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一场来自闺蜜的算计，让她成为了他最陌生的人，为了想要忘掉夏余生她花了整整五年，但是却还是抵不过想见他的心，本打算见最后一面了却心里最初的梦想，却没想到再次卷入一场阴谋，再次面对喜欢的人厌恶的眼神，心还是会痛......原来不是爱情太苦，只是还没遇到让你甜的人。一则，无论是看病还是读书，两院让当地民众直接受益。Http://www.jiemian.com/article/2062824.htmlSandra在生日的当天见证了一个完全莫名的爱情悲剧。那天Sandra在下班的途中，遇上一个男人向一个穿红衣的女人正安静地话别。红衣女子离开了，男人穿过马路向Sandra的方向缓缓走来，把手里的一个盒子交给了Sandra，这令她吃惊。“收下它吧，我留着也没有用了……希望它给你带来幸福”五秒钟后，Sandra手里托着这个珍贵的礼物，眼睁睁看着这个男人撞死在她的面前……她轻轻打开盒子，那是一个多么灵动的戒指，闪着荧荧的光，Sandra把她戴到了自己手上，以幸福的名义……(1) CopiesIn the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.In the previous example of electric lights, a state mode program was completed. First, the Light class is defined, which is also called Context here. Then in Light's constructor, to create instance objects for each state class, Context will hold references to these state objects in order to delegate the request to the state objects. The user's request, that is, the action of clicking button, is also implemented in Context, with the following code: