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Getting the manual does not mean that you have the guidelines, just like storing a lot of books, it does not necessarily mean that you will become a learned person.黎章又是一呆，被胡钧戳了一下，方才醒悟，忙大声应道：属下遵命。来到燕京科技大学门口，林白已经在那里等着了，林白还是以前的老样子，随意穿着一件外套，头发有些凌乱。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 ~自己种的青菜，别人家稀罕，玄武王府可不稀罕——盈虚园多着呢。众人听了愣愣的：这诗什么意思？可里面的小葱听了却动容，再一细想，又着忙起来。