JavaScript:如何切换HTML5视频全屏/非全屏？

// 获取视频元素
var video = document.getElementById('myVideo');

// 切换到全屏模式
function enterFullscreen() {
  if (video.requestFullscreen) {
    video.requestFullscreen();
  } else if (video.mozRequestFullScreen) {
    video.mozRequestFullScreen();
  } else if (video.webkitRequestFullscreen) {
    video.webkitRequestFullscreen();
  } else if (video.msRequestFullscreen) {
    video.msRequestFullscreen();
  }
}

// 退出全屏模式
function exitFullscreen() {
  if (document.exitFullscreen) {
    document.exitFullscreen();
  } else if (document.mozCancelFullScreen) {
    document.mozCancelFullScreen();
  } else if (document.webkitExitFullscreen) {
    document.webkitExitFullscreen();
  } else if (document.msExitFullscreen) {
    document.msExitFullscreen();
  }
}

// 监听全屏状态改变事件
document.addEventListener('fullscreenchange', function(event) {
  if (document.fullscreenElement) {
    // 进入全屏
    console.log('进入全屏');
  } else {
    // 退出全屏
    console.log('退出全屏');
  }
});

// 切换全屏/非全屏
function toggleFullscreen() {
  if (document.fullscreenElement) {
    exitFullscreen();
  } else {
    enterFullscreen();
  }
}