链表的相关内容，包跨链表头插法，尾插法，节点查询，节点删去，排序-List of relevant content, including cross-list head interpolation, tail interpolation nodes query node deleting, sorting, etc.

链表实现代码，可作为头文件直接引用，提供链表和双向链表的各种功能，封装很好 -Linked list implementation code can be used as the header file directly quoted, linked lists and doubly linked lists provide a variety of functions, packaged well