从JavaScript退出Chrome全屏--开始-全屏

if (document.exitFullscreen) {
  document.exitFullscreen();
} else if (document.mozCancelFullScreen) { // Firefox
  document.mozCancelFullScreen();
} else if (document.webkitExitFullscreen) { // Chrome, Safari and Opera
  document.webkitExitFullscreen();
} else if (document.msExitFullscreen) { // IE/Edge
  document.msExitFullscreen();
}

if (document.webkitCancelFullScreen) {
  document.webkitCancelFullScreen();
}