class="fa fa-undo"></i><span>fa-undo</span></li>
                <li class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-outdent"></i><span>fa-outdent</span></li>
                <li class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-indent"></i><span>fa-indent</span></li>
                <li class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-list"></i><span>fa-list</span></li>
                <li class='layui-col-xs4 l