js、jq实现省市级联

$(document).ready(function(){var arr = new Array(); //直辖市 arr["北京市"] = ["东城", "东城", "西城", "西城", "崇文", "宣武",  "朝阳",  "丰台", "丰台","石景山",  "海淀",  "门头沟", "房山", "通州", ]; arr["上海市"] = ["上海市"]; arr["天津市"] = ["天津市"]; arr["重庆市"] = ["重庆市"]; //华北地区 arr["河北省"] = ["石家庄","唐山","秦皇岛","邯郸","邢台","保定","张家口","承德","沧州","廊坊","衡水"]; arr["山西省"] = ["太原","大同","阳泉","长治","晋城","朔州","晋中","运城","忻州","临汾","吕梁"]; arr["内蒙古自治区"] = ["呼和浩特","包头","乌海","赤峰","通辽","鄂尔多斯","呼伦贝尔","巴彦淖尔","乌兰察布","兴安","锡林郭勒","阿拉善"]; //东北地区 arr["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"]; arr["吉林省"] = ["长春","吉林","四平","辽源","通化","白山","松原","白城","延边"], arr["黑龙江"] = ["哈尔滨","齐齐哈尔","鸡西","鹤岗","双鸭山","大庆","伊春","佳木斯","七台河","牡丹江","黑河","绥化","大兴安岭"]; //华东地区 arr["江苏省"] = ["南京","无锡","徐州","常州","苏州","南通","连云港","淮安","盐城","扬州","镇江","泰州","宿迁"]; arr["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"]; arr["安徽省"] = ["合肥","芜湖","蚌埠","淮南","马鞍山","淮北","铜陵","安庆","黄山","滁州","阜阳","宿州","巢湖","六安","亳州","池州","宣城"]; arr["福建省"] = ["福州","厦门","莆田","三明","泉州","漳州","南平","龙岩","宁德"]; arr["江西省"] = ["南昌","景德镇","萍乡","九江","新余","鹰潭","赣州","吉安","宜春","抚州","上饶"]; arr["山东省"] = ["济南","青岛","淄博","枣庄","东营","烟台","潍坊","威海","济宁","泰安","日照","莱芜","临沂","德州","聊城","滨州","菏泽"]; //中南地区 arr["河南省"] = ["郑州","开封","洛阳","平顶山","焦作","鹤壁","新乡","安阳","濮阳","许昌","漯河","三门峡","南阳","商丘","信阳","周口","驻马店"]; arr["湖北省"] = ["武汉","黄石","襄樊","十堰","荆州","宜昌","荆门","鄂州","孝感","咸宁","随州","恩施"]; arr["湖南省"] = ["长沙","株洲","湘潭","衡阳","邵阳","岳阳","常德","张家界","益阳","郴州","永州","怀化","娄底","湘西"], arr["广东省"] = ["广州","深圳","珠海","汕头","韶关","佛山","江门","湛江","茂名","肇庆","惠州","梅州","汕尾","河源","阳江","清远","东莞","中山","潮州","揭阳","云浮"]; arr["广西自治区"] = ["南宁","柳州","桂林","梧州","北海","防城港","钦州","贵港","玉林","百色","贺州","河池","来宾","崇左"]; arr["海南省"] = ["海口","三亚"]; //西南地区 arr["四川省"] = ["成都","自贡","攀枝花","泸州","德阳","绵阳","广元","遂宁","内江","乐山","南充","宜宾","广安","达州","眉山","雅安","巴中","资阳","阿坝","甘孜","凉山"]; arr["贵州省"] = ["贵阳","六盘水","遵义","安顺","铜仁","毕节","黔西南","黔东南","黔南"]; arr["云南省"] = ["昆明","曲靖","玉溪","保山","昭通","丽江","普洱","临沧","文山","红河","西双版纳","楚雄","大理","德宏","怒江","迪庆"]; arr["西藏自治区"] = ["拉萨","昌都","山南","日喀则","那曲","阿里","林芝"]; //西北地区 arr["陕西省"] = ["西安","铜川","宝鸡","咸阳","渭南","延安","汉中","榆林","安康","商洛"]; arr["甘肃省"] = ["兰州","嘉峪关","金昌","白银","天水","武威","张掖","平凉","酒泉","庆阳","定西","陇南","临夏","甘南"]; arr["青海省"] = ["西宁","海东","海北","黄南","海南","果洛","玉树","海西"]; arr["宁夏自治区"] = ["银川","石嘴山","吴忠","固原","中卫"]; arr["新疆自治区"] = ["乌鲁木齐","克拉玛依","吐鲁番","哈密","和田","阿克苏","喀什","克孜勒苏柯尔克孜","巴音郭楞蒙古","昌吉","博尔塔拉蒙古","伊犁哈萨克","塔城","阿勒泰"]; //港澳台 arr["香港特别行政区"] = ["香港特别行政区"]; arr["澳门特别行政区"] = ["澳门特别行政区"]; arr["台湾省"] = ["台北","高雄","基隆","台中","台南","新竹","嘉义"]; for (var v in arr) {$("#s1")[0].add(new Option(v,v),null);}$("#s1").change(function(){var key = $("#s1").val();$("#s2")[0].length = 0;for (var v in arr[key]){//alert(arr[key][v]);    $("#s2")[0].add(new Option(arr[key][v],arr[key][v]),null);}})})