本文实例为大家分享了Node.js+express+socket实现在线实时多人聊天室的具体代码，供大家参考，具体内容如下

文件结构如下：

Node.js+express+socket实现在线实时多人聊天室

前端部分：

登录页面Login部分：

login.html

<!DOCTYPE html>  
<html lang="en"> 

<head>  
    <meta charset="UTF-8">  
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">  
    <meta http-equiv="X-UA-Compatible" content="ie=edge">  
    <title>login</title>  
    <link rel="stylesheet" href="https://www.freexyz.cn/dev/css/login.css" >  
</head> 

<body>  
    <div class="login-box flex-box">  
        <!--登录标题栏-->  
        <h2 class="sign-title box-width">LOGIN</h2>  
        <!--头像栏-->  
        <div class="picture-carousel">  
            <div class="arrow left-arrow">  
                <div class="before-arrow"></div>  
            </div>  
            <img class="p1 img-setting" src="https://www.freexyz.cn/dev/img/1.jpg" alt="1.jpg">  
            <img class="p2 img-setting" src="https://www.freexyz.cn/dev/img/2.jpg" alt="2.jpg">  
            <img class="p3 img-setting" src="https://www.freexyz.cn/dev/img/3.jpg" alt="3.jpg">  
            <img class="p2 img-setting" src="https://www.freexyz.cn/dev/img/4.jpg" alt="4.jpg">  
            <img class="p1 img-setting" src="https://www.freexyz.cn/dev/img/5.jpg" alt="5.jpg">  
            <div class="arrow right-arrow">  
                <div class="after-arrow"></div>  
            </div>  
        </div>  
        <!--用户名栏-->  
        <div class="name-box box-width">  
            <input type="text" class="user-name box-width" placeholder="Please Type Your Name">  
        </div>  
        <!--确认栏-->  
        <div class="button-box box-width">  
            <input type="button" class="login-button box-width" value="Login The Chatroom">  
        </div>  
        <!--错误信息栏-->  
        <div class="error-box box-width">  
            <span class="error-message">Welcome to chatroom!</span>  
        </div>  
    </div>  
</body>  
<script src="https://www.freexyz.cn/dev/js/login.js"></script> 

</html>

login.css

* {  
    padding: 0;  
    margin: 0;  
    font-family: "Microsoft Yahei";  
} 

html,  
body {  
    width: 100%;  
    height: 100%;  
    font-family: "Microsoft Yahei";  
    display: flex;  
    justify-content: center;  
    align-items: center;  
} 

body {  
    background: linear-gradient(-135deg, #51D15B, #42A855);  
    background: -moz-linear-gradient(-135deg, #51D15B, #42A855);  
    background: -webkit-linear-gradient(-135deg, #51D15B, #42A855);  
    background: -o-linear-gradient(-135deg, #51D15B, #42A855);  
} 

.flex-box {  
    display: flex;  
    justify-content: center;  
    align-items: center;  
} 

.box-width {  
    width: 80%;  
} 


/*最外层*/ 

.login-box {  
    width: 20%;  
    min-width: 304px;  
    max-width: 404px;  
    height: 50%;  
    min-height: 368px;  
    max-height: 468px;  
    flex-direction: column;  
    box-shadow: 1px 1px 15px #7B8C99;  
    background: #fff;  
} 


/*LOGIN标题*/ 

.sign-title {  
    color: #42A855;  
    border: 2px solid #42A855;  
    border-top: transparent;  
    border-left: transparent;  
    border-right: transparent;  
} 


/*图片切换*/ 

.picture-carousel {  
    position: relative;  
    display: flex;  
    margin: 10%;  
} 


/*图片切换箭头*/ 

.arrow {  
    z-index: 3;  
    position: absolute;  
    font-size: 60px;  
    height: 100%;  
    width: 30%;  
    display: flex;  
    justify-content: center;  
    align-items: center;  
    color: #ffffff;  
} 

.arrow:hover {  
    cursor: pointer;  
} 

.left-arrow {  
    left: 0;  
} 

.before-arrow {  
    width: 0px;  
    height: 0px;  
    border-width: 30px;  
    border-style: solid;  
    border-color: transparent #51D15B transparent transparent;  
} 

