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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 ~The above design, as commented above, when executing the Resize method of SmartTest, if a rectangular object is passed in, when the height is greater than the width, the width will be automatically increased until it exceeds the height. However, if a square object is passed in, it will fall into a dead loop. The fundamental reason at this time is that rectangles cannot be the parent class of squares. Since there is a problem, they can be reconstructed so that both of them inherit from quadrilateral classes. The refactoring code looks like this:某商业部门的贾主任是家庭妇女华家芳的丈夫，他极力反对妻子学理发， 家芳趁其外出的机会，参加了理发行业的工作。一天，家芳接获丈夫将于当天回家的信件，心慌意乱，以致在为顾客服务时，发型走样，遭到顾客的责难。久旱逢甘霖，简直就是及时雨啊。板栗想起周家那些叔伯，遂平静下来，微笑道：是我眼界窄了。明朝嘉靖年间，奸相严嵩把持朝政，御史张应鸿为人刚直屡次参劾严嵩不法，反被陷害遭贬成为云南小官，并派捕快鬼见愁护送张应鸿至云南任队员。峨嵋山上习武的馨馨得知其父贬官之事气愤难当，欲前往京城，却被师兄柳玉树阻止。遂赶往云南路上，保父安全。同时，蝶娘与梨儿母女也动身前往寻找张应鸿，以拿回古城圣物。张应鸿被鬼见愁护送到金沙驿站，阳春为其准备的欢迎会上出现众多为张应鸿而来的人，一夜之间整个驿站人声鼎沸，一场充满谋杀阴影的故事就此展开……张应鸿逃出重围正欲前往云南时，误入天龙山庄，孰知阴差阳错的查出庄主柳天龙勾结严嵩走私贩毒。阳春因此案声名大噪，调至顺天府，当上总捕头。严嵩父子对阳春恨之入骨，处处设下围套要致阳春于死地。在柳玉树的仇恨，严嵩父子的强权掠夺之下，阳春却步步为赢的恶势力对抗……