Bootstrap

CDN

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<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">

<!-- Optional theme -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css" integrity="sha384-fLW2N01lMqjakBkx3l/M9EahuwpSfeNvV63J5ezn3uZzapT0u7EYsXMjQV+0En5r" crossorigin="anonymous">

<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS" crossorigin="anonymous"></script>

Class

• container-fliud contain all HTML ele

• img-responsive img fit the size of screen

• text-center text center

  • text-primary 主色调

• btn button

  • btn-block fit the entire width of the parent element
  • btn-primary/info/danger 主要操作/信息/警告

• well 一块灰色背景区

  Fluid Grid

一句话解释：设置元素的相对（屏幕大小的）宽度

12-colume grid layout

• row 包含12列的一行

• col-md-# medium宽度的screen

• col-xs-# extra-small宽度的screen

Font Awesome

一句话解释：一个把icon当做字体一样看待的库

CDN

<script src="https://use.fontawesome.com/12f2cabcbf.js"></script>

举个🌰：一个比原始尺寸大两倍的相机

<i class="fa fa-camera-retro fa-2x"></i>