let Lucky=function(kind,body,name,character){//子類別
  Person.call(kind,body);//第一個步驟，呼叫母類別對子類別初始化
  this.name=name;
  this.character=character;
}
Lucky.prototype=Object.create(Person.prototype);//第二個步驟，建立物件連結Person的prototype並讓子類別繼承
Lucky.prototype.constructor=Worker.constructor;//第三個步驟，將建構函數指向自己
Lucky.prototype.bark=function(){//會覆蓋原型物件的函式內容
  console.log("woof~woof~);
}
Lucky.prototype.shakehand=function(){
  console.log(this.name+ "shakes hand with you.");
}