JS利用cookie记录当前位置实现刷新页面后还可以保持菜单栏的展开或闭合

代码如下，重点是JS部分的代码（部分样式引用的是Bootstrapt中的）：

<style>
    .sidebar-menu .special{
        font-size: 16px;
        margin-bottom:6px;
    }
    .sidebar-menu ul,li{padding:0;margin:0;}
    .sidebar-menu .black{
        background-color:#2c3b41;
    }
    .sidebar-menu .size{
        font-size: 18px;
    }
</style>

<div class="treemenu">
<ul class="sidebar-menu">
    <li class="header">主菜单</li>

    <!--基本信息查询-->
    <li class="treeview">
        <a href="#" id="treemenu_a_2"><i class="glyphicon glyphicon-search"></i>  <span class="size"> 基本信息查询</span>
                    <span class="pull-right-container">
                      <i class="fa fa-angle-left pull-right"></i>
                    </span>
        </a>
        <div class="submenu" id="submenu_2">
            <ul class="black">
                <li class="special" ><a href="/searchCor.html" id="submenu_a_2_1"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 尾矿库信息查询 </a></li>
            </ul>
        </div>
    </li>
    <!--地理信息查询-->
    <li class="treeview">
        <a href="#" id="treemenu_a_8"><i class="fa fa-database"></i>  <span class="size"> 地理信息查询</span>
                    <span class="pull-right-container">
                      <i class="fa fa-angle-left pull-right"></i>
                    </span>
        </a>
        <div class="submenu" id="submenu_8">
            <ul class="black">
                <li class="special" ><a href="" onclick="window.open('/baseGeoInfo.html')" id="submenu_a_8_1"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i>基础地理信息</a></li>
                <li class="special" ><a href="" onclick="window.open('/runInfo.html')" id="submenu_a_8_2"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i>运行动态信息</a></li>
                <li class="special" ><a href="" onclick="window.open('/helpInfo.html')" id="submenu_a_8_3"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i>应急救援信息</a></li>
                <li class="special" ><a href="" onclick="window.open('/accidentInfo.html')" id="submenu_a_8_4"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i>事故范围模拟</a></li>

            </ul>
        </div>
    </li>
    <!--基本信息管理-->
    <li class="treeview">
        <a href="#" id="treemenu_a_1"><i class="fa fa-database"></i>  <span class="size"> 基本信息管理</span>
                    <span class="pull-right-container">
                      <i class="fa fa-angle-left pull-right"></i>
                    </span>
        </a>
        <div class="submenu" id="submenu_1">
            <ul class="black">
                <li class="special" ><a href="/corInf.html" id="submenu_a_1_1"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 企业信息管理 </a></li>
                <li class="special" ><a href="/basicInf.html?p=1" id="submenu_a_1_2"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o" ></i> 尾矿库信息管理 </a></li>
                <li class="special" ><a href="/EngineeringInf.html?p=1" id="submenu_a_1_3"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 工程信息管理 </a></li>
                <li class="special" ><a href="/remediationInf.html" id="submenu_a_1_4"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 整治信息管理 </a></li>
                <li class="special" ><a href="/securityInf.html" id="submenu_a_1_5"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 安全现状信息管理 </a></li>
                <li class="special" ><a href="/emergencyinf.html" id="submenu_a_1_6"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 应急预案信息管理 </a></li>
                <li class="special" ><a href="/retireinf.html" id="submenu_a_1_7"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 退役信息管理 </a></li>
                <li class="special" ><a href="/intelligence.html" id="submenu_a_1_8"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 尾矿库建造许可证 </a></li>
                <li class="special" ><a href="/run.html" id="submenu_a_1_9"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o" ></i> 尾矿库运行许可证 </a></li>
                <li class="special" ><a href="/retired.html" id="submenu_a_1_10"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 尾矿库退役许可证 </a></li>
                <li class="special" ><a href="/importdata.html" id="submenu_a_1_11"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 批量信息导入 </a></li>
            </ul>
        </div>
    </li>
    <!--地理信息管理-->
    <li class="treeview">
        <a href="#" id="treemenu_a_5"><i class="glyphicon glyphicon-tasks"></i>  <span class="size"> 地理信息管理</span>
                    <span class="pull-right-container">
                      <i class="fa fa-angle-left pull-right"></i>
                    </span>
        </a>
        <div class="submenu" id="submenu_7">
            <ul>
                <li class="special" ><a href="" onclick="window.open('/getArcgisPoint.html')" id="submenu_a_7_1"><i>&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 获取路线点 </a></li>
                <li class="special" ><a href="" onclick="window.open('/getArcgis3DPoints.html')" id="submenu_a_7_2"><i>&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o" ></i> 获取路线点3D </a></li>
                <li class="special" ><a href="/relationManage.html" id="submenu_a_7_3"><i>&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 地图关系表管理 </a></li>
                <li class="special" ><a href="/DamRelationManage.html" id="submenu_a_7_7"><i>&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 地图干滩关系表管理 </a></li>
                <li class="special" ><a href="/ImportDamPoint.html" id="submenu_a_7_5"><i>&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 上传溃坝点状图 </a></li>
                <li class="special" ><a href="/gisdata.html"  id="submenu_a_7_8"><i>&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 尾矿库GIS可视化 </a></li>
            </ul>
        </div>
    </li>
    <!--路线规划-->
    <li class="treeview">
        <a href="#" id="treemenu_a_3"><i class="glyphicon glyphicon-road"></i>  <span class="size"> 路线图</span>
                    <span class="pull-right-container">
                      <i class="fa fa-angle-left pull-right"></i>
                    </span>
        </a>
        <div class="submenu" id="submenu_3">
            <ul class="black">
                <li class="special" ><a href="" onclick="window.open('/gdRoutePlan.html')" id="submenu_a_3_1"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 驾车路线图 </a></li>
                <li class="special" ><a href="" onclick="window.open('/walkRoutePlaning.html')" id="submenu_a_3_2"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o" ></i> 步行路线图 </a></li>
                <li class="special" ><a href="" onclick="window.open('/ridingRoutePlan.html')" id="submenu_a_3_3"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 骑车路线图 </a></li>

