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node.js 用socket实现聊天的示例代码

2020-11-27 来源:意榕旅游网

本文介绍了node.js 用socket实现聊天的示例代码,分享给大家,也给自己留个笔记,具体如下:

服务器搭建

app.js

const http = require("http");
const express = require("./express");

//创建一个服务
const server = http.createServer(express);

//监听服务端口
server.listen(8001,()=>{
 console.log("服务端已经启动,请访问 http://localhost:8001");
}); 

express.js

const url=require("url");
const fs=require("fs");

function express(req,res){
 var urlObj=url.parse(req.url);
 //console.log(urlObj);

 var filePath="./www"+urlObj.pathname;
 var content="not found";
 if(fs.existsSync(filePath)){
 content=fs.readFileSync(filePath);
 }
 
 res.end(content.toString());
}


module.exports=express; 

index.html

<!DOCTYPE html>
<html lang="en">
 <head>
 <meta charset="utf-8"/>
 <title>Socket.IO chat</title>
 <style>
 * { margin: 0; padding: 0; box-sizing: border-box; }
 body { font: 13px Helvetica, Arial; }
 form { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; }
 form input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }
 form button { width: 9%; background: rgb(130, 224, 255); border: none; padding: 10px; }
 #messages { list-style-type: none; margin: 0; padding: 0; }
 #messages li { padding: 5px 10px; }
 #messages li:nth-child(odd) { background: #eee; }
 </style>
 </head>
 <body>
 <ul id="messages"></ul>
 <form action="">
 <input id="m" autocomplete="off" /><button>Send</button>
 </form>

 <script src="js/lib/jquery-1.11.1.js"></script>
 <script src="js/lib/socket.io.js"></script> 
 <script src="js/index.js"></script>
 </body>
</html> 

客户端服务搭建与服务端通信

我们要建立服务端socket请求连接

io.on('connection', function(socket){
 console.log('a user connected');

 //断开连接
 socket.on('disconnect', function(){
 console.log('user disconnected');
 });
}); 

index.js

//客户端建立连接 
var socket = io(); 
客户端向服务端发送请求
index.js

$('form').submit(function(){
 //触发事件
 socket.emit('chat message', $('#m').val());
 $('#m').val('');
 return false;
 }); 

app.js

//接收客户端的信息
socket.on('chat message', function(msg){
 console.log('message: ' + msg);
}); 

将服务端的数据广播到客户端去

socket.on('chat message', function(msg){
 console.log('message: ' + msg);

 socket.broadcast.emit("clientE",msg);
 }); 

客户端接收服务端广播出来的数据

socket.on('clientE', function(msg){
 $('#messages').append($('<li>').text(msg));
}); 
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