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(typeof this.getName !== "function"){
Person.prototype.getName = function () {
return this.name;
}
}
if (typeof this.toEat !== "function"){
Person.prototype.toEat = function (animal) {
console.log( this.getName() + "说去吃饭：");
animal.eat();
}
}
}
function Animal(name) {
this.name = name;
if (typeof this.getName !== "function"){
Animal.prototype.getName = function () {
return this.name;
}
}
}
function Cat(name) {
Animal.call(this,name);
if (typeof this.eat !== "function"){
Cat.prototype.eat = function () {
console.log(this.getName() + "吃鱼");
}
}
}
Cat.prototype = new Animal();
function Dog(name) {
Animal.call(this,name);
if (typeof this.eat !== "function"){
Dog.prototype.eat = function () {
console.log(this.getName() + "啃骨头");
}
}
}
Dog.prototype = new Animal();
var person = new Person("Tom");
person.toEat(new Cat("cat"));//Tom说去吃饭：cat吃鱼
person.toEat(new Dog("dog"));//Tom说去吃饭：dog啃骨头
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