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什么是bootstrap？
Bootstrap，来自 Twitter，是目前最受欢迎的前端框架。Bootstrap 是基于 HTML、CSS、JAVASCRIPT 的，它简洁灵活，使得 Web 开发更加快捷。
本教程将向您讲解 Bootstrap 框架的基础，通过学习这些内容，您将可以轻松地创建 Web 项目。教程被分为 Bootstrap 基本结构、Bootstrap CSS、Bootstrap 布局组件和 Bootstrap 插件几个部分。每个部分都包含了与该主题相关的简单有用的实例。
阅读本篇文章需要什么基础？
只要您具备 HTML 和 CSS 的基础知识，您就可以阅读本教程，进而开发出自己的网站。在您学习完本教程后，您即可达到使用 Bootstrap 开发 Web 项目的中等水平。
学习bootstrap必读：www.bootcss.com/
今天学习了一下Bootstrap框架，，写一个小实例练练手，感受一下bootstrap兼容三端的强大。
<!doctype html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
<title>Bootstrap 101 Template</title>
<!-- Bootstrap -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
<!-- HTML5 shim 和 Respond.js 是为了让 IE8 支持 HTML5 元素和媒体查询（media queries）功能 -->
<!-- 警告：通过 file:// 协议（就是直接将 html 页面拖拽到浏览器中）访问页面时 Respond.js 不起作用 -->
<!--[if lt IE 9]>
<script src="https://cdn.jsdelivr.net/npm/html5shiv@3.7.3/dist/html5shiv.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/respond.js@1.4.2/dest/respond.min.js"></script>
<![endif]-->
<style type="text/css">
img{
width:100%;
}
.my1{
margin-top: 50px;
height: 500px;
overflow: hidden;
}
.my2 img{
width: auto;
}
.my3{
margin-top: 50px;
}
.my4{
margin: 50px auto;
}
.my4 > hr{
border: 1px solid antiquewhite;
}
</style>
</head>
<body>
<!-- 导航 -->
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">现代浏览器博物馆</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li class="active"><a href="#">综述 <span class="sr-only">(current)</span></a></li>
<li><a href="#">简述</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">特点 <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Chrome</a></li>
<li><a href="#">Firefox</a></li>
<li><a href="#">Safari</a></li>
<li><a href="#">Opera</a></li>
<li><a href="#">IE</a></li>
</ul>
</li>
<li>
<a href="javascript:;" data-toggle="modal" data-target="#myModal">
关于
</a>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
<!-- 轮播 -->
<div id="carousel-example-generic" class="carousel slide my1" data-ride="carousel" data-interval="2000">
<!-- Indicators -->
<ol class="carousel-indicators">
<li data-target="#carousel-example-generic" data-slide-to="0" class="active"></li>
<li data-target="#carousel-example-generic" data-slide-to="1"></li>
<li data-target="#carousel-example-generic" data-slide-to="2"></li>
<li data-target="#carousel-example-generic" data-slide-to="3"></li>
<li data-target="#carousel-example-generic" data-slide-to="4"></li>
</ol>
<!-- Wrapper for slides -->
<div class="carousel-inner" role="listbox">
<div class="item active">
<img src="images/chrome-big.jpg" alt="...">
<div class="carousel-caption">
</div>
</div>
<div class="item">
<img src="images/firefox-big.jpg" alt="...">
<div class="carousel-caption">
</div>
</div><div class="item">
<img src="images/ie-big.jpg" alt="...">
<div class="carousel-caption">
</div>
</div><div class="item">
<img src="images/opera-big.jpg" alt="...">
<div class="carousel-caption">
</div>
</div><div class="item">
<img src="images/safari-big.jpg" alt="...">
<div class="carousel-caption">
</div>
</div>
...
