代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>float的瀑布流应用</title>
<style type="text/css">
*{
}
ul li img{
width: 240px;
height: 320px;
padding: 6px;
}
ul{
list-style: none;
width: 280px;
background-color: yellow;
float: left;
border: 1px solid purple;
margin: 0;
padding: 10px;
}
li{
border: 1px solid aquamarine;
margin: 0;
padding: 6px;
}
#div1{
width: auto;
height: auto;
margin:10px 200px;
}
</style>
</head>
<body>
<div id="div1">
<ul>
<li><img src="img/1.gif"></li>
<li><img src="img/2.gif"></li>
<li><img src="img/3.gif"></li>
</ul>
<ul>
<li><img src="img/4.gif"></li>
<li><img src="img/5.gif"></li>
<li><img src="img/6.gif"></li>
</ul>
<ul>
<li><img src="img/7.gif"></li>
<li><img src="img/8.gif"></li>
<li><img src="img/9.gif"></li>
</ul>
</div>
</body>
</html>