js 实现 省市级联


<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<script type="text/javascript">
var shengArr =new Array();
shengArr["广东"]=["广州","深圳","珠海","汕头","韶关"] ;
shengArr["湖南"]=["长沙","张家界","株洲","怀化","常德"] ;
shengArr["湖北"]=["武汉","荆州","宜昌","黄冈","仙桃"] ;
shengArr["安徽"]=["合肥","黄山"] ;
shengArr["河南"]=["郑州","信阳","洛阳"] ;

function getSheng(){
var s =document.getElementById("sheng");

for(var v in shengArr){
s.add(new Option(v,v),null);
}
}
function getCity(){
var s =document.getElementById("sheng");
var c =document.getElementById("city");
var v=s.value;
c.options.length =0;

for(var i in shengArr[v]){
c.add(new Option(shengArr[v][i],shengArr[v][i]),null);
}
}
</script>

<!--页面加载时获取 省名-->
<body onload="getSheng()">

<!-- 改变省时匹配该省的城市名-->
省:<select id="sheng" onchange="getCity()">
<option>--请选择</option>
</select>
市:<select id="city"></select>
</body>
</html>
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