本文实例讲述了JS实现适合于后台使用的动画折叠菜单效果。分享给大家供大家参考。具体如下：
这是一款适合于后台使用的动画折叠菜单，代码超简，无jQuery，展开与折叠效果平滑。本演示中有两组菜单，向大家展示如何在一个网页中布局两个菜单，整体效果以及兼容性还算可以，希望在实际应用中不会出现什么问题。
运行效果截图如下：
在线演示地址如下：
http://demo.VeVB.COm/js/2015/js-ht-control-animate-zd-menu-codes/
具体代码如下：
<!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=utf-8" /><title>适合于后台使用的动画折叠菜单</title><script type="text/javascript"> function FOLDMenu(id,onlyone){ if(!document.getElementById || !document.getElementsByTagName){return false;} this.menu=document.getElementById(id); this.submenu=this.menu.getElementsByTagName("ul"); this.speed=3; this.time=10; this.onlyone=onlyone==true?onlyone:false; this.links = this.menu.getElementsByTagName("a"); } FOLDMenu.prototype.init=function(){ var mainInstance = this; for(var i=0;i<this.submenu.length;i++){ this.submenu[i].getElementsByTagName("span")[0].onclick=function(){ mainInstance.toogleMenu(this.parentNode); }; } for(var i=0;i<this.links.length;i++){ this.links[i].onclick=function(){ this.className = "current"; mainInstance.removeCurrent(this); } } } FOLDMenu.prototype.removeCurrent = function(link){ for (var i = 0; i < this.links.length; i++){ if (this.links[i] != link){ this.links[i].className = " "; } } } FOLDMenu.prototype.toogleMenu=function(submenu){ if(submenu.className=="open"){ this.closeMenu(submenu); }else{ this.openMenu(submenu); } } FOLDMenu.prototype.openMenu=function(submenu){ var fullHeight=submenu.getElementsByTagName("span")[0].offsetHeight; var links = submenu.getElementsByTagName("a"); for (var i = 0; i < links.length; i++){ fullHeight += links[i].offsetHeight; } var moveBy = Math.round(this.speed * links.length); var mainInstance = this; var intId = setInterval(function() { var curHeight = submenu.offsetHeight; var newHeight = curHeight + moveBy; if (newHeight <fullHeight){ submenu.style.height = newHeight + "px"; }else { clearInterval(intId); submenu.style.height = ""; submenu.className = "open"; } }, this.time); this.collapseOthers(submenu); } FOLDMenu.prototype.closeMenu=function(submenu){ var minHeight=submenu.getElementsByTagName("span")[0].offsetHeight; var moveBy = Math.round(this.speed * submenu.getElementsByTagName("a").length); var mainInstance = this; var intId = setInterval(function() { var curHeight = submenu.offsetHeight; var newHeight = curHeight - moveBy; if (newHeight > minHeight){ submenu.style.height = newHeight + "px"; }else { clearInterval(intId); submenu.style.height = ""; submenu.className = ""; } }, this.time); } FOLDMenu.prototype.collapseOthers = function(submenu){ if(this.onlyone){ for (var i = 0; i < this.submenu.length; i++){ if (this.submenu[i] != submenu){ this.closeMenu(this.submenu[i]); } } } }</script><style type="text/css">*{margin:0;padding:0;}.foldmenu{border:1px solid #000;width:150px;margin:50px;}.foldmenu ul{list-style-type:none;height:25px;line-height:25px;overflow:hidden;cursor:pointer;}.foldmenu ul.open{height:auto;}.foldmenu ul span{display:block;padding-left:5px}.foldmenu ul li{border-bottom:1px solid #DDDDDD;}.foldmenu li a{background-color:#EEEEEE;color:#006666;display:block;padding:5px 10px;text-decoration:none;text-align:center;}.foldmenu li a:hover{background-color:#006666;color:#ffffff;}.foldmenu li a.current{background-color:#006666;color:#ffffff;}</style></head><body><div id="foldmenu" class="foldmenu" style="float:left;"> <ul class="open"> <span>编程天地</span> <li><a href="#">电子书籍</a></li> <li><a href="#">源码乐园</a></li> </ul> <ul> <span>中国门户</span> <li><a href="#">百度搜索</a></li> <li><a href="#">新浪新闻</a></li> <li><a href="#">腾讯QQ</a></li> </ul> <ul> <span>音乐网站</span> <li><a href="#">百度音乐</a></li> <li><a href="#">QQ163</a></li> </ul></div><div id="foldmenu2" class="foldmenu" style="float:right;"> <ul class="open"> <span>世界大学</span> <li><a href="#">剑桥</a></li> <li><a href="#">牛津</a></li> <li><a href="#">哈佛</a></li> <li><a href="#">麻省理工</a></li> </ul> <ul> <span>中国大学</span> <li><a href="#">北大</a></li> <li><a href="#">清华</a></li> <li><a href="#">港大</a></li> </ul> <ul> <span>世界好车</span> <li><a href="#">宝马</a></li> <li><a href="#">奔驰</a></li> <li><a href="#">奥迪</a></li> </ul> <ul> <span>开源论坛</span> <li><a href="#">PhpWind</a></li> <li><a href="#">Discuz!</a></li> </ul></div><script type="text/javascript">window.onload = function() { myMenu = new FOLDMenu("foldmenu",true); myMenu.init(); myMenu2 = new FOLDMenu("foldmenu2"); myMenu2.init();};</script></body></html>希望本文所述对大家的JavaScript程序设计有所帮助。
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