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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.由央视纪录频道推出的系列纪录片《城市24小时》（第一季）于2019年5月20日在央视纪录频道播出，首季《城市24小时》聚焦郑州、武汉、深圳、成都、厦门五座城市，以一天24小时为观察轴线，通过不同时间节点上真实和鲜活的生活图景，找寻每个城市独特的气质和个性；从司空见惯的日常琐事中还原被忽略的城市之美。原来是求顾涧帮忙的，板栗暗自点头。唯独周到一人对此既惊喜有惊疑，若非亲自体验他还真有些不大相信。A4.1 Routine Inspection Items大龄剩女白小美，终日幻想美丽浪漫的爱情，经历99次相亲依然孤身一人，终极屌丝王小帅，尝试各种‘泡妞秘籍’依然无所收获，此时，善良但是神经质的‘冒牌’天使出现，使出浑身解数帮助两只单身狗脱‘单’，魔法道具忘情水、颜值面膜、相亲APP等应有尽有，还有超级伪娘、风骚闺蜜、绝美人妖、智障老板轮番登场，眼看脱单成功在即，最终越帮越惨！令人捧腹大笑！由Gil Grissom领导的拉斯维加斯警局犯罪鉴证科夜班组的任务是深入案发现场寻找种种蛛丝马迹，并利用最先进的科技手段，把表面上没有任何联系、没有意义的线索拼凑成不可辩驳的证据，抽丝剥茧重组案情，让犯罪分子无处可逃……