<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> </head> <body> <form name="form1" method="post" action="login.php"> 国家：<select name="country" id="country"> <option value="0">请选择国家</option> <option value="1">中国</option> <option value="2">美国</option> <option value="3">法国</option> <option value="4">意大利</option> </select> 省份：<select name="province" id="province"> <option value="0">请选择省/城市</option> </select> 城市：<select name="city" id="city"> <option value="0">请选择城市/地区</option> </select> </form> </body> <script type="text/javascript"> 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"]; var arr_city = [ ["请选择城市/地区"], ["东城区", "西城区", "朝阳区", "宣武区", "昌平区", "大兴区", "丰台区", "海淀区"], ['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'], ['和平区', '河西区', '南开区', '河北区', '河东区', '红桥区', '塘古区', '开发区'], ['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'], ['福田区', '罗湖区', '盐田区', '宝安区', '龙岗区', '南山区', '深圳周边'], ['广州市', '惠州市', '汕头市', '珠海市', '佛山市', '中山市', '东莞市'] ]; var country = document.getElementById('country'); var province = document.getElementById('province'); var city = document.getElementById('city'); // 添加国家监听事件 country.addEventListener('change',function() { let html = ''; if(this.value == 1){ arr_province.forEach((ele,index) => { html += ` <option value="${index}">${ele}</option> ` }) }else{ html = '<option value="0">请选择省/城市</option>' } province.innerHTML = html; }) // 添加城市监听事件 province.addEventListener('change',function(){ let html = ""; arr_city[this.value].forEach((ele,index) => { html += ` <option value="${index}">${ele}</option> ` }) city.innerHTML = html; }) </script> </html>