官网下载Bootstrap · The most popular HTML, CSS, and JS library in the world.

Bootstrap中文网

 最简DEMO--helloworld

<head>
   <meta name="viewport" content="width=device-width,initial-scale=1.0)>
    <link href="css/bootstrap.css" type="text/css" rel="stylesheet">
    <link href="css/bootstrap.min.css" type="text/css" rel="stylesheet">   

<head>
<body>
hello World!
<hr />

<button type="button" class="btn btn-warning">警告按钮</button>



<script src="js/bootstrap.min.js"></script>
<script src="js/bootstrap.bundle.min.js"></script>
</body>

image