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Researchers used standard psychological methods to study the changes in climbers' brains when they analyzed various handles. They first noticed that experienced climbers and novices can identify each handle according to the type of grip they need. For example, in their psychological representation of various handles, all those handles that need to be grasped by wrinkle methods form a group and are distinguished from handles that need to be grasped by other methods. This grouping method is unconscious, just like when you see poodles and Great Dans, you immediately know that they are all members of the canine family, instead of saying to yourself, "Both are dogs."Next, we are going to implement the Validator class, which is used here as Context and is responsible for receiving the user's request and delegating it to the strategy object, as follows:大王，现在出兵和齐国争夺河北似乎……英布并未说下去，尹旭却是心知肚明，现在确实不适合与齐国在河北开战。偏偏在这个时候，洛水防线就这样失守了。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 ~