/// <summary>
        /// 根据ulr读出html
        /// </summary>
        static string GetHtml(string url)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream stream = response.GetResponseStream();
            StreamReader sReader = new StreamReader(stream, Encoding.Default);
            string html = sReader.ReadToEnd().Replace("\r\n", "");
            response.Close();
            Console.WriteLine(html);
            return html;
        }