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：

 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cookie19     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cookie25     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cookie22             });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