js省市联动菜单效果

作者：袖梨 2022-07-02

提示：您可以先修改部分代码再运行

<head>
<meta http-equiv="Content-Type" ontent="text/html; charset=gb2312" />
<title>表单元素[select下拉列表]制作二级联动菜单</title>
<script language="javascript">
//下面函数是演示二，联动菜单的处理代码
function makeplace_a(x){
    var form2=document.wane_search.one.options.length;//这句解释同上
    var wane_searchl=new Array(form2)//新建一个数组，项数为第一个下拉列表的项数
    for(i=0;i<form2;i++)//循环第一个下拉列表的项数那么多次
        wane_searchl[i]=new Array();//子循环
        //下面是给每个循环赋值  
    var place_a=document.wane_search.place_a;//方便引用

wane_searchl[1][0] = new Option("合肥","36"); 
	wane_searchl[1][1] = new Option("安庆","37"); 
	wane_searchl[1][2] = new Option("蚌埠","38"); 
	wane_searchl[1][3] = new Option("亳州","39"); 
	wane_searchl[1][4] = new Option("巢湖","40"); 
	wane_searchl[1][5] = new Option("滁州","41"); 
	wane_searchl[1][6] = new Option("阜阳","42"); 
	wane_searchl[1][7] = new Option("贵池","43"); 
	wane_searchl[1][8] = new Option("淮北","44"); 
	wane_searchl[1][9] = new Option("淮南","46"); 
	wane_searchl[1][10] = new Option("黄山","47"); 
	wane_searchl[1][11] = new Option("九华山","48"); 
	wane_searchl[1][12] = new Option("六安","49"); 
	wane_searchl[1][13] = new Option("马鞍山","50"); 
	wane_searchl[1][14] = new Option("宿州","51"); 
	wane_searchl[1][15] = new Option("铜陵","52"); 
	wane_searchl[1][16] = new Option("屯溪","53"); 
	wane_searchl[1][17] = new Option("芜湖","54"); 
	wane_searchl[1][18] = new Option("宣城","55"); 
	wane_searchl[2][0] = new Option("北京","56"); 
	wane_searchl[3][0] = new Option("重庆","57"); 
	wane_searchl[4][0] = new Option("福州","58"); 
	wane_searchl[4][1] = new Option("福安","59"); 
	wane_searchl[4][2] = new Option("龙岩","60"); 
	wane_searchl[4][3] = new Option("南平","61"); 
	wane_searchl[4][4] = new Option("宁德","62"); 
	wane_searchl[4][5] = new Option("莆田","63"); 
	wane_searchl[4][6] = new Option("泉州","64"); 
	wane_searchl[4][7] = new Option("三明","65"); 
	wane_searchl[4][8] = new Option("邵武","66"); 
	wane_searchl[4][9] = new Option("石狮","67"); 
	wane_searchl[4][10] = new Option("永安","68"); 
	wane_searchl[4][11] = new Option("武夷山","69"); 
	wane_searchl[4][12] = new Option("厦门","70"); 
	wane_searchl[4][13] = new Option("漳州","71"); 
	wane_searchl[5][0] = new Option("兰州","72"); 
	wane_searchl[5][1] = new Option("白银","73"); 
	wane_searchl[5][2] = new Option("定西","74"); 
	wane_searchl[5][3] = new Option("敦煌","75"); 
	wane_searchl[5][4] = new Option("甘南","76"); 
	wane_searchl[5][5] = new Option("金昌","77"); 
	wane_searchl[5][6] = new Option("酒泉","78"); 
	wane_searchl[5][7] = new Option("临夏","79"); 
	wane_searchl[5][8] = new Option("平凉","80"); 
	wane_searchl[5][9] = new Option("天水","81"); 
	wane_searchl[5][10] = new Option("武都","82"); 
	wane_searchl[5][11] = new Option("西峰","83"); 
	wane_searchl[5][12] = new Option("张掖","84"); 
	wane_searchl[6][0] = new Option("广州","85"); 
	wane_searchl[6][1] = new Option("潮阳","86"); 
	wane_searchl[6][2] = new Option("潮州","87"); 
	wane_searchl[6][3] = new Option("澄海","88"); 
	wane_searchl[6][4] = new Option("东莞","89"); 
	wane_searchl[6][5] = new Option("佛山","90"); 
	wane_searchl[6][6] = new Option("河源","91"); 
	wane_searchl[6][7] = new Option("惠州","92"); 
	wane_searchl[6][8] = new Option("江门","93"); 
	wane_searchl[6][9] = new Option("揭阳","94"); 
