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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.(1) 3D Material Library: http://www.3dczk.com/这是一部展示我国缉毒警察智勇双全，与贩毒犯罪分子展开殊死斗争的故事。　　　　--Rebuild the database log file (delete the corresponding log under this folder before performing this step, as shown in this example, delete Example_log. Ldf first.)