首先建立一个Area.html，很简单包含一个省份的select元素和一个城市的界面元素：
<html>
<head>
<title>Area Demo</title>
</head>
<body>
<select id="province" size=1 onchange="loadCity()">
<option value="city01.xml"> 江苏 </option>
<option value="city02.xml"> 湖南 </option>
<option value="city03.xml"> 湖北 </option>
</select>
<select id="city" size=1>
</select>
<xml id="xmlobj"></xml>
<script language="javascript" type="text/javascript">
var provobj = document.all("province");
var cityobj = document.all("city");
var xmlhttp = document.all("xmlobj");
loadCity();
/**
* 装载城市数据
*/
function loadCity() {
cityobj.options.length = 0;
var file = provobj.options[provobj.selectedIndex].value;
xmlhttp.async = false;
xmlhttp.load(file);
var cities = xmlhttp.selectNodes("Cities/City");
var idx,name;
for(idx = 0; idx < cities.length; idx ++) {
name = cities[idx].getAttribute("name");
cityobj.options.length++;
cityobj.options[cityobj.options.length - 1].value = name;
cityobj.options[cityobj.options.length - 1].text = name;
}
}
</script>
</body>
</html>
然后建立三个省份的城市数据文件，分别命名为city01.xml,city02.xml,city03.xml
<?xml version="1.0" encoding="GB2312"?>
<!-- edited with XMLSPY v2004 rel. 4 U (http://www.xmlspy.com) by Dicky (Apple'S Eden) -->
<Cities Province="江苏">
<City name="南京"/>
<City name="盐城"/>
<City name="扬州"/>
<City name="连云港"/>
<City name="淮阴"/>
<City name="南通"/>
</Cities>
<?xml version="1.0" encoding="GB2312"?>
<!-- edited with XMLSPY v2004 rel. 4 U (http://www.xmlspy.com) by Dicky (Apple'S Eden) -->
<Cities Province="江苏">
<City name="南京"/>
<City name="盐城"/>
<City name="扬州"/>
<City name="连云港"/>
<City name="淮阴"/>
<City name="南通"/>
</Cities>
<?xml version="1.0" encoding="GB2312"?>
<!-- edited with XMLSPY v2004 rel. 4 U (http://www.xmlspy.com) by Dicky (Apple'S Eden) -->
<Cities Province="湖北">
<City name="武汉"/>
<City name="荆州"/>
</Cities>
保存，在ie6浏览通过，理论上可以在ie5一上浏览器跑。 
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