Bootstrap按钮菜单 · 致力于web前端技术撰写

### 按钮下拉菜单向按钮添加下拉菜单，只需要简单地在在一个 .btn-group 中放置按钮和下拉菜单即可 ~~~ <!doctype html> <html lang="en"> <head>  <meta http-equiv="content-type" content="text/html;charset=utf-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="Keywords" content="关键词一，关键词二"> <meta name="Description" content="网站描述内容"> <meta name="Author" content="Yvette Lau"> <meta name = "viewport" content = " width = device-width, initial-scale = 1 "> <title>BootstrapDemo</title>  <link rel="stylesheet" type="text/css" href="../bootstrap-3.3.5-dist/css/bootstrap.min.css"> <script type="text/javascript" src = "../jquery-1.11.2.min.js"></script> <script type="text/javascript" src = "../bootstrap-3.3.5-dist/js/bootstrap.min.js"></script> </head> <body style="padding: 20px;"> <div class="btn-group btn-group-lg"> <button type="button" class="btn btn-info dropdown-toggle" data-toggle = "dropdown">按钮菜单 <span class = "caret"></span> </button> <ul class="dropdown-menu" role = "menu"> <li role = "presentation"><a href="#">子菜单1</a></li> <li role = "presentation"><a href="#">子菜单2</a></li> <li role = "presentation"><a href="#">子菜单3</a></li> <li role = "presentation"><a href="#">子菜单4</a></li> </ul> </div> <div class="btn-group btn-group-lg"> <button type="button" class="btn btn-warning dropdown-toggle" data-toggle = "dropdown">按钮菜单 <span class = "caret"></span> </button> <ul class="dropdown-menu" role = "menu"> <li role = "presentation"><a href="#">子菜单1</a></li> <li role = "presentation"><a href="#">子菜单2</a></li> <li role = "presentation"><a href="#">子菜单3</a></li> <li role = "presentation"><a href="#">子菜单4</a></li> </ul> </div> </body> </html> ~~~ 此处我们未使用div class = "dropdown"，尽管dropdown也可以实现按钮下拉菜单，但是dropdown是块级显示的。而.btn-group 的display是inline-block. 效果： ![](https://box.kancloud.cn/2016-04-07_570603f69e447.jpg) ### 分割的按钮下拉菜单使用两个Button，一个显示内容，另一个用来显示下拉功能 ~~~ <body style="padding: 20px;"> <div class="btn-group btn-group-lg"> <button type="button" class="btn btn-info">按钮菜单</button> <button type="button" class="btn btn-info dropdown-toggle" data-toggle = "dropdown"> <span class = "caret"></span> </button> <ul class="dropdown-menu" role = "menu"> <li role = "presentation"><a href="#">子菜单1</a></li> <li role = "presentation"><a href="#">子菜单2</a></li> <li role = "presentation"><a href="#">子菜单3</a></li> <li role = "presentation"><a href="#">子菜单4</a></li> </ul> </div> <div class="btn-group btn-group-lg"> <button type="button" class="btn btn-warning">按钮菜单</button> <button type="button" class="btn btn-warning dropdown-toggle" data-toggle = "dropdown"> <span class = "caret"></span> </button> <ul class="dropdown-menu" role = "menu"> <li role = "presentation"><a href="#">子菜单1</a></li> <li role = "presentation"><a href="#">子菜单2</a></li> <li role = "presentation"><a href="#">子菜单3</a></li> <li role = "presentation"><a href="#">子菜单4</a></li> </ul> </div> </body> ~~~ 效果： ![](https://box.kancloud.cn/2016-04-07_570603f6adf1b.jpg) ### 按钮上拉菜单只需要在.btn-group容器中添加.dropup即可。 ~~~ <body style="padding: 200px;"> <div class="btn-group btn-group-lg dropup"> <button type="button" class="btn btn-info">按钮菜单</button> <button type="button" class="btn btn-info dropdown-toggle" data-toggle = "dropdown"> <span class = "caret"></span> </button> <ul class="dropdown-menu" role = "menu"> <li role = "presentation"><a href="#">子菜单1</a></li> <li role = "presentation"><a href="#">子菜单2</a></li> <li role = "presentation"><a href="#">子菜单3</a></li> <li role = "presentation"><a href="#">子菜单4</a></li> </ul> </div> <div class="btn-group btn-group-lg dropup"> <button type="button" class="btn btn-warning">按钮菜单</button> <button type="button" class="btn btn-warning dropdown-toggle" data-toggle = "dropdown"> <span class = "caret"></span> </button> <ul class="dropdown-menu" role = "menu"> <li role = "presentation"><a href="#">子菜单1</a></li> <li role = "presentation"><a href="#">子菜单2</a></li> <li role = "presentation"><a href="#">子菜单3</a></li> <li role = "presentation"><a href="#">子菜单4</a></li> </ul> </div> </body> ~~~ ![](https://box.kancloud.cn/2016-04-07_570603f6c0ae7.jpg)