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Allows an object to change its behavior when its internal state changes. Object appears to have modified its class.何况有苏岸小心谨慎的贴身保护，越王微服出游的消息外人也并不知晓，所以问题不大。Let's take a look at our traditional AJAX request again, such as our traditional AJAX request. After the request is successful, we need to do the following things:十七年前，江万贯被仇家追杀，无奈之下他带着还在襁褓中的江北、江南，横跨无尽海域，从中央大陆来到灵气匮乏的极北大陆，隐姓埋名至今。神秘势力到来，昔日封印即将破除，打破了安静的生活。江北在一次次的战斗中崭露头角，识破了神秘势力的来历，解决了危机。撼天动地的战斗，打破了“绝天地通”，中央大陆的天才们借助传送阵来到极北大陆，江北为了守护大陆的安宁，和高高在上的中央大陆天才针锋相对，展露实力，逼着他们传送离开后，重新将空间封锁，天地隔绝。How many have you been cheated? Is the bill record still there?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.The core idea of this pattern is the so-called IIFE (Immediately Invoked Function Expression), which determines the required parameter categories according to the environment.