<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>每天一个JavaScript实例-动态省份选择城市</title>
<script>
var citystore = new Array();
citystore = [['SD','济南'],['SD','烟台'],['SD','青岛'],['SX','太原'],['BJ','北京'],['HN','海南']];
window.onload = function(){
document.getElementById("state").onchange=changecity;
}
function changecity(){
var state = this.value;
var city = document.getElementById('cities');
city.options.length = 0;
for(var i = 0; i <citystore.length;i++){
if(state == citystore[i][0]){
var opt =new Option(citystore[i][1]);
try{
city.add(opt,null);
}catch(e){
city.add(opt);
}
}
}
}
</script>
</head>
<body>
<form id="picker" method="post" action="">
<select id = "state">
<option value="">--</option>
<option value="SD">山东</option>
<option value="SX">山西</option>
<option value="BJ">北京</option>
<option value="HN">海南</option>
</select>
<select id="cities">
</select>
</form>
</body>
</html>