Function triggerOnload

src/system-core.js:60–64

(loader, load, err, isErrSource)

  return load.id;
}
function triggerOnload (loader, load, err, isErrSource) {
  loader.onload(err, load.id, load.d && load.d.map(loadToId), !!isErrSource);
  if (err)
    throw err;
}

var lastRegister;
systemJSPrototype.register = function (deps, declare, metas) {