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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.The fifth step is to write the implementation of each state class. It is worth noting that StateFactory is used to avoid the problems caused by the absence of abstract classes in javascript.1981年，西南某宁静的城市，由于妈妈失言揭开了爸爸是大哥继父的惊人秘密，平静与和睦的生活不复存在。继父成为了植物人，母亲工作中意外触电离世，扔下了三个尚未成年的弟弟妹妹，半血缘关系的兄弟姐妹经历种种情感纠葛。大哥放弃、牺牲自我梦想，牺牲爱情，倾尽全力担当起养家的责任：成全发小的婚姻、甘愿为弟弟上法庭顶罪、替妹妹抚养孽缘所生的孩子，最大程度地成就了弟妹们的人生梦想。很大的后招？小田一愣。Let's start refactoring it step by step. The first step is still to provide the window.external.upload function to simulate the creation of the upload plug-in on the page. This part of the code has not changed:朱雀侯赵锋勇猛无敌，因性烈如火，智谋稍嫌欠缺。