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In 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.前些日子自己也惋惜，越国没有堪当大用的名将。这两年时间一直在战场上搏杀，战场之外也要斗智斗力，可以说是疲惫至极。《我的疯狂圣诞》为Netflix 原创德国影集，报道称，鲁蛇巴斯mingtian6.com帝回家过圣诞节时，却得知他的兄弟在与前妻交往。正当兄弟俩大吵一架的时候，家里又有了一个大秘密！热血网友巧妙剪辑而成的彩虹小马之狂派金刚来袭篇。1. Support simple broadcast communication. When the state of the object changes, it will automatically notify the subscribed object.