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假设双向链表结点的结构定义如下：每个结点包含数据域data，指向直接前驱的指针prev，指向直接后继的指针next。
s->prev = p; s->next = p->next; p->next->prev = s; p->next = s;
p->next = s; s->prev = p; s->next = p->next; p->next->prev = s;
s->next = p->next; p->next->prev = s; p->next = s; s->prev = p;
s->prev = p; p->next = s; s->next = p->next; p->next->prev = s;