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Is IT a low-paid technical job?4, because beginners' attacks are mostly shooting, and this kind of ball is conducive to shooting.If you don't want to use the subway card, Xiaobian will tell you how to buy a single subway ticket.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.2. Ensure the normal operation of iTunes;隣の声 松下由樹 あめくみちこ