http://www.liaoxuefeng.com/wiki/001434446689867b27157e896e74d51a89c25cc8b43bdb3000/0014727922914053479c966220f47da91991fa9c27ac3ea000

package.json

{
    "name": "hello-ws", 
    "version": "1.0.0",
    "description": "Hello WebSocket example",
    "main": "app.js",
    "scripts": {
        "start": "node app.js"
    },
    "keywords": [
        "ws",
        "websocket"
    ],
    "author": "Michael Liao",
    "license": "Apache-2.0",
    "repository": {
        "type": "git",
        "url": "https://github.com/michaelliao/learn-javascript.git"
    },
    "dependencies": {
        "ws": "1.1.1"
    }
}

app.js

const WebSocket = require('ws');

const WebSocketServer = WebSocket.Server;

const wss = new WebSocketServer({
    port: 3000
});

wss.on('connection', function (ws) {
    console.log(`[SERVER] connection()`);
    ws.on('message', function (message) {
        console.log(`[SERVER] Received: ${message}`);
        setTimeout(() => {
            ws.send(`What's your name?`, (err) => {
                if (err) {
                    console.log(`[SERVER] error: ${err}`);
                }
            });
        }, 1000);
    })
});

console.log('ws server started at port 3000...');

// client test:

let count = 0;

let ws = new WebSocket('ws://localhost:3000/ws/chat');

ws.on('open', function () {
    console.log(`[CLIENT] open()`);
    ws.send('Hello!');
});

ws.on('message', function (message) {
    console.log(`[CLIENT] Received: ${message}`);
    count++;
    if (count > 3) {
        ws.send('Goodbye!');
        ws.close();
    } else {
        setTimeout(() => {
            ws.send(`Hello, I'm Mr No.${count}!`);
        }, 1000);
    }
});

另一种测试方法

打开可以执行JavaScript代码的浏览器Console输入：

// 打开一个WebSocket:
var ws = new WebSocket('ws://localhost:3000/test');
// 响应onmessage事件:
ws.onmessage = function(msg) { console.log(msg); };
// 给服务器发送一个字符串:
ws.send('Hello!');

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