isa 指针

原創 wangchen2009hao 2020-02-24 08:05

每个对象都有一个 isa 指针，指向内存里面的对象，对象里面保存的是方法列表，调用对象的方法的时候就是通过 isa 指针找到对应的类的地址，调用方法列表

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