增加当前节点p的后一个节点s:LNode* s = (LNode*)malloc(sizeof(LNode));if (s == NULL) return false;s->data = e;s->next = p->next;p->next = s;增加当前节点p的前一个节点s:LNode* s = (LNode*)malloc(sizeof(LNode));if (s == NULL) return false;s->data = e;s->next = p;p = s;