update 13_Inheritance.md. 修正标题错误 (#608)
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本页包含内容:
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- [定义一个基类(Base class)](#defining_a_base_class)
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- [定义一个基类(Defining a Base Class)](#defining_a_base_class)
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- [子类生成(Subclassing)](#subclassing)
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- [重写(Overriding)](#overriding)
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- [防止重写(Preventing Overrides)](#preventing_overrides)
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可以为类中继承来的属性添加属性观察器(property observers),这样一来,当属性值改变时,类就会被通知到。可以为任何属性添加属性观察器,无论它原本被定义为存储型属性(stored property)还是计算型属性(computed property)。
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<a name="defining_a_base_class"></a>
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## 定义一个基类(Base class)
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## 定义一个基类(Defining a Base Class)
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不继承于其它类的类,称之为*基类(base class)*。
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