ts（typescript）面向对象之类的继承

类继承的作用

继承可以描述类与类之间的关系，
例如：在斗地主的小游戏中，我们只看牌,牌里面有分4种花色的牌（除了大小王）,♥，♠，♦，♣，我们可以知道♥的牌是牌,♠的牌是牌……,形如：在中文的描述种，什么是什么，例如 A 是 B，我们就可以理解成 A 是 B的子集（数学角度上）B 包含 A

在程序编程思想中，如果A和B都是类，并且可以描述为A是B，则A和B形成继承关系：

B是父类，A是子类
B派生A，A继承自B
B是A的基类，A是B的派生类

如果A继承自B，则A中自动拥有B中的所有成员

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属性继承：获取父类牌的花色，这是一个父类的属性，字类可以直接拿到

方法继承：假设牌都有一个方法叫做来摸我（瞎说的哈）,这个方法应该是属于玩家类的行为，用于理解继承父类后，属性和方法也被同时继承。

成员重写

重写(override)：子类中覆盖父类的成员,

注意

子类成员不能改变父类成员的类型
无论是属性还是方法，子类都可以对父类的相应成员进行重写，但是重写时，需要保证类型的匹配。

但是有一点，如果我们字类和父类的参数保持一致，但是如果父类的返回值类型是void，字类可以随便定义返回值类型。如下：

原因：

注意this关键字：在继承关系中，this的指向是动态——调用方法时，根据具体的调用者确定this指向;
super关键字：在子类的方法中，可以使用super关键字读取父类成员（这个成员是指父类的方法，不能获取父类的属性）

this 和 super 的区别( 在子类中)

如果方法或者属性没有进行重写，那么this 和 super 是一样的。

如果方法进行重写：
this 指向的是当前子类的实例，而super指向的是父类

super当作属性使用的时候， super 指向的是父类的原型，因此super无法拿到父类的实例属性，只能拿到父类的public和protected的方法，super 如果当方法使用的话，只能在字类的构造函数中并且是第一行使用，需要使用super()来实例化父类里面的属性，确保字类可以获取父类的成员。

继承的类型匹配

字类的对象，永远可以赋值给父类，（鸭子辩型法，或者子结构法）例如：

面向对象中，这种现象，叫做里氏替换原则(是里氏这个人提出的原则，哈哈)
如果需要判断一个数据的具体子类类型，可以使用instanceof

类的单根性和传递性

单根性：每个类最多只能拥有一个父类

传递性：如果A是B的父类，并且B是C的父类，则，可以认为A也是C的父类

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