---
title: 海淀区合唱团表演
date: "2025-12-10"
---

<div class="lazy-video" data-src="choir_show.mp4">
  <!-- 预览图 -->
  <div class="video-preview" onclick="loadAndPlay(this)">
    <img src="video-thumbnail.jpg" alt="视频预览" class="preview-image">
    <div class="play-button">▶</div>
    <div class="video-info-overlay">
      <span>点击播放视频</span>
      <small>时长: 3:45</small>
    </div>
  </div>
  
  <!-- 视频播放器（初始隐藏） -->
  <div class="video-player" style="display: none;">
    <video controls>
      <source src="" type="video/mp4">
    </video>
    <button class="close-video" onclick="closeVideo(this)">✕</button>
  </div>
</div>

<script>
function loadAndPlay(element) {
  const container = element.closest('.lazy-video');
  const videoSrc = container.getAttribute('data-src');
  const preview = container.querySelector('.video-preview');
  const player = container.querySelector('.video-player');
  const video = player.querySelector('video');
  const source = video.querySelector('source');
  
  // 设置视频源
  source.src = videoSrc;
  video.load();
  
  // 切换显示
  preview.style.display = 'none';
  player.style.display = 'block';
  
  // 开始播放
  video.play();
}

function closeVideo(button) {
  const player = button.closest('.video-player');
  const container = player.closest('.lazy-video');
  const preview = container.querySelector('.video-preview');
  const video = player.querySelector('video');
  
  // 停止播放
  video.pause();
  video.currentTime = 0;
  
  // 切换显示
  player.style.display = 'none';
  preview.style.display = 'block';
}
</script>

<style>
.lazy-video {
  max-width: 800px;
  margin: 2rem auto;
}

.video-preview {
  position: relative;
  cursor: pointer;
  border-radius: 8px;
  overflow: hidden;
  background: #000;
  aspect-ratio: 16/9;
}

.preview-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.8;
  transition: opacity 0.3s;
}

.video-preview:hover .preview-image {
  opacity: 0.6;
}

.play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 70px;
  height: 70px;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  color: #007bff;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.video-info-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  color: white;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.video-player {
  position: relative;
  background: #000;
  border-radius: 8px;
  overflow: hidden;
}

.video-player video {
  width: 100%;
  height: auto;
  max-height: 600px;
  display: block;
}

.close-video {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(0,0,0,0.7);
  color: white;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}
</style>