本文實例講述了javascript省市級聯功能實現方法。分享給大家供大家參考，具體如下：
初步實現方法：
<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("綿陽市", "mianyang");
break;
case "湖北省" :
newoption1= new Option("武漢市","wuhan");
newoption2= new Option("襄樊市","xiangfan");
break;
case "山東省" :
newoption1= new Option("青島市","qingdao");
newoption2= new Option("煙台市","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>--請選擇開戶帳號的省份--</option>
<OPTION value="四川省">四川省</OPTION>
<OPTION value="山東省">山東省</OPTION>
<OPTION value="湖北省">湖北省</OPTION>
</select>
<select name="selcity">
<option>--請選擇開戶帳號的城市--</option>
</select>
</form>
</html>
改進實現方法：
<html>
<head>
<script language="javascript">
function changecity(){
var cityList = new Array();
cityList[0]=['成都', '綿陽', '德陽', '自貢'];
cityList[1]=['濟南', '青島', '淄博', '棗莊'];
cityList[2]=['武漢', '宜昌', '荊州', '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>--請選擇省份--</option>
<OPTION value="四川省">四川省</OPTION>
<OPTION value="山東省">山東省</OPTION>
<OPTION value="湖北省">湖北省</OPTION>
</select>
<select name="selcity">
<option>--請選擇城市--</option>
</select>
</form>
</html>
改進方法2：
<html>
<head>
<script language="javascript">
function citychange(){
var cityList = new Array();
cityList['遼寧省'] = ['沈陽','鞍山','大連'];
cityList['山東省'] = ['濟南','煙台','蓬萊'];
cityList['山西省'] = ['太原','大同','平遙'];
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>請選擇省份</option>
<OPTION value="遼寧省">遼寧省</OPTION>
<OPTION value="山東省">山東省</OPTION>
<OPTION value="山西省">山西省</OPTION>
</select>
<select name="selcity">
<option>請選擇城市</option>
</select>
</form>
</html>
希望本文所述對大家JavaScript程序設計有所幫助。