利用AI写了一个镶嵌在自己网站的公告代码

<!-- 公告弹窗 -->
<div id="announcement-modal" class="announcement-modal">
  <div class="announcement-content">
    <button id="close-announcement" class="close-btn">&times;</button>
    <div class="announcement-header">
      <h3>重要公告</h3>
    </div>
    <div class="announcement-body">
      <p>欢迎访问我们的网站！近期我们完成了系统升级，新增了多项实用功能，使用体验将更加流畅。如有任何问题，请联系客服。</p>      <!-- 你可以修改这里的公告内容 -->    </div>    <div class="announcement-footer">      <button class="confirm-btn">我知道了</button>    </div>  </div></div><style>/* 基础样式重置 */.announcement-modal * {  margin: 0;  padding: 0;  box-sizing: border-box;  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;}/* 弹窗遮罩层 */.announcement-modal {  position: fixed;  top: 0;  left: 0;  width: 100%;  height: 100%;  background-color: rgba(0, 0, 0, 0.5);  display: flex;  justify-content: center;  align-items: center;  z-index: 9999; /* 确保弹窗在最上层 */  opacity: 0;  visibility: hidden;  transition: opacity 0.3s ease, visibility 0.3s ease;}/* 弹窗显示状态 */.announcement-modal.show {  opacity: 1;  visibility: visible;}/* 弹窗内容容器 */.announcement-content {  background-color: #ffffff;  width: 90%;  max-width: 500px;  border-radius: 12px;  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);  overflow: hidden;  position: relative;  transform: translateY(-20px);  transition: transform 0.3s ease;}.announcement-modal.show .announcement-content {  transform: translateY(0);}/* 关闭按钮 */.close-btn {  position: absolute;  top: 15px;  right: 15px;  background: none;  border: none;  font-size: 24px;  color: #666666;  cursor: pointer;  width: 30px;  height: 30px;  display: flex;  justify-content: center;  align-items: center;  border-radius: 50%;  transition: background-color 0.2s ease;  z-index: 10;}.close-btn:hover {  background-color: #f5f5f5;  color: #333333;}/* 公告头部 */.announcement-header {  background-color: #4096ff;  color: white;  padding: 20px 25px;}.announcement-header h3 {  font-size: 18px;  font-weight: 600;}/* 公告内容 */.announcement-body {  padding: 25px;  color: #333333;  line-height: 1.6;}.announcement-body p {  font-size: 14px;  margin-bottom: 0;}/* 公告底部 */.announcement-footer {  padding: 15px 25px;  background-color: #f8f9fa;  text-align: right;}/* 确认按钮 */.confirm-btn {  background-color: #4096ff;  color: white;  border: none;  padding: 8px 20px;  border-radius: 6px;  cursor: pointer;  font-size: 14px;  transition: background-color 0.2s ease;}.confirm-btn:hover {  background-color: #337ecc;}/* 响应式适配 */@media (max-width: 480px) {  .announcement-content {    width: 95%;  }    .announcement-header {    padding: 15px 20px;  }    .announcement-body {    padding: 20px;  }    .announcement-footer {    padding: 15px 20px;  }}</style><script>// 公告弹窗核心逻辑document.addEventListener('DOMContentLoaded', function() {  const modal = document.getElementById('announcement-modal');  const closeBtn = document.getElementById('close-announcement');  const confirmBtn = document.querySelector('.confirm-btn');    // 从localStorage获取关闭时间  const closeTime = localStorage.getItem('announcementClosedTime');  const now = new Date().getTime();  const thirtyMinutes = 30 * 60 * 1000; // 30分钟的毫秒数    // 判断是否需要显示弹窗：没有关闭记录 或 关闭时间已超过30分钟  if (!closeTime || (now - closeTime) > thirtyMinutes) {    modal.classList.add('show');  }    // 关闭弹窗的通用函数  function closeModal() {    modal.classList.remove('show');    // 记录关闭时间到localStorage    localStorage.setItem('announcementClosedTime', new Date().getTime().toString());  }    // 绑定关闭按钮事件  closeBtn.addEventListener('click', closeModal);  confirmBtn.addEventListener('click', closeModal);    // 可选：点击遮罩层关闭弹窗  modal.addEventListener('click', function(e) {    if (e.target === modal) {      closeModal();    }  });});</script>