Bootstrap下拉菜单 · 致力于web前端技术撰写

使用下拉菜单（Dropdown）插件，可以向任何组件（比如导航栏、标签页、胶囊式导航菜单、按钮等）添加下拉菜单。如果想要单独引用该插件的功能，那么需要引用 dropdown.js。或者可以引入bootstrap.js或压缩版的bootstrap.min.js。 ### 用法：通过 data 属性：向链接或按钮添加 data-toggle="dropdown" 来切换下拉菜单 ~~~ <!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="dropdown"> <a data-toggle = "dropdown" href="#">下拉菜单</a> <ul class="dropdown-menu" role = "menu"> <li><a href="#">测试工程师</a></li> <li><a href="#">开发工程师</a></li> <li>销售经理</li> </ul> </div> </body> </html> ~~~ ![](https://box.kancloud.cn/2016-04-07_570603f5e2f85.jpg) 我们不使用a标签时，可以看出，排版和使用了a标签是不一样的，通过审查元素可以看出，css中对.dropdown-menu>li>a是设置了样式的。 ~~~ .dropdown-menu>li>a { display: block; padding: 3px 20px; clear: both; font-weight: 400; line-height: 1.42857143; color: #333; white-space: nowrap; } .dropdown-menu>li>a:focus, .dropdown-menu>li>a:hover { color: #262626; text-decoration: none; background-color: #f5f5f5; } ~~~ ### 分割线：给li加上class = "divider" ~~~ <body style="padding: 20px;"> <div class="dropdown"> <button type = "button" class = "btn btn-primary dropdown-toggle" data-toggle = "dropdown" id = "dropdownMenu">下拉菜单 <span class = "caret"></span> </button>  <ul class="dropdown-menu" role = "menu" aria-labelledby = "dropdownMenu">  <li role = "presentation"><a href="#">测试工程师</a></li> <li role = "presentation"><a href="#">开发工程师</a></li> <li role = "presentation"><a href="#">销售经理</a></li> <li role = "presentation" class="divider"></li> <li role = "presentation"><a href="#">质量工程师</a></li> <li role = "presentation"><a href="#">项目经理</a></li> </ul> </div> </body> ~~~ ![](https://box.kancloud.cn/2016-04-07_570603f5f3792.jpg) ### 对齐：通过给.dropdown-menu 加上class pill-right可以使其向右对齐。 ~~~ <body style="padding: 20px;"> <div class="dropdown"> <button type = "button" class = "btn btn-primary dropdown-toggle" data-toggle = "dropdown" id = "dropdownMenu">下拉菜单 <span class = "caret"></span> </button>  <ul class="dropdown-menu pull-right" role = "menu" aria-labelledby = "dropdownMenu">  <li role = "presentation"><a href="#">测试工程师</a></li> <li role = "presentation"><a href="#">开发工程师</a></li> <li role = "presentation"><a href="#">销售经理</a></li> <li role = "presentation" class="divider"></li> <li role = "presentation"><a href="#">质量工程师</a></li> <li role = "presentation"><a href="#">项目经理</a></li> </ul> </div> </body> ~~~ ![](https://box.kancloud.cn/2016-04-07_570603f610b24.jpg) ### 下拉菜单标题：通过给li添加class dropdown-header给下拉菜单的标签区域添加标题（注意，li中不嵌套a标签） ~~~ <body style="padding: 20px;"> <div class="dropdown"> <button type = "button" class = "btn btn-primary dropdown-toggle" data-toggle = "dropdown" id = "dropdownMenu">下拉菜单 <span class = "caret"></span> </button>  <ul class="dropdown-menu" role = "menu" aria-labelledby = "dropdownMenu">  <li role = "presentation" class="dropdown-header">下拉菜单标题</li> <li role = "presentation"><a href="#">测试工程师</a></li> <li role = "presentation"><a href="#">开发工程师</a></li> <li role = "presentation"><a href="#">销售经理</a></li> <li role = "presentation" class="divider"></li> <li role = "presentation" class="dropdown-header">下拉菜单标题</li> <li role = "presentation"><a href="#">质量工程师</a></li> <li role = "presentation"><a href="#">项目经理</a></li> </ul> </div> </body> ~~~ ![](https://box.kancloud.cn/2016-04-07_570603f622406.jpg)