<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<script src="jQuery/jquery-1.7.2.min.js"></script>
<style type="text/css">
*
{
margin:0px;
height:0px;
}
.top_list
{
top:20px;
height:40px;
width:100px;
position:relative;
margin-left:10px;
float:left;
background-color:red;
overflow:hidden;
}
.down_list
{
top:40px;
height:200px;
width:100px;
position:relative;
background-color:green;
}
</style>
<script type="text/javascript">
$(document).ready(function () {
$(".top_list").hover(function () {
$(this).stop().animate({ height: "240" }, 500);
},
function () {
$(this).stop().animate({ height: "40" }, 500);
});
});
</script>
</head>
<body>
<div class="top_list">
<div class="down_list"></div>
</div>
<div class="top_list">
<div class="down_list"></div>
</div>
<div class="top_list">
<div class="down_list"></div>
</div>
<div class="top_list">
<div class="down_list"></div>
</div>
<div class="top_list">
<div class="down_list"></div>
</div>
<div class="top_list">
<div class="down_list"></div>
</div>
<div class="top_list">
<div class="down_list"></div>
</div>
<div class="top_list">
<div class="down_list"></div>
</div>
<div class="top_list">
<div class="down_list"></div>
</div>
<div class="top_list">
<div class="down_list"></div>
</div>
<div class="top_list">
<div class="down_list"></div>
</div>
</body>
原文：http://www.cnblogs.com/123lucy/p/5763840.html