首先建立一個Area.html，很簡單包含一個省份的select元素和一個城市的界面元素：
<html>
<head>
<title>Area Demo</title>
</head>
<body>
<select id="province" size=1 οnchange="loadCity()">
<option value="city01.xml"> 江蘇 </option>
<option value="city02.xml"> º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();
/**
* 裝載城市資料
*/
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> <?xml version="1.0" encoding="GB2312"?>
<Cities Province="江蘇">
<City name="南京"/>
</Cities> <?xml version="1.0" encoding="GB2312"?>
<Cities Province="湖南">
<City name="長沙"/>
</Cities> <?xml version="1.0" encoding="GB2312"?>
<Cities Province="湖北">
<City name="武漢"/>
</Cities> ![nodejs微信開發---授權登入+擷取使用者資訊微信網頁授權[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)