全屏

• 参考网页https://developer.mozilla.org/zh-CN/docs/Web/API/Document/exitFullscreen
• 具体

document.onclick = function (event) {
  if (document.fullscreenElement) {
    document.exitFullscreen()
  } else {
    document.documentElement.requestFullscreen()
  }
};

• 具体还是看网页比较好哦，很详细的