项目目录：
image.png
借鉴自：https://www.w3cschool.cn/socket/socket-ulbj2eii.html
html:
<!doctype html>
<html>
<head>
<title>Socket.IO chat</title>
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font: 13px Helvetica, Arial; }
div { background: #000; padding: 3px; position: fixed; bottom: 0; width: 100%; }
div input { border: 0; padding: 10px; width: 90%; margin-right: .5%; }
div 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>
<script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
</head>
<body>
<ul id="messages"></ul>
<div>
<input id="m" autocomplete="off" value="" /><button onclick="messages()">发送</button>
</div>
</body>
<!-- <script src="/socket.io/socket.io.js"></script> -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.3/socket.io.js"></script>
<script>
var socket = io("192.168.10.57:5000");
var name = prompt("用户名字：");
var sendBtn = document.getElementById("m");
document.title = name;
function messages(){
var msg = "加入群聊的用户：" + sendBtn.value;
socket.emit('chatMessage', msg);
sendBtn.value = '';
return false;
}
socket.on('chatMessage', function(msg){
addUseInfo(msg);
});
//展示后台的信息到客户端
function addUseInfo(msg){
var parentElement = document.getElementById('messages');
var liElement = document.createElement("li");
liElement.innerHTML = msg;
parentElement.appendChild(liElement);
}
</script>
</html>
js:
var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);
app.get('/', function(req, res){
res.sendFile(__dirname + '/myindex.html');
});
io.on('connection',function(socket){
console.log('用户连接上了')
socket.on('chatMessage',function(msg){
console.log('mess' + msg);
io.emit('chatMessage',msg);
console.log('fasong')
});
})
http.listen(5000,function(){
console.log("链接上了服务器5000")
})
