在开始游戏后，启动服务器和客户端，对背景的所有物体进行绘图在主程序运行的线程中，画面刷新将以一定的频率采用双缓冲技术对屏幕重绘，实时反映整个游戏的进行状态.-At the beginning of the game, start the server and client, all objects on the background graphics. Thread running in the main program, the screen refresh frequency will