Click lần đầu sử event.preventDefault(); lầu sau not event.preventDefault();

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <script type="text/javascript" src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
</head>

<body>
  <ul>
  <li><a href="home/">Home</a></li>
  <li><a href="news/">News</a></li>
  <li class="subnav"><a href="about/">About</a>
    <ul>
      <li><a href="contact/">contact</a></li>
    </ul>
  </li>
</ul>
<script>
  function stopEventOnce(event) {
    event.preventDefault();
    $(this).unbind('click', stopEventOnce);
    return false;
  }
  $(".subnav a").bind('click', stopEventOnce);
</script>
</body>

</html>
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