//parent
const healthObj = {
  showHealth : function() {
    console.log("오늘 운동시간 : " + this.healthTime);
  },
  setHealth : function(newTime) {
    this.healthTime = newTime;
  }
}

// child obj
const healthChildObj = {
  getAge : function() {
    return this.age;
  }
}

const lastHealthObj = Object.setPrototypeOf(healthChildObj, healthObj);

const childObj = Object.setPrototypeOf({
  age: 22
}, healthChildObj);

console.log("childObj is ", childObj);