mqtt网页显示数据

admin 3月前 118

<body>
<meta charset="utf-8">
<input id="_message" width="300px" height="200px">
<button id="_sendBtn">发送消息</button>
<div id="div1"></div><br>
<div id="div2"></div><br>
<div id="div3"></div><br>
</body>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js" ></script>
<script src="https://unpkg.com/mqtt/dist/mqtt.min.js" ></script>
<script src="https://cdn.bootcdn.net/ajax/libs/mqtt/4.1.0/mqtt.min.js" ></script>
<script type="text/javascript">
    $(function () {
        const options = {
            clean: true,
            connectTimeout: 4000,
            clientId: 'client_id',
            username: "web-html",
            password: 'no'
        }
        const connectUrl = 'ws://qwtz.net:8083/mqtt'
        const client = mqtt.connect(connectUrl, options);
        //当重新连接启动触发回调
        client.on('reconnect', () => {
            $("#div1").text("正在重连.....");
        });
        //连接断开后触发的回调
        client.on("close",function () {
            $("#div1").text("客户端已断开连接.....");
        });
        //从broker接收到断开连接的数据包后发出。MQTT 5.0特性
        client.on("disconnect",function (packet) {
            console.log("从broker接收到断开连接的数据包....."+packet);
        });
        //客户端脱机下线触发回调
        client.on("offline",function () {
            $("#div1").text("客户端脱机下线.....");
        });
        //当客户端无法连接或出现错误时触发回调
        client.on("error",(error) =>{
            $("#div1").text("客户端出现错误....."+error);
        });
        //当客户端发送任何数据包时发出。这包括published()包以及MQTT用于管理订阅和连接的包
        client.on("packetsend",(packet)=>{
            /**
             *  packet包数据格式
             *
             * cmd: "publish"
             * dup: false
             * messageId: 18467
             * payload: "111"
             * qos: 2
             * retain: false
             * topic: "/tra_topic"
             */
            console.log("客户端已发出数据包....."+packet.payload);
        });
        //当客户端接收到任何数据包时发出。这包括来自订阅主题的信息包以及MQTT用于管理订阅和连接的信息包
        client.on("packetreceive",(packet)=>{
            console.log(packet);
        });
        //成功连接后触发的回调
        client.on("connect",function (connack) {
            $("#div1").text("成功连接上服务器"+new Date());
            /**
             * 订阅某主题
             * client.subscribe(topic/topic array/topic object, [options], [callback])
             * topic:一个string类型的topic或者一个topic数组,也可以是一个对象
             * options
             */
            client.subscribe("/dht/#",{qos:2});
        });
        $("#_sendBtn").on('click',function () {
            //发布数据
            var message = $("#_message").val();
            if (message==''){
                alert("请输入发送内容");
                return;
            }
            client.publish("/dht/1",message,{qos:2});
            $("#div2").text("发送成功");
            $("#_message").val("");
        })
        //当客户端接收到发布消息时触发回调
        /**
         * topic:收到的数据包的topic
         * message:收到的数据包的负载playload
         * packet:收到的数据包
         */
        client.on('message', (topic, message,packet) => {
            $("#div3").text("客户端收到订阅消息,topic="+topic+";消息数据:"+message+";数据包:"+packet);
        });
        //页面离开自动断开连接
        $(window).bind("beforeunload",()=>{
            $("#div1").text("客户端窗口关闭,断开连接");
            client.disconnect();
        })
    });
</script>


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