Bootstrap下拉nav-link聚焦/点击时背景色修改方法咨询

你的问题出在CSS选择器定位错误——下拉菜单里的链接类是dropdown-item，而非nav-link，且原选择器的状态写法不符合需求。以下是正确的CSS规则：

/* 修改下拉菜单链接聚焦、点击激活、选中时的背景色为红色 */
.dropdown-item:focus,
.dropdown-item:active,
.dropdown-item.active {
  background-color: red !important;
  /* 可选：修改文字颜色为白色，提升可读性 */
  color: white !important;
}

修改后的完整代码 #

<!doctype html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Bootstrap demo</title>
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous">
  <style>
    .dropdown-item:focus,
    .dropdown-item:active,
    .dropdown-item.active {
      background-color: red !important;
      color: white !important;
    }
  </style>
</head>

<body>
  <nav class="navbar navbar-expand-lg bg-body-tertiary">
    <div class="container-fluid">
      <a class="navbar-brand" href="#">Navbar</a>
      <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
      <div class="collapse navbar-collapse" id="navbarSupportedContent">
        <ul class="navbar-nav me-auto mb-2 mb-lg-0">
          <li class="nav-item">
            <a class="nav-link active" aria-current="page" href="#">Home</a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
          </li>
          <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
            Dropdown
          </a>
            <ul class="dropdown-menu">
              <li><a class="dropdown-item" href="#">Action</a></li>
              <li><a class="dropdown-item" href="#">Another action</a></li>
              <li>
                <hr class="dropdown-divider">
              </li>
              <li><a class="dropdown-item" href="#">Something else here</a></li>
            </ul>
          </li>
          <li class="nav-item">
            <a class="nav-link disabled" aria-disabled="true">Disabled</a>
          </li>
        </ul>
        <form class="d-flex" role="search">
          <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
          <button class="btn btn-outline-success" type="submit">Search</button>
        </form>
      </div>
    </div>
  </nav>
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-YvpcrYf0tY3lHB60NNkmXc5s9fDVZLESaAA55NDzOxhy9GkcIdslK1eN7N6jIeHz" crossorigin="anonymous"></script>
</body>

</html>

说明 #

• dropdown-item:focus：匹配链接被键盘聚焦或鼠标点击聚焦时的状态
• dropdown-item:active：匹配链接被点击激活的瞬间状态
• dropdown-item.active：匹配链接被设置为选中（添加active类）的状态
• 使用!important是为了确保覆盖Bootstrap默认的内联或高优先级样式，若你的自定义CSS放在Bootstrap CSS之后，也可以尝试去掉!important测试优先级是否足够

内容的提问来源于stack exchange，提问作者well responsive