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To make a few brief points:因此刘邦略微的考虑之后，答应下来召见这位传说中的韩信。人生在世，谁还能不遇见一点事呢。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 ~正如张默说的：“我宁可相信，一个像丰珅殷德这样占有欲很强的花心男子，遇到一个喜欢的姑娘后，他也会动了真情，认真去追求这个姑娘，这正是我喜欢这个角度的原因，这很真实。”Data of MIME type;Public class TreeNode {