窗口中的数字显示了窗口创建的先后顺序

![tile 瓷砖](http://1.bp.blogspot.com/_oKL9t7fM3TU/SYW7JK1ZVJI/AAAAAAAAAkw/Fnym7L_TgRk/s400/tile.png =360x240)
![tileleft 瓷砖放在左边](http://3.bp.blogspot.com/_oKL9t7fM3TU/SYW7JJrrk-I/AAAAAAAAAko/SoUQgLiZa9I/s400/tileleft.png =360x240)
![tilebottom 瓷砖放在底部](http://3.bp.blogspot.com/_oKL9t7fM3TU/SYW6pzWYriI/AAAAAAAAAkg/cYgul2v1EtY/s400/tilebottom.png =360x240)
![tiletop 瓷砖放在顶部](http://1.bp.blogspot.com/_oKL9t7fM3TU/SYW6pxbyAqI/AAAAAAAAAkY/N9cjEbnYhtw/s400/tiletop.png =360x240)
![fairh 水平分割](http://2.bp.blogspot.com/_oKL9t7fM3TU/SYW6pvrUOmI/AAAAAAAAAkI/Kl3Z1a3tIjs/s400/fairh.png =360x240)
![fairv 垂直分割](http://2.bp.blogspot.com/_oKL9t7fM3TU/SYW6p-7vg9I/AAAAAAAAAkQ/JtmG74JqAow/s400/fairv.png =360x240)
![magnifier 放大镜](http://4.bp.blogspot.com/_oKL9t7fM3TU/SYW6pvXWfbI/AAAAAAAAAkA/AlKJJlYFchs/s400/magnifier.png =360x240)
![spiral 螺旋](http://2.bp.blogspot.com/_oKL9t7fM3TU/SYW7JZ35g9I/AAAAAAAAAlA/au0LkOQgJkM/s400/spiral.png =360x240)
![dwindle 衰退](http://3.bp.blogspot.com/_oKL9t7fM3TU/SYW7JcBCHDI/AAAAAAAAAk4/XVGRhdCzBzQ/s400/dwindle.png =360x240)