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　　故事以1934年的白洋淀为背景，以嘎子梦想参加八路，梦想得到一支属于自己的真枪展开。奶奶为了保护八路老钟牺牲了，嘎子只身上县城找传说中的罗金保，打鬼子替奶奶报仇。在县城结识了集贤居少掌柜佟乐，嘎子仇没报，反而陷入鬼子追杀。在佟乐和一个神秘便衣的帮助下，脱离险境。这些真的不重要了。侥幸有武功高强的冲出去了，也被满大街追杀。板栗也知到了清辉县，不惊动县令不可能，遂含笑应了。We may be able to predict the future development of science and technology, but we can only guess how human beings will use them.We can see the above code; Player-to-player coupling code has been removed, However, all logical operations are put into the intermediary object for processing. Any operation of a certain player does not need to traverse to notify other players, but only needs to send a message to the intermediary. The intermediary processes the message after receiving it, and after processing the message, the processing result will be fed back to other player objects. The intermediary mode is used to remove the coupling code between objects. Make the program more flexible.