
<div>
<select id="selProvince"></select>
<select id="selCity"></select>
</div>
</form>
</body>
</html>