[（1）原型](%EF%BC%881%EF%BC%89%E5%8E%9F%E5%9E%8B.md) [（2）原型链,继承](%EF%BC%882%EF%BC%89%E5%8E%9F%E5%9E%8B%E9%93%BE,%E7%BB%A7%E6%89%BF.md) [（3）多态](%EF%BC%883%EF%BC%89%E5%A4%9A%E6%80%81.md)