visibilitychange 浏览器能见度改变？

const audio = new Audio();
audio.src = InitAudio;
audio.play();
document.addEventListener(‘visibilitychange‘, () => {
  console.log(document.visibilityState);
  if (document.visibilityState === ‘hidden‘) {
    setTimeout(() => {
      audio.pause();
    }, 50);
  } else {
    setTimeout(() => {
      audio.play();
    }, 300);
  }
},false);