在使用nodejs和express-generator设置我的应用程序时，我运行了
npm install multer --save
npm audit fix
在我的终端。然后当我试图跑步时
node ./bin/www
在我的终端中，它向我显示了此错误：
app.set('port'， port(;
^
类型错误：app.set 不是一个函数
我还没有使用过穆特。
正如本文所建议的，我要求表达并在应用程序末尾使用"module.exports = app".js并且在我运行上述命令之前它就起作用了，所以我真的无法弄清楚我的代码出了什么问题。
myapp/bin/www
#!/usr/bin/env node
/**
* Module dependencies.
*/
var app = require('../app');
var debug = require('debug')('myapp:server');
var http = require('http');
/**
* Get port from environment and store in Express.
*/
var port = normalizePort(process.env.PORT || '3000');
app.set('port', port);
/**
* Create HTTP server.
*/
var server = http.createServer(app);
/**
* Listen on provided port, on all network interfaces.
*/
server.listen(port);
server.on('error', onError);
server.on('listening', onListening);
/**
* Normalize a port into a number, string, or false.
*/
function normalizePort(val) {
var port = parseInt(val, 10);
if (isNaN(port)) {
// named pipe
return val;
}
if (port >= 0) {
// port number
return port;
}
return false;
}
/**
* Event listener for HTTP server "error" event.
*/
function onError(error) {
if (error.syscall !== 'listen') {
throw error;
}
var bind = typeof port === 'string'
? 'Pipe ' + port
: 'Port ' + port;
// handle specific listen errors with friendly messages
switch (error.code) {
case 'EACCES':
console.error(bind + ' requires elevated privileges');
process.exit(1);
break;
case 'EADDRINUSE':
console.error(bind + ' is already in use');
process.exit(1);
break;
default:
throw error;
}
}
/**
* Event listener for HTTP server "listening" event.
*/
function onListening() {
var addr = server.address();
var bind = typeof addr === 'string'
? 'pipe ' + addr
: 'port ' + addr.port;
debug('Listening on ' + bind);
}
应用.js
var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var logger = require('morgan');
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var productsRouter = require('./routes/products');
var adminRouter = require('./routes/admin');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use('/products', productsRouter);
app.use('/admin', adminRouter);
// DataBase
var mysql = require('mysql');
var db = mysql.createConnection({
host: 'localhost',
user: 'root',
password: '',
database: 'stylish'
});
db.connect(function(err) {
if (err) {
console.log('MySQL connection error: '+err.message);
return;
}
console.log('Connected to the MySQL server');
});
// 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;
module.exports = db;
在 aap 中.js您正在执行两次导出，因此 www 文件将作为对象接收
你需要像这样使用
var app = require('../app');
app=app.app
or
var app = require('../app').app; //recommended
or
app.app.set('port',port)