html和css中的Dropdown Div (可能是javascript?)

<div class="dropdown">
  <button class="dropdown-button">点击我</button>
  <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-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
}

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

document.querySelector('.dropdown-button').addEventListener('click', function() {
  var dropdownContent = this.nextElementSibling;
  if (dropdownContent.style.display === 'block') {
    dropdownContent.style.display = 'none';
  } else {
    dropdownContent.style.display = 'block';
  }
});