SOURCE

function foo(name,age){
  this.name = name;
  this.age = age;
  this.habit = 'games';
  return {}
}

foo.prototype.sex = '男';

foo.prototype.a =function(){
  console.log('函数');
}

var person = new foo('wgf','18');
console.log(person.name)
console.log(person.age)
// person.a()

///模拟new 
//1.访问构造函数变量与内部函数
//2.访问构造函数的原型

function objFactory(){
  var obj = new Object();
  var Constructor = [].shift.call(arguments);
  obj.__proto__ = Constructor.prototype;
  Constructor.apply(obj,arguments);
  return obj;
}

var person1 = objFactory(foo,'wgf1','250')

console.log(person1.name)
console.log(person1.age)
console.log(person1.sex)

//3返回值处理
function objFactory(){
  var obj = new Object();
  var Constructor = [].shift.call(arguments);
  obj.__proto__ = Constructor.prototype;
  var result = Constructor.apply(obj,arguments);

  return typeof result == 'object' ? result : obj  ;
}
var person2 = objFactory(foo,'wgf2','251')


console.log(person2.name)
console.log(person2.age)
console.log(person2.sex)