关于node js express框架中的路由定义

我正在 app.js 文件中设置路由。我正在通过 routes/flights.js 文件中的航班列表的路线。但是当我在所有路由的底部定义路由时我面临的问题是我收到 404 错误但是我在所有路由的顶部传递了相同的路由定义然后它正在工作。请帮我处理下面给出的两个文件的代码。提前致谢。

app.js 文件：

var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var flightRouter = require('./routes/flight');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(function(req, res, next){
  res.set('X-Powered-By', 'Flight Tracker');
  next();
});
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use('/flight', flightRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;

路线/flight.js

var express = require('express');
var router = express.Router();
var flights = require('../modules/data');
var flight = require('../modules/flight');

for (var number in flights) {
    flights[number] = flight(flights[number]);
}

router.get('/list', function (req, res, next) {
    // console.log('in list');
    res.render('flight', {
        title: 'All flights',
        flights: flights
    });
});

router.get('/:id', function (req, res, next) {
    var number = req.params.id;
    if (typeof flights[number] === 'undefined') {
        res.status(404).json({
            status: 'error'
        });
    } else {
        res.json(flights[number].getInformation());
    }
});

router.put('/:id/arrived', function (req, res, next) {
    var number = req.params.id;
    if (typeof flights[number] === 'undefined') {
        res.status(404).json({
            status: 'error'
        });
    } else {
        flights[number].triggerArrive();
        res.json({
            status: 'Done'
        });
    }
});


module.exports = router;

router.get('/list', function (req, res, next) {
    res.render('flight', {
        title: 'All flights',
        flights: flights
    });
});

上面这行代码需要在 routes/flight.js 中其他路由的底部工作