引导4 - 导航栏折叠不会垂直居中对齐

Question

我使用Bootstrap v4，我注意到当徽标增加导航栏的高度时，导航栏折叠菜单垂直居中，我想是因为显示：flex。

如何使导航栏折叠菜单在导航栏顶部对齐？这个演示说明了这个问题：

<div id="app" class="container">
<nav class="navbar navbar-expand-md navbar-light bg-light">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav ml-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Pricing</a>
</li>
</ul>
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="{{ url('/login') }}">Login</a>
</li>
<li class="nav-item">
<a class="nav-link" href="{{ url('/register') }}">Register</a>
</li>
</ul>
</div>
</nav>
</div>

我试过删除display:flex并将其更改为内联，但无济于事。

Answer 1

将对齐项目启动类添加到导航栏，它将使导航栏的内容顶部对齐。

.navbar-brand {
height: 60px;
}
/* use "align-items-start" class, or */
.navbar {
align-items: flex-start !important;
}

<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-fQybjgWLrvvRgtW6bFlB7jaZrFsaBXjsOMm/tB9LTS58ONXgqbR9W8oWht/amnpF" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css" integrity="sha384-zCbKRCUGaJDkqS1kPbPd7TveP5iyJE0EjAuZQTgFLD2ylzuqKfdKlfG/eSrtxUkn" crossorigin="anonymous">

<div id="app" class="container">
<!-- add "align-items-start" to navbar -->
<nav class="navbar navbar-expand-md navbar-light bg-light align-items-start">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav ml-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Pricing</a>
</li>
</ul>
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="{{ url('/login') }}">Login</a>
</li>
<li class="nav-item">
<a class="nav-link" href="{{ url('/register') }}">Register</a>
</li>
</ul>
</div>
</nav>
</div>