15,面向对象原型继承

子类对象名.__proto__=父类对象名;

var use={
       name:'岳不群',
      age:123,
      ff:function () {
       console.log(this.name+'在跑步');
      }

  };
  var niao={
      fei:function () {
          console.log(this.name+'在飞');
      }
  };
var liyunlong={
      name: '李云龙'
};
liyunlong.__proto__=niao;