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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 ~Winter is the season of the year when lobsters are fewest, But the price is high, In recent years, From September 1 to December 31, the wild crayfish will be banned. This policy has always been in place, But I haven't seen the execution. Due to the habit of digging shrimps in winter, When people dig it, because they don't raise it by themselves, they don't have to put back the small eggs. It belongs to extinct fishing. Unless it is not found, it will also result in fewer and fewer lobsters in the second year. This is basically the pattern in recent years. The overfishing of people with high prices in the previous year will result in a large reduction in production in the second year. This person who often catches lobsters has deep experience. In recent years, it is more and more difficult to catch lobsters year by year.画了一辈子唐卡的顿珠大师，还在画他这辈子最美的那幅唐卡。可是，顿珠的儿子巴桑，却发现父亲已经快要失明，尽管这是大多数唐卡大师的宿命，也是他们一生追求的境界，但是，那张最美的唐卡，还画得出来吗？你真以为自己就是独孤求败？基本上是了。在一次开车的过程中，东健和别的车相撞，在生命弥留之际，东健对梦中所见的恶魔求情，希望让他放过自己，让其完成未完成的事业和感情。再次睁开眼，东健奇迹的存活，再次诊病的他遇到了前来看病的人——居然就是事故的另一方邰风（林峰 饰）。最令人惊讶的是，邰风的各项生理特征表明他已死去，原来他和恶魔签订了契约，成为了死亡代理人，前来找东健复仇……　　但旗下歌手宋玄（宋亚轩饰）和音乐制作人陶醉（李天泽饰）却交情深厚，经常相约工作室交流音乐。