范围循环算法

import flash.events.MouseEvent;

var  arr:Array=[0,1,2,3,4,5,6,7];

var num:Number=0;
this.stage.addEventListener(MouseEvent.CLICK,handleMouseClick);
function handleMouseClick(e:MouseEvent):void
{
	num=(num+1)%arr.length;
	trace(num);
}

输出结果：

1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0

不错吧……