本文实例讲述了javascript实现省市区三级联动下拉框菜单代码。分享给大家供大家参考。具体如下：
运行效果截图如下：
首先写一个静态的页面：
<!DOCTYPE html>
<html>
<head>
<title>QQ JS省市区三级联动</title>
<!-- 使用QQ的省市区数据 -->
<!--
<script type="text/javascript" src="http://ip.qq.com/js/geo.js"></script>
-->
<script type="text/javascript" src="geo.js"></script>
</head>
<body onload="setup();preselect('北京市');promptinfo();">
<form name="shareip" action="" method="post">
<select class="select" name="province" id="s1">
<option></option>
</select>
<select class="select" name="city" id="s2">
<option></option>
</select>
<select class="select" name="town" id="s3">
<option></option>
</select>
<input id="address" name="address" type="hidden" value="" />
<input onclick="alert(promptinfo())" type="submit" value="提交" />
</form>
<script>
function promptinfo()
{
var address = document.getElementById('address').value;
var s1 = document.getElementById('s1').value;
var s2 = document.getElementById('s2').value;
var s3 = document.getElementById('s3').value;
address=""+s1+ s2 + s3;
return address;
}
</script>
</body>
</html>
调用的geo.js源码：
function Dsy() {
this.Items = {};
}
Dsy.prototype.add = function (id, iArray) {
this.Items[id] = iArray;
}
Dsy.prototype.Exists = function (id) {
if (typeof(this.Items[id]) == "undefined") return false;
return true;
}
function change(v) {
var str = "0";
for (i = 0; i 0 || !v) {
if (dsy.Exists(str)) {
ar = dsy.Items[str];
for (i = 0; i 
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