运用递归随机出与上一个数不重复的数

var count:int=0;
var randomNum:int;
function recursion():void
{
	randomNum = Math.round(Math.random() * 2 + 1);
	if (count != randomNum)
	{
		count = randomNum;
	}
	else
	{
		recursion();
	}
}