js、jq實作省市級聯

$(document).ready(function(){

var arr = new Array();
 //直轄市
 arr["北京市"] = ["東城", "東城", "西城", "西城", "崇文", "宣武",  "朝陽",  "豐台", "豐台","石景山",  "海澱",  "門頭溝", "房山", "通州", ];
 arr["上海市"] = ["上海市"];
 arr["天津市"] = ["天津市"];
 arr["重慶市"] = ["重慶市"];
 //華北地區
 arr["河北省"] = ["石家莊","唐山","秦皇島","邯鄲","邢台","保定","張家口","承德","滄州","廊坊","衡水"];
 arr["山西省"] = ["太原","大同","陽泉","長治","晉城","朔州","晉中","運城","忻州","臨汾","呂梁"];
 arr["内蒙古自治區"] = ["呼和浩特","標頭","烏海","赤峰","通遼","鄂爾多斯","呼倫貝爾","巴彥淖爾","烏蘭察布","興安","錫林郭勒","阿拉善"];
 //東北地區
 arr["遼甯省"] = ["沈陽","大連","鞍山","撫順","本溪","丹東","錦州","營口","阜新","遼陽","盤錦","鐵嶺","朝陽","葫蘆島"];
 arr["吉林省"] = ["長春","吉林","四平","遼源","通化","白山","松原","白城","延邊"],
 arr["黑龍江"] = ["哈爾濱","齊齊哈爾","雞西","鶴崗","雙鴨山","大慶","伊春","佳木斯","七台河","牡丹江","黑河","綏化","大興安嶺"];
 //華東地區
 arr["江蘇省"] = ["南京","無錫","徐州","常州","蘇州","南通","連雲港","淮安","鹽城","揚州","鎮江","泰州","宿遷"];
 arr["浙江省"] = ["杭州","甯波","溫州","嘉興","湖州","紹興","金華","衢州","舟山","台州","麗水"];
 arr["安徽省"] = ["合肥","蕪湖","蚌埠","淮南","馬鞍山","淮北","銅陵","安慶","黃山","滁州","阜陽","宿州","巢湖","六安","亳州","池州","宣城"];
 arr["福建省"] = ["福州","廈門","莆田","三明","泉州","漳州","南平","龍岩","甯德"];
 arr["江西省"] = ["南昌","景德鎮","萍鄉","九江","新餘","鷹潭","贛州","吉安","宜春","撫州","上饒"];
 arr["山東省"] = ["濟南","青島","淄博","棗莊","東營","煙台","濰坊","威海","濟甯","泰安","日照","萊蕪","臨沂","德州","聊城","濱州","菏澤"];
 //中南地區
 arr["河南省"] = ["鄭州","開封","洛陽","平頂山","焦作","鶴壁","新鄉","安陽","濮陽","許昌","漯河","三門峽","南陽","商丘","信陽","周口","駐馬店"];
 arr["湖北省"] = ["武漢","黃石","襄樊","十堰","荊州","宜昌","荊門","鄂州","孝感","鹹甯","随州","恩施"];
 arr["湖南省"] = ["長沙","株洲","湘潭","衡陽","邵陽","嶽陽","常德","張家界","益陽","郴州","永州","懷化","婁底","湘西"],
 arr["廣東省"] = ["廣州","深圳","珠海","汕頭","韶關","佛山","江門","湛江","茂名","肇慶","惠州","梅州","汕尾","河源","陽江","清遠","東莞","中山","潮州","揭陽","雲浮"];
 arr["廣西自治區"] = ["南甯","柳州","桂林","梧州","北海","防城港","欽州","貴港","玉林","百色","賀州","河池","來賓","崇左"];
 arr["海南省"] = ["海口","三亞"];
 //西南地區
 arr["四川省"] = ["成都","自貢","攀枝花","泸州","德陽","綿陽","廣元","遂甯","内江","樂山","南充","宜賓","廣安","達州","眉山","雅安","巴中","資陽","阿壩","甘孜","涼山"];
 arr["貴州省"] = ["貴陽","六盤水","遵義","安順","銅仁","畢節","黔西南","黔東南","黔南"];
 arr["雲南省"] = ["昆明","曲靖","玉溪","保山","昭通","麗江","普洱","臨滄","文山","紅河","西雙版納","楚雄","大理","德宏","怒江","迪慶"];
 arr["西藏自治區"] = ["拉薩","昌都","山南","日喀則","那曲","阿裡","林芝"];
 //西北地區
 arr["陝西省"] = ["西安","銅川","寶雞","鹹陽","渭南","延安","漢中","榆林","安康","商洛"];
 arr["甘肅省"] = ["蘭州","嘉峪關","金昌","白銀","天水","武威","張掖","平涼","酒泉","慶陽","定西","隴南","臨夏","甘南"];
 arr["青海省"] = ["西甯","海東","海北","黃南","海南","果洛","玉樹","海西"];
 arr["甯夏自治區"] = ["銀川","石嘴山","吳忠","固原","中衛"];
 arr["新疆自治區"] = ["烏魯木齊","克拉瑪依","吐魯番","哈密","和田","阿克蘇","喀什","克孜勒蘇柯爾克孜","巴音郭楞蒙古","昌吉","博爾塔拉蒙古","伊犁哈薩克","塔城","阿勒泰"];
 //港澳台
 arr["香港特别行政區"] = ["香港特别行政區"];
 arr["澳門特别行政區"] = ["澳門特别行政區"];
 arr["台灣省"] = ["台北","高雄","基隆","台中","台南","新竹","嘉義"];
 
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);
	}
})
})