	wane_searchl[6][10] = new Option("开平","95"); 
	wane_searchl[6][11] = new Option("茂名","96"); 
	wane_searchl[6][12] = new Option("梅州","97"); 
	wane_searchl[6][13] = new Option("清远","98"); 
	wane_searchl[6][14] = new Option("汕头","99"); 
	wane_searchl[6][15] = new Option("汕尾","100"); 
	wane_searchl[6][16] = new Option("韶关","101"); 
	wane_searchl[6][17] = new Option("深圳","102"); 
	wane_searchl[6][18] = new Option("顺德","103"); 
	wane_searchl[6][19] = new Option("阳江","104"); 
	wane_searchl[6][20] = new Option("英德","105"); 
	wane_searchl[6][21] = new Option("云浮","106"); 
	wane_searchl[6][22] = new Option("增城","107"); 
	wane_searchl[6][23] = new Option("湛江","108"); 
	wane_searchl[6][24] = new Option("肇庆","109"); 
	wane_searchl[6][25] = new Option("中山","110"); 
	wane_searchl[6][26] = new Option("珠海","111"); 
	wane_searchl[7][0] = new Option("南宁","112"); 
	wane_searchl[7][1] = new Option("百色","113"); 
	wane_searchl[7][2] = new Option("北海","114"); 
	wane_searchl[7][3] = new Option("桂林","115"); 
	wane_searchl[7][4] = new Option("防城港","116"); 
	wane_searchl[7][5] = new Option("河池","117"); 
	wane_searchl[7][6] = new Option("柳州","118"); 
	wane_searchl[7][7] = new Option("钦州","119"); 
	wane_searchl[7][8] = new Option("梧州","120"); 
	wane_searchl[7][9] = new Option("玉林","121"); 
	wane_searchl[8][0] = new Option("贵阳","122"); 
	wane_searchl[8][1] = new Option("安顺","123"); 
	wane_searchl[8][2] = new Option("毕节","124"); 
	wane_searchl[8][3] = new Option("都匀","125"); 
	wane_searchl[8][4] = new Option("凯里","126"); 
	wane_searchl[8][5] = new Option("六盘水","127"); 
	wane_searchl[8][6] = new Option("铜仁","128"); 
	wane_searchl[8][7] = new Option("兴义","129"); 
	wane_searchl[8][8] = new Option("玉屏","130"); 
	wane_searchl[8][9] = new Option("遵义","131"); 
	wane_searchl[9][0] = new Option("海口","132"); 
	wane_searchl[9][1] = new Option("儋县","133"); 
	wane_searchl[9][2] = new Option("陵水","134"); 
	wane_searchl[9][3] = new Option("琼海","135"); 
	wane_searchl[9][4] = new Option("三亚","136"); 
	wane_searchl[9][5] = new Option("通什","137"); 
	wane_searchl[9][6] = new Option("万宁","138"); 
	wane_searchl[10][0] = new Option("石家庄","139"); 
	wane_searchl[10][1] = new Option("保定","140"); 
	wane_searchl[10][2] = new Option("北戴河","141"); 
	wane_searchl[10][3] = new Option("沧州","142"); 
	wane_searchl[10][4] = new Option("承德","143"); 
	wane_searchl[10][5] = new Option("丰润","144"); 
	wane_searchl[10][6] = new Option("邯郸","145"); 
	wane_searchl[10][7] = new Option("衡水","146"); 
	wane_searchl[10][8] = new Option("廊坊","147"); 
	wane_searchl[10][9] = new Option("南戴河","148"); 
	wane_searchl[10][10] = new Option("秦皇岛","149"); 
	wane_searchl[10][11] = new Option("唐山","150"); 
	wane_searchl[10][12] = new Option("新城","151"); 
	wane_searchl[10][13] = new Option("邢台","152"); 
	wane_searchl[10][14] = new Option("张家口","153"); 
	wane_searchl[11][0] = new Option("郑州","154"); 
	wane_searchl[11][1] = new Option("安阳","155"); 
	wane_searchl[11][2] = new Option("鹤壁","156"); 
	wane_searchl[11][3] = new Option("潢川","157"); 
	wane_searchl[11][4] = new Option("焦作","158"); 
	wane_searchl[11][5] = new Option("开封","159"); 
	wane_searchl[11][6] = new Option("漯河","160"); 
	wane_searchl[11][7] = new Option("洛阳","161"); 
	wane_searchl[11][8] = new Option("南阳","162"); 
