/// <summary>
        /// 去除超链接标记
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string DelLink(string str)
        {
            if (str != null && str.Trim() != "")
                return Regex.Replace(str, "(<a[^>]+>)|(</a *>)", "");
            return str;
        }