编的一个小电梯，可以实现基本的电梯运行，比如在上升的时候，楼下的人按了，电梯还是会先上去到达用户需要的楼层再下来-Compiled by a small elevator，Can realize the basic operation of the lift, for example, in the rising, and the downstairs press the elevator or up the floor to reach the user needs and then down