实现了服务器：数据的保存及转发； 联网对战：桌位的选择、悔棋、认输、和棋； 聊天模块：文本聊天、语音聊天； 练习模式：难度的划分、悔棋。(The server is implemented: data storage and forwarding; Network play: table selection, undo, defeat, and; Chat module: text chat, voice chat; Practice mode: Division, undo the