bootstrap4设置按钮代码：
实例：（推荐学习：Bootstrap视频教程）
<!DOCTYPE html> <html> <head> <title>Bootstrap 实例</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.1.0/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.12.5/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.1.0/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <h2>按钮样式</h2> <button type="button" class="btn">基本按钮</button> <button type="button" class="btn btn-primary">主要按钮</button> <button type="button" class="btn btn-secondary">次要按钮</button> <button type="button" class="btn btn-success">成功</button> <button type="button" class="btn btn-info">信息</button> <button type="button" class="btn btn-warning">警告</button> <button type="button" class="btn btn-danger">危险</button> <button type="button" class="btn btn-dark">黑色</button> <button type="button" class="btn btn-light">浅色</button> <button type="button" class="btn btn-link">链接</button> </div> </body> </html>
按钮类可用于 ,
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