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如果你希望上拉菜单向上弹出,可以在 div 元素上添加 "dropup" 类: 实例 <!-- Default dropup button --> <div class="btn-group dropup"> <button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> Dropup </button> <div> <!-- Dropdown menu links --> </div> </div> <!-- Split dropup button --> <div class="btn-group dropup"> <button type="button" class="btn btn-secondary"> Split dropup </button> <button type="button" class="btn btn-secondary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> <span>Toggle Dropdown</span> </button> <div> <!-- Dropdown menu links --> </div> </div> 完整代码 <!DOCTYPE html> <html> <head> <title>Bootstrap 实例(小白教程网 2d5.net)</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script> </head> <body> <div> <h2>下拉菜单</h2> <p> .dropup 类用于设置下拉菜单向上弹出:</p><br><br><br><br><br><br><br><br> <!-- Default dropup button --> <div class="btn-group dropup"> <button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> Dropup </button> <div> <!-- Dropdown menu links --> <a href="#">Action</a> <a href="#">Another action</a> <a href="#">Something else here</a> <div></div> <a href="#">Separated link</a> </div> </div> <!-- Split dropup button --> <div class="btn-group dropup"> <button type="button" class="btn btn-secondary"> Split dropup </button> <button type="button" class="btn btn-secondary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> <span>Toggle Dropdown</span> </button> <div> <!-- Dropdown menu links --> <a href="#">Action</a> <a href="#">Another action</a> <a href="#">Something else here</a> <div></div> <a href="#">Separated link</a> </div> </div> </div> </body> </html> 效果图 |
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上一篇: 指定向右弹出的下拉菜单 | 下一篇: 指定向左边弹出的下拉菜单 |