跨浏览器窗口,7种方式

发表于 2021-09-01 | 分类与 web

字数统计: 1.4k 字 | 阅读时间大约 7 分钟

跨浏览器窗口,7种方式

WebSocket

模拟聊天室

服务端代码

const WebSocket = require('ws');

const server = new WebSocket.Server({
port: 8080
});

server.on('open', function open() {
console.log('connected');
});

server.on('close', function close() {
console.log('disconnected');
});

server.on('connection', function connection(ws, req) {
const ip = req.connection.remoteAddress;
const port = req.connection.remotePort;
const clientName = ip + port;

console.log('%s is connected', clientName)

// 发送欢迎信息给客户端
ws.send("Welcome " + clientName);

ws.on('message', function incoming(message) {
    console.log('received: %s from %s', message, clientName);

    // 广播消息给所有客户端
    server.clients.forEach(function each(client) {
    if (client.readyState === WebSocket.OPEN) {
        client.send(clientName + " -> " + message);
    }
    });

});

});

客户端的实现

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>WebSocket Chat</title>
</head>
<body>
    <script type="text/javascript">
        var socket;
        if (!window.WebSocket) {
            window.WebSocket = window.MozWebSocket;
        }
        if (window.WebSocket) {
            socket = new WebSocket("ws://localhost:8080/ws");
            socket.onmessage = function (event) {
                var ta = document.getElementById('responseText');
                ta.value = ta.value + '\n' + event.data
            };
            socket.onopen = function (event) {
                var ta = document.getElementById('responseText');
                ta.value = "连接开启!";
            };
            socket.onclose = function (event) {
                var ta = document.getElementById('responseText');
                ta.value = ta.value + "连接被关闭";
            };
        } else {
            alert("你的浏览器不支持 WebSocket！");
        }

        function send(message) {
            if (!window.WebSocket) {
                return;
            }
            if (socket.readyState == WebSocket.OPEN) {
                socket.send(message);
            } else {
                alert("连接没有开启.");
            }
        }
    </script>
    <form onsubmit="return false;">
        <h3>WebSocket 聊天室：</h3>
        <textarea id="responseText" style="width: 500px; height: 300px;"></textarea>
        <br>
        <input type="text" name="message" style="width: 300px" value="您好">
        <input type="button" value="发送消息" onclick="send(this.form.message.value)">
        <input type="button" onclick="javascript:document.getElementById('responseText').value=''" value="清空聊天记录">
    </form>
</body>
</html>

定时器 + 客户端存储

postMessage

StorageEvent

page1
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localStorage.setItem('message',JSON.stringify({
    message: '消息'，
    from: 'Page 1',
    date: Date.now()
}))


page2
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localStorage.setItem('message',JSON.stringify({
    message: '消息'，
    from: 'Page 1',
    date: Date.now()
}))

BroadcastChannel

page1
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var channel = new BroadcastChannel("channel-BroadcastChannel");
channel.postMessage('Hello, BroadcastChannel!')

page2
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var channel = new BroadcastChannel("channel-BroadcastChannel");
channel.addEventListener("message", function(ev) {
    console.log(ev.data)
});

SharedWorker

我们可以在浏览器地址栏里面输入 `chrome://inspect，然后在侧边栏选中shared workers了，就可以看到浏览器，目前在运行的所有worker。点击inspect会打开一个开发者工具，然后就可以看到输出的log了
注意：如果要使 SharedWorker 连接到多个不同的页面，这些页面必须是同源的（相同的协议、host 以及端口）。
worker.js

var portList = [];

onconnect = function(e) {
    console.log('e', e)
    var port = e.ports[0];
    ensurePorts(port);
    port.onmessage = function(e) {
        var data = e.data;
        disptach(port, data);
    };
    port.start();
};
// 创建所有workder
function ensurePorts(port) {
    if (portList.indexOf(port) < 0) {
        portList.push(port);
    }
}
// 发送其他页面
function disptach(selfPort, data) {
    console.log('portList', portList)
    console.log('selfPort', selfPort)
    console.log('data', data)
    portList
        .filter(port => selfPort !== port)
        .forEach(port => port.postMessage(data));
}

page1

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>BroadcastChannel Page 1</title>
</head>
<body>
    <h3>Page 1</h3>
    <section style="margin-top:50px; text-align: center">
    <input id="inputMessage" value="page 1的测试消息" />
    <input type="button" value="发送消息" id="btnSend" />
    <section id="messages">
        <p>收到的消息：</p>
    </section>
    </section>

    <script src="./worker.js"></script>
    <script>
    var messagesEle = document.getElementById("messages");
    var messageEl = document.getElementById("inputMessage");
    var btnSend = document.getElementById("btnSend");
    //

    if (!window.SharedWorker) {
        alert("浏览器不支持SharedWorkder!");
    } else {
        var myWorker = new SharedWorker("./worker.js");
        // 监听数据
        myWorker.port.onmessage = function(e) {
        console.log('page1', e)
        var msgEl = document.createElement("p");
        var data = e.data;
        msgEl.innerText = data.date + " " + data.from + ":" + data.message;
        messagesEle.appendChild(msgEl);
        };

        btnSend.addEventListener("click", function() {
        var message = messageEl.value;
        // 发送数据
        myWorker.port.postMessage({
            date: new Date().toLocaleString(),
            message,
            from: "page 1"
        });
        });

        myWorker.port.start();
    }
    </script>
</body>
</html>

page2

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>BroadcastChannel Page 1</title>
</head>
<body>
    <h3>Page 2</h3>
    <section style="margin-top:50px; text-align: center">
    <input id="inputMessage" value="page 1的测试消息" />
    <input type="button" value="发送消息" id="btnSend" />
    <section id="messages">
        <p>收到的消息：</p>
    </section>
    </section>

    <script src="./worker.js"></script>
    <script>
    var messagesEle = document.getElementById("messages");
    var messageEl = document.getElementById("inputMessage");
    var btnSend = document.getElementById("btnSend");
    //

    if (!window.SharedWorker) {
        alert("浏览器不支持SharedWorkder!");
    } else {
        var myWorker = new SharedWorker("./worker.js");

        myWorker.port.onmessage = function(e) {
        console.log('page2', e)
        var msgEl = document.createElement("p");
        var data = e.data;
        msgEl.innerText = data.date + " " + data.from + ":" + data.message;
        messagesEle.appendChild(msgEl);
        };

        btnSend.addEventListener("click", function() {
        var message = messageEl.value;

        var message = messageEl.value;

        myWorker.port.postMessage({
            date: new Date().toLocaleString(),
            message,
            from: "page 2"
        });
        });

        myWorker.port.start();
    }
    </script>
</body>
</html>

MessageChannel

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