<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<form name="form1">
<select name="country" onChange="getCity()" >
<option value="0">请选择所在的国家</option>
<option value="1">中国</option>
<option value="2">美国</option>
<option value="3">英国</option>
<option value="4">意大利</option>
</select>
<select name="city">
<option value="0">请选择所在的城市 </option>
</select>
</form>
</body>
<script type="text/javascript">
//定义一个二维数组
var city=[
["北京","上海","广州","深圳"],
["华盛顿","纽约","旧金山","西雅图"],
["剑桥","伦敦","苏格兰地区","北爱尔兰地区"],
["罗马","米兰","威尼斯","都灵"]
];
function getCity(){
var sltCountry=document.form1.country; //获得国家下拉框的对象
var sltCity=document.form1.city; //获得城市下拉框的对象
var country=city[sltCountry.selectedIndex-1]; //得到对应国家的城市数组
sltCity.length=1; //清空城市下拉框，仅留提示选项。
//通过for循环，将城市中的值填充到城市下拉框中
for(var i=0;i<country.length;i++){
sltCity[i+1]=new Option(country[i],country[i]);
}
}
</script>
</html>
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