anchor.diff:      clubuser.add('${row[0]}');
     });
     print(clubuser);
  -}
  ->>>>>>> origin/master
  +}
positive.code:       //request.response.close();
        print(club_send);
        club_send=[];
        if (jsondata!=""){
          await clubsql();
        await request.response.write(JSON.encode(clubuser));
         // ..headers.contentType = new ContentType("application", "json", charset: "utf-8");
         request.response.close();}
  
negative.code: var jsondata;
  //全局变量，用于接收客户端传来的数据。
  List my_email=[];
  List club_send=[];
  List clubuser=[];
  main() async {
  
    var server = await HttpServer.bind(InternetAddress.LOOPBACK_IP_V4, 8080);
  