순수 CSS를 사용하여 반응형 탐색 모음의 드롭다운 탭 효과를 구현하는 단계

<nav class="navbar">
  <ul class="nav-list">
    <li><a href="#">首页</a></li>
    <li>
      <a href="#">产品</a>
      <ul class="dropdown">
        <li><a href="#">产品1</a></li>
        <li><a href="#">产品2</a></li>
        <li><a href="#">产品3</a></li>
      </ul>
    </li>
    <li><a href="#">关于我们</a></li>
    <li><a href="#">联系我们</a></li>
  </ul>
</nav>

.navbar {
  background-color: #333;
  height: 50px;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-list li {
  position: relative;
}

.nav-list li a {
  color: #fff;
  text-decoration: none;
  padding: 0 10px;
  line-height: 50px;
}

.dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: #333;
  width: 100%;
}

.dropdown li {
  width: 100%;
}

.dropdown li a {
  display: block;
  padding: 10px;
  color: #fff;
  text-decoration: none;
}

@media screen and (max-width: 768px) {
  .nav-list {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  .nav-list li {
    white-space: nowrap;
  }
  
  .nav-list li a {
    display: inline-block;
  }
  
  .dropdown {
    display: none;
  }
}

@media screen and (min-width: 769px) {
  .nav-list li:hover .dropdown {
    display: block;
  }
}