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Although the above code can meet the requirements, it is not easy to expand and difficult to read. If I want one or two conditions in the future, if I want to recharge 300 yuan successfully, I can win the 150 yuan red envelope, then I have to change the code inside at this time, so the coupling between business logic and code is relatively high, and I accidentally correct the wrong code. At this time, we try to use the responsibility chain mode to transfer objects in turn to realize it.Let me explain the role of these classes: MySubject class is our main object, Observer1 and Observer2 are objects that depend on MySubject, and Observer1 and Observer2 must change when MySubject changes. The AbstractSubject class defines a list of objects to be monitored, which can be modified: add or delete monitored objects, and when MySubject changes, it is responsible for notifying the objects that exist in the list. Let's look at the implementation code:延续第一季的剧情，讲述了立志35岁提前退休的辛凡才刚踏出第一步就被现实打败了，花千金也面临店铺经营困扰无暇顾及感情......越来越多有趣的人，加入了这个热闹的小团体，这群年轻人依旧续写着他们的生活，继续上演着关于爱、温暖、奋斗与成长的故事。短片集由四位导演联合执导。有一晚，小小兔在梦中来到一个森林，在森林中的湖上，她见到纯白色、有角和翼的独角天马。日全食的那一天，一座神秘的马戏团从天而降。之后不久，一群专门袭击拥有美丽梦想的敌人出现了，他们是亚马逊三重奏——老虎眼、秃鹰眼、美鱼眼。敌人的目的是要找寻躲藏在某人美丽梦想之内的独角天马。因为圣杯在上次大战中被毁，水手月亮在第四部前几集无法进行二段变身，面对力量比她强的敌人，显得束手无策。水手小月亮很想要新的力量，此时独角天马出现，用它头上的黄金水晶，赐予水手月亮和水手小月亮新力量，使她们变成超级水手月亮和超级水手小月亮，守护大家的梦想。水手月亮的新必杀技虽然强劲，但每次都必须由水手小月亮呼唤独角天马，才可以借助黄金水晶的力量，和敌人战斗。　　五年后的洛熙成了拥有无数FANS的天王巨星，夏沫与他再次相遇，在演艺圈中两人再续前缘，夏沫与洛熙的发展耀眼动人、令人忌妒羡慕。但这看似美好的世界，随着欧辰恢复记忆而崩塌，他要抢回夏沫，并以把肾给小澄作为条件让夏沫嫁给他。 　At the Shanghai Microsatellite Engineering Center, Li Qiang also expressed a similar meaning: "We should focus on key areas, strengthen research on major common technologies and key core technologies, strive to make great progress in basic science and technology fields, achieve major breakthroughs in key core technology fields, gather and drive a number of related industrial chain enterprises, and push the manufacturing industry forward to the middle and high end."