html - 如何在 Bootstrap 4 中更改屏幕宽度的同时更改导航栏的颜色

Question

例如：假设我在导航标签中使用 navbar-dark 和 bg-dark，当我将屏幕宽度更改为 600px 左右时，我想将其更改为 navbar-light 和 bg-light（在 Bootstrap 4 中）

标签： htmlcsstwitter-bootstrap

Answer 1

使用 CSS 媒体查询来解决这个问题。示例代码在这里：

@media (max-width: 600px) {
 .navbar-dark.bg-dark{
    background-color: #ddd !important;
  }
}

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet"/>


<nav class="navbar navbar-dark bg-dark">
  <a class="navbar-brand" href="#">Navbar w/ text</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarText" aria-controls="navbarText" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarText">
    <ul class="navbar-nav mr-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>
    <span class="navbar-text">
      Navbar text with an inline element
    </span>
  </div>
</nav>