[]使用createFrames创建的图集动画。如何单独修改这个缓存动画播放速度

/**

   * 角色创建

   */

  public function init(interval,type:String,hp:Number,speed:Number,hitRadius:Number,camp:Number,heroType:Number = 0):void 

  {

   //初始化属性

   this.type = type;

   this.hp = hp;

   this.speed = speed;

   this.hitRadius = hitRadius;

   this.camp = camp;

   this.heroType = heroType;

    

   if(!Role.cacheAs)

   {

    Role.cacheAs = true;

    //缓存飞机飞行动画

    Animation.createFrames(["war/hero_fly1.png", "war/hero_fly2.png"], "hero_fly");

    //缓存飞机死亡动画

    Animation.createFrames(["war/hero_down1.png", "war/hero_down2.png", "war/hero_down3.png", "war/hero_down4.png"], "hero_down");

    //缓存敌机1飞行动画

    Animation.createFrames(["war/enemy1_fly1.png"], "enemy1_fly");

    //缓存飞机1死亡动画

    Animation.createFrames(["war/enemy1_down1.png", "war/enemy1_down2.png", "war/enemy1_down3.png", "war/enemy1_down4.png"], "enemy1_down");

    //缓存敌机2飞行动画

    Animation.createFrames(["war/enemy2_fly1.png"], "enemy2_fly");

    //缓存飞机2死亡动画

    Animation.createFrames(["war/enemy2_down1.png", "war/enemy2_down2.png", "war/enemy2_down3.png", "war/enemy2_down4.png"], "enemy2_down");

    //缓存飞机2击中动画

    Animation.createFrames(["war/enemy2_hit.png"], "enemy2_hit");

    //缓存敌机3飞行动画

    Animation.createFrames(["war/enemy3_fly1.png"], "enemy3_fly");

    //缓存飞机3死亡动画

    Animation.createFrames(["war/enemy3_down1.png", "war/enemy3_down2.png", "war/enemy3_down3.png", "war/enemy3_down4.png"], "enemy3_down");

    //缓存飞机3击中动画

    Animation.createFrames(["war/enemy3_hit.png"], "enemy3_hit");

    //缓存子弹动画

    Animation.createFrames(["war/bullet1.png"], "bullet1_fly");

    //缓存强化道具

    Animation.createFrames(["war/ufo1.png"], "ufo1_fly");

    //缓存医疗包

    Animation.createFrames(["war/ufo2.png"], "ufo2_fly");

    

   }

   if (!body){

    //创建动画作为飞机的身体

    body = new Animation();

    //动画播放时间间隔

    body.interval = interval;

    //将动画加入到容器中

    this.addChild(body);

     //增加动画播放完成监听

    body.on("complete", this, this.onPlayComplete);

   }

   //播放当前状态的动画

   this.playAction("fly");

  }