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浪里行舟
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‎websocket/iframe流.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="X-UA-Compatible" content="ie=edge">
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<title>Document</title>
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</head>
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<body>
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<div id="clock"></div>
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<iframe src="/clock" style="display:none"></iframe>
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</body>
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</html>

‎websocket/iframe流.js‎

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//iframe流
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let express = require('express')
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let app = express()
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app.use(express.static(__dirname))
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app.get('/clock', function(req, res) {
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setInterval(function() {
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let date = new Date().toLocaleString()
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res.write(`
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<script type="text/javascript">
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parent.document.getElementById('clock').innerHTML = "${date}";
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</script>
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`)
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}, 1000)
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})
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app.listen(8080)

‎websocket/websocket.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<meta http-equiv="X-UA-Compatible" content="ie=edge" />
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<title>websocket</title>
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</head>
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<body>
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<div id="clock"></div>
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<script>
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let clockDiv = document.getElementById('clock')
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let socket = new WebSocket('ws://localhost:9999')
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//当连接成功之后就会执行回调函数
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socket.onopen = function() {
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console.log('客户端连接成功')
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//再向服务 器发送一个消息
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socket.send('hello') //客户端发的消息内容 为hello
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}
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//绑定事件是用加属性的方式
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socket.onmessage = function(event) {
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clockDiv.innerHTML = event.data
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console.log('收到服务器端的响应', event.data)
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}
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</script>
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</body>
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</html>

‎websocket/websocket.js‎

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let express = require('express')
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let app = express()
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app.use(express.static(__dirname))
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//http服务器
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app.listen(3000)
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let WebSocketServer = require('ws').Server
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//用ws模块启动一个websocket服务器,监听了9999端口
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let wsServer = new WebSocketServer({ port: 9999 })
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//监听客户端的连接请求 当客户端连接服务器的时候，就会触发connection事件
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//socket代表一个客户端,不是所有客户端共享的，而是每个客户端都有一个socket
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wsServer.on('connection', function(socket) {
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//每一个socket都有一个唯一的ID属性
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console.log(socket)
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console.log('客户端连接成功')
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//监听对方发过来的消息
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socket.on('message', function(message) {
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console.log('接收到客户端的消息', message)
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socket.send('服务器回应:' + message)
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})
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})

‎websocket/轮询.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta http-equiv="X-UA-Compatible" content="ie=edge">
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<title>Document</title>
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</head>
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<body>
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<div id="clock"></div>
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<script>
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let clockDiv = document.getElementById('clock');
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setInterval(function(){
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let xhr = new XMLHttpRequest;
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xhr.open('GET','/clock',true);
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xhr.onreadystatechange = function(){
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if(xhr.readyState == 4 && xhr.status == 200){
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console.log(xhr.responseText);
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clockDiv.innerHTML = xhr.responseText;
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}
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}
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xhr.send();
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},1000);
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</script>
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</body>
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</html>

‎websocket/轮询.js‎

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//轮训
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let express = require('express')
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let app = express()
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app.use(express.static(__dirname))
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app.get('/clock', function(req, res) {
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res.end(new Date().toLocaleString())
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})
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app.listen(8080)

‎websocket/长轮询.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<meta http-equiv="X-UA-Compatible" content="ie=edge" />
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<title>Document</title>
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</head>
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<body>
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<div id="clock"></div>
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<script>
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let clockDiv = document.getElementById('clock')
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function send() {
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let xhr = new XMLHttpRequest()
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xhr.open('GET', '/clock', true)
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xhr.timeout = 2000 // 超时时间，单位是毫秒
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xhr.onreadystatechange = function() {
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if (xhr.readyState == 4) {
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if (xhr.status == 200) {
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//如果返回成功了，则显示结果
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clockDiv.innerHTML = xhr.responseText
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}
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//不管成功还是失败都会发下一次请求
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send()
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}
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}
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xhr.ontimeout = function() {
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send()
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}
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xhr.send()
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}
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send()
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</script>
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</body>
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</html>

‎websocket/长轮询.js‎

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//长轮训
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let express = require('express')
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let app = express()
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app.use(express.static(__dirname))
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app.get('/clock', function(req, res) {
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res.end(new Date().toLocaleString())
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})
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app.listen(8080)

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