1.字面量的方式建立物件 

var obj = {}; //空物件

//新增屬性
obj.name = "小白";
obj.age = 10;
obj.sayHi = function () {
    console.log("我是：" + this.name);
}

obj.sayHi();

2.優化後的寫法

var obj2 = {
    name: "小明",
    age: 20,
    sayHi:function () {
        console.log("我是：" + this.name);
    },
    eat:function () {
        console.log('吃了');
    }
}

obj2.sayHi();
obj2.eat();