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The above is just a synchronous chain of responsibilities, We let each node function return a specific value "nextSuccessor" synchronously, To indicate whether to pass the request to the next node, we will often encounter AJAX asynchronous requests in our development. After the request is successful, we need to do something so-and-so. At this time, if we apply the above synchronous request again, it will not take effect. Let's understand and use asynchronous responsibility chain to solve this problem. We add another prototype method Chain.prototype.next to the Chain class to manually pass the request to the next node in the responsibility chain.//and B methods; Method A and method B write specific business logic in subclasses in turn.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.小葱掀开车帘，看着桃树上含苞待放的野桃花，心想再过两日就要开了吧，往后再也不能看见这片桃林，不能坐在桃树上吹笛子，不能在树下嬉笑玩乐了。有什么分别？我武功高，他们武功低，强者胜而弱者败，这就是分别。Through these two examples, we can see that everyone has different understanding of the division of operations, because what I have done has not changed much, but it is different in the eyes of different people, because everyone has different understanding of the target products.The moonlight slanted into the window and shone straight on the bed, making the darkness even more horrible. Stephen responded, confirmed the environment, and was shocked. He opened the portal and returned to the sanctuary.