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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.在业余球队打杂的少年程童童天赋异禀，一个大脚能把足球踢到令人不可思议的距离，被五星体院足球班新上任的教练任军挖掘，特招进入足球班。童童在五星体院的新生活中，和新同桌陈雅静不打不相识，从冤家变成了好哥们。童童结识了陈中、尚海瑞等一众好友，俘虏了女神夏雨的芳心，开始走出阴霾，性格变得乐观开朗起来。童童刻苦钻研、习得足球必杀技，屡次在比赛中力挽狂澜，成为足球班的大功臣。热血少年，青春无悔，面对着不可预知的未来，众人勇敢逆风奔跑，携手再逆一次青春！结果，外面都是小解的，里面草丛中还蹲了好些大解的人。当查理在阿尔玛的后院右侧找到缅因州州长节日庆典的完美圣诞树时，阿尔玛和查理相遇了。一旁的夏说道：不会是李左车勾结汉军吧。3. Use object instead of string to record the current state, which makes the state switching more clear at a glance.