数组之makeObjectsPerformSelector:withObject:

- (void)makeObjectsPerformSelector:(SEL)aSelector; - (void)makeObjectsPerformSelector:(SEL)aSelector withObject:(id)argument; 这是 NSArray和NSSet的两个方法，相信你们不多用，它相似于 for循环，但有效率高于for循环 makeObjectsPerformSel

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