本文实例讲述了javascript+css无限极分类效果完整实现方法。分享给大家供大家参考，具体如下：
CSS样式：
a {text-decoration:none;}
a,a:visited {color:#000;background:inherit;}
body {margin:0;padding:20px;font:12px tahoma,宋体,sans-serif;}
dt {font-size:22px;font-weight:bold;margin:0 0 0 15px;}
dd {margin:0 0 0 15px;}
h4 {margin:0;padding:0;font-size:18px;text-align:center;}
p {margin:0;padding:0 0 0 18px;}
p a,p a:visited {color:#00f;background:inherit;}
/*CNLTreeMenu Start*/
.CNLTreeMenu img.s {cursor:pointer;vertical-align:middle;}
.CNLTreeMenu ul {padding:0;}
.CNLTreeMenu li {list-style:none;padding:0;}
.Closed ul {display:none;}
.Child img.s {background:none;cursor:default;}
#CNLTreeMenu1 ul {margin:0 0 0 17px;}
#CNLTreeMenu1 img.s {width:20px;height:15px;}
#CNLTreeMenu1 .Opened img.s {background:url(skin1/opened.gif) no-repeat 0 0;}
#CNLTreeMenu1 .Closed img.s {background:url(skin1/closed.gif) no-repeat 0 0;}
#CNLTreeMenu1 .Child img.s {background:url(skin1/child.gif) no-repeat 3px 5px;}
#CNLTreeMenu2 ul {margin:0 0 0 17px;}
#CNLTreeMenu2 img.s {width:17px;height:15px;}
#CNLTreeMenu2 .Opened img.s {background:url(skin2/opened.gif) no-repeat 4px 6px;}
#CNLTreeMenu2 .Closed img.s {background:url(skin2/closed.gif) no-repeat 3px 6px;}
#CNLTreeMenu2 .Child img.s {background:url(skin2/child.gif) no-repeat 3px 5px;}
#CNLTreeMenu3 ul {margin:0 0 0 17px;}
#CNLTreeMenu3 img.s {width:34px;height:18px;}
#CNLTreeMenu3 .Opened img.s {background:url(skin3/opened.gif) no-repeat 0 1px;}
#CNLTreeMenu3 .Closed img.s {background:url(skin3/closed.gif) no-repeat 0 1px;}
#CNLTreeMenu3 .Child img.s {background:url(skin3/child.gif) no-repeat 13px 2px;}
/*CNLTreeMenu End*/
/*Temp CSS for View Demo*/
#CNLTreeMenu1,#CNLTreeMenu2,#CNLTreeMenu3 {float:left;width:249px;border:1px solid #99BEEF;background:#D2E4FC;color:inherit;margin:3px;padding:3px;}
#CNLTreeMenu1,#CNLTreeMenu2 {padding-bottom:15px;}
.ViewCode {
clear:both;
border:1px solid #FFB900;background:#FFFFCC;color:inherit;margin:3px;padding:3px;
}
.ViewCode h6 {color:#00f;}
JavaScript代码：
function Ob(o){
var o=document.getElementById(o)?document.getElementById(o):o;
return o;
}
function Hd(o) {
Ob(o).style.display="none";
}
function Sw(o) {
Ob(o).style.display="";
}
function ExCls(o,a,b,n){
var o=Ob(o);
for(i=0;i<n;i++) {o=o.parentNode;}
o.className=o.className==a?b:a;
}
function CNLTreeMenu(id,TagName0) {
this.id=id;
this.TagName0=TagName0==""?"li":TagName0;
this.AllNodes = Ob(this.id).getElementsByTagName(TagName0);
this.InitCss = function (ClassName0,ClassName1,ClassName2,ImgUrl) {
this.ClassName0=ClassName0;
this.ClassName1=ClassName1;
this.ClassName2=ClassName2;
this.ImgUrl=ImgUrl || "css/s.gif";
this.ImgBlankA ="@@##@@";
this.ImgBlankB ="@@##@@";
for (i=0;i<this.AllNodes.length;i++ ) {
this.AllNodes[i].className==""?this.AllNodes[i].className=ClassName1:"";
this.AllNodes[i].innerHTML=(this.AllNodes[i].className==ClassName2?this.ImgBlankB:this.ImgBlankA)+this.AllNodes[i].innerHTML;
}
}
this.SetNodes = function (n) {
var sClsName=n==0?this.ClassName0:this.ClassName1;
for (i=0;i<this.AllNodes.length;i++ ) {
this.AllNodes[i].className==this.ClassName2?"":this.AllNodes[i].className=sClsName;
}
}
}
HTML页面：
<!--CNLTreeMenu Start:-->
<div class="CNLTreeMenu" id="CNLTreeMenu1">
<h4>CNL Tree Menu1</h4>
