为 <a>、<button> 或 <input> 元素添加按钮类（button class）即可使用 Bootstrap 提供的样式。
<a class="btn btn-default" href="#" role="button">Link</a> <button class="btn btn-default" type="submit">Button</button> <input class="btn btn-default" type="button" value="Input"> <input class="btn btn-default" type="submit" value="Submit">
效果：
使用下面列出的类可以快速创建一个带有预定义样式的按钮。
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Bootstrap 栅格系统</title> <link href="./BootStrap_3.3.7_libs/css/bootstrap.min.css" rel="stylesheet"> <script src="./jQuery/jquery-3.2.1.min.js"></script> <script src="./BootStrap_3.3.7_libs/js/bootstrap.min.js"></script> </head> <body> <!-- 使用BootStrap 之 CSS全局样式中的按钮 --> <h3>使用BootStrap 之 CSS全局样式中的按钮</h3> <!-- Standard button --> <button type="button" class="btn btn-default">（默认样式）Default</button> <!-- Provides extra visual weight and identifies the primary action in a set of buttons --> <button type="button" class="btn btn-primary">（首选项）Primary</button> <!-- Indicates a successful or positive action --> <button type="button" class="btn btn-success">（成功）Success</button> <!-- Contextual button for informational alert messages --> <button type="button" class="btn btn-info">（一般信息）Info</button> <!-- Indicates caution should be taken with this action --> <button type="button" class="btn btn-warning">（警告）Warning</button> <!-- Indicates a dangerous or potentially negative action --> <button type="button" class="btn btn-danger">（危险）Danger</button> <!-- Deemphasize a button by making it look like a link while maintaining button behavior --> <button type="button" class="btn btn-link">（链接）Link</button> <br><br><br><br><br><br> <!--不使用BootStrap 之 CSS全局样式中的按钮--> <h3>不使用BootStrap 之 CSS全局样式中的按钮</h3> <button type="button">（默认样式）Default</button> <button type="button">（首选项）Primary</button> <button type="button">（成功）Success</button> <button type="button">（一般信息）Info</button> <button type="button">（警告）Warning</button> <button type="button">（危险）Danger</button> <button type="button">（链接）Link</button> </body> </html>
效果：
详情参考：全局 CSS 样式
原文：https://www.cnblogs.com/liyihua/p/12405697.html