使用javascript连接mqtt协议（自动重连问题）

因为之前是在rabbitmq的插件“RabbitMQ Web MQTT plugin ”中看到使用了mqttws31.js的实例，由于对mqttws31不了解，网上下载了连接成功，但断开后不能自动重连。最后去官方看下了下iusue（https://github.com/eclipse/paho.mqtt.javascript/issues/48），提到：

1.定时器自动重连

2.通过reconnent参数实现自动重连。

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

采用第二种方式的时候报错了，查看了mqttws31.js源码确实不太正确，于是去github上找了下，才发现有一个“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"});