比较好的二级联动:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML><HEAD><TITLE> New Document </TITLE><META NAME="Generator" CONTENT="EditPlus"><META NAME="Author" CONTENT=""><META NAME="Keywords" CONTENT=""><META NAME="Description" CONTENT=""><script language="javascript" type="text/javascript">provinceArray = new Array("北京市","上海市","天津市","重庆市","河北省","山西省","内蒙古自治区","辽宁省","吉林省","黑龙江省","江苏省","浙江省","安徽省","福建省","江西省","山东省","河南省","湖北省","湖南省","广东省","广西壮族自治区","海南省","四川省","贵州省","云南省","西藏自治区","陕西省","甘肃省","宁夏回族自治区","青海省","新疆维吾尔族自治区","香港特别行政区","澳门特别行政区","台湾省","其它");//定义 城市 数据数组cityArray = new Array(); cityArray[0] = new Array("北京市","东城|西城|崇文|宣武|朝阳|丰台|石景山|海淀|门头沟|房山|通州|顺义|昌平|大兴|平谷|怀柔|密云|延庆"); cityArray[1] = new Array("上海市","黄浦|卢湾|徐汇|长宁|静安|普陀|闸北|虹口|杨浦|闵行|宝山|嘉定|浦东|金山|松江|青浦|南汇|奉贤|崇明"); cityArray[2] = new Array("天津市","和平|东丽|河东|西青|河西|津南|南开|北辰|河北|武清|红挢|塘沽|汉沽|大港|宁河|静海|宝坻|蓟县"); cityArray[3] = new Array("重庆市","万州|涪陵|渝中|大渡口|江北|沙坪坝|九龙坡|南岸|北碚|万盛|双挢|渝北|巴南|黔江|长寿|綦江|潼南|铜梁 |大足|荣昌|壁山|梁平|城口|丰都|垫江|武隆|忠县|开县|云阳|奉节|巫山|巫溪|石柱|秀山|酉阳|彭水|江津|合川|永川|南川"); cityArray[4] = new Array("河北省","石家庄|邯郸|邢台|保定|张家口|承德|廊坊|唐山|秦皇岛|沧州|衡水"); cityArray[5] = new Array("山西省","太原|大同|阳泉|长治|晋城|朔州|吕梁|忻州|晋中|临汾|运城"); cityArray[6] = new Array("内蒙古自治区","呼和浩特|包头|乌海|赤峰|呼伦贝尔盟|阿拉善盟|哲里木盟|兴安盟|乌兰察布盟|锡林郭勒盟|巴彦淖尔盟|伊克昭盟"); cityArray[7] = new Array("辽宁省","沈阳|大连|鞍山|抚顺|本溪|丹东|锦州|营口|阜新|辽阳|盘锦|铁岭|朝阳|葫芦岛"); cityArray[8] = new Array("吉林省","长春|吉林|四平|辽源|通化|白山|松原|白城|延边"); cityArray[9] = new Array("黑龙江省","哈尔滨|齐齐哈尔|牡丹江|佳木斯|大庆|绥化|鹤岗|鸡西|黑河|双鸭山|伊春|七台河|大兴安岭"); cityArray[10] = new Array("江苏省","南京|镇江|苏州|南通|扬州|盐城|徐州|连云港|常州|无锡|宿迁|泰州|淮安"); cityArray[11] = new Array("浙江省","杭州|宁波|温州|嘉兴|湖州|绍兴|金华|衢州|舟山|台州|丽水"); cityArray[12] = new Array("安徽省","合肥|芜湖|蚌埠|马鞍山|淮北|铜陵|安庆|黄山|滁州|宿州|池州|淮南|巢湖|阜阳|六安|宣城|亳州"); cityArray[13] = new Array("福建省","福州|厦门|莆田|三明|泉州|漳州|南平|龙岩|宁德"); cityArray[14] = new Array("江西省","南昌市|景德镇|九江|鹰潭|萍乡|新馀|赣州|吉安|宜春|抚州|上饶"); cityArray[15] = new Array("山东省","济南|青岛|淄博|枣庄|东营|烟台|潍坊|济宁|泰安|威海|日照|莱芜|临沂|德州|聊城|滨州|菏泽"); cityArray[16] = new Array("河南省","郑州|开封|洛阳|平顶山|安阳|鹤壁|新乡|焦作|濮阳|许昌|漯河|三门峡|南阳|商丘|信阳|周口|驻马店|济源"); cityArray[17] = new Array("湖北省","武汉|宜昌|荆州|襄樊|黄石|荆门|黄冈|十堰|恩施|潜江|天门|仙桃|随州|咸宁|孝感|鄂州");cityArray[18] = new Array("湖南省","长沙|常德|株洲|湘潭|衡阳|岳阳|邵阳|益阳|娄底|怀化|郴州|永州|湘西|张家界"); cityArray[19] = new