js 通过cookie实现刷新不变化树形菜单

通过设置cookie来保存树形菜单的状态，在页面加载时重新读取cookie来设置菜单。

菜单的HTML结构：

<div> <ul> <li> <a href="#">一级菜单一</a> <div> <ul> <li><a href="https://www.jb51.net/subpage/a.html">二级菜单一</a></li> <li><a href="https://www.jb51.net/subpage/b.html">二级菜单二</a></li> <li><a href="#">二级菜单三</a></li> <li><a href="#">二级菜单四</a></li> <li><a href="#">二级菜单五</a></li> </ul> </div> </li> <li> <a href="#">一级菜单二</a> <div> <ul> <li> <a href="#">二级菜单一</a> <div> <ul> <li><a href="#">三级菜单一</a></li> <li><a href="#">三级菜单二</a></li> <li> <a href="#">三级菜单三</a> <div> <ul> <li><a href="#">四级菜单一</a></li> <li><a href="#">四级菜单二</a></li> <li><a href="#">四级菜单三</a></li> </ul> </div> </li> </ul> </div> </li> <li><a href="#">二级菜单二</a></li> <li><a href="#">二级菜单三</a></li> <li><a href="#">二级菜单四</a></li> <li><a href="#">二级菜单五</a></li> </ul> </div> </li> <li> <a href="#">一级菜单三</a> <div> <ul> <li><a href="#">二级菜单一</a></li> <li><a href="#">二级菜单二</a></li> <li><a href="#">二级菜单三</a></li> <li><a href="#">二级菜单四</a></li> <li><a href="#">二级菜单五</a></li> </ul> </div> </li> </ul> </div>

读取cookie工具类：

//cookie工具类 var cookieTool = { //读取cookie getCookie: function(c_name) { 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：

//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 }); } });

页面加载时重新设置菜单

//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'); } } }

完整DEMO：

【JavaScript】刷新不变化树形菜单(多级菜单).zip

注意：chrome本地控制台无法读取cookie，需要在firefox/IE或者服务器环境下测试

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