.right-arrow {  
    right: 0;  
} 

.after-arrow{  
     width: 0px;  
    height: 0px;  
    border-width: 30px;  
    border-style: solid;  
    border-color: transparent  transparent transparent #51D15B;   
} 

.picture-carousel img {  
    width: 80px;  
    height: 80px;  
    transition: all 0.2s linear;  
    -moz-transition: all 0.2s ease-out;  
    -webkit-transition: all 0.2s ease-out;  
    -o-transition: all 0.2s ease-out;  
} 

.img-setting {  
    margin: 0px -15px;  
} 

.p1 {  
    transform: scale(0.6);  
    z-index: 1;  
} 

.p1:hover {  
    transform: scale(0.8);  
} 

.p2 {  
    transform: scale(0.8);  
    z-index: 2;  
} 

.p2:hover {  
    transform: scale(1);  
} 

.p3 {  
    transform: scale(1);  
    z-index: 3;  
} 

.p3:hover {  
    transform: scale(1.2);  
} 


/*用户名*/ 

.name-box {  
    display: flex;  
    justify-content: center;  
    border: 1px solid #51D15B;  
} 

.name-box .user-name {  
    width: 100%;  
    text-align: center;  
    padding: 10px;  
    outline-color: #42A855;  
    border: none;  
    font-size: 16px;  
} 

/* 登录按钮 */
.button-box{
    display: flex;
    justify-content: center;
    margin: 10px 0 20px;
}

.button-box .login-button{
    width: 100%;
    padding: 10px 20px;
    outline:none;
    border: none;
    background: #42A855;
    color: white;
    font-size: 16px;
}

/* 错误信息 */
.error-box{
    color: #42A855;
    border: 2px solid #42A855;
    border-top: transparent;
    border-left: transparent;
    border-right: transparent;
}

.error-box span{
    visibility: hidden;
    color: #d43f3a;
    font-size: 14px;
}

login.js

// 用于存储图片顺序
var imgArray = ['1','2','3','4','5'];

// 获取箭头
var leftArrow = document.getElementsByClassName('left-arrow')[0];
var rightArrow = document.getElementsByClassName('right-arrow')[0];

// 获取用户名
var userName = document.getElementsByClassName('user-name')[0];

// 获取登录按钮
var loginButton = document.getElementsByClassName('login-button')[0];

// 获取错误信息栏
var errorMessage = document.getElementsByClassName('error-message')[0];

// 添加左箭头监听事件
leftArrow.addEventListener('click',function(){
    imgArray.unshift(imgArray[imgArray.length - 1]);     //  向数组的开头添加一个元素    //  
    imgArray.pop();    //  删除并返回数组的最后一个元素
    carouselImg();       //  切换图片
});

// 添加右箭头监听事件
rightArrow.addEventListener('click',function(){
    imgArray.push(imgArray[0]);     //  把第一个元素放在最后
    imgArray.shift();           //  删除并返回数组的第一个元素
    carouselImg();           //  切换图片
});

// 切换图片
function carouselImg(){
    for(var count = 0;count < imgArray.length;count++){
        document.getElementsByTagName('img')[count].src = 'https://www.freexyz.cn/dev/img/' + imgArray[count] + '.jpg';
        document.getElementsByTagName('img')[count].alt=imgArray[count] + '.jpg';
    }
}

// 添加登录按钮监听事件
loginButton.addEventListener('click',function(){
    if(userName.value === ''){
        errorMessage.innerHTML = 'Please Type You Name';
        errorMessage.style.visibility = 'visible';
    }else if(userName.value.length > 8){
        errorMessage.innerHTML = 'Your Name Cannot Over 8 Words';
        errorMessage.style.visibility = 'visible';
    }else{
        window.location.href=encodeURI('index.html?selectpicture=' + document.getElementsByClassName('p3')[0].alt + 
                                    '&username=' + userName.value);
    }
});

