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Subject Content and Scope of Application家族企业第二季……转头细打量少年，口中嗤笑道：如何，你以为读书的都是谦谦君子？怎么人家理直气壮，你倒脸涨红了？你呀，该学学葫芦和板栗的机敏，别读成个书呆子才好。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 ~? Read the file and call JSON.parse to parse the load.Updated July 29