最近学了一个关于省市级联简单的小例子，贴出来与大家分享一下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>index</title>
</head>
<body>
<select id="selProvince" onchange="changeCity()">
<option>请选择省份</option>
</select>
<select id="selCity">
<option>请选择城市</option>
</select>
<script>
function $(ID){
return document.getElementById(ID);
}
var cityList=new Array();
cityList['北京市']=['东城区','西城区','昌平区'];
cityList['河北省']=['保定','石家庄','定州'];
cityList['江苏省'] = ['南京市','苏州市','无锡市'];
cityList['浙江省'] = ['杭州市','宁波市','温州市'];
cityList['四川省'] = ['四川省','成都市'];
cityList['海南省'] = ['海口市'];
function changeCity(){
var province=$("selProvince").value;
var city=$("selCity");
city.options.length=0;
for (var i in cityList) {
if(i==province){
for (var j in cityList[i]) {
city.add(new Option(cityList[i][j],cityList[i][j]),null);
}
}
}
}
function allCity(){
var province=$("selProvince");
for (var i in cityList) {
province.add(new Option(i,i),null);
}
}
window.onload=allCity;
</script>
</body>
</html>
