移动端弹出菜单js特效

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Popup Menu Example</title>
<style>
  .menu {
    display: none;
    position: absolute;
    background-color: white;
    border: 1px solid #ccc;
    padding: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  }
  .menu ul {
    list-style-type: none;
    padding: 0;
  }
  .menu ul li {
    padding: 8px 16px;
    cursor: pointer;
  }
  .menu ul li:hover {
    background-color: #f0f0f0;
  }
</style>
</head>
<body>

<button id="menuButton">Open Menu</button>
<div class="menu" id="popupMenu">
  <ul>
    <li>Option 1</li>
    <li>Option 2</li>
    <li>Option 3</li>
  </ul>
</div>

<script>
  document.getElementById('menuButton').addEventListener('click', function() {
    var menu = document.getElementById('popupMenu');
    if (menu.style.display === 'block') {
      menu.style.display = 'none';
    } else {
      menu.style.display = 'block';
    }
  });

  // Close menu when clicking outside of it
  window.addEventListener('click', function(event) {
    if (!event.target.matches('#menuButton')) {
      var menus = document.getElementsByClassName('menu');
      for (var i = 0; i < menus.length; i++) {
        if (menus[i].style.display === 'block') {
          menus[i].style.display = 'none';
        }
      }
    }
  });
</script>

</body>
</html>