	wane_searchl[11][9] = new Option("平顶山","163"); 
	wane_searchl[11][10] = new Option("濮阳","164"); 
	wane_searchl[11][11] = new Option("三门峡","165"); 
	wane_searchl[11][12] = new Option("商丘","166"); 
	wane_searchl[11][13] = new Option("新乡","167"); 
	wane_searchl[11][14] = new Option("信阳","168"); 
	wane_searchl[11][15] = new Option("许昌","169"); 
	wane_searchl[11][16] = new Option("周口","170"); 
	wane_searchl[11][17] = new Option("驻马店","171"); 
	wane_searchl[12][0] = new Option("哈尔滨","172"); 
	wane_searchl[12][1] = new Option("北安","173"); 
	wane_searchl[12][2] = new Option("大庆","174"); 
	wane_searchl[12][3] = new Option("大兴安岭","175"); 
	wane_searchl[12][4] = new Option("鹤岗","176"); 
	wane_searchl[12][5] = new Option("黑河","177"); 
	wane_searchl[12][6] = new Option("佳木斯","178"); 
	wane_searchl[12][7] = new Option("鸡西","179"); 
	wane_searchl[12][8] = new Option("牡丹江","180"); 
	wane_searchl[12][9] = new Option("齐齐哈尔","181"); 
	wane_searchl[12][10] = new Option("七台河","182"); 
	wane_searchl[12][11] = new Option("双鸭山","183"); 
	wane_searchl[12][12] = new Option("绥化","184"); 
	wane_searchl[12][13] = new Option("伊春","185"); 
	wane_searchl[13][0] = new Option("武汉","186"); 
	wane_searchl[13][1] = new Option("恩施","187"); 
	wane_searchl[13][2] = new Option("鄂州","188"); 
	wane_searchl[13][3] = new Option("黄岗","189"); 
	wane_searchl[13][4] = new Option("黄石","190"); 
	wane_searchl[13][5] = new Option("荆门","191"); 
	wane_searchl[13][6] = new Option("荆州","192"); 
	wane_searchl[13][7] = new Option("潜江","193"); 
	wane_searchl[13][8] = new Option("十堰","194"); 
	wane_searchl[13][9] = new Option("随州","195"); 
	wane_searchl[13][10] = new Option("武穴","196"); 
	wane_searchl[13][11] = new Option("仙桃","197"); 
	wane_searchl[13][12] = new Option("咸宁","198"); 
	wane_searchl[13][13] = new Option("襄阳","199"); 
	wane_searchl[13][14] = new Option("襄樊","200"); 
	wane_searchl[13][15] = new Option("孝感","201"); 
	wane_searchl[13][16] = new Option("宜昌","202"); 
	wane_searchl[14][0] = new Option("长沙","203"); 
	wane_searchl[14][1] = new Option("常德","204"); 
	wane_searchl[14][2] = new Option("郴州","205"); 
	wane_searchl[14][3] = new Option("衡阳","206"); 
	wane_searchl[14][4] = new Option("怀化","207"); 
	wane_searchl[14][5] = new Option("吉首","208"); 
	wane_searchl[14][6] = new Option("娄底","209"); 
	wane_searchl[14][7] = new Option("邵阳","210"); 
	wane_searchl[14][8] = new Option("湘潭","211"); 
	wane_searchl[14][9] = new Option("益阳","212"); 
	wane_searchl[14][10] = new Option("岳阳","213"); 
	wane_searchl[14][11] = new Option("永州","214"); 
	wane_searchl[14][12] = new Option("张家界","215"); 
	wane_searchl[14][13] = new Option("株洲","216"); 
	wane_searchl[15][0] = new Option("南京","217"); 
	wane_searchl[15][1] = new Option("常熟","218"); 
	wane_searchl[15][2] = new Option("常州","219"); 
	wane_searchl[15][3] = new Option("海门","220"); 
	wane_searchl[15][4] = new Option("淮阴","221"); 
	wane_searchl[15][5] = new Option("江都","222"); 
	wane_searchl[15][6] = new Option("江阴","223"); 
	wane_searchl[15][7] = new Option("昆山","224"); 
	wane_searchl[15][8] = new Option("连云港","225"); 
	wane_searchl[15][9] = new Option("南通","226"); 
	wane_searchl[15][10] = new Option("启东","227"); 
	wane_searchl[15][11] = new Option("沭阳","228"); 
