KeysPressed是位掩码的。我如何解位掩码，并使其成为关键状态的结构？(Javascript)

const KeysPressed = {
  A: 1,      // 00000001
  B: 2,      // 00000010
  C: 4,      // 00000100
  D: 8,      // 00001000
  // 添加更多按键...

  // 将按键状态初始化为0
  state: 0,

  // 按下按键时设置对应位为1
  press(key) {
    this.state |= key;
  },

  // 松开按键时将对应位重置为0
  release(key) {
    this.state &= ~key;
  },

  // 检查某个按键是否被按下
  isPressed(key) {
    return (this.state & key) !== 0;
  }
};

// 示例用法
KeysPressed.press(KeysPressed.A);
KeysPressed.press(KeysPressed.B);
KeysPressed.press(KeysPressed.C);

console.log(KeysPressed.isPressed(KeysPressed.A));  // 输出: true
console.log(KeysPressed.isPressed(KeysPressed.B));  // 输出: true
console.log(KeysPressed.isPressed(KeysPressed.C));  // 输出: true
console.log(KeysPressed.isPressed(KeysPressed.D));  // 输出: false

KeysPressed.release(KeysPressed.B);

console.log(KeysPressed.isPressed(KeysPressed.B));  // 输出: false