如何让一个闪亮的应用程序自动全屏？

var element = document.documentElement;
if (element.requestFullscreen) {
  element.requestFullscreen();
} else if (element.mozRequestFullScreen) { // Firefox
  element.mozRequestFullScreen();
} else if (element.webkitRequestFullscreen) { // Chrome, Safari and Opera
  element.webkitRequestFullscreen();
} else if (element.msRequestFullscreen) { // Internet Explorer
  element.msRequestFullscreen();
}

document.addEventListener('fullscreenchange', function () {
  if (!document.fullscreenElement) {
    element.requestFullscreen();
  }
});