Function timeout

test/angular/1.7/angular.js:21581–21611

* @ngdoc service * @name $timeout * * @description * AngularJS's wrapper for `window.setTimeout`. The `fn` function is wrapped into a try/catch * block and delegates any exceptions to * ng.$exceptionHandler $exceptionHandler service. * * The return val

(fn, delay, invokeApply)

     *
     */
    function timeout(fn, delay, invokeApply) {
      if (!isFunction(fn)) {
        invokeApply = delay;
        delay = fn;
        fn = noop;
      }

      var args = sliceArgs(arguments, 3),
          skipApply = (isDefined(invokeApply) && !invokeApply),
          deferred = (skipApply ? $$q : $q).defer(),
          promise = deferred.promise,
          timeoutId;

      timeoutId = $browser.defer(function() {
        try {
          deferred.resolve(fn.apply(null, args));
        } catch (e) {
          deferred.reject(e);
          $exceptionHandler(e);
        } finally {
          delete deferreds[promise.$$timeoutId];
        }

        if (!skipApply) $rootScope.$apply();
      }, delay, '$timeout');

      promise.$$timeoutId = timeoutId;
      deferreds[timeoutId] = deferred;

      return promise;
    }


    /**