<!DOCTYPE html>
<html>
<head>
<title>Bootstrap实例</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css">
<script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script>
<script src="https://apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Block Level Buttons</h2>
<button type="button" class="btn btn-primary btn-block">Button 1</button>
<button type="button" class="btn btn-default btn-block">Button 2</button>
<h2>Large Block Level Buttons</h2>
<button type="button" class="btn btn-primary btn-lg btn-block">Button 1</button>
<button type="button" class="btn btn-default btn-lg btn-block">Button 2</button>
<h2>Small Block Level Buttons</h2>
<button type="button" class="btn btn-primary btn-sm btn-block">Button 1</button>
<button type="button" class="btn btn-default btn-sm btn-block">Button 2</button>
</div>
</body>
</html>