无法导出功能

Posted 2023-03-10

????????????

??????:Can not export function

??????:2019-10-27 19:11:52

??????:

???????:

exports.get = async function (req, res, next) 
  filter.validateId(req,res,next);
  const db = req.app.get('db');
  let id = req.params.id;
  let user;
  try 
    user = await db.models.user.findByPk(id);
   catch (err) 
    res.send(400)
  
  res.json(user);
;

?????:

var validateId = function (req, res, next) 
  let id = parseInt(req.params.id);
  if (isNaN(id) || id <= 0) 
      res.send(400);
  
  res.locals.id = id;

  return next();
;
exports.validateId=validateId;

???????:

GET /users/203 404 17.862 ?? - 90

(node:20775) UnhandledPromiseRejectionWarning: ?? [ERR_HTTP_HEADERS_SENT]: ????????????? ? ServerResponse.setHeader (_http_outgoing.js:470:11) ? ServerResponse.header (/home/qt/dev/BigDealExpressJSTest/node_modules/express/lib/response.js:767:10) ? ServerResponse.send (/home/qt/dev/BigDealExpressJSTest/node_modules/express/lib/response.js:170:12) ? ServerResponse.json (/home/qt/dev/BigDealExpressJSTest/node_modules/express/lib/response.js:267:15) ?exports.get (/home/qt/dev/BigDealExpressJSTest/controllers/userController.js:28:7) (??:20775)UnhandledPromiseRejectionWarning:????????????????? catch ?????????????,?????? .catch() ?????? (????:1) (??:20775)[DEP0018] DeprecationWarning:????????????????,???? Promise ????????????? Node.js ???

??????:

??Cannot set headers after they are sent ???????????,?????validateId ?,???res.json(user)

??,??? if,???????? UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1) (node:21582) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

?????1?:

??????????:

??:

if (isNaN(id) || id <= 0) 
      res.send(400); //return res.send(400);

????return,??????????next()???????

????????:

?validateId ?,?????get ???next???,???? validateId ?? next ?,???????? next ? get,??????????????????

??,???? get ????? filter.validateId(req,res,next); ??????????????

??

exports.get = async function (req, res, next) 
  const db = req.app.get('db');
  let id = req.params.id;
  let user;
  try 
    user = await db.models.user.findByPk(id);
   catch (err) 
    res.send(400)
  
  res.json(user);
;

app.get('/route', validateId, get , (req,res)=>.. do something ) ?app.get('/route', validateId, get)

????: