javascript - 仅使用 JavaScript 捕获 ESC 键

Question

我有一个带有自己控件的自定义视频播放。我有一个脚本可以在用户进入并存在全屏时更改控件。问题是，当我使用 ESC 键而不是按钮退出全屏时，控件的样式更改不会恢复。我需要确保使用 ESC 或按钮退出全屏会导致相同的行为。

CSS:

function toggleFullScreen() {
  
  elem = document.getElementById("video_container");
  var db = document.getElementById("defaultBar"); 
  var ctrl = document.getElementById("controls");
  
  if (!document.fullscreenElement &&    // alternative standard method
      !document.mozFullScreenElement && !document.webkitFullscreenElement) {  // current working methods
    if (document.documentElement.requestFullscreen) {
          
          ctrl.style.width = '50%';
          ctrl.style.left = '25%';
          full.firstChild.src = ('images/icons/unfull.png');
          elem.requestFullscreen();          
        } else if (document.documentElement.mozRequestFullScreen) {
          full.firstChild.src = 'images/icons/unfull.png';
          ctrl.style.width = '50%';
          ctrl.style.left = '25%';
          elem.mozRequestFullScreen();
        } else if (document.documentElement.webkitRequestFullscreen) {
          
          ctrl.style.width = '50%';
          ctrl.style.left = '25%';
          full.firstChild.src = 'images/icons/unfull.png';
          elem.webkitRequestFullscreen();
          
        }
  } else if (document.exitFullscreen) {
        full.firstChild.src = 'images/icons/full.png';
        ctrl.style.width = '100%';
        ctrl.style.left = '0';        
        document.exitFullscreen();
        }
        else if (document.mozCancelFullScreen) {
        full.firstChild.src = 'images/icons/full.png';
        ctrl.style.width = '100%';
        ctrl.style.left = '0'; 
        document.mozCancelFullScreen();
        }
        else if (document.webkitCancelFullScreen) {
       
        ctrl.style.width = '100%';
        ctrl.style.left = '0';
        full.firstChild.src = 'images/icons/full.png';
        document.webkitCancelFullScreen();
        } 
}

Answer 1

event.key === "转义"

更新更简洁:使用 event.key。不再有任意数字代码!

document.addEventListener("keydown", function(event) {
    const key = event.key; // Or const {key} = event; in ES6+
    if (key === "Escape") {
        // Do things
    }
});

现代风格，带有 lambda 和解构

document.addEventListener("keydown", ({key}) => {
    if (key === "Escape") // Do things
})

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