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Method 2: Delete rules according to specific matching conditions and actionsSentinel clusters communicate with each other, Communicates the status of the redis node, Make corresponding judgment and process, The subjective offline state and the objective offline state here are more important states, They determine whether to fail over, You can subscribe to the specified channel information, When the server fails, notify the administrator that the client can regard Sentinel as a Redis server that only provides subscription function. You cannot use the PUBLISH command to send information to this server, but you can use the SUBSCRIBE command or the PSUBSCRIBE command to obtain corresponding event reminders by subscribing to a given channel. A channel can receive events with the same name as this channel. For example, a channel named + sdown can receive events that all instances enter the subjective offline (SDOWN) state.电影《狙击时刻》讲述中国特种兵为执行任务与境外雇佣兵殊死搏斗的故事，影片环环相扣，片中最大的看点莫过于火爆的动作场面，精彩的犯罪悬疑剧情更是紧紧抓住影迷的心。How to improve the classification ability? Apart from practicing and thinking more, I think the core is two points:该剧讲述了被冤枉成为杀人犯的女主人公痛快地向这个充满谎言的世界复仇的故事。1. Single Case ModeThe 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.