监听多媒体事件 oncanplay

<video
  oncanplay="this.play()"
  muted="muted"
  autoplay="autoplay"
  loop="loop"
  preload="auto"
  width="100%"
  height="auto"
  data-setup="{}"
>
  <source src="xxx.mp4" type="video/mp4">
  <source src='xxx.webm' type='video/webm'>
  <p>
    To view this video please enable JavaScript, and consider upgrading to a web browser that
    <a href="https://videojs.com/html5-video-support/" target="_blank">supports HTML5 video</a>
  </p>
</video>