Layui Menu菜单默认收缩

原来展开的代码：

  <div class="layui-panel">
                        <ul class="layui-menu" id="docDemoMenu1">
                           <li class="layui-menu-item-group layui-menu-item-down" lay-options="{type: 'group'}">
                                <div class="layui-menu-body-title">
                                    menu item 3 group <i class="layui-icon layui-icon-up"></i>
                                </div>
                                <ul>
                                    <li lay-options="{id: 1031}">menu item 3-1</li>
                                    <li lay-options="{id: 1032}">
                                        <div class="layui-menu-body-title">menu item 3-2</div>
                                    </li>
                                </ul>
                            </li>
                           
                        </ul>
                    </div>

把li标签里的layui-menu-item-down 改成layui-menu-item-up就行了。