baozhida-logistics-app/node_modules/debug/example/worker.js

// DEBUG=* node example/worker
// DEBUG=worker:* node example/worker
// DEBUG=worker:a node example/worker
// DEBUG=worker:b node example/worker

var a = require('../')('worker:a')
  , b = require('../')('worker:b');

function work() {
  a('doing lots of uninteresting work');
  setTimeout(work, Math.random() * 1000);
}

work();

function workb() {
  b('doing some work');
  setTimeout(workb, Math.random() * 2000);
}

workb();