家庭老师一边讲课

Is there any variable, constant, or data type in the code that is not defined or referenced18岁的平凡女生杉菜转入了精英学校英德大学却与同学们格格不入。学校里有四个外形阳光帅气，家境富裕的学生：道明寺，花泽类，西门和美作。因为杉菜看不惯道明寺飞扬跋扈的模样，仗义的杉菜与他产生了争执，从此之后，道明寺常常恶作剧作弄杉菜。之后一系列的事情发生，使杉菜与道明寺之间的误会逐渐的加深。但每到危急时刻，花泽类都会出现帮助杉菜并帮其解围。杉菜凭借其杂草般顽强的生命力逐渐改变了这四个男生对其不好的印象，与他们的关系也逐渐缓和，变成了朋友，从平凡女生变成了全校同学的榜样。道明寺也因为在恶作剧杉菜的过程中，被她不屈不挠的乐观天性所吸引，不知不觉的爱上了杉菜。两个人经历了重重阻碍，最终走在了一起，收获了爱情。　　春桃What is the meaning of life? This problem has undoubtedly become an unsolved ultimate problem.谁要是害他们当不好王爷和公爷，哼哼。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.3. The code in the policy mode can be reused.