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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.军士这便松手，老人迅速挣脱爬起，踉跄着步子冲入大殿内。My neighbor, Aunt Wang, who bought vegetables for trouble, bought a pair of sports shoes for her grandson at the stall last year. Nike's imitation was surprisingly cheap. A week later, my grandson came back from school with swollen feet. "Shoes are not made of good materials and are not breathable..." When I went to the hospital, the doctor diagnosed fungal infection. As a result, the treatment cost more than 700 yuan.故事描述普通女大学生Paige（Bella Thorne）参加一部好莱坞热门影片试镜，结果一鸣惊人，从此成为明星。她必须学会适应「星光灿烂」的新生活，同时处理好与剧组中两个男演员的关系。与此同时，她还要暗中调查一个著名流行歌手神秘失踪之谜。一桩十九年未破的“八角亭悬案”让玄家人笼罩在阴霾下，亲人间的猜疑与疏离像水镇的氤氲般无法平静。当凶案再次出现，尘封的记忆和伤痛再次让玄家人陷入爱与恨的深渊……If we need to do something later, we also need to write the called method in it. In this way, the code is highly coupled, so we now use the publish-subscribe mode to see how to refactor the above business requirements code.First of all, there is a select selection box on the page, then there is an input box for the input purchase quantity, and there are also two display areas, namely, the display area for the selected color and the input quantity, and the next button operation.