分享一款js实现菜单折叠显示效果，这个折叠菜单的兼容性很好，点击前面的折叠按钮来展开和收缩菜单列表。
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<title>兼容性非常好的js折叠菜单特效分享_武鸣人</title>
<style>
body{font-size:12px;text-align:left;font-family:Verdana,宋体,微软雅黑, Arial;background:#fff;color:#000;margin:0;padding:0;}ul,li{list-style:none;margin:0;padding:0;}.ibox{text-align:left;width:140px;padding-bottom:10px;margin:50px 50px 50px 50px;}
.wuming{
position:relative;
font-size:12px;
color:#333333;
background:#f7f7f7;
height:20px;
line-height:20px;
padding-top:3px;
padding-left:18px;
border-top:1px #ffffff solid;
border-bottom:1px #efefef solid;
cursor:pointer;
}
.wuming span {position:absolute;left:0;top:4px;}
.wuming a {
color:#333;
font-size:13px;
}
.wuming_ren li {
line-height:22px;
height:22px;
padding-left:16px;
}
.wuming_ren li a {
display:block;
border-bottom:1px #dedede solid;
}
.wuming_ren li a:hover {
background:#ff9900;
color:#fff;
}
.SubMenuLayer {
display:inline;
cursor:hand;
}
.SubMenuLayerHidden {
display:none;
cursor:hand;
}
</style>
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<body>
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<script type="text/javascript" src="https://www.wuming.ren/ad/tc.js"></script>
<script type="text/javascript" src="https://www.wuming.ren/ad/a.js"></script>
<div class="ibox" style="width:180px;">
<script LANGUAGE="javascript">
var subMenu = new Array(1);
subMenu[0] = 'undefine';
function gotoURL(szURL){
window.open(szURL,'Main','') ;
}
</script>
<table width="100%" height="100%" border="0" cellpadding="0" cellspacing="0">
<tr valign="top">
<td id="Menu" style="display:inline;" width="100%"><script language="javascript">subMenu[0] = 1;</script>
<div id="i1" class="wuming"><span id="ArrowSubLayer1Down" style="display:inline ; "><img onClick="javascript:www_wuming_ren_menu(1)" src="/img/20240411_www_wuming_ren_1.png" border="0"></span><span id="ArrowSubLayer1Right" style="display:none ; "><img onClick="javascript:www_wuming_ren_menu(1)" src="/img/20240411_www_wuming_ren_2.png" border="0"></span><a href="#"><strong>武鸣人一号菜单</strong></a></div>
<div id="wuming_ren_menu1">
<ul class="wuming_ren">
<ul>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人一号列表</a></li>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人二号列表</a></li>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人三号列表</a></li>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人四号列表</a></li>
</ul>
</ul>
</div>
<script language="javascript">subMenu[0] = 2;</script>
<div id="i2" class="wuming"><span id="ArrowSubLayer2Down" style="display:inline ; "><img onClick="javascript:www_wuming_ren_menu(2)" src="/img/20240411_www_wuming_ren_1.png" border="0"></span><span id="ArrowSubLayer2Right" style="display:none ; "><img onClick="javascript:www_wuming_ren_menu(2)" src="/img/20240411_www_wuming_ren_2.png" border="0"></span><a href="#"><strong>武鸣人二号菜单</strong></a></div>
<div id="wuming_ren_menu2">
<ul class="wuming_ren">
<ul>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人一号列表</a></li>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人二号列表</a></li>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人三号列表</a></li>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人四号列表</a></li>
</ul>
</ul>
</div>
<script language="javascript">subMenu[0] = 3;</script>
<div id="i3" class="wuming"><span id="ArrowSubLayer3Down" style="display:inline ; "><img onClick="javascript:www_wuming_ren_menu(3)" src="/img/20240411_www_wuming_ren_1.png" border="0"></span><span id="ArrowSubLayer3Right" style="display:none ; "><img onClick="javascript:www_wuming_ren_menu(3)" src="/img/20240411_www_wuming_ren_2.png" border="0"></span><a href="#"><strong>武鸣人三号菜单</strong></a></div>
<div id="wuming_ren_menu3">
<ul class="wuming_ren">
