code: function (appendTo, options) {
              options = options || {};
              if (isObject(appendTo) && appendTo instanceof Backbone.$ === false && !_.isElement(appendTo)) {
                  options = appendTo;
                  appendTo = options.appendTo;
              }
              return this._render(this.subViews, appendTo || true, options.clearLocations);
          }
docs: Renders subviews and appends them to their 'locations' if they have one.
  If you pass a appendTo param, views are appended to that location instead.
  This is just a shortcut version of renderAppend({})
  @memberOf SubViewManager#
  @type {SubViewManager}
  @param {string|HTMLElement|$} [appendTo]
  Location to append the rendered subiews to
  @param {object} [options]
  @param {boolean} [options.clearLocations=false] Clear configured locations of subviews before rendering
  @return {SubViewManager}