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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.Http://www.jiemian.com/article/2007883.html 讲述了一个20岁新生的大学生都会经历的不受约束的"人性"故事。It is a men's competition. There are two versions of its origin. One is that it originated in Britain and evolved from a children's game in Britain. It was then introduced into the United States by British immigrants and gradually became the national ball of the United States ". The other is that it originated in the United States.The BBC documentary "Seven Years of Life" confirmed this phenomenon. They followed a group of children from different classes for 49 years and finally revealed a cruel fact: the vast majority of the children of the poor are still poor, the vast majority of the children of the rich are still rich, and the classes have been passed down from generation to generation.3. Destroy Shooting Power Ratio　　小提琴的流浪从未间断，从盗墓者，到吉普赛人，到为之自杀的作曲家波普，再到文革期间上海的一位音乐老师。这期间，无论拥有者是否明白小提琴真正价值，都逃不出它的魔力。终于，有鉴别专家知道了小提琴的秘密——它的外壳染着三个世纪前一位大师的血和泪。