//返回一個(gè)對(duì)象，該對(duì)象的原型為傳入的參數(shù)o,低版本使用
function createObject(o) {
  function Fn() {}
  Fn.prototype = o
  return new Fn()
}

//繼承函數(shù)
function inheritPrototype(SubType, SuperType) {
  SubType.prototype = Object.create(SuperType.prototype) //創(chuàng)建一個(gè)對(duì)象，使其指向原型指向父類的原型，將該對(duì)象作為子類函數(shù)的原型對(duì)象
  Object.defineProperty(SubType.prototype, "constructor", {
    enumerable: false,
    configurable: true,
    writable: true,
    value: SubType
  })
}

function Person(name, age, friends) {
  this.name = name
  this.age = age
  this.friends = friends
}

Person.prototype.running = function() {
  console.log("running~")
}

Person.prototype.eating = function() {
  console.log("eating~")
}


function Student(name, age, friends, sno, score) {
  Person.call(this, name, age, friends)
  this.sno = sno
  this.score = score
}

inheritPrototype(Student, Person)

Student.prototype.studying = function() {
  console.log("studying~")
}

var stu = new Student("why", 18, ["kobe"], 111, 100)
console.log(stu)
stu.studying()
stu.running()
stu.eating()

console.log(stu.constructor.name)