如何在javascript函数中显示引导模式？

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css"><script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script><script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>

<div class="modal" tabindex="-1" role="dialog" id="myModal">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title">引导模式</h5>
       <button type="button" class="close" data-dismiss="modal" aria-label="关闭">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        <p>这是一个引导模式示例。</p>
      </div>
      <div class="modal-footer">
       <button type="button" class="btn btn-secondary" data-dismiss="modal">关闭</button>
       <button type="button" class="btn btn-primary">保存</button>
      </div>
    </div>
  </div>
</div>

function showModal() {
  $('#myModal').modal('show');
}