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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 ~小葱和秦淼也要跟上去，却被泥鳅娘紧紧拽住了。　　叶其辉紧急部署抓捕行动，未曾想一切竟是“幽灵”组织为排查卧底特意安排的虚假交易。抓捕行动失败，数名警员牺牲，万蕾陷入险境。31岁的林漾，工作得心应手却是个空巢女青年，正身处毫无波澜的生活死水中。24岁的陆正安，从小一起长大的邻家弟弟，突然学成归国闯入林漾的世界。24小时的全方位接触，彻底打乱了林漾的生活。林漾在陆正安的暖心呵护下，心理年龄“逆生长”变回了小女孩，两人牵手，一齐打怪闯关，朝幸福奔去。从弟弟到男友，从一起长大到一起变老，他为她长成大人，学会责任与担当，她因他变回小女孩，学会示弱与撒娇。生活虽苦，但好在有你这颗糖。皇帝看着跪地的几人，也是郁闷不已：这算什么事儿啊。How is IoC implemented