刚始学习java刚好看到用js实现省市二级联动的效果，就想着写篇博客，顺便检验下自己的学习成果。
好了废话少说先看看实际效果：
技术分析：
要实现这个功能呢，首先要用到html+js
这里用建一个下拉列表，绑定onchange事件
<select onchange="changeCity(this.value)"> <option>--请选择--</option> <option value="0">湖北</option> <option value="1">湖南</option> <option value="2">河北</option> <option value="3">河南</option> </select> <select> </select>
好了下面是script部分了
<script> //1.创建一个二维数组用于存储省份和城市 var cities = new Array(3); cities[0] = new Array("武汉市","黄冈市","襄阳市","荆州市"); cities[1] = new Array("长沙市","郴州市","株洲市","岳阳市"); cities[2] = new Array("石家庄市","邯郸市","廊坊市","保定市"); cities[3] = new Array("郑州市","洛阳市","开封市","安阳市"); function changeCity(val){ //7.获取第二个下拉列表 var c=document.getElementById("city"); //9.清空第二个下拉列表的option内容 c.options.length=0; //2.遍历二维数组中的省份 for(var i=0;i<cities.length;i++){ //注意，比较的是角标 if(val==i){ //3.遍历用户选择的省份下的城市 for(var j=0;j<cities[i].length;j++){ //alert(cities[i][j]); //4.创建城市的文本节点 var a = document.createTextNode(cities[i][j]); //5.创建option元素节点 var b = document.createElement("option"); //6.将城市的文本节点添加到option元素节点 b.appendChild(a); //8.将option元素节点添加到第二个下拉列表中去 c.appendChild(b); } } } } </script>
这样这个简单的省市二级联动就完成了，是不是特别简单呢？本人因为偷懒所以只写了四个省市，如果想完善点可以自己添加省市哦。
小编再为大家分享一位网友分享的一段代码：原生js实现省市二级联动，再此谢谢作者的分享。
通过document.createElement()创建option选项，再遍历数组appendChild到select对象内，三级联动就是用三位数组和嵌套遍历来实现。
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>js省市二级联动</title> </head> <body> <form method="get" action="#"> 省份：<select onchange="changeProvince(this.selectedIndex)"></select> 城市：<select></select> </form> </body> </html> <script type="text/javascript"> var provinces=["请选择省份","北京市","天津市","上海市","重庆市","江苏省","浙江省","江西省","海南省"]; var citys=[ ["请选择城市"], ["北京市"], ["天津市"], ["上海市"], ["重庆市"], ["南京市","无锡市","徐州市","常州市","苏州市","南通市","连云港市","淮安市","盐城市","扬州市","镇江市","泰州市","宿迁市"], ["杭州市","宁波市","温州市","绍兴市","湖州市","嘉兴市","金华市","衢州市","台州市","丽水市","舟山"], ["南昌市","九江市","上饶市","抚州市","宜春市","吉安市","赣州市","景德镇","萍乡市","新余市","鹰潭市"], ["海口市","三亚市","三沙市","儋州市"] ]; window.onload=function(){ var province=document.getElementById("province"); var city=document.getElementById("city"); var index=0; //创建好后加入到列表中 for(var i in provinces) { var option = document.createElement("option"); option.text=provinces[i]; option.value=provinces[i]; province.appendChild(option); } var option = document.createElement("option"); option.text=citys[index]; option.value=citys[index]; city.appendChild(option); } function changeProvince(selectedIndex){ var city=document.getElementById("city"); city.options.length=0; for(var i in citys[selectedIndex]) { var option = document.createElement("option"); option.text=citys[selectedIndex][i]; option.value=citys[selectedIndex][i]; city.appendChild(option); } } </script>