使用javascript鏈接mqtt協議（自動重連問題）

由於以前是在rabbitmq的插件「RabbitMQ Web MQTT plugin 」中看到使用了mqttws31.js的實例，因爲對mqttws31不瞭解，網上下載了鏈接成功，但斷開後不能自動重連。最後去官方看下了下iusue（https://github.com/eclipse/paho.mqtt.javascript/issues/48），提到：

1.定時器自動重連
2.經過reconnent參數實現自動重連。

client.connect(
            {
                cleanSession : false, 
                onSuccess : onConnectSuccess, 
                onFailure : onFailedConnect, 
                keepAliveInterval: 30, 
                reconnect : true,         // Enable automatic reconnect
                reconnectInterval: 10     // Reconnect attempt interval : 10 seconds
            }
        );

採用第二種方式的時候報錯了，查看了mqttws31.js源碼確實不太正確，因而去github上找了下，才發現有一個「automatic-reconnect」分支：
https://github.com/eclipse/paho.mqtt.javascript/blob/automatic-reconnect/src/mqttws31.js

connectOptions = connectOptions || {} ;
            validate(connectOptions,  {timeout:"number",
                                       userName:"string",
                                       password:"string",
                                       willMessage:"object",
                                       keepAliveInterval:"number",
                                       cleanSession:"boolean",
                                       useSSL:"boolean",
                                       invocationContext:"object",
                                       onSuccess:"function",
                                       onFailure:"function",
                                       hosts:"object",
                                       ports:"object",
                                       reconnect:"boolean",
mqttVersion:"number"});