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A) Studying the [design pattern] of GoF carefully and learning its intention and structure one by one is a way to learn English with a dictionary. Seeing mountains is mountains and seeing water is water, which may lead you to apply mechanically and imitate others in actual work.4. Read relevant papers to ensure that the latest developments in this field are not missed;The above analysis shows that one of the first three situations will inevitably occur after intercepting down, so intercepting down is no longer considered here. Let's look at the difference between events after intercepting down.小葱就一边照管家务，一边跟秦淼研习医书，顺便照看几个小的。The module mode uses an anonymous function that returns an object. Inside this anonymous function, private variables and functions are first defined for use by internal functions, and then an object literal quantity is returned as the value of the function. The returned object literal quantity only contains properties and methods that can be exposed. In this way, external use of the method can be provided; Since the public method in the return object is defined inside the anonymous function, it can access private variables and functions inside.