原型式继承对象

var obj={
  age:18,
  name:'张三'
}
function creatObject1(o){
  var newObj={}
  Object.setPrototypeOf(newObj,o)
  return newObj
}
function creatObject2(o){
  function newObj(){}
  newObj.prototype=o
  var fn=new newObj()
 
  return  fn
}
var info=creatObject2(obj)

var info1=creatObject1(obj)

var info2=Object.create(obj)
console.log(info.__proto__,info1.__proto__,info2.__proto__)

寄生式继承

var person={
  age:18,
  name:'张三'
}
function creatStudent(name,age){
  var newObj=Object.create(person)
  newObj.name=name
  newObj.age=age

  
  return newObj
}
var F1=creatStudent("三哥",18)
console.log(F1)