如何使用下面的导航链接将 Boostrap 4 中的导航栏徽标居中

Question

我似乎无法让导航栏徽标与其下方的导航链接中心对齐。我确定我遗漏了一些简单的东西，我已经查看了一些关于这个问题的其他帖子，但似乎都在使用旧版本的引导程序。我目前正在使用引导程序 4.0。

具体来说，我希望徽标位于单独的一行，而不是与链接位于同一行。

<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#"><img src="img/h-tech-logo-cropped.png"/></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
  <span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
  <ul class="navbar-nav">
    <li class="nav-item">
      <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">Our Services</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">About Us</a>
    </li>
    <li class="nav-item">
      <a class="nav-link disabled" href="#">Gallery</a>
    </li>
    <li class="nav-item">
      <a class="nav-link disabled" href="#">Contact Us</a>
    </li>
  </ul>
</div>

Answer 1

这是使用flexbox和自动边距实用程序的问题，如许多其他“Bootstrap 4 Navbar Center”问题中所述...

• 该导航栏被display:flex如此使用flex-column，以使内容栈
• 使用mx-auto自动x轴利润率中心。

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" >
<script src="https://code.jquery.com/jquery-3.3.1.js" integrity="sha256-2Kok7MbOyxpgUVvAk/HJ2jigOSYS2auK4Pfzbm7uH60=" 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" ></script>

<nav class="navbar navbar-expand navbar-light bg-light flex-column">
    <a class="navbar-brand mx-auto" href="#"><img src="img/h-tech-logo-cropped.png"></a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarNav">
        <ul class="navbar-nav">
            <li class="nav-item">
                <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Our Services</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">About Us</a>
            </li>
            <li class="nav-item">
                <a class="nav-link disabled" href="#">Gallery</a>
            </li>
            <li class="nav-item">
                <a class="nav-link disabled" href="#">Contact Us</a>
            </li>
        </ul>
    </div>
</nav>

Codeply 上的响应式演示

相关的“Bootstrap 4 Navbar Center”问题：
Bootstrap NavBar with left, center or rightaligned items
Bootstrap 4 navbar with 2 rows
Center an element in Bootstrap 4 Navbar
How to center nav-items in Bootstrap？