<!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; width:600px;}.nav li { float: left; position:relative; height:30px; width:120px }.nav li a { display: block; height: 30px; text-align: center; line-height: 30px; width:120px; background: #efefef; margin-left: 1px; }.subNav{ position:absolute; top:30px; left:0; width: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 This=this; var ul =This.getElementsByTagName('ul')[0]; if(ul.className=="subNav"){ clearInterval(This.time); This.time=setInterval(function(){ ul.style.height=ul.offsetHeight+16+"px"; if(ul.offsetHeight>=120){ clearInterval(This.time); } },30) } } //鼠标离开菜单，二级菜单动画收缩起来。 aLi[i].onmouseout=function(){ var This=this; var ul=this.getElementsByTagName("ul")[0]; if(ul){ clearInterval(This.time); This.time=setInterval(function(){ ul.style.height=ul.offsetHeight-18+"px"; if(ul.offsetHeight<=0){ clearInterval(This.time); } },30) } } }}</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>
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