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Update 23.第二十三题.md #30

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2 changes: 1 addition & 1 deletion 源代码阅读/23.第二十三题.md
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* 1.`分类` 的加载在 `运行时`，`类拓展` 的加载在 `编译时`。

* 2.`分类` 不能给系统的类添加方法。
~~* 2.`分类` 不能给系统的类添加方法。~~
* 3.`类拓展` 只以声明的形式存在，一般存在 .m 文件中。