偷懒只加入了部分数据：
HTML模块：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script src="js/pccs.js" type="text/javascript"></script>
</head>
<body οnlοad="initialize()">
<div>
国家：<select name='ddlCountry' id='ddlCountry' style="width:100px;" οnchange="CountrySelChange()"></select>
<br/><br/>
省：<select name='ddlProvince' id='ddlProvince' style="width:100px;" οnchange="ProvinceSelChange()"></select>
<br /><br />
市：<select name='ddlCity' id='ddlCity' style="width:100px;"></select>
</div>
</body>
</html>
JS模块：
<pre name="code" class="javascript">//获取select元素
var CountryObj = document.getElementById("ddlCountry");
var ProvinceObj = document.getElementById("ddlProvince");
var CityObj = document.getElementById("ddlCity");
var CountryStr = "请选择,Australia,Belgium,Cambodia,Canada,Switzerland,China,France,Germany,Hong Kong,India,Indonesia,Ireland,Israel,Italy,Japan,Korea,Kuwait,Lebanon,Luxembourg,Macao,Malaysia,Netherlands,New Zealand,Philippines,Sweden,Singapore,South Africa,Sweden,Taiwan,Thailand,United Kiongdom,USA,Vietnam";
//初始化地区下拉菜单
function initialize()
{
var CountryArray = CountryStr.split(',');
for(var j=0; j<CountryArray.length; j++)
{
CountryObj.add(new Option(CountryArray[j],CountryArray[j]));
}
ProvinceDel();
}
//下拉列表改变事件
function CountrySelChange()
{
ProvinceDel();
ProvinceAdd();
}
//下拉列表改变事件
function ProvinceSelChange()
{
CityDel();
CityAdd();
}
//清空
function ProvinceDel()
{
ProvinceObj.length = 0;
ProvinceObj.add(new Option('请选择', '请选择'));
CityDel();
}
//清空
function CityDel()
{
CityObj.length = 0;
CityObj.add(new Option('请选择', '请选择'));
}
//添加省
function ProvinceAdd()
{
var provinceList = [];
provinceList[0]=(["China","北京市,天津市,上海市,重庆市,河北省,河南省,云南省,辽宁省,黑龙江省,湖南省,安徽省,山东省,新疆维吾尔,江苏省,浙江省,江西省,湖北省,广西壮族,甘肃省,山西省,内蒙古,陕西省,吉林省,福建省,贵州省,广东省,青海省,西藏,四川省,宁夏回族,海南省,台湾省,香港,澳门"]);
provinceList[1]=(["",""]);
provinceList.sort();
for(var i=0; i<provinceList.length; i++)
{
if(CountryObj.value == provinceList[i][0])
{
var province = provinceList[i][1];
AddOne(province, ProvinceObj);
}
}
}
//添加市
function CityAdd()
{
var PCList = [];
PCList[0]=(["北京市","东城区,西城区,朝阳区,丰台区,石景山区,海淀区,门头沟区,房山区,通州区,顺义区,昌平区,大兴区,怀柔区,平谷区,密云县,延庆县"]);
PCList[1]=(["天津市","和平区,河东区,河西区,南开区,河北区,红桥区,东丽区,西青区,津南区,北辰区,武清区,宝坻区,滨海新区,宁河县,静海县,蓟县"]);
PCList[2]=(["上海市","黄浦区,徐汇区,长宁区,静安区,普陀区,闸北区,虹口区,杨浦区,闵行区,宝山区,嘉定区,浦东新区,金山区,松江区,青浦区,奉贤区,崇明县"]);
PCList[3]=(["河北省",""]);
PCList[4]=(["河南省",""]);
PCList[5]=(["云南省",""]);
PCList[6]=(["辽宁省",""]);
PCList[7]=(["黑龙江省",""]);
PCList[8]=(["",""]);
PCList.sort();
for(var i=0; i<PCList.length; i++)
{
if(ProvinceObj.value == PCList[i][0])
{
var City = PCList[i][1];
AddOne(City, CityObj)
}
}
}
//添加实现
function AddOne(Str, Obj)
{
if(Str == "")
return;
var strArray = Str.split(',');
for(var j=0; j<strArray.length; j++)
{
Obj.add(new Option(strArray[j], strArray[j]))
}
}
推荐在线测试：
http://runjs.cn/code
