使用javascript链接mqtt协议（自动重连问题）

由于以前是在rabbitmq的插件“RabbitMQ Web MQTT plugin ”中看到使用了mqttws31.js的实例，因为对mqttws31不了解，网上下载了链接成功，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.经过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，因而去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"});