Bootstrap介绍
Bootstrap是2011年8月由Twitter发布一款目前最受欢迎的前端框架。Bootstrap基于HTML、CSS、JAVASCRIPT的，它简洁灵活，将常见的CSS布局、常用组件和JavaScript插件进行了完整并完善的封装，能让没有经验的前端工程师和后端开发工程师都迅速掌握和使用，大大提高开发效率，它还在某种程度上规范前端团队编写CSS和JavaScript的规范。总之学习Bootstrap可以让你很轻松开发出响应式的WEB项目。
Bootstrap is the mostpopular HTML, CSS, and JS framework for developing responsive, mobile firstprojects on the web.
官网：getbootstrap.com(英文) bootcss.com(中文)
Bootstrap优点
适配所有设备 Designed for everyone,everywhere.
预处理脚本 less& sass preprocessors
响应式布局 One framework, every device.
特性齐全
完全开源：代码托管，开发、维护依赖于GitHub
使用：下载或者使用CDN提供的加速服务CDN服务
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<!-- Optional theme -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" crossorigin="anonymous">
<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
Bootstrap是依赖于jQuery的，所以一定要引入jQuery包。
入门例子创建
效果如图：
代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width; initial-scale=1;">
// 一定要申明此句。
<title>easyBootstrapTest</title>
<link rel="stylesheet" type="text/css" href="bootstrap.min.css">
<style>
body{padding-top: 50px;}
.starter{ padding: 40px 15px; text-align: center; }
</style>
</head>
<body>
<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
<div class="container">
<div class="navbar-header">
<a href="#" class="navbar-brand">Project Name</a>
</div>
<div id="navbar" class="colllapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">About</a></li>
<li><a href="#">Contact</a></li>
</ul>
</div>
</div>
</nav>
<div class="container">
<div class="starter">
<h1>Bootstrap starter template</h1>
<p>Welcome to Bootstrap. Welcome to Bootstrap.Welcome to Bootstrap.Welcome to Bootstrap.Welcome to Bootstrap.Welcome to Bootstrap.Welcome to Bootstrap.Welcome to Bootstrap.Welcome to Bootstrap.</p>
</div>
</div>
</body>
</html>