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Https://www.jiemian.com/article/2083146.htmlThe 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.茂密的原始森林中，生活着人类小孩毛克利。因某种原因他很小就成为了孤儿，黑豹巴希拉最先找到了他，并将毛克利托付给狼族的首领阿克拉。从此以后，毛克利以狼的身份在森林里成长起来，和他的兄弟姐妹们学习捕猎和求生技巧。然而并非所有动物都接受毛克利的存在，特别是曾被人类伤害的老虎谢利·可汗，更将男孩视为眼中钉肉中刺。谢利·可汗向狼族发出威胁，众狼们不得不为族群的命运做出考量。毛克利不希望“家人”为难，他选择离开狼群，而唯一陪伴他的巴希拉则希望带着男孩回归人类世界。即便如此，谢利·可汗也绝不肯善罢甘休，他对男孩展开了无休止的追杀……两人都静默下来，慢慢用完饭，又一起回去收赌债。One Observer interface: