【javascript】公有（特权）成员和私有成员

function Dog(nickname) {
//公有属性（特权属性）
this.feetCnt = 4;

//私有有属性
var name = nickname;
var age = 2;

//公有方法（特权方法）
this.sayName = function() {
alert(name);
}

//私有方法
function sayAge() {
alert(age);
}
}

//测试var dog = new Dog("Joke");console.log(dog.feetCnt); //4console.log(dog.name); //undefineddog.sayName(); //弹出Jokedog.sayAge(); //dog.sayAge is not a function