省级城市js联动菜单代码，这个是二级js联动菜单，选择前面的省份才可以选择后面的城市，可自己修改和添加选项。
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<title>省级二级js联动菜单_武鸣人</title>
<script language="javascript">
<!--
var onecount;
onecount=0;
subcat = new Array();
subcat[0] = new Array("徐汇区","01","001");
subcat[1] = new Array("嘉定区","01","002");
subcat[2] = new Array("黄浦区","01","003");
subcat[3] = new Array("南昌市","02","004");
subcat[4] = new Array("九江市","02","005");
subcat[5] = new Array("上饶市","02","006");
onecount=6;
function changelocation(locationid)
{//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
document.wuming_ren.smalllocation.length = 0;
var locationid=locationid;
var i;
document.wuming_ren.smalllocation.options[0] = new Option('====所有地区====','');
for (i=0;i < onecount; i++)
{
if (subcat[i][1] == locationid)
{
document.wuming_ren.smalllocation.options[document.wuming_ren.smalllocation.length] = new Option(subcat[i][0], subcat[i][2]);
}
}
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
//-->
</script>
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<body>
<a href="https://www.wuming.ren">武鸣人</a>，各种信息资源免费发布，分享励志语录经典短句，减肥健身常识，各种js特效代码。网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)<hr>
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<script type="text/javascript" src="https://www.wuming.ren/ad/tc.js"></script>
<script type="text/javascript" src="https://www.wuming.ren/ad/a.js"></script>
<form name="wuming_ren" method="post">
<select name="www_wuming_ren" onChange="changelocation(document.wuming_ren.www_wuming_ren.options[document.wuming_ren.www_wuming_ren.selectedIndex].value)">
<option value="01" selected>上海</option>
<option value="02">江西</option>
</select>
<select name="smalllocation">
<option selected value="">==所有地区==</option>
</select>
</form>
<script LANGUAGE="javascript">
<!--
changelocation(document.wuming_ren.www_wuming_ren.options[document.wuming_ren.www_wuming_ren.selectedIndex].value);
//-->
</script>
</body>
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