<p><a id="AllOpen_1" href="#" onclick="MyCNLTreeMenu1.SetNodes(0);Hd(this);Sw('AllClose_1');">全部展开</a><a id="AllClose_1" href="#" onclick="MyCNLTreeMenu1.SetNodes(1);Hd(this);Sw('AllOpen_1');" style="display:none;">全部折叠</a></p><div class="aritcle_card flexRow">
<div class="artcardd flexRow">
<a class="aritcle_card_img" href="/ai/2233" title="AdsGo AI"><img
src="https://img.php.cn/upload/ai_manual/000/000/000/175680269795450.png" alt="AdsGo AI" onerror="this.onerror='';this.src='/static/lhimages/moren/morentu.png'" ></a>
<div class="aritcle_card_info flexColumn">
<a href="/ai/2233" title="AdsGo AI">AdsGo AI</a>
<p>全自动 AI 广告专家，助您在数分钟内完成广告搭建、优化及扩量</p>
</div>
<a href="/ai/2233" title="AdsGo AI" class="aritcle_card_btn flexRow flexcenter"><b></b><span>下载</span> </a>
</div>
</div><p><span>立即学习</span>“<a href="https://pan.quark.cn/s/c1c2c2ed740f" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">Java免费学习笔记（深入）</a></a>”；</p>
<ul>
<li class="Opened"><a href="http://www.jb51.net">JB51.Net</a>
<ul>
<li><a href="#1">技术区</a>
<ul>
<li><a href="#">网页技术</a>
<ul>
<li class="Child"><a href="#">JavaScript</a></li><!--Child Node-->
<li class="Child"><a href="#">HTML/XHTML/CSS</a></li>
<li class="Child"><a href="#">Ajax</a></li>
<li class="Child"><a href="#">网页制作工具</a></li>
<li class="Child"><a href="#">设计/图形</a></li>
<li class="Child"><a href="#">Flash/多媒体</a></li>
<li class="Child"><a href="#">VML/Web3D</a></li>
</ul></li><!--Sub Node 3-->
<li><a href="#">Web编程</a>
<ul>
<li class="Child"><a href="#">Java</a></li><!--Child Node-->
<li class="Child"><a href="#">.Net</a></li>
<li class="Child"><a href="#">ASP/VBScript</a></li>
<li class="Child"><a href="#">PHP</a></li>
<li class="Child"><a href="#">Perl/Python</a></li>
<li class="Child"><a href="#">Web综合/开源</a></li>
</ul></li><!--Sub Node 3-->
<li><a href="#">数据库</a>
<ul>
<li class="Child"><a href="#">Access/SQLServer</a></li><!--Child Node-->
<li class="Child"><a href="#">MySQL/PostgreSQL</a></li>
<li class="Child"><a href="#">Oracle/DB2/Sybase</a></li>
</ul></li><!--Sub Node 3-->
<li><a href="#">服务器</a>
<ul>
<li class="Child"><a href="#">Windows/IIS</a></li><!--Child Node-->
<li class="Child"><a href="#">Unix/Linux/Apache</a></li>
<li class="Child"><a href="#">应用服务器</a></li>
</ul></li><!--Sub Node 3-->
</ul></li><!--Sub Node 2-->
<li><a href="#1">二级目录</a>
<ul>
<li><a href="#">三级目录</a>
<ul>
<li><a href="#">四级目录</a>
<ul>
<li><a href="#">五级目录</a>
<ul>
<li><a href="#"></a>
<ul>
<li><a href="#">第n级目录</a>
<ul>
<li class="Child"><a href="#">叶结点1</a></li><!--Child Node-->
<li class="Child"><a href="#">叶结点2</a></li>
<li class="Child"><a href="#">叶结点3</a></li>
</ul></li><!--Sub Node n -->
</ul></li><!--Sub Node 6 -->
</ul></li><!--Sub Node 5 -->
</ul></li><!--Sub Node 4-->
</ul></li><!--Sub Node 3-->
</ul></li><!--Sub Node 2-->
<li><a href="#1">二级目录</a>
<ul>
<li><a href="#">三级目录</a>
<ul>
<li><a href="#">四级目录</a>
<ul>
<li><a href="#">五级目录</a>
<ul>
<li><a href="#"></a>
<ul>
<li><a href="#">第n级目录</a>
<ul>
<li class="Child"><a href="#">叶结点1</a></li><!--Child Node-->
<li class="Child"><a href="#">叶结点2</a></li>
<li class="Child"><a href="#">叶结点3</a></li>
</ul></li><!--Sub Node n -->
</ul></li><!--Sub Node 6 -->
</ul></li><!--Sub Node 5 -->
</ul></li><!--Sub Node 4-->
</ul></li><!--Sub Node 3-->
</ul></li><!--Sub Node 2-->
</ul></li><!--Sub Node 1 -->
</ul>
</div><!-- CNLTreeMenu -->
<!--CNLTreeMenu1 End!-->
希望本文所述对大家JavaScript程序设计有所帮助。
