static void PrintLink(MyLink <int> l, string text = "输出:")
        {
            int data = 0;

            Console.Write(text);
            for (int i = 0; i < l.GetLinkLength(); i++)
            {
                l.GetElement(i + 1, ref data);
                Console.Write(data.ToString() + " ");
            }
            Console.WriteLine();
        }