利用所给Face类画三个脸,添加move方法，以便能移动脸,添加flinch和unflinch方法使眼睛能闭合、睁开,最后完成一个动画程序：脸在窗口内移动，碰壁反弹-Face class to draw three face, adding the move methods, in order to be able to move the face to add flinch and unflinch of eyes closed, opened, and finally completed an animation program: face in the window move, run into a wall rebound