JS二级下拉菜单问题_问答-阿里云开发者社区

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <TITLE> New Document </TITLE> <META NAME="Generator" CONTENT="EditPlus"> <META NAME="Author" CONTENT=""> <META NAME="Keywords" CONTENT=""> <META NAME="Description" CONTENT=""> <script language="JavaScript" type="text/javascript"> //定义了城市的二维数组，里面的顺序跟省份的顺序是相同的。通过selectedIndex获得省份的下标值来得到相应的城市数组 var city=[ ["请选择","北京","天津","上海","重庆"], ["南京","苏州","南通","常州"], ["福州","福安","龙岩","南平"], ["广州","潮阳","潮州","澄海"], ["兰州","白银","定西","敦煌"] ]; function getCity(){ //获得省份下拉框的对象 var sltProvince=document.form1.province; //获得城市下拉框的对象 var sltCity=document.form1.city; //得到对应省份的城市数组 var provinceCity=city[sltProvince.selectedIndex - 1]; //清空城市下拉框，仅留提示选项 sltCity.length=1; //将城市数组中的值填充到城市下拉框中 for(var i=0;i<provinceCity.length;i++){ sltCity[i+1]=new Option(provinceCity[i],provinceCity[i]); } } </script> </HEAD> <BODY> <FORM METHOD=POST ACTION="" name="form1"> <SELECT NAME="province" onChange="getCity()"> <OPTION VALUE="0">请选择所在省份 </OPTION> <OPTION VALUE="直辖市">直辖市 </OPTION> <OPTION VALUE="江苏省">江苏省 </OPTION> <OPTION VALUE="福建省">福建省 </OPTION> <OPTION VALUE="广东省">广东省 </OPTION> <OPTION VALUE="甘肃省">甘肃省 </OPTION> </SELECT> <SELECT NAME="city"> </SELECT> </FORM> </BODY> </HTML>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<HTML>

<HEAD>

<TITLE> New Document </TITLE>

<META NAME="Generator" CONTENT="EditPlus">

<META NAME="Author" CONTENT="">

<META NAME="Keywords" CONTENT="">

<META NAME="Description" CONTENT="">

<script type="text/javascript">

//定义了城市的二维数组，里面的顺序跟省份的顺序是相同的。通过selectedIndex获得省份的下标值来得到相应的城市数组

     var city=[

["北京","天津","上海","重庆","香港","澳门"],

     ["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"],

     ["太原","大同","阳泉","长治","晋城","朔州","晋中","运城","忻州","临汾","吕梁"],

     ["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"],

     ["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"],

     ["长春","吉林","四平","辽源","通化","白山","松原","白城","延边"],

     ["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"],

     ["南京","苏州","扬州","无锡","徐州","常州","南通","连云港","淮安","盐城","镇江","泰州","宿迁"],

     ["杭州","宁波","温州","嘉兴","湖州","绍兴","金华","衢州","舟山","台州","丽水"],

     ["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"],

     ["福州","宁德","南平","厦门","莆田","三明","泉州","漳州"],

     ["南昌","上饶","萍乡","九江","景德镇","新余","鹰潭","赣州","吉安","宜春","抚州"],

     ["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"],

     ["郑州","开封","洛阳","平顶山","焦作","鹤壁","新乡","安阳","濮阳","漯河","许昌","三门峡","南阳","商丘","信阳","周口","驻马

店"],

     ["武汉","十堰","襄樊","鄂州","黄石","荆州","宜昌","荆门","孝感","黄冈","咸宁","随州","恩施"],

     ["长沙","株洲","湘潭","岳阳","邵阳","常德","衡阳","张家界","益阳","郴州","永州","怀化","娄底","湘西"],

     ["广州","清远","潮州","东莞","珠海","深圳","汕头","韶关","佛山","江门","湛江","茂名","肇庆","惠州","梅州","汕尾","阳江","河源

","中山","揭阳","云浮"],

     ["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"],

     ["海口","三亚"],

     ["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"],

     ["贵阳","六盘水","遵义","安顺","铜仁","毕节","黔西南","黔东南","黔南"],

     ["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"],

     ["拉萨","昌都","山南","日喀则","那曲","阿里","林芝"],

     ["西安","铜川","宝鸡","咸阳","渭南","延安","汉中","榆林","安康","商洛"],

     ["兰州","白银","定西","敦煌","嘉峪关","金昌","天水","武威","张掖","平凉","酒泉","庆阳","临夏","陇南","甘南"],

     ["西宁","海东","海北","黄南","海南","果洛","玉树","海西"],

     ["银川","石嘴山","吴忠","固原","中卫"],

     ["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","阿勒泰"],

     ["台北","高雄","基隆","台中","台南","新竹","嘉义"]

     ];

     function getCity(){

         //获得省份下拉框的对象

         var sltProvince=document.forms[0].province;

         //获得城市下拉框的对象

         var sltCity=document.forms[0].city;

         //得到对应省份的城市数组

         var provinceCity=city[sltProvince.selectedIndex - 1];

         //清空城市下拉框，仅留提示选项

         sltCity.length=1;

         //将城市数组中的值填充到城市下拉框中

         for(var i=0;i<provinceCity.length;i++){

             sltCity[i+1]=new Option(provinceCity[i],provinceCity[i]);

         }

     }

</script>

</HEAD>

<BODY>

<form name="f1">

<table>

   <tr><td>请选择企业所在城市<font color="red">*</font></td>

    <td><select name="province" onChange="getCity()">

       <option value="null" selected="selected">请选择所在省份</option>

        <option value="直辖市">直辖市</option>

        <option value="河北">河北</option>

        <option value="山西">山西</option>

          <option value="内蒙古">内蒙古</option>

            <option value="辽宁">辽宁</option>

          <option value="吉林">吉林</option>

          <option value="黑龙江">黑龙江</option>

          <option value="江苏">江苏</option>

          <option value="浙江">浙江</option>

          <option value="安徽">安徽 </option>

        <option value="福建">福建 </option>

          <option value="江西">江西</option>

            <option value="山东">山东</option>

          <option value="河南">河南</option>

          <option value="湖北">湖北</option>

          <option value="湖南">湖南</option>

          <option value="广东">广东</option> 

          <option value="广西">广西</option>

            <option value="海南">海南</option>

          <option value="四川">四川</option>

          <option value="贵州">贵州</option>

          <option value="云南">云南</option>

          <option value="西藏">西藏</option>

          <option value="陕西">陕西 </option>

        <option value="甘肃">甘肃 </option>

          <option value="青海">青海</option>

            <option value="宁夏">宁夏</option>

          <option value="新疆">新疆</option>

          <option value="台湾">台湾</option>   

         </select>

     <select name="city">

          <option selected="selected" value="null">请选择所在城市</option>

          </select></td></tr>

     </table></form>

</BODY>

</HTML>

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