Nodejs + certbot + expressJS - 錯誤：找不到模塊'socket.io'？

Question

我已經安裝了socket.io全球因爲這樣回答說：

npm install -g socket.io 

但爲什麼我仍然得到錯誤：

www-0 (err):  at Function.Module._load (module.js:388:25) 
www-0 (err):  at Function._load (/usr/lib/node_modules/pm2/node_modules/pmx/lib/transaction.js:62:21) 
www-0 (err):  at Module.require (module.js:468:17) 
www-0 (err):  at require (internal/module.js:20:19) 
www-0 (err):  at Object.<anonymous> (/usr/local/chroot/my-express-app/bin/www:146:11) 
www-0 (err):  at Module._compile (module.js:541:32) 
www-0 (err):  at Object.Module._extensions..js (module.js:550:10) 
www-0 (err):  at Module.load (module.js:458:32) 
www-0 (err):  at tryModuleLoad (module.js:417:12) 
www-0 (err): Error: Cannot find module 'socket.io' 
www-0 (err):  at Function.Module._resolveFilename (module.js:440:15) 
www-0 (err):  at Function.Module._load (module.js:388:25) 
www-0 (err):  at Function._load (/usr/lib/node_modules/pm2/node_modules/pmx/lib/transaction.js:62:21) 
www-0 (err):  at Module.require (module.js:468:17) 
www-0 (err):  at require (internal/module.js:20:19) 
www-0 (err):  at Object.<anonymous> (/usr/local/chroot/my-express-app/bin/www:146:11) 
www-0 (err):  at Module._compile (module.js:541:32) 
www-0 (err):  at Object.Module._extensions..js (module.js:550:10) 
www-0 (err):  at Module.load (module.js:458:32) 
www-0 (err):  at tryModuleLoad (module.js:417:12) 

這是我斌/ WWW：

#!/usr/bin/env node 

/** 
* Module dependencies. 
*/ 

var app = require('../app'); 
var debug = require('debug')('mongoose-iot:server'); 
var http = require('http'); 

// Add HTTPS support. 
// https://www.hacksparrow.com/express-js-https.html 
// http://stackoverflow.com/questions/11744975/enabling-https-on-express-js 
// http://blog.mgechev.com/2014/02/19/create-https-tls-ssl-application-with-express-nodejs/ 
var https = require('https'); 
var fs = require('fs'); 

/** 
* 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); 

/** 
* Get port from environment and store in Express. 
*/ 

var httpsPort = normalizePort(process.env.PORT || '3030'); 
app.set('port', httpsPort); 

/** 
* Create HTTPS server. 
*/ 

// Generate self-signed certificate. 
// $ openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem 
// http://blog.mgechev.com/2014/02/19/create-https-tls-ssl-application-with-express-nodejs/ 
// http://stackoverflow.com/questions/30957793/nodejs-apn-bad-password-read 
// https://startupnextdoor.com/how-to-obtain-and-renew-ssl-certs-with-lets-encrypt-on-node-js/ 
var sslPath = '/etc/letsencrypt/live/example.co.uk/'; 
var options = { 
    key: fs.readFileSync(sslPath + 'privkey.pem'), 
    cert: fs.readFileSync(sslPath + 'fullchain.pem') 
}; 

var httpsServer = https.createServer(options, app); 

/** 
* Listen on provided port, on all network interfaces. 
*/ 

httpsServer.listen(httpsPort); 
httpsServer.on('error', onError); 
httpsServer.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); 
} 

我需要require socket.io嗎？

Answer 1

嘗試添加socket.io模塊到您的文件中使用要求（「socket.io」）

var server = require('http').createServer(); 
var io = require('socket.io')(server); 
io.on('connection', function(client){ 
    client.on('event', function(data){}); 
    client.on('disconnect', function(){}); 
}); 
server.listen(3000);