Array("广东省","广州|深圳|珠海|汕头|东莞|中山|佛山|韶关|江门|湛江|茂名|肇庆|惠州|梅州|汕尾|河源|阳江|清远|潮州|揭阳|云浮"); cityArray[20] = new Array("广西壮族自治区","南宁|柳州|桂林|梧州|北海|防城港|钦州|贵港|玉林|南宁地区|柳州地区|贺州|百色|河池"); cityArray[21] = new Array("海南省","海口|三亚"); cityArray[22] = new Array("四川省","成都|绵阳|德阳|自贡|攀枝花|广元|内江|乐山|南充|宜宾|广安|达川|雅安|眉山|甘孜|凉山|泸州"); cityArray[23] = new Array("贵州省","贵阳|六盘水|遵义|安顺|铜仁|黔西南|毕节|黔东南|黔南"); cityArray[24] = new Array("云南省","昆明|大理|曲靖|玉溪|昭通|楚雄|红河|文山|思茅|西双版纳|保山|德宏|丽江|怒江|迪庆|临沧");cityArray[25] = new Array("西藏自治区","拉萨|日喀则|山南|林芝|昌都|阿里|那曲"); cityArray[26] = new Array("陕西省","西安|宝鸡|咸阳|铜川|渭南|延安|榆林|汉中|安康|商洛"); cityArray[27] = new Array("甘肃省","兰州|嘉峪关|金昌|白银|天水|酒泉|张掖|武威|定西|陇南|平凉|庆阳|临夏|甘南"); cityArray[28] = new Array("宁夏回族自治区","银川|石嘴山|吴忠|固原"); cityArray[29] = new Array("青海省","西宁|海东|海南|海北|黄南|玉树|果洛|海西"); cityArray[30] = new Array("新疆维吾尔族自治区","乌鲁木齐|石河子|克拉玛依|伊犁|巴音郭勒|昌吉|克孜勒苏柯尔克孜|博尔塔拉|吐鲁番|哈密|喀什|和田|阿克苏"); cityArray[31] = new Array("香港特别行政区","香港特别行政区"); cityArray[32] = new Array("澳门特别行政区","澳门特别行政区"); cityArray[33] = new Array("台湾省","台北|高雄|台中|台南|屏东|南投|云林|新竹|彰化|苗栗|嘉义|花莲|桃园|宜兰|基隆|台东|金门|马祖|澎湖"); cityArray[34] = new Array("其它","北美洲|南美洲|亚洲|非洲|欧洲|大洋洲");function initProvince(){document.all.selProvince.length = 0 ; for(i=0; i<provinceArray.length; i++){ document.all.selProvince.options[i] = new Option(provinceArray[i],provinceArray[i]);}getCity(document.all.selProvince.options[0].value)}function getCity(currProvince){ //当前 所选择 的 省 var currProvince = currProvince; var i,j,k; //清空 城市 下拉选单 document.all.selCity.length = 0 ; for (i = 0 ;i <cityArray.length;i++) { //得到 当前省 在 城市数组中的位置 if(cityArray[i][0]==currProvince) { //得到 当前省 所辖制的 地市 tmpcityArray = cityArray[i][1].split("|") for(j=0;j<tmpcityArray.length;j++) { //填充 城市 下拉选单 document.all.selCity.options[document.all.selCity.length] = new Option(tmpcityArray[j],tmpcityArray[j]); } } } }</script></HEAD><BODY onload="initProvince()">选择省市: <select name="province" id="selProvince" onChange = "getCity(this.options[this.selectedIndex].value)"> </select> <select name="city" id="selCity"> <option>北京</option> </select></BODY></HTML>
二级联动:
