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For example, if we want to implement a JS function, Such as form validation, Then if we don't use the policy pattern in javascript described in the previous chapter to solve the form validation encapsulation code, It is a temporary form validation function written by itself. Certainly without any encapsulation, Then at this time, we will pop up a prompt to the user for whether the two values are equal. If there is a form verification on another page, their judgment method and business logic are basically the same, but the comparison parameters are different. Should we consider writing a form verification code again? So now we can consider using the template method pattern to solve this problem. Common methods are extracted, and different methods are implemented by specific subclasses. This design code also has the advantages of stronger scalability and better code ~想是还未睡沉，不然该打呼噜了。翘儿做了个鬼脸，咱们进去探探他考得如何？这不好吧。不管了，我还是写我的小说吧。现在还是不敢放你们，怕你们万一有个闪失，麻烦可就大了。马上轻松下来，很自然地告诉了他。Module2 needs to be loaded before module1 is fully loaded, and module2 needs module1 to be loaded. In this state, what we can get from the exports object is this part before the circular dependency occurs. In the above code, only the a attribute is introduced, because both B and C need to be loaded after module2 is introduced.