JavaScript更改原型

//1.定义原型对象
var proto = {
  sentance : 4, //监禁年限
  probation: 2  //缓刑年限
};
//2.定义原型对象的构造函数
var Prisoner = function(name, id) {
  this.name = name;
  this.id = id;
};
//3.将构造函数关联到原型对象
Prisoner.prototype = proto;
//4.实例化对象-用工厂函数实例化原型对象
var makePrisoner = function(name, id) {
  var prisoner = Object.create( proto );
  prisoner.name = name;
  prisoner.id = id;
  return prisoner;
};

var firstPrisoner = makePrisoner( ‘aa‘, ‘a11‘ );
var secondPrisoner = makePrisoner( ‘bb‘, ‘b22‘ );