/// <summary>
        /// 淡出并移除背景
        /// </summary>
        /// <param name="time">淡出时间</param>
        public static Queue <ImageEffect> FadeOutBackground(float time)
        {
            AnimationBuilder builder = new AnimationBuilder();
            UI2DSprite       ui      = EffectBuilder.backgroundSprite;

            return(builder.BeginWith(EffectBuilder.FadeOut(ui, time)).Then(EffectBuilder.RemoveSprite(ui)).Get());
        }