在窗口中显示26个英文字母，从左向右依次将字母位置提高10个像素单位，并且颜色变为红色，然后回到正常位置；当到达最右端后改变方向，从右向左依次变成红色并将位置提高10个像素单位。然后恢复正常。-In the window display 26 letters of the alphabet, followed by the letters from left to right position to raise 10 pixel units, and the color turns red, and then back to the normal position　When reaching the far right after the change in direction, from right to left turn into red and the location of units increased by 10 pixels. And then back to normal.