左侧的JS后台折叠菜单，支持Cookie保存

2024-09-05 12:19:56

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一款可以用到后台管理的左侧的JS折叠菜单，而且加入主Cookies技术，使得操作项可以适时保存，也就是当您刷新页面的时候，你上次打开菜单的当前项不会改变，直至Cookies失效为止。而且它的外观也挺漂亮的，相信开发网站的朋友会用得上。

<!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" xml:lang="UTF-8" lang="UTF-8"><head> <title>后台管理菜单</title> <style type="text/css"> body {margin:0;text-align:center;color:#000;font:normal 12px Arial,Verdana,Tahoma;text-align:center;background:#C8D0D5;line-height:150%;} a:link,a:visited {color:#385065;text-decoration:none} a:hover {text-decoration:underline} #menu {width:150px;margin:0px 15px;padding:0px;text-align:left;list-style:none} #menu .item {margin:5px 0px;padding:0px;list-style:none} a.title:link, a.title:visited, a.title:hover {display:block;background:url(/jscss/demoimg/200906/m201.gif) no-repeat;color:#385065;font-weight:bold;padding:2px 0 0 22px;width:128px;line-height:23px;cursor:pointer;text-decoration:none} #menu .item ul {border:1px solid #9FACB7;margin:0;width:118px;padding:3px 0px 3px 30px;background:#fff;list-style:none;display:none} #menu .item ul li {display:block;} </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">网站设置   <ul id="opt_1" class="optiton">    <li>基本设置</li>    <li>高级设置</li>   </ul> </li> <li class="item">生成管理   <ul id="opt_2" class="optiton">    <li>生成首页</li>    <li>生成列表</li>   </ul> </li> <li class="item">系统管理   <ul id="opt_3" class="optiton">    <li>会员管理</li>    <li>管理员设置</li>    <li>退出系统</li>   </ul> </li></ul></body></html>

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