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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 ~以美食为主题，讲述了前“灯笼会”会长孙女赵静雅(袁百梓卉饰)继承祖辈的“赵家一招火锅店“后，在关文剑(王蕴凡饰)、黄泽斯(朱云龙饰)、谢佳元(段其宏饰)、夏明月(陈嘉敏饰)等朋友的帮助下，探寻美食秘方、历经爱恨情仇的故事《神秘博士》第13季宣布开拍。运作人Chris Chibnall透露新季将缩短为8集，因为该剧拍摄的复杂性，在新冠疫情下拍每一集所需的时间延长了，“不过《神秘博士》的雄心、幽默、乐趣和惊吓是不会少的。如今对全世界来说充满考验，但博士从不逃避挑战”。雍正年间，三阿哥弘时聪颖伶俐智勇双全却受人挑拨后导致皇上对自己日渐疏远。因此遭人嫉恨，被人追杀。中箭后的他意外穿越300年后的21世纪，成为林氏集团的准继承人。也因为早有婚约的关系与刁蛮任性的大小姐宗梦笛及宗氏集团二股东之子开了一段真挚浪漫的而又错综复杂的情感纠葛。宿命的情感轮回，以及王权及利益的致命危机。一场旷世奇缘，带着致命诱惑的爱情背后，深藏一个难以回首的伤痛秘密和惊天阴谋。"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:The code looks a little improved, but it still has the following disadvantages:The Play Method of Three-person Table Tennis Circular Match