JS,无限级,折叠菜单,树形菜单,JS菜单本文实例讲述了JS实现无限级网页折叠菜单(类似树形菜单)效果代码。分享给大家供大家参考。具体如下： 这是一款超不错的网页折叠菜单，采用JavaScript实现。折叠菜单是大家比较常见到的一种菜单形式，可广泛应用于管理系统、后台左侧、产品列表中，本折叠菜单有点树形菜单的味道，相信“无限级”会满足你的要求。 运行效果截图如下： 
在线演示地址如下： http://demo.wanshiok.com/js/2015/js-unlimit-fade-in-out-tree-menu-codes/ 具体代码如下： <html><head><title>无限级折叠菜单JS版</title><style> <!--body,ul,h3 {margin:0px; padding:0px;}li {list-style-type:none;}body{ font-size:12px; color:#333; font-family: Simsun; line-height:15px; }a{text-decoration:none;color:#004285;border:none;}a:hover{text-decoration:none;color:#C33;}#menu { width:260px; margin:50px auto; padding:10px; border:#EEE 1px solid; } #menu h3 { font-size:12px; } #menu ul { background:url("images/ul-bg.gif") repeat-y 5px 0px; overflow:hidden; } #menu ul li { padding:5px 0 2px 15px; background:url("images/tree-ul-li.gif") no-repeat 5px -32px; } #menu ul li ul {display:none;} #menu ul li em { cursor:pointer; display:inline-block; width:15px; float:left; height:15px; margin-left:-14px; background:url("images/tree-ul-li.gif") no-repeat -32px 2px; } #menu ul li em.off { background-position: -17px -18px; } #menu ul li#end { background-color:#FFF; } #menu ul.off { display:block; }--></style></head><body><div id="menu"> <h3>无限级折叠菜单JavaScript版</h3> <ul> <li><em></em><a href='javascript:void(0);'>菜单_1_1</a> <ul> <li><em></em><a href='javascript:void(0);'>菜单_2_1</a> <ul> <li><em></em><a href='javascript:void(0);'>菜单_3_1</a> <ul> <li><em></em><a href='javascript:void(0);'>菜单_4_1</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> <li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> </ul> </li> <li id='end'><em></em><a href='javascript:void(0);'>菜单_3_2</a> <ul> <li><em></em><a href='javascript:void(0);'>菜单_4_1</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> <li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> </ul> </li> </ul> </li> <li id='end'><em></em><a href='javascript:void(0);'>菜单_2_2</a> <ul> <li><em></em><a href='javascript:void(0);'>菜单_3_1</a> <ul> <li><em></em><a href='javascript:void(0);'>菜单_4_1</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> <li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> </ul> </li> <li id='end'><em></em><a href='javascript:void(0);'>菜单_3_2</a> <ul> <li><em></em><a href='javascript:void(0);'>菜单_4_1</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> <li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> </ul> </li> </ul> </li> </ul> </li> <li id='end'><em></em><a href='javascript:void(0);'>菜单_1_2</a> <ul> <li><em></em><a href='javascript:void(0);'>菜单_2_1</a> <ul> <li><em></em><a href='javascript:void(0);'>菜单_3_1</a> <ul> <li><em></em><a href='javascript:void(0);'>菜单_4_1</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> <li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> </ul> </li> <li id='end'><em></em><a href='javascript:void(0);'>菜单_3_2</a> <ul> <li><em></em><a href='javascript:void(0);'>菜单_4_1</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> <li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> </ul> </li> </ul> </li> <li id='end'><em></em><a href='javascript:void(0);'>菜单_2_2</a> <ul> <li><em></em><a href='javascript:void(0);'>菜单_3_1</a> <ul> <li><em></em><a href='javascript:void(0);'>菜单_4_1</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> <li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> </ul> </li> <li id='end'><em></em><a href='javascript:void(0);'>菜单_3_2</a> <ul> <li><em></em><a href='javascript:void(0);'>菜单_4_1</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> <li id='end'><em></em><a href='javascript:void(0);'>菜单_4_2</a> <ul> <li><a href='javascript:void(0);'>菜单_5_1</a></li> <li id='end'><a href='javascript:void(0);'>菜单_5_2</a></li> </ul> </li> </ul> </li> </ul> </li> </ul> </li> </ul></div><script type="text/javascript"> (function(e){ for(var _obj=document.getElementById(e.id).getElementsByTagName(e.tag),i=-1,em;em=_obj[++i];){ em.onclick = function(){ //onmouseover var ul = this.nextSibling; if(!ul){return false;} ul = ul.nextSibling; if(!ul){return false;} if(e.tag != 'a'){ ul = ul.nextSibling; if(!ul){return false;} } //a 标签控制 隐藏或删除该行 for(var _li=this.parentNode.parentNode.childNodes,n=-1,li;li=_li[++n];){ if(li.tagName=="LI"){ for(var _ul=li.childNodes,t=-1,$ul;$ul=_ul[++t];){ switch($ul.tagName){ case "UL": $ul.className = $ul!=ul?"" : ul.className?"":"off"; break; case "EM": $ul.className = $ul!=this?"" : this.className?"":"off"; break; } } } } } }})({id:'menu',tag:'em'});</script></body></html>希望本文所述对大家的JavaScript程序设计有所帮助。
JS,无限级,折叠菜单,树形菜单,JS菜单
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