setTimeOut在一个对象里面

Question

我很确定这只是一个语法问题，但经过一堆谷歌搜索，我无法找到如何正确执行此操作。我试图在一个对象内部的函数内部使用setTimeout来调用同一对象内的不同函数。由于某种原因，该函数未被调用。这是相关的代码。有问题的setTimeout位于第一个函数hitKey中。在此先感谢您的帮助：

var gameBoard = {
  greenKey: document.querySelector("#green"),
  redKey: document.querySelector("#red"),
  blueKey: document.querySelector("#blue"),
  yellowKey: document.querySelector("#yellow"),
  allKeys: document.querySelector("#keys"),
  hitKey: function(keyColor) {
    this.lightKey(keyColor);
    setTimeout(this.unlightKey, 1000, keyColor);
  },
  enableKeys: function() {
    this.allKeys.addEventListener("click, hitKey");
  },
  disableKeys: function() {
    this.allKeys.removeEventListener("click, hitKey");
  },
  lightKey: function(keyColor) {
    switch (keyColor) {
      case "green":
        this.greenKey.style.backgroundColor = "GreenYellow";
        break;
      case "red":
        this.redKey.style.backgroundColor = "DeepPink";
        break;
      case "blue":
        this.blueKey.style.backgroundColor = "Cyan";
        break;
      case "yellow":
        this.yellowKey.style.backgroundColor = "Gold";
        break;
    }
  },

  unlightKey: function(keyColor) {
    switch (keyColor) {
      case "green":
        this.greenKey.style.backgroundColor = "Green";
        break;
      case "red":
        this.redKey.style.backgroundColor = "Red";
        break;
      case "blue":
        this.blueKey.style.backgroundColor = "Blue";
        break;
      case "yellow":
        this.yellowKey.style.backgroundColor = "Yellow";
        break;
    }
  }
};