Question

我没有在我的节点应用中连接Socket IO，我认为它与我的EJS配置以及我如何呈现index.ejs和layout.ejs文件有关：

当我连接到Socket IO时，我想控制用户已连接的日志：

io.sockets.on('connection', (socket) => {
  console.log('user is connected')

  socket.on('send-message', (data) => {
    io.sockets.emit('new-message', data)
  })

以下是我在localhost:3000处理后端的方法，这是我的代码：

app.get('/', (req, res) => {
  res.render('index')
})

但是当我转到localhost:3000时，它无法控制用户已连接到Socket IO

我也尝试了这个：

app.get('/', (req, res) => {
  res.sendFile('index.ejs', {root:__dirname})
})

以及

app.get('/', (req, res) => {
  res.sendFile(process.env.PWD+'/client/views/index.ejs')
})

但我仍然没有连接。

任何想法我需要做什么？

更多代码：

服务器/ app.js

const
    express = require('express'),
    app = express(),
    server = require('http').createServer(app),
    io = require('socket.io').listen(server),
    ejs = require('ejs'),
    ejsLayouts = require('express-ejs-layouts'),
    mongoose = require('mongoose'),
    ...
    ...

// environment port
const
    port = process.env.PORT || 3000,
    mongoConnectionString = process.env.MONGODB_URL || 'mongodb://localhost/context-app'

    mongoose.connect(mongoConnectionString, (err) => {
      console.log(err || "Connected to MongoDB (context-app)")
    })

// ejs configuration
app.set('view engine', 'ejs')
app.set('views', process.env.PWD+'/client/views');
app.use(ejsLayouts)

app.get('/', (req, res) => {
  res.render('index')
})

io.sockets.on('connection', (socket) => {
  console.log('user is connected');

  socket.on('send-message', (data) => {
    io.sockets.emit('new-message', data)
  })
})

server.listen(port, (err) => {
  console.log(err || 'listening on my very special port ' + port)
})

客户端/视图/ layout.ejs

<!-- /views/layout.ejs -->
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>React Intro</title>
  <!-- Latest compiled and minified CSS -->
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
  <script>...</script>
  <script>...</script>
  <script>
    var socket = io();
  </script>
</head>
<body>
  <% include partials/nav %>
    <div class="container">
        <%- body %>
    </div>
</body>
</html>

客户端/视图/ index.ejs

<div id="main"></div>

<script type="text/babel" src="../app.js"></script>

编辑：解决方案

问题出在客户端：我只是忘了加载Socket IO脚本：<script src="/socket.io/socket.io.js" charset="utf-8"></script>

Answer 1

确保您在客户端加载socket.io脚本：

<script src="/socket.io/socket.io.js" charset="utf-8"></script>

无法使用Node，Express和EJS连接到Socket IO

1 个答案: