/*
*  全国二级城市联动 js版
*/
function Dsy(){
  this.Items = {};
}
Dsy.prototype.add = function(id,iArray){
  this.Items[id] = iArray;
}
Dsy.prototype.Exists = function(id){
  if(typeof(this.Items[id]) == \"undefined\") return false;
  return true;
}

function change(v){
  var str=\"0\";
  for(i=0;i<v;i++){
    str+=(\"_\"+(document.getElementById(s[i]).selectedIndex-1));
  };
  var ss=document.getElementById(s[v]);
  with(ss){
    length = 0;
    options[0]=new Option(opt0[v],opt0[v]);
    if(v && document.getElementById(s[v-1]).selectedIndex>0 || !v){
      if(dsy.Exists(str)){
        ar = dsy.Items[str];
        for(i=0;i<ar.length;i++){
          options[length]=new Option(ar[i],ar[i]);
        }//end for
        if(v){ options[0].selected = true; }
      }
    }//end if v
    if(++v<s.length){change(v);}
  }//End with
}

var dsy = new Dsy();

dsy.add(\"0\",[\"北京市\",\"天津市\",\"上海市\",\"重庆市\",\"河北省\",\"山西省\",\"内蒙古\",\"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\",\"海南省\",\"四川省\",\"贵州省\",\"云南省\",\"西藏\",\"陕西省\",\"甘肃省\",\"青海省\",\"宁夏\",\"新疆\",\"香港\",\"澳门\",\"台湾省\"]);
dsy.add(\"0_0\",[\"东城区\",\"西城区\",\"崇文区\",\"宣武区\",\"朝阳区\",\"丰台区\",\"石景山区\",\"海淀区\",\"门头沟区\",\"房山区\",\"通州区\",\"顺义区\",\"昌平区\",\"大兴区\",\"怀柔区\",\"平谷区\",\"密云县\",\"延庆县\",\"延庆镇\"]);
dsy.add(\"0_1\",[\"和平区\",\"河东区\",\"河西区\",\"南开区\",\"河北区\",\"红桥区\",\"塘沽区\",\"汉沽区\",\"大港区\",\"东丽区\",\"西青区\",\"津南区\",\"北辰区\",\"武清区\",\"宝坻区\",\"蓟县\",\"宁河县\",\"芦台镇\",\"静海县\",\"静海镇\"]);
dsy.add(\"0_2\",[\"黄浦区\",\"卢湾区\",\"徐汇区\",\"长宁区\",\"静安区\",\"普陀区\",\"闸北区\",\"虹口区\",\"杨浦区\",\"闵行区\",\"宝山区?\",\"嘉定区\",\"浦东新区\",\"金山区\",\"松江区\",\"青浦区\",\"南汇区\",\"奉贤区\",\"崇明县\",\"城桥镇\"]);
dsy.add(\"0_3\",[\"渝中区\",\"大渡口区\",\"江北区\",\"沙坪坝区\",\"九龙坡区\",\"南岸区\",\"北碚区\",\"万盛区\",\"双桥区\",\"渝北区\",\"巴南区\",\"万州区\",\"涪陵区\",\"黔江区\",\"长寿区\",\"合川市\",\"永川区市\",\"江津市\",\"南川市\",\"綦江县\",\"潼南县\",\"铜梁县\",\"大足县\",\"荣昌县\",\"璧山县\",\"垫江县\",\"武隆县\",\"丰都县\",\"城口县\",\"梁平县\",\"开县\",\"巫溪县\",\"巫山县\",\"奉节县\",\"云阳县\",\"忠县\",\"石柱土家族自治县\",\"彭水苗族土家族自治县\",\"酉阳土家族苗族自治县\",\"秀山土家族苗族自治县\"]);
dsy.add(\"0_4\",[\"石家庄市\",\"张家口市\",\"承德市\",\"秦皇岛市\",\"唐山市\",\"廊坊市\",\"保定市\",\"衡水市\",\"沧州市\",\"邢台市\",\"邯郸市\"]);
dsy.add(\"0_5\",[\"太原市\",\"朔州市\",\"大同市\",\"阳泉市\",\"长治市\",\"晋城市\",\"忻州市\",\"晋中市\",\"临汾市\",\"吕梁市\",\"运城市\"]);
dsy.add(\"0_6\",[\"呼和浩特市\",\"包头市\",\"乌海市\",\"赤峰市\",\"通辽市\",\"呼伦贝尔市\",\"鄂尔多斯市\",\"乌兰察布市\",\"巴彦淖尔市\",\"兴安盟\",\"锡林郭勒盟\",\"阿拉善盟\"]);
dsy.add(\"0_7\",[\"沈阳市\",\"朝阳市\",\"阜新市\",\"铁岭市\",\"抚顺市\",\"本溪市\",\"辽阳市\",\"鞍山市\",\"丹东市\",\"大连市\",\"营口市\",\"盘锦市\",\"锦州市\",\"葫芦岛市\"]);
dsy.add(\"0_8\",[\"长春市\",\"白城市\",\"松原市\",\"吉林市\",\"四平市\",\"辽源市\",\"通化市\",\"白山市\",\"延边州\"]);
dsy.add(\"0_9\",[\"哈尔滨市\",\"齐齐哈尔市\",\"七台河市\",\"黑河市\",\"大庆市\",\"鹤岗市\",\"伊春市\",\"佳木斯市\",\"双鸭山市\",\"鸡西市\",\"牡丹江市\",\"绥化市\",\"大兴安岭地区\"]);
dsy.add(\"0_10\",[\"南京市\",\"徐州市\",\"连云港市\",\"宿迁市\",\"淮安市\",\"盐城市\",\"扬州市\",\"泰州市\",\"南通市\",\"镇江市\",\"常州市\",\"无锡市\",\"苏州市\"]);
dsy.add(\"0_11\",[\"杭州市\",\"湖州市\",\"嘉兴市\",\"舟山市\",\"宁波市\",\"绍兴市\",\"衢州市\",\"金华市\",\"台州市\",\"温州市\",\"丽水市\"]);
dsy.add(\"0_12\",[\"合肥市\",\"宿州市\",\"淮北市\",\"亳州市\",\"阜阳市\",\"蚌埠市\",\"淮南市\",\"滁州市\",\"马鞍山市\",\"芜湖市\",\"铜陵市\",\"安庆市\",\"黄山市\",\"六安市\",\"巢湖市\",\"池州市\",\"宣城市\"]);
dsy.add(\"0_13\",[\"福州市\",\"南平市\",\"莆田市\",\"三明市\",\"泉州市\",\"厦门市\",\"漳州市\",\"龙岩市\",\"宁德市\"]);
dsy.add(\"0_14\",[\"南昌市\",\"九江市\",\"景德镇市\",\"鹰潭市\",\"新余市\",\"萍乡市\",\"赣州市\",\"上饶市\",\"抚州市\",\"宜春市\",\"吉安市\"]);
dsy.add(\"0_15\",[\"济南市\",\"青岛市\",\"聊城市\",\"德州市\",\"东营市\",\"淄博市\",\"潍坊市\",\"烟台市\",\"威海市\",\"日照市\",\"临沂市\",\"枣庄市\",\"济宁市\",\"泰安市\",\"莱芜市\",\"滨州市\",\"菏泽市\"]);
dsy.add(\"0_16\",[\"郑州市\",\"开封市\",\"三门峡市\",\"洛阳市\",\"焦作市\",\"新乡市\",\"鹤壁市\",\"安阳市\",\"濮阳市\",\"商丘市\",\"许昌市\",\"漯河市\",\"平顶山市\",\"南阳市\",\"信阳市\",\"周口市\",\"驻马店市\",\"济源市\"]);
dsy.add(\"0_17\",[\"武汉市\",\"十堰市\",\"襄樊市\",\"荆门市\",\"孝感市\",\"黄冈市\",\"鄂州市\",\"黄石市\",\"咸宁市\",\"荆州市\",\"宜昌市\",\"随州市\",\"省直辖县级行政单位\",\"恩施州\"]);
dsy.add(\"0_18\",[\"长沙市\",\"张家界市\",\"常德市\",\"益阳市\",\"岳阳市\",\"株洲市\",\"湘潭市\",\"衡阳市\",\"郴州市\",\"永州市\",\"邵阳市\",\"怀化市\",\"娄底市\",\"湘西州\"]);
dsy.add(\"0_19\",[\"广州市\",\"深圳市\",\"清远市\",\"韶关市\",\"河源市\",\"梅州市\",\"潮州市\",\"汕头市\",\"揭阳市\",\"汕尾市\",\"惠州市\",\"东莞市\",\"珠海市\",\"中山市\",\"江门市\",\"佛山市\",\"肇庆市\",\"云浮市\",\"阳江市\",\"茂名市\",\"湛江市\"]);
dsy.add(\"0_20\",[\"南宁市\",\"桂林市\",\"柳州市\",\"梧州市\",\"贵港市\",\"玉林市\",\"钦州市\",\"北海市\",\"防城港市\",\"崇左市\",\"百色市\",\"河池市\",\"来宾市\",\"贺州市\"]);
dsy.add(\"0_21\",[\"海口市\",\"三亚市\",\"省直辖行政单位\"]);
dsy.add(\"0_22\",[\"成都市\",\"广元市\",\"绵阳市\",\"德阳市\",\"南充市\",\"广安市\",\"遂宁市\",\"内江市\",\"乐山市\",\"自贡市\",\"泸州市\",\"宜宾市\",\"攀枝花市\",\"巴中市\",\"达州市\",\"资阳市\",\"眉山市\",\"雅安市\",\"阿坝州\",\"甘孜州\",\"凉山州\"]);
dsy.add(\"0_23\",[\"贵阳市\",\"六盘水市\",\"遵义市\",\"安顺市\",\"毕节地区\",\"铜仁地区\",\"黔东南州\",\"黔南州\",\"黔西南州\"]);
dsy.add(\"0_24\",[\"昆明市\",\"曲靖市\",\"玉溪市\",\"保山市\",\"昭通市\",\"丽江市\",\"思茅市\",\"临沧市\",\"德宏州\",\"怒江州\",\"迪庆州\",\"大理州\",\"楚雄州\",\"红河州\",\"文山州\",\"西双版纳州\"]);
dsy.add(\"0_25\",[\"拉萨市\",\"那曲地区\",\"昌都地区\",\"林芝地区\",\"山南地区\",\"日喀则地区\",\"阿里地区\"]);
dsy.add(\"0_26\",[\"西安市\",\"延安市\",\"铜川市\",\"渭南市\",\"咸阳市\",\"宝鸡市\",\"汉中市\",\"榆林市\",\"安康市\",\"商洛市\"]);
dsy.add(\"0_27\",[\"兰州市\",\"嘉峪关市\",\"白银市\",\"天水市\",\"武威市\",\"酒泉市\",\"张掖市\",\"庆阳市\",\"平凉市\",\"定西市\",\"陇南市\",\"临夏州\",\"甘南州\"]);
dsy.add(\"0_28\",[\"西宁市\",\"海东地区\",\"海北州\",\"海南州\",\"黄南州\",\"果洛州\",\"玉树州\",\"海西州\"]);
dsy.add(\"0_29\",[\"银川市\",\"石嘴山市\",\"吴忠市\",\"固原市\",\"中卫市\"]);
dsy.add(\"0_30\",[\"乌鲁木齐市\",\"克拉玛依市\",\"自治区直辖县级行政单位\",\"喀什地区\",\"阿克苏地区\",\"和田地区\",\"吐鲁番地区\",\"哈密地区\",\"克孜勒苏柯州\",\"博尔塔拉州\",\"昌吉州\",\"巴音郭楞州\",\"伊犁州\",\"塔城地区\",\"阿勒泰地区\"]);
dsy.add(\"0_31\",[\"香港特别行政区\"]);
dsy.add(\"0_32\",[\"澳门特别行政区\"]);
dsy.add(\"0_33\",[\"台北\",\"高雄\",\"台中\",\"花莲\",\"基隆\",\"嘉义\",\"金门\",\"连江\",\"苗栗\",\"南投\",\"澎湖\",\"屏东\",\"台东\",\"台南\",\"桃园\",\"新竹\",\"宜兰\",\"云林\",\"彰化\"]);
dsy.add(\"0\",[\"北京市\",\"天津市\",\"上海市\",\"重庆市\",\"河北省\",\"山西省\",\"内蒙古\",\"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\",\"海南省\",\"四川省\",\"贵州省\",\"云南省\",\"西藏\",\"陕西省\",\"甘肃省\",\"青海省\",\"宁夏\",\"新疆\",\"香港\",\"澳门\",\"台湾省\"]);

var s=[\"s_province\",\"s_city\"];//三个select的name
var opt0 = [\"省份\",\"地级市\"];//初始值
function _init_area(){ //初始化函数
  for(i=0;i<s.length-1;i++){
   document.getElementById(s[i]).onchange=new Function(\"change(\"+(i+1)+\")\");
  }
  change(0);
}

<head>
<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />
<title>全国城市二级联动</title>
<style type=\"text/css\">
body{ background:#EEEEEE;margin:0; padding:0; font-family:\"微软雅黑\", Arial, Helvetica, sans-serif; }
a{ color:#006600; text-decoration:none;}
a:hover{color:#990000;}
.top{ margin:5px auto; color:#990000; text-align:center;}
.info select{ border:1px #993300 solid; background:#FFFFFF;}
.info{ margin:5px; text-align:center;}
.info #show{ color:#3399FF; }
.bottom{ text-align:right; font-size:12px; color:#CCCCCC; width:1000px;}
</style>
</head>
<body>
<div class=\"top\">
  <h1>全国城市二级联动</h1>
</div>
<div class=\"info\">
  <div>
  <select id=\"s_province\" name=\"s_province\"></select> 
  <select id=\"s_city\" name=\"s_city\" ></select> 
  <script class=\"resources library\" src=\"area.js\" type=\"text/javascript\"></script>
  <script type=\"text/javascript\">_init_area();</script>
  </div>
</div>
</body>
</html>