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>
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