<ul>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人一号列表</a></li>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人二号列表</a></li>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人三号列表</a></li>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人四号列表</a></li>
</ul>
</ul>
</div>
<script language="javascript">subMenu[0] = 4;</script>
<div id="i4" class="wuming"><span id="ArrowSubLayer4Down" style="display:inline ; "><img onClick="javascript:www_wuming_ren_menu(4)" src="/img/20240411_www_wuming_ren_1.png" border="0"></span><span id="ArrowSubLayer4Right" style="display:none ; "><img onClick="javascript:www_wuming_ren_menu(4)" src="/img/20240411_www_wuming_ren_2.png" border="0"></span><a href="#"><strong>武鸣人四号菜单</strong></a></div>
<div id="wuming_ren_menu4">
<ul class="wuming_ren">
<ul>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人一号列表</a></li>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人二号列表</a></li>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人三号列表</a></li>
<li><a href="https://www.wuming.ren" target="_blank" title="武鸣人">武鸣人四号列表</a></li>
</ul>
</ul>
</div>
<script LANGUAGE="javascript">
var RightMenuUID = "";
function spreadMenu(n){
var szSubMenuClassName = document.getElementById('SubMenu'+n).className ;
document.getElementById('SubMenu'+n).className = 'SubMenuLayerHidden' ;
document.getElementById('ArrowLayer'+n+'Down').style.display = 'none' ;
document.getElementById('ArrowLayer'+n+'Right').style.display = '' ;
if (szSubMenuClassName == 'SubMenuLayerHidden'){
document.getElementById('wuming_ren_menu'+k).className = 'SubMenuLayer' ;
document.getElementById('ArrowSubLayer'+k+'Down').style.display = '' ;
document.getElementById('ArrowSubLayer'+k+'Right').style.display = 'none' ;
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
else{
document.getElementById('wuming_ren_menu'+k).className = 'SubMenuLayerHidden' ;
document.getElementById('ArrowSubLayer'+k+'Down').style.display = 'none' ;
document.getElementById('ArrowSubLayer'+k+'Right').style.display = '' ;
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
if (SubMenu1.scrollHeight > 440 && screen.availHeight <= 600){
SubMenu1.style.height = 440;
SubMenu1.style.overflowY = 'scroll';
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
}
function www_wuming_ren_menu(k){
var szSubMenuClassName = document.getElementById('wuming_ren_menu'+k).className ;
document.getElementById('wuming_ren_menu'+k).className = 'SubMenuLayerHidden' ;
document.getElementById('ArrowSubLayer'+k+'Down').style.display = 'none' ;
document.getElementById('ArrowSubLayer'+k+'Right').style.display = '' ;
if (szSubMenuClassName == 'SubMenuLayerHidden'){
document.getElementById('wuming_ren_menu'+k).className = 'SubMenuLayer' ;
document.getElementById('ArrowSubLayer'+k+'Down').style.display = '' ;
document.getElementById('ArrowSubLayer'+k+'Right').style.display = 'none' ;
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
else{
document.getElementById('wuming_ren_menu'+k).className = 'SubMenuLayerHidden' ;
document.getElementById('ArrowSubLayer'+k+'Down').style.display = 'none' ;
document.getElementById('ArrowSubLayer'+k+'Right').style.display = '' ;
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
if (wuming_ren_menu1.scrollHeight > 440 && screen.availHeight <= 600){
wuming_ren_menu1.style.height = 440;
wuming_ren_menu1.style.overflowY = 'scroll';
}
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
function showall() {
www_wuming_ren_menu(1);
www_wuming_ren_menu(2);
www_wuming_ren_menu(3);
www_wuming_ren_menu(4);
www_wuming_ren_menu(5);
www_wuming_ren_menu(6);
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
</script>
</td>
</tr>
</table>
</div>
</body>
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