实现了双向链表的创建（头插法和尾插法）、插入结点，删除结点，双向链表的排序，可以动态的在链表的头尾插入结点。-To achieve the creation of a two-way linked list (end of the first interpolation and interpolation), insert node, delete node, doubly linked list of the sort, can be dynamically inserted in the list of the head and tail nodes.