跳至主要内容
版本：4.x

服务器初始化

一旦你安装了 Socket.IO 服务器库，你就可以初始化服务器。完整的选项列表可以在这里找到。

提示

对于 TypeScript 用户，可以为事件提供类型提示。请查看这里.

初始化​

独立​

const { Server } = require("socket.io");

const io = new Server({ /* options */ });

io.on("connection", (socket) => {
  // ...
});

io.listen(3000);

你也可以将端口作为第一个参数传递

const { Server } = require("socket.io");

const io = new Server(3000, { /* options */ });

io.on("connection", (socket) => {
  // ...
});

这会隐式启动一个 Node.js HTTP 服务器，可以通过 io.httpServer 访问。

使用 HTTP 服务器​

const { createServer } = require("http");
const { Server } = require("socket.io");

const httpServer = createServer();
const io = new Server(httpServer, { /* options */ });

io.on("connection", (socket) => {
  // ...
});

httpServer.listen(3000);

使用 HTTPS 服务器​

const { readFileSync } = require("fs");
const { createServer } = require("https");
const { Server } = require("socket.io");

const httpsServer = createServer({
  key: readFileSync("/path/to/my/key.pem"),
  cert: readFileSync("/path/to/my/cert.pem")
});

const io = new Server(httpsServer, { /* options */ });

io.on("connection", (socket) => {
  // ...
});

httpsServer.listen(3000);

另请参阅：Node.js 文档

使用客户端证书身份验证

服务器

import { readFileSync } from "fs";
import { createServer } from "https";
import { Server } from "socket.io";

const httpsServer = createServer({
  key: readFileSync("/path/to/server-key.pem"),
  cert: readFileSync("/path/to/server-cert.pem"),
  requestCert: true,
  ca: [
    readFileSync("/path/to/client-cert.pem")
  ]
});

const io = new Server(httpsServer, { /* options */ });

io.engine.on("connection", (rawSocket) => {
  // if you need the certificate details (it is no longer available once the handshake is completed)
  rawSocket.peerCertificate = rawSocket.request.client.getPeerCertificate();
});

io.on("connection", (socket) => {
  console.log(socket.conn.peerCertificate);
  // ...
});

httpsServer.listen(3000);

客户端

import { readFileSync } from "fs";
import { io } from "socket.io-client";

const socket = io("https://example.com", {
  key: readFileSync("/path/to/client-key.pem"),
  cert: readFileSync("/path/to/client-cert.pem"),
  ca: [
    readFileSync("/path/to/server-cert.pem")
  ]
});

使用 HTTP/2 服务器​

const { readFileSync } = require("fs");
const { createSecureServer } = require("http2");
const { Server } = require("socket.io");

const httpServer = createSecureServer({
  allowHTTP1: true,
  key: readFileSync("/path/to/my/key.pem"),
  cert: readFileSync("/path/to/my/cert.pem")
});

const io = new Server(httpServer, { /* options */ });

io.on("connection", (socket) => {
  // ...
});

httpServer.listen(3000);

另请参阅：Node.js 文档

使用 Express​

const express = require("express");
const { createServer } = require("http");
const { Server } = require("socket.io");

const app = express();
const httpServer = createServer(app);
const io = new Server(httpServer, { /* options */ });

io.on("connection", (socket) => {
  // ...
});

httpServer.listen(3000);
注意

在这里使用 app.listen(3000) 将不起作用，因为它会创建一个新的 HTTP 服务器。

更多信息这里.

使用 Koa​

const Koa = require("koa");
const { createServer } = require("http");
const { Server } = require("socket.io");

const app = new Koa();
const httpServer = createServer(app.callback());
const io = new Server(httpServer, { /* options */ });

io.on("connection", (socket) => {
  // ...
});

httpServer.listen(3000);

更多信息这里.

使用 Nest​

查看文档这里.

注意

NestJS v7 及以下版本依赖于 Socket.IO v2，而 NestJS v8 依赖于 Socket.IO v4。请使用兼容的客户端.

使用 Fastify​

你需要注册fastify-socket.io 插件

const fastify = require("fastify");
const fastifyIO = require("fastify-socket.io");

const server = fastify();
server.register(fastifyIO);

server.get("/", (req, reply) => {
  server.io.emit("hello");
});

server.ready().then(() => {
  // we need to wait for the server to be ready, else `server.io` is undefined
  server.io.on("connection", (socket) => {
    // ...
  });
});

server.listen({ port: 3000 });

使用 µWebSockets.js​

import { App } from "uWebSockets.js";
import { Server } from "socket.io";

const app = App();
const io = new Server();

io.attachApp(app);

io.on("connection", (socket) => {
  // ...
});

app.listen(3000, (token) => {
  if (!token) {
    console.warn("port already in use");
  }
});

参考：https://github.com/uNetworking/uWebSockets.js

选项​

完整的可用选项列表可以在这里找到。