本文实例讲述了javascript省市级联功能实现方法。分享给大家供大家参考，具体如下：
初步实现方法：
<html>
<head>
<script language="javascript">
function changecity(){
var province = document.form1.selprovince.value;
var newoption1,newoption2;
switch(province){
case "四川省":
newoption1 = new Option("成都市", "chengdu");
newoption2 = new Option("绵阳市", "mianyang");
break;
case "湖北省" :
newoption1= new Option("武汉市","wuhan");
newoption2= new Option("襄樊市","xiangfan");
break;
case "山东省" :
newoption1= new Option("青岛市","qingdao");
newoption2= new Option("烟台市","yantai");
break;
}
document.form1.selcity.options.length=0;
document.form1.selcity.options.add(newoption1);
document.form1.selcity.options.add(newoption2);
}
</script>
</head>
<form name="form1" action="" method="post">
<select name="selprovince" onchange="changecity()">
<option>--请选择开户帐号的省份--</option>
<OPTION value="四川省">四川省</OPTION>
<OPTION value="山东省">山东省</OPTION>
<OPTION value="湖北省">湖北省</OPTION>
</select>
<select name="selcity">
<option>--请选择开户帐号的城市--</option>
</select>
</form>
</html>
改进实现方法：
<html>
<head>
<script language="javascript">
function changecity(){
var cityList = new Array();
cityList[0]=['成都', '绵阳', '德阳', '自贡'];
cityList[1]=['济南', '青岛', '淄博', '枣庄'];
cityList[2]=['武汉', '宜昌', '荆州', '襄樊'];
var pindex = document.form1.selprovince.selectedIndex-1;
var newoption1;
document.form1.selcity.options.length = 0;
for(var j in cityList[pindex]){
newoption1 = new Option(cityList[pindex][j], cityList[pindex][j]);
document.form1.selcity.options.add(newoption1);
}
}
</script>
</head>
<form name="form1" action="" method="post">
<select name="selprovince" onchange="changecity()">
<option>--请选择省份--</option>
<OPTION value="四川省">四川省</OPTION>
<OPTION value="山东省">山东省</OPTION>
<OPTION value="湖北省">湖北省</OPTION>
</select>
<select name="selcity">
<option>--请选择城市--</option>
</select>
</form>
</html>
改进方法2：
<html>
<head>
<script language="javascript">
function citychange(){
var cityList = new Array();
cityList['辽宁省'] = ['沈阳','鞍山','大连'];
cityList['山东省'] = ['济南','烟台','蓬莱'];
cityList['山西省'] = ['太原','大同','平遥'];
var pindex = document.form1.selprovince.value;
var newoption1;
document.form1.selcity.options.length = 0;
for(var i in cityList[pindex]){
newoption1 = new Option(cityList[pindex][i],cityList[pindex][i]);
document.form1.selcity.options.add(newoption1);
}
}
</script>
</head>
<form action="" name="form1" method="post">
<select name="selprovince" onchange="citychange()">
<option>请选择省份</option>
<OPTION value="辽宁省">辽宁省</OPTION>
<OPTION value="山东省">山东省</OPTION>
<OPTION value="山西省">山西省</OPTION>
</select>
<select name="selcity">
<option>请选择城市</option>
</select>
</form>
</html>
希望本文所述对大家JavaScript程序设计有所帮助。