anchor.diff:        'server susscefullly get the post data from client is: "${content}');
   }
   ///教师可根据学生的姓名学号，进行选择，从而知道学生的具体成绩信息
  -
  -
  +forsearch(request)
  +{
  +  try {//try是什么意思？
  +    if (request.method == 'GET') {
  +      handleSearch(request);//42
  +    } else {
  +      request.response
  +        ..statusCode = HttpStatus.METHOD_NOT_ALLOWED
  +        ..write('Unsupported request: ${request.method}.')
  +        ..close();
  +    }
  +  } catch (e) {
  +    print('Exception in handleRequest: $e');
  +  }
  +  print('Request handled.');
  +}
  +void handleSearch(HttpRequest request) {
  +  var selectinfo = request.uri.queryParameters['q'];//应该是与HTML有关系
  +  request.response.statusCode = HttpStatus.OK;
  +  if (selectinfo == '1001hua') {
  +    request.response
  +      ..writeln('ok');
  +  } else {
  +    request.response
  +      ..writeln('not exit')
  +      ..close();//没猜对的话回复false
  +  }
  +  if (selectinfo == '1002yu') {
  +    request.response
  +      ..writeln('ok');
  +  } else {
  +    request.response
  +      ..writeln('not exit')
  +      ..close();//没猜对的话回复false
  +  }
  +  if (selectinfo == '1003qing') {
  +    request.response
  +      ..writeln('ok');
  +  } else {
  +    request.response
  +      ..writeln('not exit')
  +      ..close();//没猜对的话回复false
  +  }
  +  if (selectinfo == '1004li') {
  +    request.response
  +      ..writeln('ok');
  +  } else {
  +    request.response
  +      ..writeln('not exit')
  +      ..close();//没猜对的话回复false
  +  }
  +}
  +
  
positive.code:     db: 'teamfive',
      max: 5); //与数据库相连
  Future main(List<String> args)async {
      var myRouter = router();
     // myRouter.get('/', responseRoot);
     // myRouter.get('/login', forlogin);
      //myRouter.get('/no_login', forno_login);
      myRouter.get('/student/{stuid_x}', forstuid);
      myRouter.get('/teacher/{teaid_x}', forteaid);
      //myRouter.get('/teacher/{teaid_x}/student/{stuid_m}', forteasearch);
  Map <String, String> corsHeader = new Map();
  corsHeader["Access-Control-Allow-Origin"] = "*";
  corsHeader["Access-Control-Allow-Methods"] = 'POST,GET,OPTIONS';
  corsHeader['Access-Control-Allow-Headers'] =
  'Origin, X-Requested-With, Content-Type, Accept';
  var routerHandler = myRouter.handler;
  var handler = const shelf.Pipeline()
      .addMiddleware(shelf.logRequests())
      .addMiddleware(
      shelf_cors.createCorsHeadersMiddleware(corsHeaders: corsHeader))
      .addHandler(routerHandler);
  io.serve(handler, '127.0.0.1', 8080).then((server) {
  print('Serving at http://${server.address.host}:${server.port}');
  });
  /*
      forteasearch(request)
      {
  
negative.code: }
  
  Future<shelf.Response> forteaid(shelf.Request request) async {
    //从数据库获取数据
    String userName_tea = await getDataFromDb_tea();
  
    //把这个post过来的数据有返回给客户端
    return new shelf.Response.ok(
        ' ${userName_tea}'
    );
  }
  
  Future<shelf.Response> _echoRequest(shelf.Request request) async {
    //接受post过来的数据
  