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"Is-A" refers to the "one" of one class and belongs to another class, while "Has-A" is different, which indicates that a certain role has a certain responsibility. A common reason for the wrong use of inheritance instead of aggregation is to mistakenly treat "Has-A" as "Is-A". For example: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 ~打仗，哪有不死人的，她的叔叔和妹妹不也在杀靖国人吗。屋里坐了好几个妇人，泥鳅奶奶也在，还有个十二三岁的小姑娘，众人围着做针线说闲话。唉，为令狐冲和东方不败惋惜。北京高科技公司的青年才俊盛一朝为人正直，也因此得罪了老板，被炒了“鱿鱼”。心情郁闷的他因为酒后开车误撞了人，一念之差下，开始了逃亡香格里拉的旅程。　　在逃亡的过程中，盛一朝不幸跌落猎人设下的陷阱，幸好被善良的宝石商人潘基业所救。盛一朝非常感激潘基业的救……