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By Abby Norman真正的青春涂鸦再次在这里上演——You can see that PizzaStore depends on a SImpleFactory, which depends on an abstract pizza. Under normal circumstances, to decouple, control inversion is required. The core idea of control inversion is that neither the upper structure nor the lower structure depends on implementation, but on abstraction.他便问她，郑家各人都住在什么地方。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.