创建javascript弹出窗口最优雅的方式？

<div id="myModal" class="modal">
  <div class="modal-content">
    <span class="close-button">&times;</span>
    <p>这是一个模态对话框！</p>
  </div>
</div>

.modal {
  display: none;
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0,0,0,0.4);
}

.modal-content {
  background-color: #fefefe;
  margin: 15% auto;
  padding: 20px;
  border: 1px solid #888;
  width: 80%;
}

.close-button {
  color: #aaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
}

.close-button:hover,
.close-button:focus {
  color: black;
  text-decoration: none;
  cursor: pointer;
}

// 获取模态元素
var modal = document.getElementById("myModal");
var closeButton = document.getElementsByClassName("close-button")[0];

// 打开模态对话框
function openModal() {
  modal.style.display = "block";
}

// 关闭模态对话框
function closeModal() {
  modal.style.display = "none";
}

// 绑定事件
closeButton.onclick = closeModal;
window.onclick = function(event) {
  if (event.target == modal) {
    closeModal();
  }
};

// 示例：点击按钮打开模态对话框
document.getElementById("openModalButton").onclick = openModal;

<script src="https://cdn.jsdelivr.net/npm/sweetalert2@11"></script>
<script>
  Swal.fire({
    title: '成功！',
    text: '这是一个SweetAlert2弹出窗口！',
    icon: 'success',
    confirmButtonText: '确定'
  });
</script>

alert('这是一个简单的弹出窗口！');
let result = confirm('你确定要继续吗？');
if (result) {
  alert('你点击了确定！');
} else {
  alert('你点击了取消！');
}