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II. Handling Methods话音落地之时，骂人的莽汉腮帮子鼓的老高，满嘴鲜血，牙齿不知掉了几颗。范文轩交代完事情之后，目光再次落到女人范依兰身上，叹道：依兰啊，以后家族重担就要落在你身上了，照顾好自己，照顾好延嗣……范依兰含泪点点头，心中无限悲伤。周菡慌忙摇头：没听说过。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.