<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <title> New Document </title> <script language="JavaScript" type="text/javascript"> <!-- //按照省份下拉列表框的顺序定义二维数组，将城市列表对应到省份 var city=[ ["北京","天津","上海","重庆"], //直辖市 ["南京","苏州","南通","常州"], //江苏省 ["福州","福安","龙岩","南平"], //福建省 ["广州","潮阳","潮州","澄海"], //广东省 ["兰州","白银","定西","敦煌"] //甘肃省 ]; function getCity(){ //获得身省份和城市下拉列表框的引用 var sltProvince=document.forms["theForm"].elements["province"]; var sltCity=document.forms["theForm"].elements["city"]; //得到对应于省份的城市列表数组 var provinceCity=city[sltProvince.selectedIndex-1]; //将城市下拉列表框清空，仅留第一个提示选项 sltCity.length=1; //将相应省市的城市填充到城市选择框中 for(var i=0;i<provinceCity.length;i++){ //创建新的Option对象并将其添加到城市下拉列表框中 sltCity[i+1]=new Option(provinceCity[i],provinceCity[i]); } } //--> </script> </head> <body> <form action="somepage.asp" name="theForm"> <select name="province" onchange="getCity()"> <option value="0">请选择所在省份</option> <option value="直辖市">直辖市</option> <option value="江苏省">江苏省</option> <option value="福建省">福建省</option> <option value="广东省">广东省</option> <option value="甘肃省">甘肃省</option> </select> <select name="city"> <option value="0">请选择所在城市</option> </select> </form> </body> </html>