<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>动画菜单</title>
<style type="text/css">
* { margin: 0; padding: 0; font-size: 14px; }
a { color: #333; text-decoration: none }
ul{ list-style: none; }
.nav {height: 30px; border-bottom: 5px solid #F60; margin-left:50px; 600px;}
.nav li { float: left; position:relative; height:30px; 120px }
.nav li a { display: block; height: 30px; text-align: center; line-height: 30px; 120px; background: #efefef; margin-left: 1px; }
.subNav{ position:absolute; top:30px; left:0; 120px; height:0; overflow:hidden}
.subNav li a{ background:#ddd }
.subNav li a:hover{ background:#efefef}
</style>
<script>
window.onload=function(){
var aLi=document.getElementsByTagName('li');
for(var i=0; i<aLi.length; i++){
aLi[i].onmouseover=function(){
//鼠标经过一级菜单，二级菜单动画下拉显示出来
var ul=this.getElementsByTagName('ul')[0];
if(ul!=null){
startMove(ul,'height',120);
}
}
//鼠标离开菜单，二级菜单动画收缩起来。
aLi[i].onmouseout=function(){
var ul=this.getElementsByTagName('ul')[0];
if(ul!=null){
startMove(ul,'height',0);
}
}
}
}
function startMove(obj,attr,iTarget,fn){
clearInterval(obj.timer);
obj.timer=setInterval(function(){
//取当前值
var icur=0;
if(attr == 'opacity'){
icur=Math.round(parseFloat(getStyle(obj,attr))*100);
}else{
icur = parseInt(getStyle(obj,attr));
}
//算速度
var speed=(iTarget-icur)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);//防止因小数而导致不能完全收缩
//监测停止
if(icur == iTarget){
clearInterval(obj.timer);
if(fn){
fn();
}
}else{
if(attr == 'opacity'){//透明度
obj.style.filter='alpha(opactiy:'+(icur + speed)+')';//IE
obj.style.opacity=(icur + speed)/100;//火狐(透明度满值为1)
}else{
obj.style[attr]= icur +speed+'px'; //当前值加10
}
}
},30)
}
function getStyle(obj,attr){
if(obj.currentStyle){
return obj.currentStyle[attr];//IE
}else{
return getComputedStyle(obj,false)[attr];
}
}
</script>
</head>
<body>
<ul class="nav">
<li><a href="#">一级菜单</a>
<ul class="subNav">
<li><a href="#">二级菜单</a></li>
<li><a href="#">二级菜单</a></li>
<li><a href="#">二级菜单</a></li>
<li><a href="#">二级菜单</a></li>
</ul>
</li>
<li><a href="#">一级菜单</a>
<ul class="subNav">
<li><a href="#">二级菜单</a></li>
<li><a href="#">二级菜单</a></li>
<li><a href="#">二级菜单</a></li>
<li><a href="#">二级菜单</a></li>
</ul>
</li>
<li><a href="#">一级菜单</a></li>
<li><a href="#">一级菜单</a></li>
<li><a href="#">一级菜单</a></li>
</ul>
</body>
</html>