function Person (name,age,sex){
  this.name = name;
  this.age = age;
  this.sex = sex;
}
Pserson.prototype = {
  constructor:Person,
  sayHello:function(){
    console.log('hello');
  }
}

function Person (info){
  this._init_(info);
}
Pserson.prototype = {
  constructor : Person,
  _init_ : function(info) {
    this.name = info.name;
    this.age = info.age;
    this.sex = info.sex;
  }
  sayHello:function(){
    console.log('hello');
  }
}

  var myNew = function(constructor, args) {
    var o = {};
    o.__proto__ = constructor.prototype;
    var res = constructor.apply(o, args);
    var type = typeof res;
    if (['string', 'number', 'boolean', 'null', 'undefined'].indexOf(type) !== -1) {
      return o;
    }
    return res;
  }

  _init_ : function(info) {
    this.name = info.name;
    this.age = info.age;
    this.sex = info.sex;
  }

 var type = typeof res;
  if(['string','number','boolean','null','undefined'].indexOf(type) !== -1){
    return o;
  }
  return res;

 function Person(name) {
    this.name = name;
  }
  Person.prototype.sayHello = function() {
    console.log(this.name);
  }
  var o1 = myNew(Person, ['pawn']);
  console.log(o1);
  o1.sayHello();

var Person = function(info){
  return new Person.prototype.init(info);
}
Person.prototype = {
  constructor: Person,
  init:function(){
    this.name = info.name.
  }
}
Person.prototype.init.prototype = Person.prototype;

var Person = function(info){
  return new Person.fn.init(info);
}
Person.fn = Person.prototype = {
  constructor: Person,
  init:function(){
    this.name = info.name;
    this.sayHello = function(){
      this.makeArray();
    }
  }
  makeArray:function(){
    console.log(this.name);
  }
}
// 这句话的作用 
// 虽然把makeArray 等常用方法挂载到 Person.prorotype 下面,但还是会被 init 这个实例使用.
Person.fn.init.prototype = Person.fn;

  var Person = (function(window) {
    var Person = function(name) {
      return new Person.fn.init(name);
    }
    Person.fn = Person.prototype = {
      constructor: Person,
      init: function(name) {
        this.name = name;
        this.sayHello = function() {
          this.makeArray();
        }
      },
      makeArray: function() {
        console.log(this.name);
      }
    }
    Person.fn.init.prototype = Person.fn;
    return Person;
  })();

  var p = Person('pawn');
  console.log(p);
  p.sayHello();

  var Person = {
    name: 'pawn',
    sayHello: function() {
      console.log(this.name);
    }
  }
  var p = Object.create(Person);
  console.log(p);
  p.sayHello();

Object.create = function(prototype){
  function Func(){};
  Func.prototype = prototype;
  var o = new Func();
  return o;
}