AutoXuetangx.js

const config = {
  rate: 1, // playing rate
  interval: 1 // the interval for check video ended
}

const play = () => {
    const video = document.querySelector('video');
    if (video && video.ended) {
      console.log('AutoXuetangx now change to play next video.');
      const list = document.querySelector('ul.active');
      const current = Array.from(list.children).filter((i) =>
        i.querySelector('li.active')
      );
      if (current.length === 0) {
        $($('h2')[1]).html(
          $($('h2')[1]).html() +
            '<br><small> 没有下一个视频了 - AutoXuetangX </small>'
        );
        console.log('AutoXuetangx cannot found next video.');
        return;
      }
      const next = current[0].nextElementSibling;
      next.querySelector('span').click();
    } else {
      console.log('AutoXuetangx is waiting for video ended.');
    }
    video.muted = true;
    video.playbackRate = config.rate;
    video.play();
  }

const clear = setInterval(() => play(), 1000 * config.interval);
const pause = () => clearInterval(clear);