关于mqtt+js前端中mqtt服务器关闭重连服务器后js前端接收不到消息的问题

	const MQTT_OPTIONS = {
  	  connectTimeout: 10000,
   	  clientId: '',
   	  username: 'admin',
  	  password: 'public',
 	  clean: true,
	}

	connectMqtt1() {
        MQTT_OPTIONS.clientId = v4.v4()//引入uuid库
        const client = mqtt.connect("ws://172.16.40.118:8083/mqtt", MQTT_OPTIONS)
        client.on("connect", () => {
            client.subscribe("M3/#", (err) => {
                if (!err) {
                    console.log('订阅成功!')
                }
            })
        }).on('reconnect', (err) => {
            console.log('正在重连...' + this.topic)
            client.subscribe("M3/#")//这一行最关键，需要在重连成功后再次订阅该主题！这样便不会出现重连mqtt服务器接收不到消息的问题
        }).on('end', (err) => {
            console.log('连接断开!')
        }).on("message", (topic, message) => {
            // console.log("topic: ", topic)
            try {
            //使用try...catch...可以将无法转成json串的异常进行捕获，不影响正常程序运行
                let data = JSON.parse(message)
				//接下来处理接收到的消息
            } catch (e) {
                console.log("Caught: " + e.message)
            }
        })
    }