<html><head> <title></title><meta http-equiv="Content-Type" content="text/html; charset=gb2312"></head><body bgcolor=#FFFFFF alink=#333333 vlink=#333333 link=#333333 topmargin=0 leftmargin=0><form action="http://www.chinaleader.com/cgi-bin/register.cgi" method=post name="creator" enctype="multipart/form-data"><script language="javascript"><!--var where = new Array(35); function comefrom(loca,locacity) { this.loca = loca; this.locacity = locacity; } where[0]= new comefrom("请选择省份名","请选择城市名");where[1] = new comefrom("北京","|东城|西城|崇文|宣武|朝阳|丰台|石景山|海淀|门头沟|房山|通州|顺义|昌平|大兴|平谷|怀柔|密云|延庆"); where[2] = new comefrom("上海","|黄浦|卢湾|徐汇|长宁|静安|普陀|闸北|虹口|杨浦|闵行|宝山|嘉定|浦东|金山|松江|青浦|南汇|奉贤|崇明"); where[3] = new comefrom("天津","|和平|东丽|河东|西青|河西|津南|南开|北辰|河北|武清|红挢|塘沽|汉沽|大港|宁河|静海|宝坻|蓟县"); where[4] = new comefrom("重庆","|万州|涪陵|渝中|大渡口|江北|沙坪坝|九龙坡|南岸|北碚|万盛|双挢|渝北|巴南|黔江|长寿|綦江|潼南|铜梁|大足|荣昌|壁山|梁平|城口|丰都|垫江|武隆|忠县|开县|云阳|奉节|巫山|巫溪|石柱|秀山|酉阳|彭水|江津|合川|永川|南川"); where[5] = new comefrom("河北","|石家庄|邯郸|邢台|保定|张家口|承德|廊坊|唐山|秦皇岛|沧州|衡水"); where[6] = new comefrom("山西","|太原|大同|阳泉|长治|晋城|朔州|吕梁|忻州|晋中|临汾|运城"); where[7] = new comefrom("内蒙古","|呼和浩特|包头|乌海|赤峰|呼伦贝尔盟|阿拉善盟|哲里木盟|兴安盟|乌兰察布盟|锡林郭勒盟|巴彦淖尔盟|伊克昭盟"); where[8] = new comefrom("辽宁","|沈阳|大连|鞍山|抚顺|本溪|丹东|锦州|营口|阜新|辽阳|盘锦|铁岭|朝阳|葫芦岛"); where[9] = new comefrom("吉林","|长春|吉林|四平|辽源|通化|白山|松原|白城|延边"); where[10] = new comefrom("黑龙江","|哈尔滨|齐齐哈尔|牡丹江|佳木斯|大庆|绥化|鹤岗|鸡西|黑河|双鸭山|伊春|七台河|大兴安岭"); where[11] = new comefrom("江苏","|南京|镇江|苏州|南通|扬州|盐城|徐州|连云港|常州|无锡|宿迁|泰州|淮安"); where[12] = new comefrom("浙江","|杭州|宁波|温州|嘉兴|湖州|绍兴|金华|衢州|舟山|台州|丽水"); where[13] = new comefrom("安徽","|合肥|芜湖|蚌埠|马鞍山|淮北|铜陵|安庆|黄山|滁州|宿州|池州|淮南|巢湖|阜阳|六安|宣城|亳州"); where[14] = new comefrom("福建","|福州|厦门|莆田|三明|泉州|漳州|南平|龙岩|宁德"); where[15] = new comefrom("江西","|南昌市|景德镇|九江|鹰潭|萍乡|新馀|赣州|吉安|宜春|抚州|上饶"); where[16] = new comefrom("山东","|济南|青岛|淄博|枣庄|东营|烟台|潍坊|济宁|泰安|威海|日照|莱芜|临沂|德州|聊城|滨州|菏泽"); where[17] = new comefrom("河南","|郑州|开封|洛阳|平顶山|安阳|鹤壁|新乡|焦作|濮阳|许昌|漯河|三门峡|南阳|商丘|信阳|周口|驻马店|济源"); where[18] = new comefrom("湖北","|武汉|宜昌|荆州|襄樊|黄石|荆门|黄冈|十堰|恩施|潜江|天门|仙桃|随州|咸宁|孝感|鄂州");where[19] = new comefrom("湖南","|长沙|常德|株洲|湘潭|衡阳|岳阳|邵阳|益阳|娄底|怀化|郴州|永州|湘西|张家界"); where[20] = new comefrom("广东","|广州|深圳|珠海|汕头|东莞|中山|佛山|韶关|江门|湛江|茂名|肇庆|惠州|梅州|汕尾|河源|阳江|清远|潮州|揭阳|云浮"); where[21] = new comefrom("广西","|南宁|柳州|桂林|梧州|北海|防城港|钦州|贵港|玉林|南宁地区|柳州地区|贺州|百色|河池"); where[22] = new comefrom("海南","|海口|三亚"); where[23] = new