源代码 ：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Bootstrap 实例 - 按钮组的大小</title> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script> </head> <body> <div class="btn-group btn-group-lg"> <button type="button" class="btn btn-default">Button 1</button> <button type="button" class="btn btn-default">Button 2</button> <button type="button" class="btn btn-default">Button 3</button> </div> <div class="btn-group btn-group-sm"> <button type="button" class="btn btn-default">Button 4</button> <button type="button" class="btn btn-default">Button 5</button> <button type="button" class="btn btn-default">Button 6</button> </div> <div class="btn-group btn-group-xs"> <button type="button" class="btn btn-default">Button 7</button> <button type="button" class="btn btn-default">Button 8</button> <button type="button" class="btn btn-default">Button 9</button> </div> </body> </html>
运行结果