Node.js '；共享'；NodeJS模块之间的对象

我是NodeJS开发的新手，正在使用socket.io库进行一些测试。基本上，我想做的是在客户端（Angular 6 web app）和服务器之间建立socket.io连接，并在新用户连接时广播消息

现在，代码非常简单，这就是我所拥有的：

app.js

var express = require('express');
var http = require('http');
var socketIO = require('socket.io');

// Routes
var twitterRoutes = require('./routes/user');

var app = express();

var server = http.Server(app);

var io = socketIO(server);  // <== THIS OBJECT IS WHAT I WANT TO USE FROM THE ROUTES

[ ... ]

io.on('connect', (socket) => {
    console.log('New user connected');

    socket.on('disconnect', (reason) => {
        console.log('User disconnected:', reason);
    });

    socket.on('error', (err) => {
        console.log('Error in connection: ', err);
    });
});

var express = require('express');

var config = require('../config/config');

var router = express.Router();

router.post('/login', (req, res, next) => {

    // DO ROUTE LOGIC

    // I WANT TO BROADCAST THE NEW LOGGED USER USING io.broadcast.emit, BUT DON'T KNOW HOW
    // <=====
});

var io = socketIO(server);

global.ioObj = io;

router.post('/login', (req, res, next) => {

  // DO ROUTE LOGIC

  if (global.ioObj) {
    global.ioObj.sockets.clients().emit('new-message', { type: 'message', text: 'New user has logged in' });
  }

});

---

我怎么做呢？提前感谢，

不确定这是否是最好的方式，但您可以使用中间件在请求处理程序之间共享内容

// define and use a middleware
app.use(function shareIO(req, res, next) {
  req.io = io;
  next();
})

然后您可以在请求处理程序中使用

req.io

router.post('/login', (req, res, next) => {

    // DO ROUTE LOGIC

    req.io.emit('event')
});

---

您可以通过在函数中注入IO变量来做您想做的事情

    // app.js
    var app = express();
    var server = http.Server(app);
    var io = socketIO(server);
    server.use(require('./router')(io))
    ...

    // router.js
    module.exports = function makeRouter(io) {
      var router = express.Router();
      router.post('/login', (req, res, next) => {
        // do something with io

      }
      return router
    }

---

我不知道这是否是最佳实践，但我已将

io

对象指定给

global

对象的一个属性，我可以从应用程序的任何地方访问它。这就是我所做的：

app.js

var express = require('express');
var http = require('http');
var socketIO = require('socket.io');

// Routes
var twitterRoutes = require('./routes/user');

var app = express();

var server = http.Server(app);

var io = socketIO(server);  // <== THIS OBJECT IS WHAT I WANT TO USE FROM THE ROUTES

[ ... ]

io.on('connect', (socket) => {
    console.log('New user connected');

    socket.on('disconnect', (reason) => {
        console.log('User disconnected:', reason);
    });

    socket.on('error', (err) => {
        console.log('Error in connection: ', err);
    });
});

var express = require('express');

var config = require('../config/config');

var router = express.Router();

router.post('/login', (req, res, next) => {

    // DO ROUTE LOGIC

    // I WANT TO BROADCAST THE NEW LOGGED USER USING io.broadcast.emit, BUT DON'T KNOW HOW
    // <=====
});

var io = socketIO(server);

global.ioObj = io;

router.post('/login', (req, res, next) => {

  // DO ROUTE LOGIC

  if (global.ioObj) {
    global.ioObj.sockets.clients().emit('new-message', { type: 'message', text: 'New user has logged in' });
  }

});

路由/user.js

var express = require('express');
var http = require('http');
var socketIO = require('socket.io');

// Routes
var twitterRoutes = require('./routes/user');

var app = express();

var server = http.Server(app);

var io = socketIO(server);  // <== THIS OBJECT IS WHAT I WANT TO USE FROM THE ROUTES

[ ... ]

io.on('connect', (socket) => {
    console.log('New user connected');

    socket.on('disconnect', (reason) => {
        console.log('User disconnected:', reason);
    });

    socket.on('error', (err) => {
        console.log('Error in connection: ', err);
    });
});

var express = require('express');

var config = require('../config/config');

var router = express.Router();

router.post('/login', (req, res, next) => {

    // DO ROUTE LOGIC

    // I WANT TO BROADCAST THE NEW LOGGED USER USING io.broadcast.emit, BUT DON'T KNOW HOW
    // <=====
});

var io = socketIO(server);

global.ioObj = io;

router.post('/login', (req, res, next) => {

  // DO ROUTE LOGIC

  if (global.ioObj) {
    global.ioObj.sockets.clients().emit('new-message', { type: 'message', text: 'New user has logged in' });
  }

});