/// <summary>
        ///   过滤数据
        /// </summary>
        /// <param name="_str"></param>
        /// <returns></returns>
        public string strreplace(string _str) 
        {
            _str = _str.Trim().Replace("\n", @"<br>").Replace("\t", @"").Replace("\f", @"").Replace("\v", @"");
            return _str;
        }