这是一个可以随机滚动的点名器，要求是：在名为stu2的文件里添加12位学号+姓名，并以换行为分隔。图片以12位学号命名-This is a random rolling roll call, the requirements are: in named stu2 file to add 12 school+ name, and separated in order to change behavior. The naming of the picture to 12 school