<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>下拉菜单</title>
<style type="text/css">
body,ul,li{ margin:0; padding:0; font-size:13px;}
ul,li{list-style:none;}
#divselect{width:186px; margin:80px auto; position:relative; z-index:10000;}
#divselect cite{width:150px; height:24px;line-height:24px; display:block; color:#807a62; cursor:pointer;font-style:normal;
padding-left:4px; padding-right:30px; border:1px solid #333333;
/*background:url(xjt.png) no-repeat right center;*/}
#divselect ul{width:184px;border:1px solid #333333; background-color:#ffffff; position:absolute; z-index:20000; margin-top:-1px; display:none;}
#divselect ul li{height:24px; line-height:24px;}
#divselect ul li a{display:block; height:24px; color:#333333; text-decoration:none; padding-left:10px; padding-right:10px;}
</style>
<script type="text/javascript">
window.onload=function(){
var box=document.getElementById('divselect'),
title=box.getElementsByTagName('cite')[0],
menu=box.getElementsByTagName('ul')[0],
as=box.getElementsByTagName('a'),
index=-1;
// 点击三角时
title.onclick=function(event){
event = event||window.event;
menu.style.display = 'block';
if(event.stopPropagation){
event.stopPropagation();
}else{
event.cancelBubble = true;
}
document.onkeyup = function(event){
event = event||window.event;
if(event.keyCode==40){
index++;
if(index>=as.length) index=0;
for(var i=0; i<as.length;i++){
as[i].style.background = '#fff';
}
as[index].style.background = '#ccc';
}
if(event.keyCode==38){
index--;
if(index<0) index=as.length-1;
for(var i=0; i<as.length;i++){
as[i].style.background = '#fff';
}
as[index].style.background = '#ccc';
}
if(event.keyCode==13){
for(var i=0; i<as.length;i++){
as[i].style.background = '#fff';
}
title.innerHTML = as[index].innerHTML;
menu.style.display = 'none';
}
}
}
// 滑过滑过、离开、点击每个选项时
for(var i=0; i<as.length; i++){
as[i].onmouseover = function(){
for(var i=0; i<as.length;i++){
as[i].style.background = '#fff';
}
this.style.background = '#ccc';
}
as[i].onmouseout = function(){
this.style.background = '#fff';
}
as[i].onclick = function(event){
event = event||window.event;
if(event.stopPropagation){
event.stopPropagation();
}else{
event.cancelBubble = true;
}
menu.style.display = 'none';
title.innerHTML = this.innerHTML;
}
}
// 点击页面空白处时
document.onclick = function(){
menu.style.display = 'none';
}
}
</script>
</head>
<body>
<div id="divselect">
<cite>请选择分类</cite>
<ul>
<li id="li"><a href="javascript:;" selectid="1">ASP开发</a></li>
<li><a href="javascript:;" selectid="2">.NET开发</a></li>
<li><a href="javascript:;" selectid="3">PHP开发</a></li>
<li><a href="javascript:;" selectid="4">Javascript开发</a></li>
<li><a href="javascript:;" selectid="5">Java特效</a></li>
</ul>
</div>
</body>
</html>我的想法是在mouseover的时候，先将所有选项背景包括键盘事件设置的背景色设为白色再执行鼠标事件指定位置的背景变色。不知道问题出在哪，或者有更好的方法去除两个阴影的bug问题，请大神帮忙解决一下~
qq_还不走