jsp+js省市区三级联动

<select id="province"> <option value="-1">请选择</option> </select>> <select id="city"></select>> <select id="town"></select>> <script> var provinceArr = [ ‘江苏‘, ‘浙江‘ ]; var cityArr=[[‘南京市‘,‘苏州市‘,‘常州市‘,‘无锡市‘,‘镇江市‘],[‘杭州市‘,‘宁波市‘,‘温州市‘,‘绍兴市‘]]; var townArr=[[[‘玄武区‘,‘秦淮区‘,‘鼓楼区‘,‘建邺区‘,‘雨花台区‘,‘栖霞区‘,‘浦口区‘,‘六合区‘,‘江宁区‘,‘溧水区‘],[‘吴中区‘,‘虎丘区‘,‘工业园区‘],[‘金坛市‘,‘钟楼区‘,‘天宁区‘],[‘梁溪区‘,‘滨湖区‘,‘惠山区‘,‘锡山区‘,‘江阴市‘],[‘京口区‘,‘润州区‘,‘丹徒区‘]], [[‘上城区‘,‘下城区‘,‘余杭区‘,‘拱墅区‘,‘西湖区‘,‘江干区‘],[‘江东区‘,‘海曙区‘,‘鄞州区‘,‘江北区‘,‘镇海区‘,‘北仑区‘],[‘鹿城区‘,‘龙湾区‘,‘瓯海区‘,‘永嘉县‘],[‘越城区‘,‘柯桥区‘,‘上虞区‘,‘诸暨市‘,‘嵊州市‘,‘新昌县‘]]]; function createOption(obj,dara){ for(var i in dara){ var op=new Option(dara[i],i); obj.options.add(op); } } var province = document.getElementById("province") createOption(province,provinceArr); var city = document.getElementById("city") province.onchange=function(){ city.options.length=0; createOption(city,cityArr[province.value]); } var town = document.getElementById("town") city.onchange=function(){ town.options.length=0; createOption(town,townArr[province.value][city.value]); } </script>