l-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-expand"></i><span>fa-expand</span></li>
                <li class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-fast-backward"></i><span>fa-fast-backward</span></li>
                <li class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa fa-fast-forward"></i><span>fa-fast-forward</span></li>
                <li class='layui-col-xs4 layui-col-sm3 layui-col-md2 layui-col-lg1 '><i class="fa 