anchor.diff:    } else {
       request.response
         ..writeln('not exit')
  -      ..close();//没猜对的话回复false
  -  }
  -}
  -
  +      ..close();//该同学不存在的话显示not exit
  +  }
  +}
  +*/
  
positive.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);
  
negative.code:   } else {
      request.response
        ..writeln('not exit')
        ..close();//该同学不存在的话显示not exit
    }
    if (selectinfo == '1002yu') {
      request.response
  