if (data != NULL) delete data;

                   } else

                            if (n == 0)

                            {

                                     close(fd);

                                     printf("Client close connect!/n");

                                     if (data != NULL) delete data;

                            } else

                            {

                                     data->n_size = n;

                                     // 设置需要传递出去的数据

                                     ev.data.ptr = data;

                                     // 设置用于注测的写操作事件