// Enter按键绑定登录事件  
document.onkeydown = function (event) {  
    var e = event || window.event;  
    if(e && e.keyCode === 13){
        loginButton.click();
    }
};

index.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>chat-room</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://www.freexyz.cn/dev/css/index.css" />
</head>
<body>
    <div class="chat-box">
        <!-- 聊天框头部 -->
        <div class="chat-header">
            <div class="button-box">
                <input type="button" class="log-out" value="LOGOUT" />
            </div>
        </div>
        <!-- 聊天框主体 -->
        <div class="chat-body">
            <!-- 聊天框左侧 -->
            <div class="chat-body-left">
                <!-- 聊天框左侧聊天内容 -->
                <div class="chat-content"></div>
                <!-- 聊天框左侧聊天输入框 -->
                <div class="chat-edit">
                    <input type="text" class="edit-box" placeholder="Please Type You Message" maxlength="15"/>
                    <input type="button" class="edit-button" value="SEND" />
                </div>
            </div>
            <!-- 聊天框右侧 -->
            <div class="chat-body-right">
                <!-- 聊天框右侧统计人数 -->
                <div class="online-count">Online:0</div>
                <!-- 聊天框右侧用户名 -->
                <div class="user-name">user-name</div>
                <!-- 聊天框右侧头像 -->
                <img class="user-img"  />
            </div>
        </div>
    </div>
</body>
</html>

<script src="https://www.freexyz.cn/dev/js/socket.io.js"></script>
<script src="https://www.freexyz.cn/dev/js/index.js"></script>

index.css

*{
    margin: 0;
    padding: 0;
    font-family: "Microsoft Yahei"
}
html,body{
    width: 100%;
    height: 100%;
}

/* 背景色 */
body{
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(-135deg,#51D15B,#42A855);
    background: -moz-linear-gradient(-135deg,#51D15B,#42A855);
    background: -webkit-linear-gradient(-135deg,#51D15B,#42A855);
    background: -o-linear-gradient(-135deg,#51D15B,#42A855);
}

/* 最外层 */
.chat-box{
    width: 50%;
    max-width: 720px;
    min-width: 400px;
    height: 80%;
    min-height: 530px;
    max-height: 530px;
    display: flex;
    flex-direction: column;
    background: #fff;
    box-shadow: 1px 1px 15px #333;
}

/* 头部 */
.chat-header{
    margin: 5px;
    box-shadow: 1px 1px 15px #7B8C99;
}

.button-box{
    display: flex;
    justify-content: flex-end;
}

.log-out{
    height: 100%;
    font-size: 14px;
    font-weight: bold;
    padding: 5px 15px;
    color: #79C2EA;
    background: #fff;
    outline: none;
    border: none;
    border-radius: 15px;
    cursor: pointer;
}

/* 主体 */
.chat-body{
    height: 90%;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    align-items: center;
    margin: 5px;
    padding: 5px;
}

/* 主体左侧 */
.chat-body-left{
    height: 100%;
    width: 70%;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    margin: 5px;
}

/* 左侧内容 */
.chat-content{
    box-shadow: 1px 1px 15px #7B8C99;
    height: 100%;
    margin-bottom: 5px;
    overflow: scroll;
}

/*聊天气泡*/ 

.my-message-box {  
    display: flex;  
    justify-content: flex-end;  
    align-content: center;  
    margin: 5px;  
} 

.other-message-box {  
    display: flex;  
    justify-content: flex-start;  
    align-content: center;  
    margin: 5px;  
} 

.message-content {  
    display: flex;  
    justify-content: center;
    align-content: center;
    background-color: #51D15B;  
    padding:5px 10px;
    border-radius: 15px;  
    color: #fff;  
} 

.other-message-content{
    display: flex;
    justify-content: center;
    align-content: center;
    background-color: #79C2EA;
    padding: 5px 10px;
    border-radius: 15px;
    color: #fff;
}

.message-content span{
    padding:20px 0px;
}

.user-chat-img {  
    width: 50px;  
    height: 50px;  
} 

.other-message-content span{
    padding: 20px 0px;
}

.message-arrow{
    width: 0;
    height: 0;
    border-width:8px;
    border-style: solid;
    border-color: transparent transparent transparent #51D15B;
    align-self: center;
}

.other-message-arrow{
    width: 0;
    height: 0;
    border-width: 8px;
    border-style: solid;
    border-color: transparent #79C2EA transparent transparent;
    align-self: center;
}

.user-information{
    display: flex;
    flex-direction: column;
    align-content: flex-end;
}
.other-user-information{
    display: flex;
    flex-direction: column;
    align-content: flex-end;
}

