anchor.diff:        ' ${userName_tea}'
     );
   }
  -
  +/*
   Future<shelf.Response> _echoRequest(shelf.Request request) async {
     //接受post过来的数据
     String content = await request.readAsString();
  
positive.code:   } else {
      request.response
        ..writeln('not exit')
        ..close();//没猜对的话回复false
    }
    if (selectinfo == '1002yu') {
      request.response
  
negative.code:   // myRouter.get('/', responseRoot);
    // myRouter.get('/login', forlogin);
    //myRouter.get('/no_login', forno_login);
   /* myRouter.get('/search',forsearch);*/
    myRouter.get('/student/{stuid_x}', forstuid);
    myRouter.get('/teacher/{teaid_x}', forteaid);
    //myRouter.get('/teacher/{teaid_x}/student/{stuid_m}', forteasearch);
  