多选状态切换>>多个选项中选一个,选中状态的切换 

    GameObject lastSelect;//上一次选中
    public void OnCharacterClick(GameObject currSelect)
    {
        if (lastSelect && currSelect == lastSelect)//当前选择和上一次相同不做处理
        {
            return;
        }
        iTween.ScaleTo(currSelect,Vector3.one *2,0.5f); //把选中物体放大2倍
        if (lastSelect)//把上一次物体缩小,如果有的话
        {
            iTween.ScaleTo(currSelect,Vector3.one,0.5f);
        }
        lastSelect = currSelect;//当前选中保存到上一次选中变量中
    }