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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.绍给朋友们，哄闹声中陈重抬头，发现站在面前的竟然是叶梅！Note: The above codes are all done according to the book. They all read the code of the book. The most important thing is that we understand the implementation of the policy mode. For example, the above form verification function is the code packaged in this way. We usually use JQuery plug-in form verification code to be packaged in this way. Therefore, we can also use this method to package forms and other learning in the future.还没动手，就从板栗身后树丛中钻出一个人，双方人数就一样多了。没有意义，你明白吗？徐风摇头，说：三年不到，我不会把它还给你。未来人类科技已可以把自己「上载」到自行选择的来世，而当主角Nathan（Robbie Amell饰）英年早逝后，他被上载到由Nora负责的天堂；剧中讲述Nathan在来世里逐渐习惯自己离开所爱后的「新生活」，以及现世的Nora在这份工作上的挣扎。 Andy Allo饰演活泼，有点叛逆的现代女孩Nora，在纽约市的她得同时应付患病的父亲及严格的工作，但Nora仍然渴望着爱情。没办法，和开始一起生活的邪神“百合”