代码：

Question

我正在尝试在Web应用程序中使用Paho库，但是脚本src = ...标记后的所有内容均未执行。有人可以帮我吗？

代码：

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title>Temperature and Pressures</title>
    <h1>Temperatures and Pressures</h1>
    <script> console.log('start'); </script>
</head>
<body>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/paho-mqtt/1.0.2/mqttws31.min.js" type="text/javascript">
        console.log('Hello');
        host = "broker.hivemq.com";
        port = 8000;
        clientId = "clientId-" + parseInt(Math.random() * 100);
        console.log("connecting to " + host);

        var client = new Paho.MQTT.Client(host, Number(port), clientId);

        client.onConnectionLost = onConnectionLost;
        client.onMessageArrived = onMessageArrived;
        client.connect({onSuccess:onConnect});

        function onConnect() {
            // Once a connection has been made, make a subscription and send a message.
            console.log("onConnect");
            //subsribe to topics...
            };

        function onConnectionLost(responseObject) {
            if (responseObject.errorCode !== 0)
            console.log("onConnectionLost:"+responseObject.errorMessage);
            };

        function onMessageArrived(message) {
            console.log("onMessageArrived:"+message.payloadString);
            client.disconnect(); 
            };

    </script>
</body>
</html>

在控制台中记录的唯一消息是“开始”

Web应用程序中的Paho：<script src =“ ...” type =“ text / javascipt>

代码：

0 个答案: