每天一个JavaScript实例-动态省份选择城市

时间：2023-03-08 19:46:47
<!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>