页面没有交互，js不能触发播放

DOMException: play() failed because the user didn't interact with the document first. https://goo.gl/xX8pDD

<video id="video" muted autoplay>
<button id="unmuteButton"></button>

<script>
  unmuteButton.addEventListener('click', function() {
    video.muted = false;
  });
</script>