//string strText = "1334677999";實現(xiàn)無重復(fù)
        public static string qu(string lab)
        {
            string strResult = string.Empty;
            for (int intIdx = 0; intIdx lab.Length; intIdx++)
            {
                if (strResult.IndexOf(lab.Substring(intIdx, 1)) 0)
                {
                    strResult += lab.Substring(intIdx, 1);
                }
            }
            return strResult;
        }