Library-Manager-master

代码说明：

说明：  The front-end and back-end are completed by themselves. The front-end uses some basic frameworks (after all, I mainly focus on the development direction of the back-end). Most of the functions used in the back-end are implemented and encapsulated by themselves from the bottom, and almost no third-party frameworks are used. Generally speaking, it is relatively simple, and there may be defects or loopholes in some places.