这是一款JS三级地区省市县选择插件，非常好用的一个小插件，本人已亲测，有demo，一看就懂哦。

使用方法

在页面引入以下Region.js文件

<script type="text/javascript" src="Region.js"></script>

<script>
function abc(){alert(this.selectedIndex);}
var a = AreaSelector({isLoadOnInit:false,
            selProvinceId:'selProvince',
            selCityId:'selCity',
            selAreaId:'selArea'});
  
var b = AreaSelector({
            selProvinceId:'selProvince2',
            selCityId:'selCity2',
            selAreaId:'selArea2',
            onProvinceChange:function(){alert(this.options[this.selectedIndex].value);},
            onCityChange:abc,
            onAreaChange:abc});
            b.initProvince(4,3,22);
//b.initProvince()                           
</script>

HTML结构

<span>*</span> 省
<select id="selProvince" style="width:80px" name="selProvince">
</select>
<span>*</span> 市
<select id="selCity" name="selCity">
</select>
<span>*</span> 县/区
<select id="selArea" name="selArea">
</select>
&nbsp;
<input type=button onClick="AreaSelector({selProvinceId:'selProvince',
            selCityId:'selCity',
            selAreaId:'selArea'}).initProvince(4,3,22)" value="Load">
&nbsp;
<input type=button onClick="a.initProvince(4,3,22)" value="Load2">
<br/>
<br/>
<br/>
默认加载省份：<br/>
<span>*</span> 省
<select id="selProvince2" style="width:80px" name="selProvince2">
</select>
<span>*</span> 市
<select id="selCity2" name="selCity2">
</select>
<span>*</span> 县/区
<select id="selArea2" name="selArea2">
</select>