javascript实现操作cookie实现的可记忆菜单

时间：2022-02-04 08:54:02|栏目：JavaScript代码|点击：次

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>可记忆菜单</title> <style type="text/css"> body {font:12px Tahoma, sans-serif;color:#4D4D4D;margin:0px; text-align:center} a{color:#4D4D4D;text-decoration:none} a:hover{color:#AD0000;text-decoration:none} #menu {width:160px;margin:0px;padding:0px;text-align:left;list-style:none;border:1px solid #B0D4ED} #menu .item {margin:0px;padding:0px;list-style:none; text-align:center} a.title:link,a.title:visited,a.title:hover {display:block;height:30px;line-height:30px; margin-top:1px;background:#E1F2FD;border-top:1px solid     #B0D4ED;border-bottom:1px solid #B0D4ED;font-weight:bold;} #menu .item ul {margin:0;list-style:none;display:none;text-align:center} #menu .item ul li {height:24px;line-height:22px;border-bottom:1px solid #BFDBEE;margin:0 20px} </style> <script language="javascript" type="text/javascript"> // --- 获取ClassName document.getElementsByClassName = function(cl) {     var retnode = [];     var myclass = new RegExp('\\b'+cl+'\\b');     var elem = this.getElementsByTagName('*');     for (var j = 0; j < elem.length; j++) {         var classes = elem[j].className;         if (myclass.test(classes)) retnode.push(elem[j]);     }     return retnode; } // --- 隐藏所有 function HideAll() {     var items = document.getElementsByClassName("optiton");     for (var j=0; j<items.length; j++) {         items[j].style.display = "none";     } } // --- 设置cookie function setCookie(sName,sValue,expireHours) {     var cookieString = sName + "=" + escape(sValue);     //;判断是否设置过期时间     if (expireHours>0) {          var date = new Date();          date.setTime(date.getTime + expireHours * 3600 * 1000);          cookieString = cookieString + "; expire=" + date.toGMTString();     }     document.cookie = cookieString; } //--- 获取cookie function getCookie(sName) {   var aCookie = document.cookie.split("; ");   for (var j=0; j < aCookie.length; j++){     var aCrumb = aCookie[j].split("=");     if (escape(sName) == aCrumb[0])       return unescape(aCrumb[1]);   }   return null; } window.onload = function() {     var show_item = "opt_1";     if (getCookie("show_item") != null) {          show_item= "opt_" + getCookie("show_item");     }     document.getElementById(show_item).style.display = "block";     var items = document.getElementsByClassName("title");     for (var j=0; j<items.length; j++) {         items[j].onclick = function() {             var o = document.getElementById("opt_" + this.name);             if (o.style.display != "block") {                 HideAll();                 o.style.display = "block";                 setCookie("show_item",this.name);             }             else {                 o.style.display = "none";             }         }     } } </script> </head> <body> <ul id="menu">     <li class="item"><a href="javascript:void(0)" class="title" name="1">菜单选项一</a>       <ul id="opt_1" class="optiton">           <li><a href="#">子菜单一</a></li>           <li><a href="#">子菜单二</a></li>           <li><a href="#">子菜单三</a></li>           <li><a href="#">子菜单四</a></li>       </ul>     </li>     <li class="item"><a href="javascript:void(0)" class="title" name="2">菜单选项二</a>       <ul id="opt_2" class="optiton">           <li><a href="#">子菜单一</a></li>           <li><a href="#">子菜单二</a></li>           <li><a href="#">子菜单三</a></li>           <li><a href="#">子菜单四</a></li>       </ul>     </li>     <li class="item"><a href="javascript:void(0)" class="title" name="3">菜单选项三</a>       <ul id="opt_3" class="optiton">           <li><a href="#">子菜单一</a></li>           <li><a href="#">子菜单二</a></li>           <li><a href="#">子菜单三</a></li>           <li><a href="#">子菜单四</a></li>       </ul>     </li>     <li class="item"><a href="javascript:void(0)" class="title" name="4">菜单选项四</a>       <ul id="opt_4" class="optiton">           <li><a href="#">子菜单一</a></li>           <li><a href="#">子菜单二</a></li>           <li><a href="#">子菜单三</a></li>           <li><a href="#">子菜单四</a></li>       </ul>     </li> </ul>     </body> </html>

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