public override void OnUse(CharacterCard toCard, string skillAppendData)
    {
        JsonData skillData = JsonMapper.ToObject(skillAppendData);
        int damage = Convert.ToInt32(skillData["damage"].ToString());
        int energy = Convert.ToInt32(skillData["energy"].ToString());

        toCard.ExpendEnergy(energy);//消耗能量
        toCard.GetDamage(damage);//造成伤害
    }