css浮动及清除浮动
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>浮动</title>
<style type="text/css">
ul li{list-style: none;width: 100px;height: 40px;text-align: center;line-height: 40px;background: #ccc;margin:5px 1px;float: left;}
.clear{clear:both}
</style>
</head>
<body>
<ul>
<li>html</li>
<li>css</li>
<li>javaScript</li>
<li>php</li>
<li>java</li>
<li>C++</li>
<li>C语音</li>
<div class="clear"></div>
</ul>
</body>
</html>