skiplist 的实现和原理，勉强凑点字数，哎哎哎啊-implementation and principle of skiplist, barely scrape together the point of words, arrr ah

Thread-safe Skiplist Using Integer Identifiers.

对磁盘中的文件进行SkipList结构构建，并进行快速查找、快速删除、快速插入、快速保存及快速恢复等操作-The files on the disk structure SkipList build, and to quickly find, quickly delete, quickly insert, quick save and quick recovery operations