	wane_searchl[15][12] = new Option("苏州","229"); 
	wane_searchl[15][13] = new Option("太仓","230"); 
	wane_searchl[15][14] = new Option("泰州","231"); 
	wane_searchl[15][15] = new Option("同里","232"); 
	wane_searchl[15][16] = new Option("无锡","233"); 
	wane_searchl[15][17] = new Option("徐州","234"); 
	wane_searchl[15][18] = new Option("盐城","235"); 
	wane_searchl[15][19] = new Option("扬州","236"); 
	wane_searchl[15][20] = new Option("宜兴","237"); 
	wane_searchl[15][21] = new Option("仪征","238"); 
	wane_searchl[15][22] = new Option("张家港","239"); 
	wane_searchl[15][23] = new Option("镇江","240"); 
	wane_searchl[15][24] = new Option("周庄","241"); 
	wane_searchl[16][0] = new Option("南昌","242"); 
	wane_searchl[16][1] = new Option("抚州","243"); 
	wane_searchl[16][2] = new Option("赣州","244"); 
	wane_searchl[16][3] = new Option("吉安","245"); 
	wane_searchl[16][4] = new Option("景德镇","246"); 
	wane_searchl[16][5] = new Option("井冈山","247"); 
	wane_searchl[16][6] = new Option("九江","248"); 
	wane_searchl[16][7] = new Option("庐山","249"); 
	wane_searchl[16][8] = new Option("萍乡","250"); 
	wane_searchl[16][9] = new Option("上饶","251"); 
	wane_searchl[16][10] = new Option("新余","252"); 
	wane_searchl[16][11] = new Option("宜春","253"); 
	wane_searchl[16][12] = new Option("鹰潭","254"); 
	wane_searchl[17][0] = new Option("长春","255"); 
	wane_searchl[17][1] = new Option("白城","256"); 
	wane_searchl[17][2] = new Option("白山","257"); 
	wane_searchl[17][3] = new Option("珲春","258"); 
	wane_searchl[17][4] = new Option("辽源","259"); 
	wane_searchl[17][5] = new Option("梅河","260"); 
	wane_searchl[17][6] = new Option("吉林","261"); 
	wane_searchl[17][7] = new Option("四平","262"); 
	wane_searchl[17][8] = new Option("松原","263"); 
	wane_searchl[17][9] = new Option("通化","264"); 
	wane_searchl[17][10] = new Option("延吉","265"); 
	wane_searchl[18][0] = new Option("沈阳","266"); 
	wane_searchl[18][1] = new Option("鞍山","267"); 
	wane_searchl[18][2] = new Option("本溪","268"); 
	wane_searchl[18][3] = new Option("朝阳","269"); 
	wane_searchl[18][4] = new Option("大连","270"); 
	wane_searchl[18][5] = new Option("丹东","271"); 
	wane_searchl[18][6] = new Option("抚顺","272"); 
	wane_searchl[18][7] = new Option("阜新","273"); 
	wane_searchl[18][8] = new Option("葫芦岛","274"); 
	wane_searchl[18][9] = new Option("锦州","275"); 
	wane_searchl[18][10] = new Option("辽阳","276"); 
	wane_searchl[18][11] = new Option("盘锦","277"); 
	wane_searchl[18][12] = new Option("铁岭","278"); 
	wane_searchl[18][13] = new Option("营口","279"); 
	wane_searchl[19][0] = new Option("呼和浩特","280"); 
	wane_searchl[19][1] = new Option("阿拉善盟","281"); 
	wane_searchl[19][2] = new Option("包头","282"); 
	wane_searchl[19][3] = new Option("赤峰","283"); 
	wane_searchl[19][4] = new Option("东胜","284"); 
	wane_searchl[19][5] = new Option("海拉尔","285"); 
	wane_searchl[19][6] = new Option("集宁","286"); 
	wane_searchl[19][7] = new Option("临河","287"); 
	wane_searchl[19][8] = new Option("通辽","288"); 
	wane_searchl[19][9] = new Option("乌海","289"); 
	wane_searchl[19][10] = new Option("乌兰浩特","290"); 
	wane_searchl[19][11] = new Option("锡林浩特","291"); 
	wane_searchl[20][0] = new Option("银川","292"); 
	wane_searchl[20][1] = new Option("固源","293"); 
	wane_searchl[20][2] = new Option("石嘴山","294"); 