.user-chat-name{
    color: #333;
    font-size: 16px;
    text-align: center;
}

/* 聊天输入框 */
.chat-edit{
    margin-top: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 1px 1px 15px #7B8C99;
    overflow: hidden;
}

/* 聊天输入框输入区域 */
.edit-box{
    width: 80%;
    height: 100%;
    margin: 5px;
    border: none;
    outline: none;
}

/* 聊天输入框按钮 */
.edit-button{
    height: 100%;
    padding: 5px 15px;
    background: #fff;
    color: #79C2EA;
    outline: none;
    border: none;
    border-radius: 15px;
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
}

/* 主体右侧 */
.chat-body-right{
    height: 100%;
    width: 30%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: 5px;
    box-shadow: 1px 1px 15px #7B8C99;
}

.user-name{
    margin: 15px;
    font-size: 18px;
    font-weight: bold;
    color: #79C2EA;
}

.user-img{
    width: 100px;
    height: 100px;
    margin: 5px;
}

.online-count{
    font-size: 18px;
    font-weight: bold;
    color: #79C2EA;
}

/* 兼容小屏幕 */
@media screen and (max-width:420px){
    .chat-box{
        width: 50%;
        max-width: 720px;
        min-width: 300px;
        height: 80%;
        min-height: 530px;
        max-height: 530px;
    }
    .chat-body-left{
        height: 100%;
        width: 100%;
        display: flex;
        flex-direction: column;
        justify-content: space-around;
        margin: 5px;
    }
    .chat-body-right{
        display: none;
    }
}

index.js

// 获取url里面的内容
var url = decodeURI(location.href).split('?')[1].split('&'); //..数组第一个元素为图片路径，第二个元素为用户名

console.log(url);

// 获取聊天内容框
var chatContent = document.getElementsByClassName('chat-content')[0];

// 获取聊天输入框
var editBox =  document.getElementsByClassName('edit-box')[0];

// 获取聊天输入框发送按钮
var editButton = document.getElementsByClassName('edit-button')[0];

// 获取用户名栏
var userName = document.getElementsByClassName('user-name')[0];

// 获取在线人数栏
var onlineCount = document.getElementsByClassName('online-count')[0];

// 登录页面的名称放在右侧
userName.innerHTML = url[1].split('=')[1];
var userImg = document.getElementsByClassName('user-img')[0];

// 把登录页面的头像放在右侧
userImg.src = `./img/${url[0].split('=')[1]}`;
var logOut = document.getElementsByClassName('log-out')[0];

// 发送按钮绑定点击事件
editButton.addEventListener('click',sendMessage);

// 登出按钮绑定点击事件
logOut.addEventListener('click',closePage);

// 绑定Enter键和发送事件
document.onkeydown = function(event){
    var e = event || window.event;
    if(e && e.keyCode === 13){
        if(editBox.value !== ''){
            editButton.click();
        }
    }
};

// 关闭页面
function closePage(){
    var userAgent = navigator.userAgent;
    console.log(`userAgent=${userAgent}`);

    if(userAgent.indexOf('Firefox') != -1 || userAgent.indexOf("Chrome") != -1){  //..如果是火狐或者谷歌
        window.location.href = "about:blank";
    }else{
        window.opener = null;
        window.open("","_self");
        window.close();
    }
}

// socket部分
var socket = io();

// 当接收到消息并且不是本机时生成聊天气泡
socket.on('message',function(information){
    console.log('收到消息',information);
    if(information.name !== userName.textContent){  //  不是本机时
        createOtherMessage(information);   //  生成聊天气泡
    }
});

// 当接收到有人连接进来
socket.on('connected',function(onlinecount){
    console.log(`有人登录，在线人数为：${onlinecount}`);
    onlineCount.innerHTML = 'Online:' + onlinecount;
});

// 当接收到有人断开后
socket.on('disconnected',function(onlinecount){
    console.log(`有人断开啦：当前人数为：${onlinecount}`);
    onlineCount.innerHTML = 'Online:' +onlinecount;
});

