class Game {
  (중략)
  onBattleMenuInput = (event) => {
    (중략)
    } else if (input === '2') { // 회복

      const { hero, monster } = this;
      hero.hp = Math.min(hero.maxHp, hero.hp + 20);
      monster.attack(hero);
      this.showMessage('체력을조금회복했다.');
      this.updateHeroStat();

    } else if (input === '3') { // 도망

      this.changeScreen('game');
      this.showMessage('부리나케도망쳤다!');
      this.monster = null;
      this.updateMonsterStat();

    }
  }
}