错误描述：

Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 21 beyond bounds [0 .. 20]'

分析“index 21 beyond bounds[0..20]”

也就是是说索引21超过了[0 20]这个界限，换言之，就是数组越界，此时可以检查下下标为21的索引，将其替换。

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