源代码 ：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Bootstrap 实例 - 按钮大小</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> <p> <button type="button" class="btn btn-primary btn-lg">大的原始按钮</button> <button type="button" class="btn btn-default btn-lg">大的按钮</button> </p> <p> <button type="button" class="btn btn-primary"> 默认大小的原始按钮</button> <button type="button" class="btn btn-default"> 默认大小的按钮</button> </p> <p> <button type="button" class="btn btn-primary btn-sm">小的原始按钮</button> <button type="button" class="btn btn-default btn-sm">小的按钮</button> </p> <p> <button type="button" class="btn btn-primary btn-xs">特别小的原始按钮</button> <button type="button" class="btn btn-default btn-xs">特别小的按钮</button> </p> <p> <button type="button" class="btn btn-primary btn-lg btn-block">块级的原始按钮</button> <button type="button" class="btn btn-default btn-lg btn-block">块级的按钮</button> </p> </body> </html>
运行结果