SOURCE

function Parent(){
  this.name='zhangsan',
    this.id=2;
  this.getName = function(){
    console.log(this.name)
  }
}
Parent.prototype={
  getAge:function(){
    console.log('age')
  }
}

function SubClass(){
 this.name="lisi"
}
SubClass.prototype = new Parent();


var a = new Parent()
var b = new SubClass()
a.name='wangwu'
a.getName()
b.getAge()

function inhir(o){
  function F(){}
  F.prototype=o;
  return new F()
}

var c = inhir(Parent)
console.log(c.name)