public static string CleanHtml(string strHtml)
        {
            strHtml = Regex.Replace(strHtml, @"(\<script(.+?)\</script\>)|(\<style(.+?)\</style\>)", "", RegexOptions.IgnoreCase | RegexOptions.Singleline);
            //删除标签
            var r = new Regex(@"</?[^>]*>", RegexOptions.IgnoreCase);
            Match m;
            for (m = r.Match(strHtml); m.Success; m = m.NextMatch())
            {
                strHtml = strHtml.Replace(m.Groups[0].ToString(), "");
            }
            return strHtml.Trim();
        }