	wane_searchl[20][3] = new Option("吴忠","295"); 
	wane_searchl[21][0] = new Option("西宁","296"); 
	wane_searchl[21][1] = new Option("德令哈","297"); 
	wane_searchl[21][2] = new Option("格尔木","298"); 
	wane_searchl[21][3] = new Option("共和","299"); 
	wane_searchl[21][4] = new Option("海东","300"); 
	wane_searchl[21][5] = new Option("海晏","301"); 
	wane_searchl[21][6] = new Option("玛沁","302"); 
	wane_searchl[21][7] = new Option("同仁","303"); 
	wane_searchl[21][8] = new Option("玉树","304"); 
	wane_searchl[22][0] = new Option("青岛","305"); 
	wane_searchl[22][1] = new Option("济南","306"); 
	wane_searchl[22][2] = new Option("滨州","307"); 
	wane_searchl[22][3] = new Option("兖州","308"); 
	wane_searchl[22][4] = new Option("德州","309"); 
	wane_searchl[22][5] = new Option("东营","310"); 
	wane_searchl[22][6] = new Option("荷泽","311"); 
	wane_searchl[22][7] = new Option("济宁","312"); 
	wane_searchl[22][8] = new Option("莱芜","313"); 
	wane_searchl[22][9] = new Option("聊城","314"); 
	wane_searchl[22][10] = new Option("临沂","315"); 
	wane_searchl[22][11] = new Option("蓬莱","316"); 
	wane_searchl[22][12] = new Option("曲阜","317"); 
	wane_searchl[22][13] = new Option("日照","318"); 
	wane_searchl[22][14] = new Option("泰安","319"); 
	wane_searchl[22][15] = new Option("潍坊","320"); 
	wane_searchl[22][16] = new Option("威海","321"); 
	wane_searchl[22][17] = new Option("烟台","322"); 
	wane_searchl[22][18] = new Option("枣庄","323"); 
	wane_searchl[22][19] = new Option("淄博","324"); 
	wane_searchl[23][0] = new Option("太原","325"); 
	wane_searchl[23][1] = new Option("长治","326"); 
	wane_searchl[23][2] = new Option("大同","327"); 
	wane_searchl[23][3] = new Option("候马","328"); 
	wane_searchl[23][4] = new Option("晋城","329"); 
	wane_searchl[23][5] = new Option("离石","330"); 
	wane_searchl[23][6] = new Option("临汾","331"); 
	wane_searchl[23][7] = new Option("宁武","332"); 
	wane_searchl[23][8] = new Option("朔州","333"); 
	wane_searchl[23][9] = new Option("忻州","334"); 
	wane_searchl[23][10] = new Option("阳泉","335"); 
	wane_searchl[23][11] = new Option("榆次","336"); 
	wane_searchl[23][12] = new Option("运城","337"); 
	wane_searchl[24][0] = new Option("西安","338"); 
	wane_searchl[24][1] = new Option("安康","339"); 
	wane_searchl[24][2] = new Option("宝鸡","340"); 
	wane_searchl[24][3] = new Option("汉中","341"); 
	wane_searchl[24][4] = new Option("渭南","342"); 
	wane_searchl[24][5] = new Option("商州","343"); 
	wane_searchl[24][6] = new Option("绥德","344"); 
	wane_searchl[24][7] = new Option("铜川","345"); 
	wane_searchl[24][8] = new Option("咸阳","346"); 
	wane_searchl[24][9] = new Option("延安","347"); 
	wane_searchl[24][10] = new Option("榆林","348"); 
	wane_searchl[25][0] = new Option("上海","349"); 
	wane_searchl[26][0] = new Option("成都","352"); 
	wane_searchl[26][1] = new Option("巴中","353"); 
	wane_searchl[26][2] = new Option("达安","354"); 
	wane_searchl[26][3] = new Option("德阳","355"); 
	wane_searchl[26][4] = new Option("都江堰","356"); 
	wane_searchl[26][5] = new Option("峨眉山","357"); 
	wane_searchl[26][6] = new Option("涪陵","358"); 
	wane_searchl[26][7] = new Option("广安","359"); 
	wane_searchl[26][8] = new Option("广元","360"); 
	wane_searchl[26][9] = new Option("九寨沟","361"); 
	wane_searchl[26][10] = new Option("康定","362"); 
	wane_searchl[26][11] = new Option("乐山","363"); 
