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The scenarios used in the command mode include: sometimes it is necessary to send a request to some objects, but I don't know who the recipient of the request is or what the operation of the request is. At this time, I hope to design the program code in a loosely coupled way; So that the request sender and the request receiver eliminate the coupling relationship in each other's codes.Public event DoSth myDoSth;· Increased sweating;北魏，有个小女孩叫花木兰（徐娇饰演小花木兰），与父亲花弧相依为命。她受父亲影响从小偷练武功，私学阵法，武艺高强。木兰（赵薇饰演）十八岁时，游牧民族柔然犯境，军情紧急，魏国全民征兵。木兰不忍年迈的父亲再上战场，便灌醉父亲，违抗军令，悄悄地替父从军。Half a month later, horrible bodies went to sea one after another, revealing the truth of the biggest pirate murder and robbery since the founding of the People's Republic of China.香荽笑道：住哪，也不是我想的。Let's understand such a problem first, If our front-end development needs are the needs given to us by the demand side, It is possible that a front-end developer will deal with multiple demanders, Therefore, it will keep in touch with multiple demand parties. Then in the program it means keeping references to multiple objects, The larger the program, There will be more and more objects, The relationship between them will become more and more complicated. Now if there is an intermediary (if it is our supervisor) to meet the needs of multiple demanders, Then the demander only needs to give all the requirements to our supervisor, who will assign tasks to us according to our workload in turn. In this way, our front-end development does not need to contact with multiple business parties, we only need to contact our supervisor (i.e. Intermediary), which weakens the coupling between objects.