无法在bootstrap 5的弹出窗口中添加结帐和清除购物车按钮

<div class="modal fade" id="cartModal" tabindex="-1" aria-labelledby="cartModalLabel" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="cartModalLabel">购物车</h5>
        <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
      </div>
      <div class="modal-body">
        <!-- 购物车内容 -->
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-primary">结账</button>
        <button type="button" class="btn btn-secondary">清除购物车</button>
      </div>
    </div>
  </div>
</div>

$('#cartModal').modal('show');