	wane_searchl[26][12] = new Option("泸州","364"); 
	wane_searchl[26][13] = new Option("马尔康","365"); 
	wane_searchl[26][14] = new Option("绵阳","366"); 
	wane_searchl[26][15] = new Option("南充","367"); 
	wane_searchl[26][16] = new Option("内江","368"); 
	wane_searchl[26][17] = new Option("攀枝花","369"); 
	wane_searchl[26][18] = new Option("遂宁","370"); 
	wane_searchl[26][19] = new Option("汶川","371"); 
	wane_searchl[26][20] = new Option("西昌","372"); 
	wane_searchl[26][21] = new Option("雅安","373"); 
	wane_searchl[26][22] = new Option("宜宾","374"); 
	wane_searchl[26][23] = new Option("自贡","375"); 
	wane_searchl[27][0] = new Option("天津","376"); 
	wane_searchl[28][0] = new Option("拉萨","377"); 
	wane_searchl[28][1] = new Option("阿里","378"); 
	wane_searchl[28][2] = new Option("昌都","379"); 
	wane_searchl[28][3] = new Option("林芝","380"); 
	wane_searchl[28][4] = new Option("那曲","381"); 
	wane_searchl[28][5] = new Option("日喀则","382"); 
	wane_searchl[28][6] = new Option("山南","383"); 
	wane_searchl[29][0] = new Option("乌鲁木齐","384"); 
	wane_searchl[29][1] = new Option("阿克苏","385"); 
	wane_searchl[29][2] = new Option("阿勒泰","386"); 
	wane_searchl[29][3] = new Option("阿图什","387"); 
	wane_searchl[29][4] = new Option("博乐","388"); 
	wane_searchl[29][5] = new Option("昌吉","389"); 
	wane_searchl[29][6] = new Option("东山","390"); 
	wane_searchl[29][7] = new Option("哈密","391"); 
	wane_searchl[29][8] = new Option("和田","392"); 
	wane_searchl[29][9] = new Option("喀什","393"); 
	wane_searchl[29][10] = new Option("克拉玛依","394"); 
	wane_searchl[29][11] = new Option("库车","395"); 
	wane_searchl[29][12] = new Option("库尔勒","396"); 
	wane_searchl[29][13] = new Option("奎屯","397"); 
	wane_searchl[29][14] = new Option("石河子","398"); 
	wane_searchl[29][15] = new Option("塔城","399"); 
	wane_searchl[29][16] = new Option("吐鲁番","400"); 
	wane_searchl[29][17] = new Option("伊宁","401"); 
	wane_searchl[30][0] = new Option("昆明","402"); 
	wane_searchl[30][1] = new Option("大理","403"); 
	wane_searchl[30][2] = new Option("保山","404"); 
	wane_searchl[30][3] = new Option("楚雄","405"); 
	wane_searchl[30][4] = new Option("东川","407"); 
	wane_searchl[30][5] = new Option("个旧","408"); 
	wane_searchl[30][6] = new Option("景洪","409"); 
	wane_searchl[30][7] = new Option("开远","410"); 
	wane_searchl[30][8] = new Option("临沧","411"); 
	wane_searchl[30][9] = new Option("丽江","412"); 
	wane_searchl[30][10] = new Option("六库","413"); 
	wane_searchl[30][11] = new Option("潞西","414"); 
	wane_searchl[30][12] = new Option("曲靖","415"); 
	wane_searchl[30][13] = new Option("思茅","416"); 
	wane_searchl[30][14] = new Option("文山","417"); 
	wane_searchl[30][15] = new Option("西双版纳","418"); 
	wane_searchl[30][16] = new Option("玉溪","419"); 
	wane_searchl[30][17] = new Option("中甸","420"); 
	wane_searchl[30][18] = new Option("昭通","421"); 
	wane_searchl[31][0] = new Option("杭州","422"); 
	wane_searchl[31][1] = new Option("安吉","423"); 
	wane_searchl[31][2] = new Option("慈溪","424"); 
	wane_searchl[31][3] = new Option("定海","425"); 
	wane_searchl[31][4] = new Option("奉化","426"); 
	wane_searchl[31][5] = new Option("海盐","427"); 
	wane_searchl[31][6] = new Option("黄岩","428"); 
	wane_searchl[31][7] = new Option("湖州","429"); 
	wane_searchl[31][8] = new Option("嘉兴","430"); 
