树莓派Node-Red例2:手动闪烁LED

 新建网页,在地址栏输入 http://172.16.0.12:1880/ui

 

 

var count = context.get('count')||0;
var temp;
count += 1;
if((count%2)===0)
 {
  temp=1;
 }
 else
 {
  temp=0;
 } 
 context.set('count',count);
 msg.payload=temp;
 return msg;