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下拉菜单弹出方向默认为向下,当然我们也可以设置不同的方向。 如果你希望下拉菜单向右弹出,可以在 div 元素上添加 "dropright" 类: 实例 <!-- Default dropright button --> <div class="btn-group dropright"> <button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> Dropright </button> <div> <!-- Dropdown menu links --> </div> </div> <!-- Split dropright button --> <div class="btn-group dropright"> <button type="button" class="btn btn-secondary"> Split dropright </button> <button type="button" class="btn btn-secondary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> <span>Toggle Dropright</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> .dropright 类用于设置下拉菜单向右弹出:</p><br> <!-- Default dropright button --> <div class="btn-group dropright"> <button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> Dropright </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 dropright button --> <div class="btn-group dropright"> <button type="button" class="btn btn-secondary"> Split dropright </button> <button type="button" class="btn btn-secondary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> <span>Toggle Dropright</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: 下拉菜单的定位 | 下一篇: 指定向上弹出的上拉菜单 |