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D) Practicality and skepticism. When looking at shallow reference books or looking up materials on the Internet, you should type (copy or copy) the code and run it yourself. You should modify other people's source code more and put forward your own opinions: why is the book not designed like this and why is it designed like that? What if you add some methods, method parameters, or member variables? You must do it yourself, at least run it. In addition, we should dare to ask questions and make bricks to bloggers. You can even question the commentary and intention of some chapters of GoF, not to mention some bloggers.……没想到，真没想到哩，蝉儿果然成了他的媳妇。? Generally speaking, the factory mode is suitable: whenever a large number of products need to be created and have a common interface, they can be created through the factory method mode. Of the above three modes, the first cannot create the object correctly if the incoming string is wrong, and the third does not need to instantiate the chemical factory class compared with the second, so in most cases, we will choose the third-static factory method mode. ?B.JS is responsible for monitoring the add message and displaying the total number of clicks on the page. The following code:也许开战的那一天就料到会有这么一天吧，英布冷笑一声，笑的很是苦涩。许多孩子都知道了玩具店里的秘密，但是大人们仍然被蒙在鼓里。不断有小朋友来到玩具店，小精灵们欢迎孩子们的到来，热心地满足孩子们的各种愿望和梦想，帮助孩子解决在成长中遇到的小麻烦、小问题。在这个过程中，小精灵们自己也有很多收获，他们越来越懂得了在每个孩子内心，都有一个神奇的世界，其实每个小孩子都是聪明可爱的小精灵