-options="{type: 'group', isAllowSpread: false}">
                <div class="layui-menu-body-title">menu group 2</div>
                <ul>
                  <li class="layui-menu-item-checked">
                    <div class="layui-menu-body-title">menu item 3-2-1</div>
                  </li>
                  <li><div class="layui-menu-body-title">menu item 3-2-2</div></li>
                </ul>
              </li>
              <li><div class="layui-menu-body-title">menu item 3-3</div></li>
           