class com.sam {
	// 罗列MC中指定层级的所有MC
	public function traceContent(mClip:MovieClip, nLevel:Number):Void {
		for (var sItem in mClip) {
			if (mClip[sItem] instanceof MovieClip) {
				if (String(mClip[sItem]).split(".").length>nLevel) {
					trace(mClip[sItem]);
					traceContent(mClip[sItem], nLevel+1);
				}
			}
		}
	}
	// 求数组中所有元素的平均数
	public function average(Arr:Array):Number {
		var totalArr:Number = 0;
		var i:Number;
		for (i in Arr) {
			totalArr += Arr[i];
		}
		return Math.floor(totalArr/Arr.length);
	}
}