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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 ~//Delete Child Node都已经以社会人的身份生活，成为了正经的大人。Https://www.jiemian.com/article/1893186.htmlIt is worth mentioning that in the next two 15-year targets, there is no longer the target of doubling GDP, but a new target of a beautiful China has been added.方威早得了消息，便笑嘻嘻地说道：我爹说了，不大办，说是等我哥中了进士的时候再大办。