AS3 点击产生的圆

//pzx1.as

package
{
 import flash.display.Sprite;
 import flash.events.Event;
 import flash.events.MouseEvent;
 public class pzx1 extends Sprite
 {
  var n1:Number;
  var n2:Number;

  public function pzx1()
  {
   into(n1,n2);
  }
  public function into(n1,n2):Sprite
  {

   var sp:Sprite = new Sprite();

   sp.graphics.beginFill(0xffffff*Math.random());
   sp.graphics.drawCircle(n1,n2,10+10*Math.random());
   sp.graphics.endFill();
   sp.alpha = 0.5 + Math.random();
   return sp;
  }
 }

}

//pzx1x1.fla

import pzx1;
import flash.events.MouseEvent;
var dd:pzx1= new pzx1();
stage.addEventListener(MouseEvent.CLICK,px);
function px(evt:MouseEvent):void
{
 var t1:Number = mouseX;
 var t2:Number = mouseY;
 addChild(dd.into(t1,t2));
}