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 l