AS3:

?View Code ACTIONSCRIPT
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var i:int;
function onMouseWheelHandler(e:MouseEvent):void{
        i+=e.delta>0?1:-1
        trace(i);
}
this.stage.addEventListener(MouseEvent.MOUSE_WHEEL ,onMouseWheelHandler);

AS3文档类：

?View Code ACTIONSCRIPT
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package {
	import flash.events.MouseEvent;
	import flash.display.MovieClip;
	public class Main extends MovieClip {
		public var i:int;
		public function Main() {
			this.stage.addEventListener(MouseEvent.MOUSE_WHEEL ,onMouseWheelHandler);
		}
		public function onMouseWheelHandler(e:MouseEvent):void {
			i += e.delta > 0 ? 1:-1;
			trace(i);
		}
	}
}