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我的机器上运行着 mosquitto MQTT 代理。我想从浏览器运行 MQTT 客户端。这是我在 Django 应用程序中所做的：

<html>
  <head>
    <title>Mosquitto Websockets</title>
    {% load staticfiles %}
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="{% static 'js/mqttws31-min.js' %}" type="text/javascript"></script>
    <script src="{% static 'js/jquery.min.js' %}" type="text/javascript"></script>
    <script src="{% static 'js/config.js' %}" type="text/javasacript"></script>
    <script type="text/javascript">
    var mqtt;
    var reconnectTimeout = 2000;

    function MQTTconnect() {
        host = 'test.mosquitto.org';
        port = 8080;
        useTLS = false;
        cleansession = true;
        username = null;
        password = null;
        mqtt = new Paho.MQTT.Client(host, port,
                    "myclientid_" + parseInt(Math.random() * 100, 10));

        /*mqtt = new Messaging.Client(
                        host,
                        port,
                        "web_" + parseInt(Math.random() * 100,
                        10));
        */
        var options = {
            timeout: 3,
            useSSL: useTLS,
            cleanSession: cleansession,
            onSuccess: onConnect,
            onFailure: function (message) {
                $('#status').val("Connection failed: " + message.errorMessage + "Retrying");
                setTimeout(MQTTconnect, reconnectTimeout);
            }
        };

        mqtt.onConnectionLost = onConnectionLost;
        mqtt.onMessageArrived = onMessageArrived;

        if (username != null) {
            options.userName = username;
            options.password = password;
        }
        console.log("Host="+ host + ", port=" + port + " TLS = " + useTLS + " username=" + username + " password=" + password);
        mqtt.connect(options);
    }

    function onConnect() {
        $('#status').val('Connected to ' + host + ':' + port);
        // Connection succeeded; subscribe to our topic
        mqtt.subscribe(topic, {qos: 0});
        $('#topic').val(topic);
    }

    function onConnectionLost(response) {
        setTimeout(MQTTconnect, reconnectTimeout);
        $('#status').val("connection lost: " + responseObject.errorMessage + ". Reconnecting");

    };

    function onMessageArrived(message) {

        var topic = message.destinationName;
        var payload = message.payloadString;

        $('#ws').prepend('<li>' + topic + ' = ' + payload + '</li>');
    };


    $(document).ready(function() {
        MQTTconnect();
    });

    </script>
  </head>
  <body>
    <h1>Mosquitto Websockets</h1>
    <div>
        <div>Subscribed to <input type='text' id='topic' disabled />
        Status: <input type='text' id='status' size="80" disabled /></div>

        <ul id='ws' style="font-family: 'Courier New', Courier, monospace;"></ul>
    </div>
  </body>

在此处输入图像描述 它成功连接到 test.mosquitto.org:8080。我订阅了#，但它无法检索已发布的消息。我认为函数 onMessageArrived(message) 不起作用。控制台中没有错误，因此无法识别任何错误。请问有什么帮助吗？

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