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js省市联动菜单效果

发布时间：2023-12-23 编辑：jiaochengji.com

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js省市联动菜单效果

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<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>

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