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Remember when I was working on the front end, That is, the first company that has just graduated, It is a company that does outsourcing projects. The company generally outsources Taobao activity pages and Tencent's game pages, We should have called it cutting the front end of the page at that time. Do some html and css work, So when I was doing Tencent's game page, Often help them make static pages, For example, put a few buttons on the page, We just helped Tencent games to fix the style according to the design draft. For example, the buttons on the page and so on, For example, how to operate the specified buttons, What happens when the button is clicked, We don't know, We don't know what their business is. Of course, what we know will definitely be a click event. We don't know exactly what business to deal with. Here we can use command mode to deal with it: after clicking the button, we must send requests to some objects responsible for specific behaviors, which are the recipients of the requests. However, at present we do not know what the receiver is or what the receiver will do. At this time, we can use command mode to eliminate the code coupling relationship between the sender and the receiver.有人担心道：这么说的话，这反秦岂不是难上加难？吴臣神情专注，仔细听尹旭说道：非也。A command in command mode refers to an instruction that performs certain things.这下子，叶麻可着实进入了孤立无援的状态。眼里有欢喜，还有不信。只有郑氏，断定没有人指使苞谷。亨利和弗雷迪是一对双胞胎兄弟,在他们还是婴儿的时候,因为意外失散了,而且他们也根本就不知道对方.亨利被一个非常诚实老实的人收养了,而弗雷迪却变成了一个匪徒.亨利是个非常腼腆的人,而且带有轻微的精神问题.可是随后,这对双胞胎的身份被揭开,原来他们是一个欧洲贵族家庭的孩子,而此时给他们留下一大笔的遗产……