Как сделать меню в Javascript?

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<ul id="menu">
  <li><a href="#">Home</a></li>
  <li><a href="#">About</a></li>
  <li><a href="#">Contact</a></li>
</ul>

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#menu {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
}

#menu li {
  float: left;
}

#menu li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

#menu li a:hover {
  background-color: #111;
}

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const menu = document.getElementById("menu");

menu.addEventListener("click", () => {
  menu.classList.toggle("open");
});

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<ul id="menu">
  <li><a href="#">Home</a></li>
  <li><a href="#">About</a></li>
  <li>
    <a href="#">Services</a>
    <ul>
      <li><a href="#">Web Design</a></li>
      <li><a href="#">Web Development</a></li>
    </ul>
  </li>
  <li><a href="#">Contact</a></li>
</ul>

<style>
  #menu {
    list-style-type: none;
    margin: 0;
    padding: 0;
  }

  #menu li {
    display: inline-block;
    background-color: #ddd;
  }

  #menu li a {
    display: block;
    padding: 8px;
    text-decoration: none;
  }

  #menu ul {
    display: none;
  }

  #menu li:hover ul {
    display: block;
    position: absolute;
  }
</style>

<script>
  const menu = document.querySelector('#menu');

  menu.addEventListener('click', function(event) {
    const target = event.target;
    const parent = target.parentNode;

    if (target.tagName === 'A') {
      parent.querySelectorAll('ul').forEach(function(ul) {
        ul.style.display = 'none';
      });
    } else if (parent.tagName === 'LI') {
      parent.querySelector('ul').style.display = 'block';
    }
  });
</script>