comefrom("四川","|成都|绵阳|德阳|自贡|攀枝花|广元|内江|乐山|南充|宜宾|广安|达川|雅安|眉山|甘孜|凉山|泸州"); where[24] = new comefrom("贵州","|贵阳|六盘水|遵义|安顺|铜仁|黔西南|毕节|黔东南|黔南"); where[25] = new comefrom("云南","|昆明|大理|曲靖|玉溪|昭通|楚雄|红河|文山|思茅|西双版纳|保山|德宏|丽江|怒江|迪庆|临沧");where[26] = new comefrom("西藏","|拉萨|日喀则|山南|林芝|昌都|阿里|那曲"); where[27] = new comefrom("陕西","|西安|宝鸡|咸阳|铜川|渭南|延安|榆林|汉中|安康|商洛"); where[28] = new comefrom("甘肃","|兰州|嘉峪关|金昌|白银|天水|酒泉|张掖|武威|定西|陇南|平凉|庆阳|临夏|甘南"); where[29] = new comefrom("宁夏","|银川|石嘴山|吴忠|固原"); where[30] = new comefrom("青海","|西宁|海东|海南|海北|黄南|玉树|果洛|海西"); where[31] = new comefrom("新疆","|乌鲁木齐|石河子|克拉玛依|伊犁|巴音郭勒|昌吉|克孜勒苏柯尔克孜|博尔塔拉|吐鲁番|哈密|喀什|和田|阿克苏"); where[32] = new comefrom("香港",""); where[33] = new comefrom("澳门",""); where[34] = new comefrom("台湾","|台北|高雄|台中|台南|屏东|南投|云林|新竹|彰化|苗栗|嘉义|花莲|桃园|宜兰|基隆|台东|金门|马祖|澎湖"); where[35] = new comefrom("其它","|北美洲|南美洲|亚洲|非洲|欧洲|大洋洲"); function select() {with(document.creator.province) { var loca2 = options[selectedIndex].value; }for(i = 0;i < where.length;i ++) {if (where[i].loca == loca2) {loca3 = (where[i].locacity).split("|");for(j = 0;j < loca3.length;j++) { with(document.creator.city) { length = loca3.length; options[j].text = loca3[j]; options[j].value = loca3[j]; var loca4=options[selectedIndex].value;}}break;}}document.creator.newlocation.value=loca2+loca4;}function init() {with(document.creator.province) {length = where.length;for(k=0;k<where.length;k++) { options[k].text = where[k].loca; options[k].value = where[k].loca; }options[selectedIndex].text = where[0].loca; options[selectedIndex].value = where[0].loca;}with(document.creator.city) {loca3 = (where[0].locacity).split("|");length = loca3.length;for(l=0;l<length;l++) { options[l].text = loca3[l]; options[l].value = loca3[l]; }options[selectedIndex].text = loca3[0]; options[selectedIndex].value = loca3[0];}}--></script><body onload="init()"><font color=#000000><b>来自：</b><br>请输入您所在国家的具体地方。此项可选<br><br>省份 <select name="province" onChange = "select()"></select> 城市 <select name="city" onChange = "select()"></select><br>我在 <input type=text name="newlocation" maxlength=12 size=12 style="font-weight: bold"> 不能超过12个字符（6个汉字）</form>
三级联动的xml太长了,不粘出来了,可以下载源码
相关资源：javascript解析xml实现省市县三级联动的方法
