var object = {
  name: "Eric",
  age: 24,
  sayHi: function(){
   console.log("My name is "+ this.name + " this year is " + this.age + "years old.")
  }
 };

 var object = new Object();
 object.name = "Eric";
 object.age = 24;
 object.sayHi = function(){....};

 function Person() {
  this.name = "Eric";
  this.age = 24;
  this.sayHi = function(){
   console.log(this.name);
  }
 }

 var object1 = new Person();
 var object2 = new Person();

 function Person() {
  this.name = 'Eric';
  this.age = 24;
 }
 Person.prototype = {
  sayHi: function() {
  },
 };

 var object1 = new Person();
 var object2 = new Person();

 function Person(name,age) {
  this.name = name || "";
  this.age = age || "";
 }
 Person.prototype = {
  sayHi: function() {
  },
 };

 var object1 = new Person(name1,age1);
 var object2 = new Person(name2,age2);

 function Person(option) { //用一个对象把所有参数覆盖
  this.name = option.name || "";
  this.age = option.age || "";
 }
 Person.prototype = {
  sayHi: function() {
  },
 };

 var object1 = new Person({
   name: "Eric",
   age: 24
  });
 var object2 = new Person({
   name: "XXX",
   age: xx
  });

 function Person(option) {
  this._init(option);
 }
 Person.prototype = {
  _init: function (option){
   this.name = option.name;
   this.age = option.age;
  },
  sayHi: function(){
   console.log("HI");
  }
 };

 var object1 = new Person({
   name: "Eric";
   age: 24
  });
 object1.sayHi();