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The first is to force important things into the field of vision of the pipeline.A mother's worst nightmare comes true when her teenage daughter goes missing.年轻女子在心脏病发作后活了下来，并一心想要了解这颗救命心脏背后的秘密。然而，随着她慢慢揭开捐赠者猝死的真相，她也越来越多地呈现出死者的特征，甚至包括一些难以理解的邪恶品性。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.