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Parsing: Examining String Splicing2. Expansion and development are not restricted by regions;　　1860 年，英法联军向布防在张家湾的清军开战。直隶绿营总兵郑元培出征抗敌，血战之后身负重伤。张仰山和店里伙计林满江意外发现了奄奄一息的郑元培，在生死关头，张仰山化开一块比金子还贵的古墨为郑元培止血疗伤，保住了他的性命。郑元培伤愈之后欲重新回到战场作战，临行前为报张掌柜救命之恩，留书赠画，将怀素的《西陵圣母帖》和宋徽宗赵佶的《柳鹆图》送给张仰山。这两幅令多少大家皇族梦寐以求的稀世珍宝就这样存于了张家，张仰山将它们珍藏多年，不曾示人。此后，这书画不仅结成赵张两家几代的情谊，也带出了张氏子孙一段曲折动人的家族往事。In the above code, we use three functions, order500, order200, orderNormal to handle its own business logic, If the current own function cannot handle things, We pass it to the following function to handle it. By analogy, Until there is a function that can handle him, Otherwise, the responsibility chain mode will leave the chain directly, telling that it cannot be processed and throwing an error prompt. Although the above code can be used as the responsibility chain mode, we can see from the above code that the Order500 function depends on functions such as Order200, so there must be this function, which also violates the open-closed principle in object-oriented. Let's continue to understand writing flexible and detachable responsibility chain nodes.只见两女在地上抖缩成一团。In terms of product development, Osaka Weaving House has also gone through detours. For example, at first I made Japanese-style lace bras with steel rings, but I failed because more and more young women wanted to get rid of the shackles. Later, Osaka Weaving House only made bras without traces and rims.⑥ Initiation Dispatcher will call back the handle_event (type) callback method of the event handler to perform application-specific functions (functions written by developers themselves), thus corresponding to this event. The type of event that occurs can be used as a parameter of the method and internally by the method to perform additional service-specific separation and distribution.