【node+小程序+web端】簡單的websocket通訊
websoket是用來做什么的?
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websoket是什么
websocket是一個全新的、獨立的協議,基於TCP協議,與HTTP協議兼容卻不會融入HTTP協議,僅僅作為HTML5的一部分。
HTTP是個懶惰的協議,server只有收到請求才會做出回應,否則什么事都不干。因此,為了徹底解決這個server主動像client發送數據的問題。W3C在HTML5中提供了一種client與server間進行全雙工通訊的網絡技術WebSocket。
node模塊websocket和socket.io的區別
websocket只是socket.io實現業務封裝的一個瀏覽器方面的backend,類比的話,websocket是tcp,而socket.io是http,后者固然基於前者,但是必須要找socket.io約定的protocol走
用socket.io簡單的建立一個服務器
const http = require('http');
const io = require('socket.io');
// 創建http服務
let httpServer = http.createServer();
httpServer.listen(2333,()=>{
console.log('on port 2333')
});
// 創建websocket服務,將socket.io綁定到服務器上
let wsServer = io.listen(httpServer,()=>{
console.log('on port 2333')
});
wsServer.on('connection',function(sock){
sock.on('a',function(num1,num2){
console.log(`接到了瀏覽器發送的數據:${num1}`)
})
setInterval(function(){
sock.emit('ttt',Math.random())
},500)
})
用websocket搭建服務器
const http = require('http')
const WebSocketServer = require('websocket').server
const httpServer = http.createServer((request, response) => {
console.log('[' + new Date + '] Received request for ' + request.url)
response.writeHead(404)
response.end()
})
const wsServer = new WebSocketServer({
httpServer,
autoAcceptConnections: true
})
wsServer.on('connect', connection => {
connection.on('message', message => {
if (message.type === 'utf8') {
console.log('>> message content from client: ' + message.utf8Data)
connection.sendUTF('[from server] ' + message.utf8Data)
}
}).on('close', (reasonCode, description) => {
console.log('[' + new Date() + '] Peer ' + connection.remoteAddress + ' disconnected.')
})
})
httpServer.listen(8111, () => {
console.log('[' + new Date() + '] Serveris listening on port 8080')
})
在html頁面調用websocket
<html>
<body>
<head>
<script src="http://localhost:2333/socket.io/socket.io.js" charset="utf-8"></script>
<script>
let sock = io.connect('ws://localhost:2333')
document.onclick=function(){
sock.emit()
}
sock.on('ttt',function(n){
console.log(`接到了服務器發送的${n}`)
})
</script>
</head>
</body>
</html>
在小程序端調用請求
小程序websocket-api
localsession: function(data){
wx.connectSocket({
url: 'ws://localhost:8999'
})
wx.onSocketOpen(function (res) {
console.log('WebSocket連接已打開!')
setInterval(()=>{
wx.sendSocketMessage({
data: data,
})
},3000)
})
wx.onSocketMessage(function (res) {
console.log(res)
})
wx.onSocketClose(function (res) {
console.log('WebSocket連接已關閉!')
})
},
在vue中運用websocket
1.
vue-websocket
2.
vue-socket.io
3.
let ws = new WebSocket('ws://192.168.1.205:9032/websocket');
ws.onopen = () => {
// Web Socket 已連接上,使用 send() 方法發送數據
//console.log('數據發送中...')
//ws.send('Holle')
//console.log('數據發送完成')
}
ws.onmessage = evt => {
console.log('數據已接收...')
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 () {
// 關閉 websocket
console.log('連接已關閉...')
}
// 路由跳轉時結束websocket鏈接
this.$router.afterEach(function () {
ws.close()
})*/