?class Step {
	//m,n表示兩個坐標(biāo)值 
	public var m:Number;
	public var n:Number;
	//side表示下子方 
	public var side:Number;
	//棋子編號
	public var id:Number;
	public function Step() {
		this.m = -1;
		this.n = -1;
		this.side = 0;
		this.id = 0;
	}
}