</div>
<!-- Controls -->
<a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev">
<span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</a>
<a class="right carousel-control" href="#carousel-example-generic" role="button" data-slide="next">
<span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</a>
</div>
<!-- 三列布局 -->
<div class="container my3">
<div class="row">
<div class="col-md-4 my2 text-center">
<img src="images/chrome-logo-small.jpg" alt="...">
<div class="caption">
<h3>chrome</h3>
<p>...</p>
<p><a href="#" class="btn btn-default" role="button">点我下载</a></p>
</div>
</div>
<div class="col-md-4 my2 text-center">
<img src="images/firefox-logo-small.jpg" alt="...">
<div class="caption">
<h3>firefox</h3>
<p>...</p>
<p><a href="#" class="btn btn-default" role="button">点我下载</a></p>
</div>
</div>
<div class="col-md-4 my2 text-center" >
<img src="images/safari-logo-small.jpg" alt="...">
<div class="caption">
<h3>safari</h3>
<p>...</p>
<p><a href="#" class="btn btn-default" role="button">点我下载</a></p>
</div>
</div>
</div>
</div>
<!-- 线 -->
<div class="container my4">
<hr >
</div>
<!-- 标签页 -->
<div class="container">
<!-- Nav tabs -->
<ul class="nav nav-tabs" role="tablist">
<li role="presentation" class="active"><a href="#chrome" aria-controls="chrome" role="tab" data-toggle="tab">chrome</a></li>
<li role="presentation"><a href="#firefox" aria-controls="firefox" role="tab" data-toggle="tab">firefox</a></li>
<li role="presentation"><a href="#ie" aria-controls="ie" role="tab" data-toggle="tab">ie</a></li>
<li role="presentation"><a href="#opera" aria-controls="opera" role="tab" data-toggle="tab">opera</a></li>
<li role="presentation"><a href="#safari" aria-controls="safari" role="tab" data-toggle="tab">safari</a></li>
</ul>
<!-- Tab panes -->
<div class="tab-content">
<div role="tabpanel" class="tab-pane active" id="chrome">
<div class="container-fluid">
<div class="row">
<div class="col-md-7">
<h3>chrome你懂的</h3>
</div>
<div class="col-md-5">
<img src="images/chrome-logo.jpg" >
</div>
</div>
</div>
</div>
<div role="tabpanel" class="tab-pane" id="firefox">
<div class="container-fluid">
<div class="row">
<div class="col-md-7">
<h3>firefox你懂的</h3>
</div>
<div class="col-md-5">
<img src="images/firefox-logo.jpg" >
</div>
</div>
</div>
</div>
<div role="tabpanel" class="tab-pane" id="ie">
<div class="container-fluid">
<div class="row">
<div class="col-md-7">
<h3>ie你懂的</h3>
</div>
<div class="col-md-5">
<img src="images/ie-logo.jpg" >
</div>
</div>
</div>
</div>
<div role="tabpanel" class="tab-pane" id="opera">
<div class="container-fluid">
<div class="row">
<div class="col-md-7">
<h3>opera你懂的</h3>
</div>
<div class="col-md-5">
<img src="images/opera-logo.jpg" >
</div>
</div>
</div>
</div>
<div role="tabpanel" class="tab-pane" id="safari">
<div class="container-fluid">
<div class="row">
<div class="col-md-7">
<h3>safari你懂的</h3>
</div>
<div class="col-md-5">
<img src="images/safari-logo.jpg" >
</div>
</div>
</div>
</div>
</div>
</div>
<!-- 版权 -->
<div class="container">
©玉面大蛟龙
</div>
<!-- 模态框 -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button>
<h4 class="modal-title" id="myModalLabel">Modal title</h4>
</div>
<div class="modal-body">
...
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
<!-- jQuery (Bootstrap 的所有 JavaScript 插件都依赖 jQuery，所以必须放在前边) -->
<script src="https://cdn.jsdelivr.net/npm/jquery@1.12.4/dist/jquery.min.js" integrity="sha384-nvAa0+6Qg9clwYCGGPpDQLVpLNn0fRaROjHqs13t4Ggj3Ez50XnGQqc/r8MhnRDZ" crossorigin="anonymous"></script>
<!-- 加载 Bootstrap 的所有 JavaScript 插件。你也可以根据需要只加载单个插件。 -->
<script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstr
ap.min.js" integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous"></script>
</body>
</html>
虽然有两三百行代码，但是写起来也就二十分钟的事情，不得不说bootstrap真是又方便又强大！
看一下界面效果吧~~~~
设计得不咋好看，主要目的还是练习一下bootstrap的使用。
一个导航条，下面是一个轮播图，导航条是始终保持在顶部的。
下面是一个栅格，里面的文字就偷懒没写了~~~
整体看上去是这样：
再下面是一个标签页，做得也比较简洁
还有一些小功能，例如点击按钮会出现下拉框、模态框什么的，这里就不多记录了。
总之，以往纯CSS需要花费几天几夜的项目，使用bootstrap十几分钟就完成了。
学无止境，我们一直在路上。
