关于事件机制的理解

package
{
	import flash.events.Event;
	
	
	public class NBEEvent extends Event
	{
		/**
		 * 对
		 */
		public static const RIGHT: String = "nbe_event_right";
		
		
		
		public function NBEEvent(type: String, bubbles: Boolean = true, cancelable: Boolean = false)
		{
			super(type, bubbles, cancelable);
		
		}
		
		public override function clone(): Event
		{
			return new NBEEvent(type, bubbles, cancelable);
		}
		
		public override function toString(): String
		{
			return formatToString("NBEEvent", "type", "bubbles", "cancelable", "eventPhase");
		}
	
	}

}

import NBEEvent;
import flash.events.MouseEvent;

btn.addEventListener(MouseEvent.CLICK,onClick);
function onClick(e:MouseEvent)
{
	dispatchEvent(new NBEEvent(NBEEvent.RIGHT,false,false));
}

import NBEEvent;
m1.addEventListener(NBEEvent.RIGHT,_onRW,false,0,true);
function _onRW(e:NBEEvent)
{
	trace(e.type)
}