BootStrap

1:下载网站:http://v3.bootcss.com/

2:下载：用于生产环境的BootStrap

3：`（1）加载 Bootstrap 的层叠样式表：`

`<link href="css/bootstrap.min.css" rel="stylesheet">`

`（2）.Jquery库，同时加载该库必须在加载bootstrap.min.js之前`

`<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>` `<script src="js/bootstrap.min.js"></script>`

 
<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>

    <!--1.加载 Bootstrap 的层叠样式表-->
    <link href="css/bootstrap.min.css" rel="stylesheet">

    <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
   
<!--[if lt IE 9]>
      <script src="https://cdn.bootcss.com/html5shiv/3.7.3/html5shiv.min.js"></script>
      <script src="https://cdn.bootcss.com/respond.js/1.4.2/respond.min.js"></script>
    <![endif]-->

  </head>
<body>
<h1>你好，世界！</h1>

    <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<2.Jquery库，同时加载该库必须在加载bootstrap.min.js之前>
    <script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
    <!-- Include all compiled plugins (below), or include individual files as needed -->
    <script src="js/bootstrap.min.js"></script>
  </body>