Sample code sharing for HTML5+NodeJs to implement WebSocket instant messaging-H5 Tutorial-php.cn

Home

Web Front-end

H5 Tutorial

Sample code sharing for HTML5+NodeJs to implement WebSocket instant messaging

黄舟

Mar 22, 2017 pm 03:23 PM

Statement: This article is an original article. If you need to reprint, please indicate the source WAxes, thank you!

Recently I have been learning HTML5 and making canvas games and the like. I found that in addition to canvas, a powerful tool in HTML5, WebSocket is also very useful. Worth noting. It can be used to make dual-screen interactive games. What is a dual-screen interactive game? It is to control PC web games through mobile devices. In this case, real-time communication will be used, and WebSocket is undoubtedly the most suitable. WebSocket has many advantages over HTTP. The main reason is that WebSocket only establishes a TCP connection and can actively push data to the client. It also has lighter protocol headers to reduce the amount of data transmission. Therefore, WebSocket is the best protocol for real-time communication for the time being.

As for the server language choice, nodeJs, firstly, because I am a front-end person and am familiar with javascript. Compared to other back-end languages, I will naturally prefer nodeJs. Secondly, NodeJs itself The event-driven approach is good at maintaining highly concurrent connections with a large number of clients. So I chose NodeJs.

The implementation of the server is very simple. First install a nodeJs module called nodejs-websocket. Directly type in the nodeJs command line: npm install nodejs-websocket and press Enter to install it. , and then you can start building the server. Because of the nodejs-websocket module, we don’t have to do a lot of work ourselves. We can just call the methods encapsulated by others directly:

　【 Server code], determine which one is game1 and which one is game2 based on the message from the client, and save the connection object.

var ws = require("nodejs-websocket");
console.log("开始建立连接...")var game1 = null,game2 = null , 
game1Ready = false , game2Ready = false;
var server = ws.createServer(function(conn){
    conn.on("text", function (str) {
        console.log("收到的信息为:"+str)        
        if(str==="game1"){
            game1 = conn;
            game1Ready = true;
            conn.sendText("success");
        }        if(str==="game2"){
            game2 = conn;
            game2Ready = true;
        }        if(game1Ready&&game2Ready){
            game2.sendText(str);
        }

        conn.sendText(str)
    })
    conn.on("close", function (code, reason) {
        console.log("关闭连接")
    });
    conn.on("error", function (code, reason) {
        console.log("异常关闭")
    });
}).listen(8001)
console.log("WebSocket建立完毕")

[game1 code]: Get the contents of the three boxes by clicking and transfer them to the server

<!doctype html><html lang="en"><head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        .kuang{text-align: center;margin-top:200px;}
        #mess{text-align: center}
        .value{width: 200px;height:200px;border:1px solid;text-align: center;line-height: 200px;display: inline-block;}
    </style></head><body>
    <p id="mess">正在连接...</p>
    <p class="kuang">
        <p class="value" id="value1">小明小明</p>
        <p class="value" id="value2">大胸大胸</p>
        <p class="value" id="value3">小张小张</p>
    </p>

    <script>
        var mess = document.getElementById("mess");        
        if(window.WebSocket){            
        var ws = new WebSocket(&#39;ws://192.168.17.80:8001&#39;);

            ws.onopen = function(e){
                console.log("连接服务器成功");
                ws.send("game1");
            }
            ws.onclose = function(e){
                console.log("服务器关闭");
            }
            ws.onerror = function(){
                console.log("连接出错");
            }

            ws.onmessage = function(e){
                mess.innerHTML = "连接成功"
                document.querySelector(".kuang").onclick = function(e){                    
                var time = new Date();
                    ws.send(time + "  game1点击了“" + e.target.innerHTML+"”");
                }
            }
        }    </script></body></html>

[game2 code]: Get the service Pushed message and display

nbsp;html>
    <meta>
    <title>Document</title>
    <style>
        .kuang{text-align: center;margin-top:200px;}
        #mess{text-align: center}
    </style>
    <p></p>

    <script>
        var mess = document.getElementById("mess");        
        if(window.WebSocket){            
        var ws = new WebSocket(&#39;ws://192.168.17.80:8001&#39;);

            ws.onopen = function(e){
                console.log("连接服务器成功");
                ws.send("game2");
            }
            ws.onclose = function(e){
                console.log("服务器关闭");
            }
            ws.onerror = function(){
                console.log("连接出错");
            }

            ws.onmessage = function(e){                
            var time = new Date();
                mess.innerHTML+=time+"的消息："+e.data+"<br>"
            }
        }    </script>

Running screenshot：

The above is the detailed content of Sample code sharing for HTML5+NodeJs to implement WebSocket instant messaging. For more information, please follow other related articles on the PHP Chinese website!

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

html5的div一行可以放两个吗Apr 25, 2022 pm 05:32 PM

html5的div元素默认一行不可以放两个。div是一个块级元素，一个元素会独占一行，两个div默认无法在同一行显示；但可以通过给div元素添加“display：inline;”样式，将其转为行内元素，就可以实现多个div在同一行显示了。

html5中列表和表格的区别是什么Apr 28, 2022 pm 01:58 PM

html5中列表和表格的区别：1、表格主要是用于显示数据的，而列表主要是用于给数据进行布局；2、表格是使用table标签配合tr、td、th等标签进行定义的，列表是利用li标签配合ol、ul等标签进行定义的。

html5怎么让头和尾固定不动Apr 25, 2022 pm 02:30 PM

固定方法：1、使用header标签定义文档头部内容，并添加“position:fixed;top:0;”样式让其固定不动；2、使用footer标签定义尾部内容，并添加“position: fixed;bottom: 0;”样式让其固定不动。

HTML5中画布标签是什么May 18, 2022 pm 04:55 PM

HTML5中画布标签是“<canvas>”。canvas标签用于图形的绘制，它只是一个矩形的图形容器，绘制图形必须通过脚本（通常是JavaScript）来完成；开发者可利用多种js方法来在canvas中绘制路径、盒、圆、字符以及添加图像等。

html5中不支持的标签有哪些Mar 17, 2022 pm 05:43 PM

html5中不支持的标签有：1、acronym，用于定义首字母缩写，可用abbr替代；2、basefont，可利用css样式替代；3、applet，可用object替代；4、dir，定义目录列表，可用ul替代；5、big，定义大号文本等等。

html5废弃了哪个列表标签Jun 01, 2022 pm 06:32 PM

html5废弃了dir列表标签。dir标签被用来定义目录列表，一般和li标签配合使用，在dir标签对中通过li标签来设置列表项，语法“<dir><li>列表项值</li>...</dir>”。HTML5已经不支持dir，可使用ul标签取代。

Html5怎么取消td边框May 18, 2022 pm 06:57 PM

3种取消方法：1、给td元素添加“border:none”无边框样式即可，语法“td{border:none}”。2、给td元素添加“border:0”样式，语法“td{border:0;}”，将td边框的宽度设置为0即可。3、给td元素添加“border:transparent”样式，语法“td{border:transparent;}”，将td边框的颜色设置为透明即可。

html5是什么意思Apr 26, 2021 pm 03:02 PM

html5是指超文本标记语言（HTML）的第五次重大修改，即第5代HTML。HTML5是Web中核心语言HTML的规范，用户使用任何手段进行网页浏览时看到的内容原本都是HTML格式的，在浏览器中通过一些技术处理将其转换成为了可识别的信息。HTML5由不同的技术构成，其在互联网中得到了非常广泛的应用，提供更多增强网络应用的标准机。

See all articles