链表的常用操作。创建链表、求链表的长度、在链表中查找某个数据元素、在某个位置插入一个新的数据元素、在链表中删除某个数据元素等操作-List of commonly used operations. Create a linked list, find the length of the list, in the list to find a data element in a position to insert a new data element in a linked list operations such as delete a data element