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每天一个JavaScript实例-动态省份选择城市

<!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=http://www.mamicode.com/"">-->

每天一个JavaScript实例-动态省份选择城市