SOURCE

function Dog(option) {
    //属性
    this.name = option.name;
    this.age = option.age;
    this.dogFriends = option.dogFriends;

    //方法
    this.eat = function(something) {
        console.log(this.name + '在吃' + something);
    };
    this.run = function(somewhere) {
        console.log(this.name + '跑' + somewhere);
    };

}
//小狗
var smallDog = new Dog({
    name: '小小',
    age: 1
});
smallDog.age = 10;
console.log(smallDog.name, smallDog.age);

smallDog.eat('奶');
smallDog.run('公园');

//大狗
var bigDog = new Dog({
    name: '大大',
    age: 10,
    dogFriends: ['白白', '胖胖']
});
console.log(bigDog.name);
bigDog.eat('apple');
bigDog.run('广场');