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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 ~大梁以西，估摸着是刘邦是要退守洛邑或者荥阳，荥阳的可能似乎更大一些。最后进去的人仔细将外面恢复原样，再看不出一点猫腻。云影气呼呼地道：可不是。绿菠跑到那小桶跟前，在小矮凳上坐下，果然高矮都合适，遂仰头甜甜地笑道：我好想现在就洗呢。