用javascript制作的一个简单三级联动，非常简单实用
省：
市：
区：
<script><br />
//声明省<br />
var pres = ["北京", "上海", "山东"]; //直接声明Array<br />
//声明市<br />
var cities = [<br />
["东城", "昌平", "海淀"],<br />
["浦东", "高区"],<br />
["济南", "青岛"]<br />
];<br />
var areas = [<br />
[<br />
["东城1", "东城2", "东城3"],<br />
["昌平1", "昌平2", "昌平3"],<br />
["海淀1", "海淀2", "海淀3"]<br />
],<br />
[<br />
["浦东1", "浦东2", "浦东3"],<br />
["高区1", "高区2", "高区3"]<br />
],<br />
[<br />
["济南1", "济南2"],<br />
["青岛1", "青岛2"]<br />
]<br />
]<br />
//设置一个省的公共下标<br />
var pIndex = -1;<br />
var preEle = document.getElementById("pre");<br />
var cityEle = document.getElementById("city");<br />
var areaEle = document.getElementById("area");<br />
//先设置省的值<br />
for (var i = 0; i < pres.length; i++) {<br />
//声明option.<option value="pres[i]">Pres[i]<br />
var op = new Option(pres[i], i);<br />
//添加<br />
preEle.options.add(op);<br />
}<br />
function chg(obj) {<br />
if (obj.value == -1) {<br />
cityEle.options.length = 0;<br />
areaEle.options.length = 0;<br />
}<br />
//获取值<br />
var val = obj.value;<br />
pIndex = obj.value;<br />
//获取ctiry<br />
var cs = cities[val];<br />
//获取默认区<br />
var as = areas[val][0];<br />
//先清空市<br />
cityEle.options.length = 0;<br />
areaEle.options.length = 0;<br />
for (var i = 0; i < cs.length; i++) {<br />
var op = new Option(cs[i], i);<br />
cityEle.options.add(op);<br />
}<br />
for (var i = 0; i < as.length; i++) {<br />
var op = new Option(as[i], i);<br />
areaEle.options.add(op);<br />
}<br />
}<br />
function chg2(obj) {<br />
var val = obj.selectedIndex;<br />
var as = areas[pIndex][val];<br />
areaEle.options.length = 0;<br />
for (var i = 0; i < as.length; i++) {<br />
var op = new Option(as[i], i);<br />
areaEle.options.add(op);<br />
}<br />
}<br />
</script>
以上所述就是本文的全部内容了，希望大家能够喜欢。
