websocket 一种通信协议
ajax/jsonp 单工通信
websocket 全双工通信 性能高 速度快
2种方式：
1、前端的websocket
2、后端的 socket.io
一、后端socket.io
cnpm i socket.io
接收on 发送emit ——可以发送任意类型的数据
后端：
1、创建httpServer
2、创建wsServer var ws = io(httpServer);
3、连接
ws.on(“connect”,function(socket){
//45 发送或者接收
发送 socket.emit(“名称”，数据);
广播 socket.broadcast.emit(“名称”，数据);
接收 socket.on(名称，function(data——数据){
});
});
前端：
1、引入js src=”/socket.io/socket.io.js”
2、连接
var ws = io(“ws://ip:port”);
3、发送接收 on/emit
聊天室：
chat.html
无标题文档
*{padding:0;margin:0;list-style:none;}
#div1{ position:relative;width:500px; height:400px; border:1px solid red;}
#text{ position:absolute;left:0;bottom:0;width:80%; height:100px;}
#btn1{ position:absolute;right:0;bottom:0;width:20%; height:100px;}
#ul1{width:100%; height:300px; background:#ccc; overflow-y:auto;}
#ul1 li{ line-height:30px; border-bottom:1px dashed red;}
//var ws = io(“ws://10.30.155.92:9000”);
//var ws = io(“http://10.30.155.92:9000”);
//var ws = io();
var ws = io.connect(“ws://10.30.155.92:9000”);//标准写法 ws://
window.onload = function(){
var oUl = document.getElementById(“ul1”);
var oText = document.getElementById(“text”);
var oBtn = document.getElementById(“btn1”);
var name = prompt(“请输入你的用户名”)//”张三”;
oBtn.onclick = function(){
//发送数据
var data = {name:name,value:oText.value};
ws.emit(“msg”,data);
createLi(data);
};
//接收数据 1创建dom
ws.on(“msg_all”,function(data){
console.log(data);
createLi(data);
});
function createLi(data){
//创建dom
var oLi = document.createElement(“li”);
oLi.innerHTML = `
${data.name}
${data.value}`;
oUl.appendChild(oLi);
oUl.scrollTop = oUl.scrollHeight;
}
};
chat.js
var http = require(“http”);
var io = require(“socket.io”);
var fs = require(“fs”);
//创建http服务
var httpServer = http.createServer(function(req,res){
var url = req.url;
fs.readFile(“www”+url,function(err,data){
if(err){
res.end(“404”);
} else {
res.end(data);
}
});
});
httpServer.listen(9000);
//创建websockt服务
var ws = io(httpServer);
ws.on(“connection”,function(socket){
console.log(“wsServer”);
//接收数据
socket.on(“msg”,function(data){
console.log(data);
//发送数据广播
socket.broadcast.emit(“msg_all”,data);
});
});
前端H5 WebSocket
ws: http
wss:https
前端配置:
var ws = new WebSocket(“ws://ip:port”);
ws.onopen = function(evt) {
console.log(“Connection open …”);
ws.send(“Hello WebSockets!”);
};
ws.onmessage = function(evt) {
console.log( “Received Message: ” + evt.data);
ws.close();
};
ws.onclose = function(evt) {
console.log(“Connection closed.”);
};
后端：npm i ws
npm i ws
var wss = new WebSocket({server:httpServer});
wss.on(“connection”,function(ws,req){
发送 接收
接收
ws.onmessage(function(ev){
//数据 ev.data
});
发送：
ws.send(数据);
数据 最好只能是字符串！！！
});
exp:
h5.html
无标题文档
var ws = new WebSocket(“ws://localhost:9000”);
//建立连接
ws.onopen = function(ev) {
console.log(“连接成功”);
};
//接收数据
ws.onmessage = function(ev) {
console.log( “接收数据”,ev.data);//server—>client
//发送数据
//ws.send(“client—>server”);
try{
//只处理json
var json = JSON.parse(ev.data);
console.log(json);
if(json.type == “click”){
var oSpan = document.getElementById(“s1”);
oSpan.innerHTML = json.value;
}
}catch(e){
}
};
//连接关闭
ws.onclose = function(evt) {
console.log(“连接关闭”);
};
window.onload = function(){
var oBtn = document.getElementById(“btn1”);
oBtn.onclick = function(){
//发送数据 只能发送字符串
ws.send(JSON.stringify({type:”click”,value:”abc”}));
};
}
h5 WebSocket
1111
h5.js:
var http = require(“http”);
var WebSocket = require(“ws”);
var fs = require(“fs”);
//创建http服务
var httpServer = http.createServer(function(req,res){
var url = req.url;
fs.readFile(“www”+url,function(err,data){
if(err){
res.end(“404”);
} else {
res.end(data);
}
});
});
httpServer.listen(9000);
//创建websockt服务
var wss = new WebSocket.Server({ server:httpServer });
wss.on(‘connection’, function connection(ws) {
console.log(“wsServer”);
//发送 send
ws.send(“server—>client”);
//接收
ws.on(‘message’, function(message) {
console.log(message);
//ws.send(message);
//广播
wss.clients.forEach(function(client) {
if (client.readyState === WebSocket.OPEN) {
client.send(message);
}
});
});
});
爱我所爱无怨无悔