/// <summary>
        /// 开始补间
        /// </summary>

        static public TweenColor Begin(GameObject go, float duration, Color color)
        {
#if UNITY_EDITOR
            if (!Application.isPlaying)
            {
                return(null);
            }
#endif
            TweenColor comp = UITweener.Begin <TweenColor>(go, duration);
            comp.from = comp.value;
            comp.to   = color;

            if (duration <= 0f)
            {
                comp.Sample(1f, true);
                comp.enabled = false;
            }
            return(comp);
        }