Javascript 如何在express Router.route和controller模式中触发next（）？

在请求到达我的一个api路由之后，我似乎不知道如何实现“next（）”。我希望在完成所有事情之后，而不是在我的api路由之前进行日志记录。我已经在我的路由上实现了控制器模式。我现在只能记录错误，但我想记录所有请求：

//------ api/index.js
import routes from './routes/index.route';

app.use('/api', routes);


// ??? HOW TO HANDLE next() called in "/api routes"
// only handles incoming requests not found in "/api routes"
app.use((req, res, next) => {
  // logic here...
  next(error);
});


// global error handler
app.use((error, req, res, next) => {
  // logging logic here...
});



//------ routes/index.route.js
import express from 'express';
import userRoutes from './user.route';
import bookRoutes from './book.route';

const router = express.Router();

router.use('/user', userRoutes);
router.use('/book', bookRoutes);



//------ routes/book.route.js
import express from 'express';
import bookCtrl from './../controllers/book.controller';

const router = express.Router();
router.route('/:bookId').get(bookCtrl.getBook);




//------ controllers/book.controller.js
export const getBook = async (req, res, next) => {
  const book = // get book logic here;

  return res.status(httpStatus.OK).json(book);

  // HOW DO I TRIGGER next()?  
  // I tried this approach as well: 

  // res.status(httpStatus.OK).json(book);
  // next();

  //however, it would say, "Error: Can't set headers after they are sent."
}

非常感谢您。

请更换

 return res.status(httpStatus.OK).json(book);
 // HOW DO I TRIGGER next()? 

与

---

它会起作用。

我找到了一种触发next的方法，即不立即发送响应，而是将其分配给res.locals并调用next。以下是基于我的上述代码所做的更改：

//------ api/index.js
// handle next() event coming from "/api routes"
// and also handles incoming requests not found in "/api routes"
app.use((req, res, next) => {
  if (res.locals.status) {
    const { status, responseData } = res.locals;
    res.status(status).json(responseData);
    // logging logic here...
  } else {
    // error logic here...
    // forward this error into the global error handler
    next(error);
  }
});



// controllers/book.controller.js
export const getBook = async (req, res, next) => {
  // get book logic here..
  const book = // get book logic here;

    res.locals = {
      status: httpStatus.OK,
      responseData: {
        book,
      },
    };

    next();
}

---

感谢@destoryer提供res.json提示：）

试着调用它？我想他是在用javascript而不是JQueryAllso问，“应该删除前一行中的

return

。@whoami这个答案与jquery没有任何关系。@Jonas W，我已经试过了，它会说‘错误：发送后无法设置标题’：（@Woppi

json（）。
//------ api/index.js
// handle next() event coming from "/api routes"
// and also handles incoming requests not found in "/api routes"
app.use((req, res, next) => {
  if (res.locals.status) {
    const { status, responseData } = res.locals;
    res.status(status).json(responseData);
    // logging logic here...
  } else {
    // error logic here...
    // forward this error into the global error handler
    next(error);
  }
});



// controllers/book.controller.js
export const getBook = async (req, res, next) => {
  // get book logic here..
  const book = // get book logic here;

    res.locals = {
      status: httpStatus.OK,
      responseData: {
        book,
      },
    };

    next();
}