我一直在尝试应用这个 Bootstrap 4.0 - Two NavBars that collapse into one toggle回答我的问题，但经过一些努力后仍未解决。
我正在尝试将两个导航栏的内容折叠成一个切换按钮。
这两个问题是一旦折叠成 sm 我的切换按钮不显示其内容(来自任一目标)，并且在 sm 宽度下我的下导航栏不保持它的高度。我的代码:
<head>
<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/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm"
crossorigin="anonymous">
<title>Hello, world!</title>
</head>
<body>
<nav class="navbar navbar-expand-sm navbar-dark bg-dark sticky-top">
<button class="navbar-toggler" data-toggle="collapse" data-target="#collapse_target1, #collapse_target2">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="collapse_target1">
<ul class="navbar-nav mx-auto">
<li class="nav-item">
<a class="nav-link" href="#">Link 1</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link 2</a>
</li>
<a class="navbar-brand">
<img src="https://image.freepik.com/free-vector/businessman-shouting-through-megaphone_23-2147511376.jpg" style="height: 2em">
<span>Home</span>
</a>
<li class="nav-item">
<a class="nav-link" href="#">Link 3</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link 4</a>
</li>
</ul>
</div>
</nav>
<nav class="navbar navbar-expand-sm navbar-light bg-light">
<div class="collapse navbar-collapse" id="collapse_target2">
<ul class="navbar-nav mx-auto">
<li class="nav-item">
<a class="nav-link" href="#">Link 5</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link 6</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link 7</a>
</li>
</ul>
</div>
</nav>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin="anonymous"></script>
</body>最佳答案
使用单个类来对导航栏进行数据定位，而不是使用不同的 ID。例如，为两个 navbar-collapse 元素赋予 navbars 类，然后目标是 data-target=".navbars"。
演示:https://www.codeply.com/go/PvHpcBNuAp
此外，我不确定您为什么要在第一个导航栏上使用 如果您希望两个导航栏都固定在顶部，see this answer .sticky-top。您应该删除它，否则第二个导航栏将在移动设备上滑动到第一个导航栏下方。
<nav class="navbar navbar-expand-sm navbar-dark bg-dark">
<button class="navbar-toggler" data-toggle="collapse" data-target=".navbars">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse navbars" id="collapse_target1">
<ul class="navbar-nav mx-auto">
<li class="nav-item">
<a class="nav-link" href="#">Link 1</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link 2</a>
</li>
<a class="navbar-brand">
<img src="https://image.freepik.com/free-vector/businessman-shouting-through-megaphone_23-2147511376.jpg" style="height: 2em">
<span>Home</span>
</a>
<li class="nav-item">
<a class="nav-link" href="#">Link 3</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link 4</a>
</li>
</ul>
</div>
</nav>
<nav class="navbar navbar-expand-sm navbar-light bg-light">
<div class="collapse navbar-collapse navbars" id="collapse_target2">
<ul class="navbar-nav mx-auto">
<li class="nav-item">
<a class="nav-link" href="#">Link 5</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link 6</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link 7</a>
</li>
</ul>
</div>
</nav>
关于html - Bootstrap 4 将两个导航栏折叠成一个切换按钮，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48970058/