非常简单的二级联动js菜单 [收藏]

<TITLE>二级联动</TITLE>
<STYLE>
body { font-size: 11px; font-family: Verdana;background:#ececec;color:#666666;}
select { font-size: 11px; font-family: Verdana;vertical-align: middle;margin: 3px;background:#ececec;color:#666666;}
</STYLE>
<div id="tar"></div>
<SCRIPT LANGUAGE="JavaScript" DEFER>
var fMenu = ["上海","北京","广东","南京"]
var fValue = ["shanghai","beijing","guadong","nanjing"]
var sMenu = [["杨浦区","徐汇区","黄浦区","卢湾区"],["丰台区","宝定区"],["广州","深圳"],["雨花台"]]
var sValue = [["yp","xh","hp","lw"],["ft","bd"],["gz","sz"],["yht"]]

var oWhere = document.all.tar;
var ofMenu = document.createElement("<SELECT name='main'>");
var osMenu = document.createElement("<SELECT name='sub'>");
with(oWhere)appendChild(ofMenu),appendChild(osMenu);

createMainOptions();
createSubOptions(0);

ofMenu.onchange = function() {createSubOptions(this.selectedIndex);};

function createMainOptions() {
     for(var i=0;i<fMenu.length;i++)ofMenu.options[i] = new Option(fMenu[i],fValue[i]);
}
function createSubOptions(j) {
     with(osMenu) {
         length=0;
         for(var i=0;i<sMenu[j].length;i++)osMenu.options[i] = new Option(sMenu[j][i],sValue[j][i]);
     }
}
</SCRIPT>
<div style="background:#E7E3DE;text-align:right;font-family:'Arial';font-size:10px;margin-top:10px;"><a href="mailto:[e-mail]">mailto:cloudchen</a></div><div style="background:#666666;color:white;font-family:'Arial';font-size:10px;">2003.8.19</div>