将鼠标悬停在两个seoconds上时显示下拉菜单

<div class="dropdown">
  <span>两个seconds</span>
  <div class="dropdown-content">
    <a href="#">选项1</a>
    <a href="#">选项2</a>
    <a href="#">选项3</a>
  </div>
</div>

.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:hover .dropdown-content {
  display: block;
}

// 获取下拉菜单元素
var dropdown = document.querySelector('.dropdown');

// 添加鼠标悬停事件监听器
dropdown.addEventListener('mouseover', function() {
  // 显示下拉菜单
  dropdown.querySelector('.dropdown-content').style.display = 'block';
});

dropdown.addEventListener('mouseout', function() {
  // 隐藏下拉菜单
  dropdown.querySelector('.dropdown-content').style.display = 'none';
});