html - 为什么 anchor 标记中的文本不可见？

Question

anchor 标记中的文本，如 feature、pricing 根本不可见。我尝试添加颜色属性，但它似乎不起作用。它只是将光标更改为单击，但我只能看到白色背景。

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js"></script>

<nav class="navbar navbar-expand-lg navbar-dark primary-color">
  <a class="navbar-brand" href="#">Navbar</a>
  <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="#">Feature ::::s</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">Pricing</a>
    </li>
  </ul>
</nav>

Answer 1

它们在那里 - 只是白色。

您需要在导航上设置背景颜色 - 使用 bg-dark.

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js"></script>

<nav class="navbar navbar-expand-lg bg-dark navbar-dark primary-color">
  <a class="navbar-brand" href="#">Navbar</a>
  <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="#">Feature ::::s</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">Pricing</a>
    </li>
  </ul>
</nav>