无论读者是否已经读过本系列的书籍，或者已经具备了多年的编程经验，我们仍将在这 一部分回顾一下所需要的基本知识，其目的就在于能够使读者更好地理解本书的实例。-Regardless of whether the reader has read the books in this series, or already have years of programming experience, we will look back in this part of the basic knowledge