express+socket.io实现一个简易聊天窗
首先是node代码：
const express = require('express')
const bodyParser = require('body-parser')
const app = express()
app.use(bodyParser.urlencoded({ extended: false }))
const server = require('http').createServer(app);
const io = require('socket.io')(server);
// 登陆接口
app.post('/login', (req, res) => {
console.log(req.body)
let { name, password } = req.body
if (name === 'admin') {
if (password === 'admin') {
res.json({ code: 200, msg: '验证通过' })
} else {
res.json({ code: 500, msg: '密码错误' })
}
} else {
res.json({ code: 500, msg: '用户名错误' })
}
})
const lsit = ['仁义道德，也是一种奢侈', '时间不在于你拥有多少，而在于你怎样使用', '放马过来吧！你会死的很光荣的', '念当年有爱的我，可惜啊，你们看不到啦',
'即使一无所有，也要未雨绸缪', '落叶的一生，只是为了归根么', '千军万马一将在，探囊取物有何难', '顺我者昌，逆我者亡，此乃天意', '我可以想去哪就去哪，但是我只想进入你的心里',
'我宁愿犯错误，也不愿什么都不做', '不要测试你的运气，召唤师', '死亡如风，常伴吾身', '我在时光中穿梭，只为找回曾经美好的时光'
]
// websocket
io.on('connection', (socket) => {
// 向客户端发送消息
socket.emit('msg', {
name: '服务端',
content: '你好,欢迎使用Socket.io'
})
// 向所有客户端发送消息
io.emit('broadcast',/* */)
socket.on('msg', (msg) => {
console.log(lsit[Math.floor(Math.random() * lsit.length)])
setTimeout(() => {
socket.emit(msg.type, {
name: '服务端',
content: lsit[Math.floor(Math.random() * lsit.length)]
})
}, 500)
})
});
app.use(express.static(`${__dirname}/static`))
app.get('/', function (req, res) {
res.sendFile(`${__dirname}/index.html`)
})
app.get('*', function (req, res) {
res.send('Hello World')
})
server.listen(3000)
其次是html：
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
<title>聊天室</title>
<!-- Bootstrap -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- HTML5 shim 和 Respond.js 是为了让 IE8 支持 HTML5 元素和媒体查询（media queries）功能 -->
<!-- 警告：通过 file:// 协议（就是直接将 html 页面拖拽到浏览器中）访问页面时 Respond.js 不起作用 -->
<!--[if lt IE 9]>
<script src="https://cdn.jsdelivr.net/npm/html5shiv@3.7.3/dist/html5shiv.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/respond.js@1.4.2/dest/respond.min.js"></script>
<![endif]-->
</head>
<body>
<div class="container">
<h1 style="text-align: center;">express+socket.io聊天室</h1>
<style>
#showLog {
display: block;
}
</style>
<!-- 登陆 -->
<div class="row" id="showLog">
<div class="col-md-12">
<div class="form-group">
<label for="userId">账号</label>
<!-- admin -->
<input type="text" class="form-control" id="userId" value="admin" placeholder="输入账号">
</div>
<div class="form-group">
<label for="password">密码</label>
<!-- admin -->
<input type="password" class="form-control" id="password" value="admin" placeholder="输入密码">
</div>
<button id="login" class="btn btn-success">登陆</button>
</div>
</div>
<style>
#showCon {
display: none;
height: 650px;
background: url('img/backgroundimg.jpg') center no-repeat;
background-size: cover;
border: 2px solid #ccc;
border-radius: 10px;
overflow-y: auto;
}
.alert {
padding: 8px;
}
.left {
text-align: left;
}
.right {
text-align: right;
}
</style>
<!-- 聊天室 -->
<div class="row" id="showCon">
<div class="col-md-12">
<!-- 左侧接收别人消息 -->
<!-- <div class="left">
<p><span class="label label-warning">张三</span></p>
<p><span class="alert alert-warning">hajdhjahdajdhajsdhjahdjadhjadhj</span></p>
</div> -->
<!-- 右侧自己消息 -->
<!-- <div class="right">
<p><span class="label label-success">张三</span></p>
<p><span class="alert alert-success">hajdhjahdajdhajsdhjahdjadhjadhj</span></p>
</div> -->
</div>
</div>
<div style="display: none;" id="hideTxt">
<div class="form-group row">
<label for="cont">输入想要发送的消息</label>
<textarea class="form-control col-md-12" id="cont"
onkeydown="if(event.keyCode==13){event.keyCode=0;event.returnValue=false;}"></textarea>
</div>
<button style="float: right;" class="btn btn-success" onclick="btnSend()">发送</button>
</div>
</div>
<!-- 模态提示框 -->
<div class="modal fade" tabindex="-1" role="dialog" id="myModal">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span
aria-hidden="true">×</span></button>
<h4 class="modal-title">提示</h4>
</div>
<div class="modal-body">
<p id="modal"></p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">关闭</button>
</div>
</div><!-- /.modal-content -->
</div><!-- /.modal-dialog -->
</div><!-- /.modal -->
<!-- jQuery (Bootstrap 的所有 JavaScript 插件都依赖 jQuery，所以必须放在前边) -->
<script src="js/jquery.min.js"></script>
<!-- 加载 Bootstrap 的所有 JavaScript 插件。你也可以根据需要只加载单个插件。 -->
<script src="js/bootstrap.min.js"></script>
<script src="/socket.io/socket.io.js"></script>
<script>
var content = $('#showCon .col-md-12');
var socket = null;
// 登陆
$('#login').click(() => {
var userId = $('#userId').val()
var password = $('#password').val()
if (userId && password) {
$.ajax({
url: 'http://localhost:3000/login',
type: 'post',
data: {
name: userId,
password
},
success(res) {
if (res.code === 200) {
$('#showLog').hide()
$("#showCon,#hideTxt").show()
socket = io('ws://localhost:3000');
socket.on('connect', function () {
console.log('建立连接');
});
socket.on('msg', function (data) {
console.log(data)
content.append(`
<div class="left">
<p><span class="label label-warning">${data.name}</span></p>
<p><span class="alert alert-warning">${data.content}</span></p>
</div>
`)
scro()
});
socket.on('disconnect', function () {
console.log('断开连接');
});
}
}
})
} else {
$('#myModal').modal('show')
$('#modal').text('请输入正确的账号或密码')
}
})
// 发送消息到服务端
// socket.emit('msg', '哈哈哈啊哈')
function btnSend() {
var txt = $('#cont').val()
if (!txt) {
$('#myModal').modal('show')
$('#modal').text('请输入内容')
return;
} else {
socket.emit('msg', {
name: 'admin',
content: txt,
type: 'msg'
})
content.append(`
<div class="right">
<p><span class="label label-success">admin</span></p>
<p><span class="alert alert-success">${txt}</span></p>
</div>`
)
$('#cont').val('')
scro()
}
}
// 滚动条已知在底部
function scro() {
var scr = document.querySelector('#showCon')
scr.scrollTop = scr.scrollHeight;
}
window.onkeydown = (e) => {
var theCode = e || window.event
if (theCode.keyCode === 13) {
btnSend()
}
}
</script>
</body>
</html>
然后有一些npm包，我把package.json里面内容拿过来，方便安装依赖
{
"name": "socketIo",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"bootstrap": "^3.4.1",
"express": "^4.17.1",
"socket.io": "^2.3.0"
}
}
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