QQ获取TK 转换

 /// <summary>        /// 获取TK value        /// </summary>        /// <param name="str"></param>        /// <returns></returns>        private int getGTK(string str)        {            var hash = 5381;            for (int i = 0, len = str.Length; i < len; ++i)            {                hash += (hash << 5) + (int)str[i];            }            return hash & 0x7fffffff;        }