<div class="sidebar-nav navbar-collapse ">
    <ul class="nav nav_1" id="side-menu">
        <li class="left_button"><a href="index"><i
                class="fa fa-dashboard fa-fw "></i> 欢迎</a></li>
        <c:if test="${ menuList ne null }">
            <c:forEach var="menu" items="${ menuList }">
                <li class="left_button"><a href="#"><i class="fa fa-fw"></i>${ menu.name }<span
                        class="fa arrow"></span></a>
                    <ul class="nav nav-second-level">
                        <c:if test="${ menu.subList ne null }">
                            <c:forEach var="menuItem" items="${ menu.subList }">
                                <li class="left_button_2" title="${ menuItem.remark }"><a
                                    href="${ menuItem.action }" class="left_button_2_fount">${ menuItem.name }</a></li>
                            </c:forEach>
                        </c:if>
                    </ul></li>
            </c:forEach>
        </c:if>
    </ul>
</div>
<!-- /.sidebar-collapse -->

上面的left_button不可以，下面的left_button可以