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js-二级菜单.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</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;
margin-left: 50px;
width: 610px;
border: 1px solid red;
border-bottom: 5px solid #f60;
}
.nav li {
float: left;
position: relative;
height: 30px;
width: 120px;
border: 1px solid green;
}
.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: 0px;
width: 120px;
height: 0px;
border: 1px solid yellow;
overflow: hidden
}
.subNav li a {
background: #ded2e7;
}
.subNav li a:hover {
background: #f9700b;
}
</style>
<script type="text/javascript">
window.onload = function() {
var aLi = document.getElementsByTagName('li');
for (var i = 0; i < aLi.length; i++) {
aLi[i].onmouseover = function() {
var oSubNav = this.getElementsByTagName('ul')[0];
if (oSubNav) {
var This = oSubNav;
clearInterval(This.time);
This.time = setInterval(function() {
This.style.height = This.offsetHeight + 16 + "px";
if (This.offsetHeight >= 120) {
clearInterval(This.time);
}
}, 30)
}
}
aLi[i].onmouseout = function() {
var oSubNav = this.getElementsByTagName('ul')[0];
if (oSubNav) {
var This = oSubNav;
clearInterval(This.time);
This.time = setInterval(function() {
This.style.height = This.offsetHeight - 16 + "px";
if (This.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>