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In this tutorial you will learn how make explosions with your enemies. You'll learn how to make the explosion animation.

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timeline code

var sfx_gun:Sound = new sfx();
var sp:MovieClip = new ship();
var tm:Timer = new Timer(1500);

tm.addEventListener(TimerEvent.TIMER, onstart);

var bulletholder:Sprite = new Sprite();

addChild(bulletholder);

addChild(sp);

addEventListener(Event.ENTER_FRAME,onenter);
stage.addEventListener(MouseEvent.CLICK,onclick);

tm.start();
function onstart(e:Event){
 
 
 var em:Sprite = new enemy();
 em.x= Math.random()*550;
 addChild(em);
 
 
 }


function onenter(e:Event):void {
 sp.x-=(sp.x-mouseX)*.1;
 sp.y-=(sp.y-350)*.2;
}

function onclick(e:Event) {
 sfx_gun.play();
 sp.y=365;
 var bl:Sprite = new bullet();
 bl.y=sp.y;
 bl.x=sp.x;
 bulletholder.addChild(bl);
}

enemy class

package {
 
 import flash.events.Event;
 import flash.display.MovieClip;
 import flash.display.Sprite;
 
 public class enemy extends Sprite {
  private var core:Object;
  
  public function enemy() {
   addEventListener(Event.ADDED_TO_STAGE,onadd);
  }

  private function onadd(e:Event) {
   core=MovieClip(root);
   addEventListener(Event.ENTER_FRAME,loop);
  }

  private function loop(e:Event) {
   y+=3;
   
   //var dis:Number = Math.abs(y-core.sp.y)/20;
   //bd.htmlText='<font color="#ffffff">'+dis+'</font>';
   //y-=((y-core.sp.y)/dis);
   //x-=((x-core.sp.x)/dis);
   
   for (var i:int = 0; i<core.bulletholder.numChildren; i++) {
    var bulletTarget:Sprite=core.bulletholder.getChildAt(i);
    if (hitTestObject(bulletTarget)) {
     core.bulletholder.getChildAt(i).removeListeners();
     core.bulletholder.removeChild(bulletTarget);
     
     var boom:MovieClip = new explosion();
     boom.x=x;
     boom.y=y;
     stage.addChild(boom);
     
     removeEventListener(Event.ENTER_FRAME, loop);
     core.removeChild(this);
    }
   }

  }

  public function removeListeners():void {
   removeEventListener(Event.ENTER_FRAME, loop);
  }
 }
}

bullet class

package {
 import flash.display.Sprite;
 import flash.events.Event;

 public class bullet extends Sprite {

  private var sw:Number;
  private var sh:Number;
  private const _SPEED:int=10;
  private const _OFFSTAGE:int=-10;

  public function bullet():void {
   addEventListener(Event.ADDED_TO_STAGE,onadd);
  }

  private function onadd(e:Event):void {
   sw=stage.stageWidth;
   sh=stage.stageHeight;
   addEventListener(Event.ENTER_FRAME,loop);
  }

  private function loop(e:Event):void {
   if (y<_OFFSTAGE) {
    removeEventListener(Event.ENTER_FRAME,loop);
    parent.removeChild(this);
   }
   y-=_SPEED;
  }

  public function removeListeners():void {
   removeEventListener(Event.ENTER_FRAME,loop);
   
  }
 }
}

explosion class

package {
 import flash.display.MovieClip;
 import flash.events.Event;
 import flash.media.Sound;
 public class explosion  extends MovieClip {
private var hit:Sound = new sfx_hit();
  public function explosion() {
   addEventListener(Event.ENTER_FRAME,xkill);
   hit.play();
  }

  private function xkill(e:Event) {
   if (currentFrame==framesLoaded) {
    
    removeEventListener(Event.ENTER_FRAME,xkill);
    parent.removeChild(this);
   }
  }
 }
}

On Enter Flash: Sprite

Adobe flash cs4 Game tutorial Explosion