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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.你家的船咱们都避着走。一名男子的妻子遭器官贩卖组织杀害。一心复仇的他与亡妻心脏的女人产生了交集The execution results are consistent with the previous code, but the benefits of using the state mode are obvious. It can localize the relationship between each state and its corresponding behaviors, which are scattered and encapsulated in their corresponding state classes, making it easy to read and manage the code. In addition, the switching between states is distributed within the state class, which makes it unnecessary to write too many if, else conditional branch languages to control the switching between states.　　五人除了是好同事，私底下更是好兄弟。贼仔、头皮暗地收了天叔小舅子--黑社会成员叛徒东的黑钱，同时想拉天叔、阿邦和阿华下水。除了阿邦，其他两人都下水了。6. Use Your Customers to Find Customers