clear 属性规定元素的哪一侧不允许其他浮动元素。clear 属性定义了元素的哪边上不允许出现浮动元素。在 CSS1 和 CSS2 中，这是通过自动为清除元素（即设置了 clear 属性的元素）增加上外边距实现的。在 CSS2.1 中，会在元素上外边距之上增加清除空间，而外边距本身并不改变。不论哪一种改变，最终结果都一样，如果声明为左边或右边清除，会使元素的上外边框边界刚好在该边上浮动元素的下外边距边界之下。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>北国风光</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style type="text/css" media="screen, projection">
body {
line-height:1;
color:#333;
}
ol, ul, h1 {
margin:0;
padding:0;
list-style:none;
}
a {
color: #933;
text-decoration: none;
}
a:hover {
color: #DF3030;
}
nav h1 {
text-align:center;
}
nav h1 img {
width:90%;
}
nav ul {
border-top: 1px solid #999;
}
nav li {
text-align: center;
border-bottom:1px solid #ccc;
line-height:60px;
}
nav li a {
display:block;
}
nav li a:hover {
background-color:#e4e4e4;
}
section {
font-size:14px;
font-family:"宋体";
}
section h2 {
font-size:18px;
text-align:center;
font-family:"黑体";
font-weight:lighter;
}
section span {
padding:0 10px;
background-color:#FFF;
}
section li {
text-align:center;
}
section li img {
width:98%;
border-radius:5px;
}
section article {
border-top: 1px solid #999;
margin-top:20px;
padding-bottom:20px;
}
.clear {
clear:both;
line-height:5px;
}
footer {
clear:both;border-top: 1px solid #999;
font-size: 12px;
text-align: center;
padding: 10px 0;
font-family:Arial, Helvetica, sans-serif;
color:#666;
}
@media (max-width: 400px) {
nav li {
float:left;
width:32%;
margin-left:1%;
}
section {
clear:both;
padding:20px 0;
}
section li {
margin:10px 2px;
}
section li span {
display:block;
text-align:center;
font-size:12px;
}
}
@media (min-width:400px) and (max-width: 600px) {
nav li {
float:left;
width:32%;
margin-left:1%;
}
section {
clear:both;
padding:20px 0;
}
section li {
float:left;
margin:10px 2px;
width:48%;
}
section li span {
display:block;
text-align:center;
font-size:12px;
}
}
@media (min-width:600px) and (max-width:900px) {
nav {
float:left;
width:35%;
}
section {
float:left;
width: 65%;
padding:20px 0;
}
section li {
float:left;
margin:10px 2px;
width:48%;
}
section li span {
display:block;
text-align:center;
font-size:12px;
}
}
@media (min-width: 900px) {
nav h1 {
float:left;
width:35%;
height:200px;
}
nav ul {
float:left;
width: 65%;
}
nav li {
float:left;
width:32%;
margin-left:1%;
}
section {
float:left;
width: 65%;
padding:20px 0;
}
section li {
float:left;
margin:10px 2px;
width:32%;
}
section li span {
display:block;
text-align:center;
font-size:12px;
}
}
</style>
</head>
<body>
<!-- 包含logo的导航栏 -->
<nav>
<!-- logo -->
<h1 id="logo"><a href="#"><img src="images/logo.jpg" alt="北国风光"></a></h1>
<!-- 导航栏 -->
<ul>
<li><a href="#">名词来历</a></li>
<li><a href="#">北国雾凇</a></li>
<li><a href="#">风光图片集</a></li>
</ul>
</nav>
<section>
<!-- 图片列表 -->
<article>
<h2 style="margin-top:-15px;"><span>风光图片集</span></h2>
<ol>
<li> <a href="#"> <img src="images/Scene1.jpg" alt=""> <span>图片1</span> </a> </li>
<li> <a href="#"> <img src="images/Scene2.jpg" alt=""> <span>图片2</span> </a> </li>
<li> <a href="#"> <img src="images/Scene3.jpg" alt=""> <span>图片3</span> </a> </li>
<li> <a href="#"> <img src="images/Scene4.jpg" alt=""> <span>图片4</span> </a> </li>
<li> <a href="#"> <img src="images/Scene5.jpg" alt=""> <span>图片5</span> </a> </li>
<li> <a href="#"> <img src="images/Scene6.jpg" alt=""> <span>图片6</span> </a> </li>
</ol>
<div class="clear"></div>
</article>
<!-- 页面底部 -->
<footer> 北国风光© 2011</footer>
</section>
</body>
</html>
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