如何在横向模式下转换导航栏和导航控制器

.horizontal-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #333;
  color: #fff;
  padding: 10px;
}

.horizontal-nav a {
  color: #fff;
  text-decoration: none;
  margin: 0 10px;
}

.horizontal-nav a:hover {
  color: #ccc;
}

<div class="horizontal-nav">
  <a href="#">Home</a>
  <a href="#">About</a>
  <a href="#">Contact</a>
  <a href="#">Login</a>
</div>

<div class="horizontal-nav">
  <a href="#">Home</a>
  <a href="#">About</a>
  <div class="dropdown">
   <button class="dropbtn">Dropdown</button>
    <div class="dropdown-content">
      <a href="#">Link 1</a>
      <a href="#">Link 2</a>
      <a href="#">Link 3</a>
    </div>
  </div>
  <a href="#">Contact</a>
  <a href="#">Login</a>
</div><script>
  // 获取下拉菜单的按钮
  var dropdownBtn = document.querySelector('.dropbtn');
  // 获取下拉菜单的内容
  var dropdownContent = document.querySelector('.dropdown-content');

  // 为下拉菜单的按钮添加点击事件
  dropdownBtn.addEventListener('click', function() {
    // 切换下拉菜单的显示状态
    dropdownContent.classList.toggle('show');
  });
</script><style>
  .dropdown {
    position: relative;
    display: inline-block;
  }

  .dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
  }

  .dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
  }

  .dropdown-content a:hover {
    background-color: #f1f1f1;
  }

  .show {
    display: block;
  }
</style>