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：
1 <div class="treemenu"> 2 <ul> 3 <li> 4 <a href="#" id="treemenu_a_1">一级菜单一</a> 5 <div class="submenu" id="submenu_1"> 6 <ul> 7 <li><a href="subpage/a.html" id="submenu_a_1_1">二级菜单一</a></li> 8 <li><a href="subpage/b.html" id="submenu_a_1_2">二级菜单二</a></li> 9 <li><a href="#" id="submenu_a_1_3">二级菜单三</a></li> 10 <li><a href="#" id="submenu_a_1_4">二级菜单四</a></li> 11 <li><a href="#" id="submenu_a_1_5">二级菜单五</a></li> 12 </ul> 13 </div> 14 </li> 15 <li> 16 <a href="#" id="treemenu_a_2">一级菜单二</a> 17 <div class="submenu" id="submenu_2"> 18 <ul> 19 <li> 20 <a href="#" id="submenu_a_2_1">二级菜单一</a> 21 <div class="submenu" id="submenu_2_1"> 22 <ul> 23 <li><a href="#" id="submenu_a_2_1_1">三级菜单一</a></li> 24 <li><a href="#" id="submenu_a_2_1_2">三级菜单二</a></li> 25 <li> 26 <a href="#" id="submenu_a_2_1_3">三级菜单三</a> 27 <div class="submenu" id="submenu_2_1_3"> 28 <ul> 29 <li><a href="#" id="submenu_a_2_1_3_1">四级菜单一</a></li> 30 <li><a href="#" id="submenu_a_2_1_3_2">四级菜单二</a></li> 31 <li><a href="#" id="submenu_a_2_1_3_3">四级菜单三</a></li> 32 </ul> 33 </div> 34 </li> 35 </ul> 36 </div> 37 </li> 38 <li><a href="#" id="submenu_a_2_2">二级菜单二</a></li> 39 <li><a href="#" id="submenu_a_2_3">二级菜单三</a></li> 40 <li><a href="#" id="submenu_a_2_4">二级菜单四</a></li> 41 <li><a href="#" id="submenu_a_2_5">二级菜单五</a></li> 42 </ul> 43 </div> 44 </li> 45 <li> 46 <a href="#" id="treemenu_a_3">一级菜单三</a> 47 <div class="submenu" id="submenu_3"> 48 <ul> 49 <li><a href="#" id="submenu_a_3_1">二级菜单一</a></li> 50 <li><a href="#" id="submenu_a_3_2">二级菜单二</a></li> 51 <li><a href="#" id="submenu_a_3_3">二级菜单三</a></li> 52 <li><a href="#" id="submenu_a_3_4">二级菜单四</a></li> 53 <li><a href="#" id="submenu_a_3_5">二级菜单五</a></li> 54 </ul> 55 </div> 56 </li> 57 </ul> 58 </div>
读取cookie工具类：
1 //cookie工具类
2 var cookieTool = {
3 //读取cookie
4 getCookie: function(c_name) {
5 if (document.cookie.length > 0) {
6 c_start = document.cookie.indexOf(c_name + "=");
7 if (c_start != -1) {
8 c_start = c_start + c_name.length + 1;
9 c_end = document.cookie.indexOf(";", c_start);
10 if (c_end == -1) {
11 c_end = document.cookie.length;
12 }
13 return unescape(document.cookie.substring(c_start, c_end));
14 }
15 }
16 return "";
17 },
18 //设置cookie
19 setCookie: function(c_name, value, expiredays) {
20 var exdate = new Date();
21 exdate.setDate(exdate.getDate() + expiredays); //设置日期
22 document.cookie = c_name + "=" + escape(value) + ((expiredays == null) ? "" : ";expires=" + exdate.toGMTString());
23 },
24 //删除cookie
25 delCookie: function(c_name) {
26 var exdate = new Date();
27 exdate.setDate(exdate.getDate() - 1); //昨天日期
28 document.cookie = c_name + "=;expires=" + exdate.toGMTString();
29 }
30 };
菜单事件绑定：
1 //菜单事件绑定
2 $(‘.treemenu a‘).bind(‘click‘, function() {
3 var $this = $(this);
4 var id = $this.attr(‘id‘);
5 var $submenu = $this.next(‘.submenu‘);
6 if ($submenu.length > 0) { //是否有子菜单
7 var flag = $(this).next(‘.submenu:hidden‘).length > 0 ? true : false;
8 if (flag) {
9 $submenu.show();
10 } else {
11 $submenu.hide();
12 }
13 var display = flag ? ‘block‘ : ‘none‘;
14 cookieTool.setCookie(id, display, 10);
15 } else {
16 cookieTool.setCookie(id, id, 10);
17 var curId = cookieTool.getCookie(id);
18 $(‘.treemenu‘).find(‘.on‘).removeClass(‘on‘).addClass(‘off‘);
19 $(‘#‘ + curId).addClass(‘on‘);
20 $(‘.treemenu a[class="off"]‘).each(function() {
21 cookieTool.delCookie($(this).attr(‘id‘)); //删除其他已选择选项cookie
22 });
23 }
24 });
页面加载时重新设置菜单
1 //页面加载读取cookies
2 $(‘.treemenu a‘).each(function() {
3 showMenu($(this).attr(‘id‘));
4 });
5
6
7 //读取cookie显示菜单
8 function showMenu(id) {
9 var $this = $(‘#‘ + id);
10 var cookie = cookieTool.getCookie(id);
11 if (cookie) {
12 if ($this.next(‘.submenu‘).length > 0) {
13 $this.next(‘.submenu‘).css(‘display‘, cookie);
14 } else {
15 $(‘#‘ + cookie).addClass(‘on‘);
16 }
17 }
18 }
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
时间： 2024-10-12 04:54:13