zone-run-withcomment.js

var zoneA = Zone.current.fork({name: 'zoneA'});

function callback() {
  // _currentZoneFrame: {zone: zoneA, parent: rootZoneFrame}
  console.log('callback is invoked in context', Zone.current.name); 
}

// _currentZoneFrame = rootZoneFrame = {zone: root, parent: null}
zoneA.run(function() {
  // _currentZoneFrame: {zone: zoneA, parent: rootZoneFrame}
  console.log('I am in context', Zone.current.name); 
  setTimeout(zoneA.wrap(callback), 100);
});