slice是对原本array的一个view。 slice可以向后扩展，不可以向前。 s[i]不可以超越len(),向后扩展不可以超越底层数组的cap。
- 要改变内容必须使用指针接收者
- 结构过大也考虑指针接收者
- 一致性：如有指针接收者，最好也使用指针接收者
-
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