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Let's start refactoring it step by step. The first step is still to provide the window.external.upload function to simulate the creation of the upload plug-in on the page. This part of the code has not changed: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.第三位夫人则是秦国公主，身份也非比寻常。《Train》讲述在杀人事件发生之夜，因瞬间的选择而分裂的两个世界中，为了保护珍贵的人而介入连环杀人的刑警的平行世界的悬疑电视剧。在他看来不过是一件小事，早已抛诸脑后。