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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 =http://www.mamicode.com/ arr_province[i];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         //循环将数组中的数据写入<option>标记中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 =http://www.mamicode.com/ arr_city[index][j];53         }54 55     }56 57     function  changeSelect(index){58         //选择对象59         var city = document.form1.city;60         //修改省份列表的选择项61         province.selectedIndex = index;62 63         //指定城市中<option>标记的个数64         city.length = arr_city[index].length;65 66         //循环将数组中的数据写入<option>标记中67         for (var j = 0; j<arr_city[index].length;j++) {68             city.options[j].text = arr_city[index][j];69             city.options[j].value =http://www.mamicode.com/ arr_city[index][j];70         }71     }72 73 </script>

 

利用JS实现一个简单的二级联动菜单