/// <summary>
    /// 根据id设置bullet的形状
    /// </summary>
    /// <param name="luaState"></param>
    /// <returns></returns>
    public static int SetBulletStyleById(ILuaState luaState)
    {
        EnemyBulletBase bullet = luaState.ToUserData(-2) as EnemyBulletBase;
        string          id;

        if (luaState.Type(-1) == LuaType.LUA_TNUMBER)
        {
            id = luaState.ToNumber(-1).ToString();
        }
        else
        {
            id = luaState.ToString(-1);
        }
        bullet.SetStyleById(id);
        return(0);
    }