什么是响应式Web设计？
- RWD指的是响应式Web设计（Responsive Web Design）
- RWD能够以可变尺寸传递网页
- RWD对于平板和移动设备是必需的。
创建您自己的响应式设计
创建响应式设计的一个方法，是自己来创建它：
<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
.city {
float: left;
margin: 5px;
padding: 15px;
width: 300px;
height: 300px;
border: 1px solid black;
}
</style>
</head>
<body>
<h1>W3School Demo</h1>
<h2>Resize this responsive page!</h2>
<br>
<div class="city">
<h2>London</h2>
<p>London is the capital city of England.</p>
<p>It is the most populous city in the United Kingdom,
with a metropolitan area of over 13 million inhabitants.</p>
</div>
<div class="city">
<h2>Paris</h2>
<p>Paris is the capital and most populous city of France.</p>
</div>
<div class="city">
<h2>Tokyo</h2>
<p>Tokyo is the capital of Japan, the center of the Greater Tokyo Area,
and the most populous metropolitan area in the world.</p>
</div>
</body>
</html>
使用Bootstrap
另一个创建响应式设计方法，是使用现成的CSS框架。
Bootstrap是最流行的开发响应式Web的HTML，CSS和JS框架。
Bootstrap帮助您在开发任何尺寸都外观出众的站点：显示器、笔记本电脑、平板电脑或手机：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet"
href="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<div class="jumbotron">
<h1>W3School Demo</h1>
<p>Resize this responsive page!</p>
</div>
</div>
<div class="container">
<div class="row">
<div class="col-md-4">
<h2>London</h2>
<p>London is the capital city of England.</p>
<p>It is the most populous city in the United Kingdom,
with a metropolitan area of over 13 million inhabitants.</p>
</div>
<div class="col-md-4">
<h2>Paris</h2>
<p>Paris is the capital and most populous city of France.</p>
</div>
<div class="col-md-4">
<h2>Tokyo</h2>
<p>Tokyo is the capital of Japan, the center of the Greater Tokyo Area,
and the most populous metropolitan area in the world.</p>
</div>
</div>
</div>
</body>
</html>
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