- prototype2 构造函数继承
- 问题一: 当原型链中包含引用类型值的原型时,该引用类型值会被所有实例共享;
- 问题二: 在创建子类型(例如创建Son的实例)时,不能向超类型(例如Father)的构造函数中传递参数.
- rototype3 组合继承
- 组合继承其实调用了两次父类构造函数, 造成了不必要的消耗
- prototype4 原型继承
- prototype5 寄生继承+寄生组合式继承
- prototype6 new 运算符做了什么事情
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