利用JS实现一个简单的二级联动菜单

前几天在看js的相关内容，所以就简单写了一个二级联动菜单。分享一下。
 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>JS实现二级联动菜单</title>
 6 </head>
 7 <body>
 8     <form name="form1" method="post" action="">
 9         省份：<select name="province" id="province" onchange="changeSelect(this.selectedIndex)"></select>
10         地区：<select name="city" id="city"></select>
11 
12     </form>
13 </body>
14 </html>
15 <script type="text/javascript">
16     var arr_province = ["请选择省/城市","北京市","上海市","天津市","重庆市","深圳市","广东省"];
17     var arr_city = [
18                     ["请选择城市/地区"],19                     ["东城区","西城区","朝阳区","宣武区","昌平区","大兴区","丰台区","海淀区"20                     ['宝山区','长宁区','丰贤区','虹口区','黄浦区','青浦区','南汇区','徐汇区','卢湾区'21                     ['和平区','河西区','南开区','河北区','河东区','红桥区','塘古区','开发区'22                     ['俞中区','南岸区','江北区','沙坪坝区','九龙坡区','渝北区','大渡口区','北碚区'23                     ['福田区','罗湖区','盐田区','宝安区','龙岗区','南山区','深圳周边'24                     ['广州市','惠州市','汕头市','珠海市','佛山市','中山市','东莞市']
25                 ];
26     //网页加载完成，初始化菜单
27     window.onload = init;传入函数地址
28     function init(){
29         首先获取对象
30         var province = document.form1.province;
31         var city = document.form1.city;
32 
33         指定省份中<option>标记的个数
34         province.length = arr_province.length;
35 
36         循环将数组中的数据写入<option>标记中
37         for(var i=0;i<arr_province.length;i++){
38             province.options[i].text = arr_province[i];
39             province.options[i].value =40         }
41 
42         修改省份列表的默认选择项
43         var index = 0;
44         province.selectedIndex = index;
45 
46         指定城市中<option>标记的个数
47         city.length = arr_city[index].length;
48 
49         50         for (var j = 0; j<arr_city[index].length;j++) {
51             city.options[j].text = arr_city[index][j];
52             city.options[j].value =53 54 
55     }
56 
57       changeSelect(index){
58         选择对象
59         60         修改省份列表的选择项
61         province.selectedIndex =62 
63         64         city.length =65 
66         67         68             city.options[j].text =69             city.options[j].value =70 71 72 
73 </script>
利用JS实现一个简单的二级联动菜单

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