HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>remove clear list</title>
  <style>
    ul { padding-left: 20px; }
  </style>
</head>
<body>
  <ul id="list">
    <li>Apple</li>
    <li>Banana</li>
    <li>Cherry</li>
  </ul>
  <button type="button" id="clear">Clear list</button>
  <pre id="out">—</pre>
  <script>
    document.getElementById("clear").addEventListener("click", function () {
      var list = document.getElementById("list");
      [...list.children].forEach(function (item) { item.remove(); });
      document.getElementById("out").textContent = "children: " + list.children.length;
    });
  </script>
</body>
</html>

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Element.remove — clear children (Try It)