let device1status = context.get('device1status') || "off";
let device2status = context.get('device2status') || "off";
deviceStatus = msg.payload;
if(msg.topic === "device1")
{
context.set('device1status', deviceStatus);
device1status = deviceStatus;
}
else if(msg.topic === "device2")
{
context.set('device2status', deviceStatus);
device2status = deviceStatus;
}
//下面的不用改
if 。。。。。
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