说明：  用键盘、按键、八段码和LED模拟电梯的工作过程。楼层设为8层，键盘数字键1～8用来键入希望停的楼层，8个LED希望停的楼层，八段码指示电梯当前所在楼层，按钮用来启、停电梯。电梯正常运行时以每2秒1层的速度上升或下降
(Using keyboard, keys, eight LED simulation code and the working process of the lift. Set 8-storey floors, keyboard number keys 1 to 8 for the type want to stop the floor, 8 LED hope to stop the floor, eight yards instructions current floor elevator button for Kai stopped elevator. The normal operation of the lift when a layer 2 seconds per speed increase or decrease)