<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Document</title>

    <style>

        *{

            margin: 0;

            padding: 0;

            list-style: none;

        }

        textarea{

            resize: none;

        }

        .main1{

            float: left;

        }

        #main{

            float: left;

            width: 400px;

            height: 400px;

            overflow-y: auto;

            border: solid 1px blue;

        }

        .dialog{

            width: 300px;

            height: 50px;

            margin: 20px 30px;

        }

        .course-btn {

            width: 150px;

            background-color: #00b33b;

            font: 14px/40px "Helvetica Neue","Hiragino Sans GB","Segoe UI","Microsoft Yahei","微软雅黑",Tahoma,Arial,STHeiti,sans-serif;

            height: 40px;

            padding: 0 12px;

            text-align: center;

            color: #fff;

            cursor: pointer;

            margin-top: 20px;

            border-radius: 2px;

        }

        .textRun{

            display: none;

            margin-left: 30px;

            width: 300px;

        }

    </style>

</head>

<body>

    <div class="main1">

        <div class="dialog">

            <input type="text" id="username" placeholder="请输入用户名">

            <button onclick=dialog()>登录</button>

        </div>

        <div class="textRun">

            <textarea name="" id="tv" cols="30" rows="10"></textarea>

            <div onclick="textrun()" class="course-btn">发表评论</div>

        </div>

    </div>

    <div id="main">

    </div>

    <script src="js/socket.io.slim.js"></script>

    <script>

        var username;

        function dialog () {

            username = document.getElementById('username').value;

            var DA = document.getElementsByClassName('dialog')[0];

            if(username!='') {

                socket.emit('dialog',username)

                DA.style.display = 'none';

                document.getElementsByClassName('textRun')[0].style.display = 'block';

            }

        }

        function textrun () {

            var text = document.getElementById('tv').value;

            socket.emit('text',{name:username,text:text})

            document.getElementById('tv').value = '';

        }

        var socket = io('http://localhost:3001')

        socket.on("text",function(data){

            console.log(data)

            var div = document.createElement('div');

            var t = div.innerHTML = '<p>'+data.name+':'+data.text+'</p>';

            var main = document.getElementById('main');

            main.appendChild(div)

            main.scrollTop = main.scrollHeight;

        })

    </script>

</body>

</html>

var app = require('http').createServer();

var io = require('socket.io')(app);

var count = 0

var mapUsername = [];

function addEventLinsten(socket, event) {

    socket.on(event, function(data){

        for (var i in mapUsername) {

            if(i){

                mapUsername[i].emit(event, data)

            }

        }

    })

}

// 连接

io.on('connection', function(socket){

    count += 1

    socket.num = count;

    mapUsername[count] = socket

    addEventLinsten(socket, 'dialog')

    addEventLinsten(socket, 'text')

    // 断开

    socket.on('disconnect', function(){

        delete(mapUsername[socket.num])

    })

})

app.listen(3001);

console.log('socket 运行成功')