	wane_searchl[31][9] = new Option("金华","431"); 
	wane_searchl[31][10] = new Option("临安","432"); 
	wane_searchl[31][11] = new Option("临海","433"); 
	wane_searchl[31][12] = new Option("丽水","434"); 
	wane_searchl[31][13] = new Option("宁波","435"); 
	wane_searchl[31][14] = new Option("瓯海","436"); 
	wane_searchl[31][15] = new Option("平湖","437"); 
	wane_searchl[31][16] = new Option("千岛湖","438"); 
	wane_searchl[31][17] = new Option("衢州","439"); 
	wane_searchl[31][18] = new Option("瑞安","440"); 
	wane_searchl[31][19] = new Option("绍兴","441"); 
	wane_searchl[31][20] = new Option("嵊州","442"); 
	wane_searchl[31][21] = new Option("台州","443"); 
	wane_searchl[31][22] = new Option("温岭","444"); 
	wane_searchl[31][23] = new Option("温州","445"); 
	wane_searchl[32][0] = new Option("香港","446"); 
	wane_searchl[32][1] = new Option("九龙","447"); 
	wane_searchl[33][0] = new Option("澳门","448"); 
	wane_searchl[34][0] = new Option("台北","449"); 
	wane_searchl[34][1] = new Option("基隆","450"); 
	wane_searchl[34][2] = new Option("台南","451"); 
	wane_searchl[34][3] = new Option("台中","452"); 
	wane_searchl[35][0] = new Option("美国","453"); 
	wane_searchl[35][1] = new Option("英国","454"); 
	wane_searchl[35][2] = new Option("德国","455"); 
	wane_searchl[35][3] = new Option("法国","456"); 
	    for(m=place_a.options.length-1;m>0;m--)
    //这个要看清楚,因为要重新填充下拉列表的话必须先清除里面原有的项,清除和增加当然是有区别的了,所以用递减
        place_a.options[m]=null;//将该项设置为空,也就等于清除了
    for(j=0;j<wane_searchl[x].length;j++){//这个循环是填充下拉列表
        place_a.options[j]=new Option(wane_searchl[x][j].text,wane_searchl[x][j].value)
        //注意上面这据,列表的当前项等于 新项(数组对象的x,j项的文本为文本，)
    }
    place_a.options[0].selected=true;//设置被选中的初始值
}
</script>
</head>
<body>
<form id="form20" name="wane_search" method="post" action="">
  <select name="one" size="1" onchange="makeplace_a(options.selectedIndex)">
  <option value="">---请选择省份---</option>
  <option value=1>安徽</option> 
	<option value=2>北京</option> 
	<option value=3>重庆</option> 
	<option value=4>福建</option> 
	<option value=5>甘肃</option> 
	<option value=6>广东</option> 
	<option value=7>广西</option> 
	<option value=8>贵州</option> 
	<option value=9>海南</option> 
	<option value=10>河北</option> 
	<option value=11>河南</option> 
	<option value=12>黑龙江</option> 
	<option value=13>湖北</option> 
	<option value=14>湖南</option> 
	<option value=15>江苏</option> 
	<option value=16>江西</option> 
	<option value=17>吉林</option> 
	<option value=18>辽宁</option> 
	<option value=19>内蒙</option> 
	<option value=20>宁夏</option> 
	<option value=21>青海</option> 
	<option value=22>山东</option> 
	<option value=23>山西</option> 
	<option value=24>陕西</option> 
	<option value=25>上海</option> 
	<option value=26>四川</option> 
	<option value=27>天津</option> 
	<option value=28>西藏</option> 
	<option value=29>新疆</option> 
	<option value=30>云南</option> 
	<option value=31>浙江</option> 
	<option value=32>香港</option> 
	<option value=33>澳门</option> 
	<option value=34>台湾</option> 
	<option value=35>国外</option> 
	   
  </select>
  <select name="place_a">
  <option value="">---请选择城市---</option>
    
  </select>
  <label>
  <input type="submit" name="Submit" value="提交">
  </label>
</form>
</body>
</html>

提示：您可以先修改部分代码再运行

js省市联动菜单效果

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