js 物件導向

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function Animal(name) {    this.name = name;}Animal.prototype.eat = function(food) {    console.log("food");};Animal.prototype.getName = function(){    return this.name;};var a = new Animal('hello');a.eat("world");console.log(a.getName());console.log(a.name);function Ferret(){}Ferret.prototype = new Animal();//Ferret.prototype.__proto__ = Animal.prototype;Ferret.prototype.type = "Domestic";Ferret.prototype.eat = function (food) {    Animal.prototype.eat.call(this,food);    //    console.log("Ferret Eat:..");};var f = new Ferret();f.eat();