node.js 用socket实现聊天的示例代码

时间:2020-05-16 哈希人气:0

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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