AS3.0实现淡入淡出效果

package ch13_1
{
	import fl.transitions.*;
	import fl.transitions.easing.*;
	
	import flash.display.Graphics;
	import flash.display.MovieClip;
	import flash.display.Sprite;
	import flash.events.MouseEvent;

	public class FadeText extends MovieClip
	{
		var cv:MovieClip = new MovieClip();
		public function FadeText()
		{
			
			var g:Graphics = cv.graphics;
			for(var i:uint =0;i<15;i++)
			{
				g.beginFill(0xFFFFFF*Math.random());
				g.drawCircle(0,0,(150-i*10));
				g.endFill();
			}
			addChild(cv);
			cv.x =stage.stageWidth/2;
			cv.y = stage.stageHeight/2;
			stage.addEventListener(MouseEvent.CLICK,change);
			
		}
		private function change(e:MouseEvent):void
		{
			TransitionManager.start(cv,{type:Fade,direction:Transition.IN,duration:2,easing:Strong.easeIn});
		}
	}
}