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Conclusion: As long as there is this instance in the task, the page with singleTask set will be reused all the time, and every time the existing instance is reused, the other instances above (FirstActivity here) will be emptied, and the page will be directly promoted to the top of the stack, that is, it will display itself.　　第6集，三浦翔平饰演原是乐队队员的医生，笠原秀幸饰演寿司匠人，丸山智己饰演在人事部工作的上班族，山口纱弥加饰演一名公司职员。Est (2, true, 500); This method does not match from the first node order500 in the chain, returns the success string, and then this.success & & this.successor.passRequest.apply (this.success, arguments); Execute this code; As we said above, the attribute this.Successor refers to two methods, order200 and orderNormal, so the method order200 is called, so the value is returned, and so on. Then if we want to recharge 300 yuan's red envelopes in the future, we can write the function Order300, then list the chain chain and package it, and specify the order in the responsibility chain. The business logic inside does not need to be processed.Here are two ways to enter DFU mode:The adapter pattern of the object is the origin of various patterns. Let's look at the following figure:Illustration of Event Delivery MechanismIt is almost impossible to understand using a chip without looking at its data sheet.