目前正在開發一個視頻播放器，如果視頻是全屏的，則添加特定的樣式類。如果用戶使用esc而不是全屏按鈕退出，樣式將保持不變。/* View in fullscreen */function openFullscreen(elem) {  if (elem.requestFullscreen) {    elem.requestFullscreen();  } else if (elem.webkitRequestFullscreen) { /* Safari */    elem.webkitRequestFullscreen();  } else if (elem.msRequestFullscreen) { /* IE11 */    elem.msRequestFullscreen();  }  video.classList.add('video-fullscreen');}/* Close fullscreen */function closeFullscreen() {  if (document.exitFullscreen) {    document.exitFullscreen();  } else if (document.webkitExitFullscreen) { /* Safari */    document.webkitExitFullscreen();  } else if (document.msExitFullscreen) { /* IE11 */    document.msExitFullscreen();  }  video.classList.remove('video-fullscreen');}let fullscreen = false;//Toggle fullscreenfunction toggleFullScreen(){    !fullscreen ? openFullscreen(player) : closeFullscreen();    fullscreen = !fullscreen;}我嘗試了esc按鈕的事件監聽器，這樣我就可以用它來改變樣式，第一個 esc 按下關閉，第二個按下我的代碼，非常煩人：//detect Escape key presswindow.addEventListener("keydown", (e) => {    if(e.key === "Escape" && fullscreen){        e.preventDefault();        closeFullscreen();        fullscreen = !fullscreen;   }});