// 发送本机的消息
function sendMessage(){
    if(editBox.value != ''){     //..如果发送内容不为空
        var myInformation = {
            name :userName.textContent,
            chatContent : editBox.value,
            img : userImg.src
        };
        socket.emit('message',myInformation);
        createMyMessage();    //  创建本机聊天气泡
        editBox.value = '';   //..清空文本框
    }
}

// 生成本机的聊天气泡
function createMyMessage(){
    var myMessageBox = document.createElement('div');
    myMessageBox.className = 'my-message-box';

    var messageContent = document.createElement('div');
    messageContent.className = 'message-content';
    var text = document.createElement('span');
    text.innerHTML = editBox.value;
    messageContent.appendChild(text);
    myMessageBox.appendChild(messageContent);

    var arrow = document.createElement('div');
    arrow.className = 'message-arrow';
    myMessageBox.appendChild(arrow);

    var userInformation = document.createElement('div');
    userInformation.className = 'user-information';
    var userChatImg = document.createElement('img');
    userChatImg.className = 'user-chat-img';
    userChatImg.src = userImg.src;
    var userChatName = document.createElement('div');
    userChatName.className = 'user-chat-name';
    userChatName.innerHTML= userName.textContent;
    userInformation.appendChild(userChatImg);
    userInformation.appendChild(userChatName);
    myMessageBox.appendChild(userInformation);

    chatContent.appendChild(myMessageBox);

    chatContent.scrollTop = chatContent.scrollHeight;  //  滚动到最新聊天内容
}

// 生成其他用户的聊天气泡  
function createOtherMessage(information) {  
    var otherMessageBox = document.createElement('div');  
    otherMessageBox.className = 'other-message-box'; 

    var otherUserInformation = document.createElement('div');  
    otherUserInformation.className = 'other-user-information';  
    var userChatImg = document.createElement('img');  
    userChatImg.className = 'user-chat-img';  
    userChatImg.src = information.img;  
    var userChatName = document.createElement('span');  
    userChatName.className = 'user-chat-name';  
    userChatName.innerHTML = information.name;  
    otherUserInformation.appendChild(userChatImg);  
    otherUserInformation.appendChild(userChatName);  
    otherMessageBox.appendChild(otherUserInformation); 

    var otherMessageArrow = document.createElement('div');  
    otherMessageArrow.className = 'other-message-arrow';  
    otherMessageBox.appendChild(otherMessageArrow); 

    var otherMessageContent = document.createElement('div');  
    otherMessageContent.className = 'other-message-content';  
    var text = document.createElement('span');  
    text.innerHTML = information.chatContent;  
    otherMessageContent.appendChild(text);  
    otherMessageBox.appendChild(otherMessageContent); 

    chatContent.appendChild(otherMessageBox); 

    chatContent.scrollTop = chatContent.scrollHeight;  
}

server.js

// 引入必须模棱
var express = require('express');
var app = express();
var http = require('http').Server(app);
var io = require('socket.io')(http);
var path = require('path');

// 在线人数统计
var onlineCount = 0;
app.use(express.static(__dirname));

// 路径映射
app.get('/login.html',function(request,response){
    response.sendFile('login.html');
});

// 当有用户连接进来时
io.on('connection',function(socket){
    console.log('a user connected');

    // 发送给客户端在线人数
    io.emit('connected',++onlineCount);

    // 当有用户断开
    socket.on('disconnect',function(){

            console.log('user disconnected');

            // 发送给客户端人数
            io.emit('disconnected',--onlineCount);
            console.log(onlineCount);
    });

    // 收到了客户端发来的消息
    socket.on('message',function(message){
        // 给客户端发送消息
        console.log('服务器收到的消息为：',message);
        io.emit('message',message);
    });
});

var server = http.listen(4000,function(){
    console.log('Server is running');
});

最后

终端输入

node server.js

浏览器地址栏输入

http://localhost:4000/login.html

Node.js+express+socket实现在线实时多人聊天室

Node.js+express+socket实现在线实时多人聊天室

Node.js+express+socket实现在线实时多人聊天室

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

声明：本站所有文章，如无特殊说明或标注，均为本站原创发布。任何个人或组织，在未征得本站同意时，禁止复制、盗用、采集、发布本站内容到任何网站、书籍等各类媒体平台。如若本站内容侵犯了原著者的合法权益，可联系我们进行处理。