            </ul>
        </div>
    </li>
    <!--系统管理-->
    <li class="treeview">
        <a href="#" id="treemenu_a_6"><i class="glyphicon glyphicon-user"></i>  <span class="size"> 系统维护</span>
                    <span class="pull-right-container">
                      <i class="fa fa-angle-left pull-right"></i>
                    </span>
        </a>
        <div class="submenu" id="submenu_6">
            <ul class="black">
                <li class="special" ><a href="/user.html" id="submenu_a_6_1"><i>&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp</i><i class="fa fa-circle-o"></i> 用户管理 </a></li>
            </ul>
        </div>
    </li>

    <li class="treeview">
        <a href="/colorselection.html" >
            <i class=" glyphicon glyphicon-wrench"></i> <span class="size"> 颜色设置 </span>
            <span class="pull-right-container">
              <i class="fa fa-angle-left pull-right"></i>
            </span>
        </a>
    </li>
</ul>
</div>

<!--保持刷新后ul记忆.-->
<script>
    //cookie工具类
    var cookieTool = {
//读取cookie
        getCookie: function(c_name) {
         if(c_name==null){
             return "";
         } else if (document.cookie.length > 0) {
                c_start = document.cookie.indexOf(c_name + "=");
                if (c_start != -1) {
                    c_start = c_start + c_name.length + 1;
                    c_end = document.cookie.indexOf(";", c_start);
                    if (c_end == -1) {
                        c_end = document.cookie.length;
                    }
                    return unescape(document.cookie.substring(c_start, c_end));
                }
            }
            return "";
        },
//设置cookie
        setCookie: function(c_name, value, expiredays) {
            var exdate = new Date();
            exdate.setDate(exdate.getDate() + expiredays); //设置日期
            document.cookie = c_name + "=" + escape(value) + ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString());
        },
//删除cookie
        delCookie: function(c_name) {
            var exdate = new Date();
            exdate.setDate(exdate.getDate() - 1); //昨天日期
            document.cookie = c_name + "=;expires=" + exdate.toGMTString();
        }
    };
    //菜单事件绑定
    $('.treemenu a').bind('click', function() {
        var $this = $(this);
        var id = $this.attr('id');
        var $submenu = $this.next('.submenu');
        if ($submenu.length > 0) { //是否有子菜单
            var flag = $(this).next('.submenu:hidden').length > 0 ? true : false;
            if (flag) {
                $submenu.show();
            } else {
                $submenu.hide();
            }
            var display = flag ? 'block' : 'none';
            cookieTool.setCookie(id, display, 10);
        } else {
            cookieTool.setCookie(id, id, 10);
            var curId = cookieTool.getCookie(id);
            $('.treemenu').find('.on').removeClass('on').addClass('off');
            $('#' + curId).addClass('on');
            $('.treemenu a[class="off"]').each(function() {
                cookieTool.delCookie($(this).attr('id')); //删除其他已选择选项cookie
            });
        }
    });
    //页面加载读取cookies
    $('.treemenu a').each(function() {
        showMenu($(this).attr('id'));
    });

    //读取cookie显示菜单
    function showMenu(id) {
        var $this = $('#' + id);
        var cookie = cookieTool.getCookie(id);
        if (cookie) {
            if ($this.next('.submenu').length > 0) {
                $this.next('.submenu').css('display', cookie);
            } else {
                $('#' + cookie).addClass('on');
            }
        }
    }
</script>

效果图预览：

通过将展开信息记录在cookie中，实现刷新页面后还可以保持菜单栏的展开。第一次使用由于没有cookie记录会导致菜单全部展开，用过一次之后就可以实现记忆了。