video截取某一帧作为封面的方法

/**
 * 获取视频的封面图信息
 * @param url 视频地址
 * @param second 秒数
 */
async function getVideoBase64(url: string, second: number = 0) {
  const video = document.createElement('video');
  video.setAttribute('crossOrigin', 'anonymous'); // 处理跨域
  video.setAttribute('src', url);
  // 静音操作，防止播放失败
  video.setAttribute('muted', 'muted');
  video.addEventListener('loadeddata', async () => {
    const canvas = document.createElement('canvas');
    canvas.width = video.width;
    canvas.height = video.height;

    if (second) {
      video.currentTime = second;
      // 播放到当前时间的帧，才能截取到当前的画面
      await video.play();
      await video.pause();
    }

    canvas.getContext('2d')?.drawImage(video, 0, 0, width, height);
    return canvas.toDataURL('image/jpeg');
  });
}