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你二叔回来就要忙了，顾不着家。No. 71 J.C. CheeCode as above; You can see, There are obvious shortcomings, For example, when I click on an element, I need to create a div. I click on the second element to create a div again, We frequently click on such and such elements, and they will frequently create div elements. Although we can remove pop-up codes when we click Close, it is not good for us to frequently create and delete them, especially for performance, and frequent operations on DOM will cause redrawing, etc., thus affecting performance. Therefore, this is a very bad habit. We can now use the monomer mode to realize the pop-up effect. We can instantiate it only once. The following code:After understanding the concept of rules, let's talk about the components of rules. Here we only list the structure of rules in general, and the rules will be summarized separately in the following articles.I don't care whether you are Baidu's written examination or Ali's or Tencent's pen examination questions. My side is collectively referred to as the WrittenTest. Then your company has different pen examination questions, which will be implemented by subclasses. No matter how the parent class method is implemented, I don't care what the pen examination questions are. The code changes to the following:　Nikhil Katira是一名精神科护士，他在韦克菲尔德精神病院——坐落在澳大利亚蓝山山脉边缘的一家设施里，工作多年了。Nik能力非常强，他总能抚慰别人的伤痛，触及他人内心深处。在这样一个相当疯狂的地方，他是最稳定的那个人。但如今，Nik的病人在好转，他自己的心理问题却越来越严重。