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Basic status information for sentinelAlso, if the array is empty and no initialValue is provided, a TypeError is thrownIn 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.抗日战争时期的东北三江市，中共地下组织被破坏，潜伏在伪警察局中的地下党员邓子华掩护自己的上级于德江撤离。脱险后的于德江查找叛徒。苏联情报员萨拉丽娃与邓子华取得联系，邓子华巧妙地掩护了前来接头的萨拉丽娃，并顺利地与萨拉丽娃接上了头。上级党组织交给三江市地下党一个名为“猎犬计划”的任务，目的是在苏联的配合下，得到日军东宁军事要塞的图纸。邓子华勇敢地牺牲了自己，把敌人的视线引开，萨拉丽娃将这份重要的图纸交给了苏联情报机关。一九四五年八月九日，苏联红军全线向中国境内的日军发动进攻，被日军称为“东方马其诺防线”的东宁要塞，被苏联红军摧毁，赢得了战争的胜利。6? Countermeasures of Network TerminalsEnter adb, as shown in the figure, which indicates that the adb environment variable has been successfully configured.凭着快速高产和一点运气，还真让天启做出了一点成绩。