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源代码：
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<!DOCTYPE html> <html> <head> <title>Bootstrap 实例</title> <meta charset="utf-8"> <meta content="width=device-width, initial-scale=1" name="viewport"> <link href="//cdn.staticfile.net/twitter-bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet"> <script src="//cdn.staticfile.net/jquery/3.2.1/jquery.min.js"></script> <script src="//cdn.staticfile.net/popper.js/1.12.5/umd/popper.min.js"></script> <script src="//cdn.staticfile.net/twitter-bootstrap/4.0.0/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <h2>按钮样式</h2> <button class="btn" type="button">基本按钮</button> <button class="btn btn-primary" type="button">主要按钮</button> <button class="btn btn-secondary" type="button">次要按钮</button> <button class="btn btn-success" type="button">成功</button> <button class="btn btn-info" type="button">信息</button> <button class="btn btn-warning" type="button">警告</button> <button class="btn btn-danger" type="button">危险</button> <button class="btn btn-dark" type="button">黑色</button> <button class="btn btn-light" type="button">浅色</button> <button class="btn btn-link" type="button">链接</button> </div> </body> </html>
运行结果