【node＋小程序＋web端】简单的websocket通讯
websoket是用来做什么的？
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websoket是什么
websocket是一个全新的、独立的协议，基于TCP协议，与HTTP协议兼容却不会融入HTTP协议，仅仅作为HTML5的一部分。
HTTP是个懒惰的协议，server只有收到请求才会做出回应，否则什么事都不干。因此，为了彻底解决这个server主动像client发送数据的问题。W3C在HTML5中提供了一种client与server间进行全双工通讯的网络技术WebSocket。
node模块websocket和socket.io的区别
websocket只是socket.io实现业务封装的一个浏览器方面的backend，类比的话，websocket是tcp，而socket.io是http，后者固然基于前者，但是必须要找socket.io约定的protocol走
用socket.io简单的建立一个服务器
const http = require('http');
const io = require('socket.io');
// 创建http服务
let httpServer = http.createServer();
httpServer.listen(2333,()=>{
console.log('on port 2333')
});
// 创建websocket服务,将socket.io绑定到服务器上
let wsServer = io.listen(httpServer,()=>{
console.log('on port 2333')
});
wsServer.on('connection',function(sock){
sock.on('a',function(num1,num2){
console.log(`接到了浏览器发送的数据:${num1}`)
})
setInterval(function(){
sock.emit('ttt',Math.random())
},500)
})
用websocket搭建服务器
const http = require('http')
const WebSocketServer = require('websocket').server
const httpServer = http.createServer((request, response) => {
console.log('[' + new Date + '] Received request for ' + request.url)
response.writeHead(404)
response.end()
})
const wsServer = new WebSocketServer({
httpServer,
autoAcceptConnections: true
})
wsServer.on('connect', connection => {
connection.on('message', message => {
if (message.type === 'utf8') {
console.log('>> message content from client: ' + message.utf8Data)
connection.sendUTF('[from server] ' + message.utf8Data)
}
}).on('close', (reasonCode, description) => {
console.log('[' + new Date() + '] Peer ' + connection.remoteAddress + ' disconnected.')
})
})
httpServer.listen(8111, () => {
console.log('[' + new Date() + '] Serveris listening on port 8080')
})
在html页面调用websocket
<html>
<body>
<head>
<script src="http://localhost:2333/socket.io/socket.io.js" charset="utf-8"></script>
<script>
let sock = io.connect('ws://localhost:2333')
document.onclick=function(){
sock.emit()
}
sock.on('ttt',function(n){
console.log(`接到了服务器发送的${n}`)
})
</script>
</head>
</body>
</html>
在小程序端调用请求
小程序websocket-api
localsession: function(data){
wx.connectSocket({
url: 'ws://localhost:8999'
})
wx.onSocketOpen(function (res) {
console.log('WebSocket连接已打开！')
setInterval(()=>{
wx.sendSocketMessage({
data: data,
})
},3000)
})
wx.onSocketMessage(function (res) {
console.log(res)
})
wx.onSocketClose(function (res) {
console.log('WebSocket连接已关闭！')
})
},
在vue中运用websocket
1.
vue-websocket
2.
vue-socket.io
3.
let ws = new WebSocket('ws://192.168.1.205:9032/websocket');
ws.onopen = () => {
// Web Socket 已连接上，使用 send() 方法发送数据
//console.log('数据发送中...')
//ws.send('Holle')
//console.log('数据发送完成')
}
ws.onmessage = evt => {
console.log('数据已接收...')
var received_msg = evt.data;
console.log(received_msg);
if("notice" == received_msg)
{
this.initData();
this.play();
}
else{
console.log("不刷新");
}
}
/* ws.onclose = function () {
// 关闭 websocket
console.log('连接已关闭...')
}
// 路由跳转时结束websocket链接
this.$router.afterEach(function () {
ws.close()
})*/