Bootstrap 4 下拉菜单不起作用? [英] Bootstrap 4 Dropdown Menu not working?
问题描述
我复制了用于下拉菜单的官方 Bootstrap 4 示例，但它不起作用，即没有任何下拉菜单.
<a class="nav-link dropdown-toggle" href="#" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</a><div class="下拉菜单" aria-labelledby="dropdown01"><a class="dropdown-item" href="#">Action</a><a class="dropdown-item" href="#">另一个动作</a><a class="dropdown-item" href="#">这里还有别的东西</a> 如果其他人遇到这个问题，我相信 OP 的解决方案是他没有导入 popper.js.
检查 jQuery 和所有相关的 Bootstrap 组件是否存在.还要检查控制台并确保没有错误.
<html lang="zh-cn"><头><!-- 必需的元标记--><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1,shrink-to-fit=no"><!-- Bootstrap CSS --><link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css"integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0LQFAsjNJ0lyAFAsJnxtz"="匿名"><身体><nav class="navbar navbar-expand-lg navbar-light bg-light"><a class="navbar-brand" href="#">Navbar</a><button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle导航"><span class="navbar-toggler-icon"></span><div class="collapse navbar-collapse" id="navbarNavDropdown"><ul class="navbar-nav"><li class="nav-item active"><a class="nav-link" href="#">首页 <span class="sr-only">(current)</span></a><li class="nav-item"><a class="nav-link" href="#">功能</a><li class="nav-item"><a class="nav-link" href="#">定价</a><li class="nav-item dropdown"><a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">下拉链接</a><div class="下拉菜单" aria-labelledby="navbarDropdownMenuLink"><a class="dropdown-item" href="#">Action</a><a class="dropdown-item" href="#">另一个动作</a><a class="dropdown-item" href="#">这里还有别的东西</a></nav><!-- 可选的 JavaScript --><!-- 首先是 jQuery，然后是 Popper.js，然后是 Bootstrap JS --><script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5Kkn"cross/脚本><script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js"integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqKaISfwNz4M" crossorigin="anonymous"></script><-- 永远记得在调用bootstrap.min.js文件之前先调用上面的文件--><script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js"integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4N.;
