code: function _set(n) {
          if (!started) {
            return;
          }
          var pct = (n * 100) + '%';
          loadingBar.css('width', pct);
          status = n;
  
          // increment loadingbar to give the illusion that there is always
          // progress but make sure to cancel the previous timeouts so we don't
          // have multiple incs running at the same time.
          if (autoIncrement) {
            $timeout.cancel(incTimeout);
            incTimeout = $timeout(function() {
              _inc();
            }, 250);
          }
        }
docs: Set the loading bar's width to a certain percent.
  
  @param n any value between 0 and 1