JavaScript+CSS无限极分类效果完整实现方法_javascript技巧

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;}

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&#63;b:a;
}
function CNLTreeMenu(id,TagName0) {
 this.id=id;
 this.TagName0=TagName0==""&#63;"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==""&#63;this.AllNodes[i].className=ClassName1:"";
  this.AllNodes[i].innerHTML=(this.AllNodes[i].className==ClassName2&#63;this.ImgBlankB:this.ImgBlankA)+this.AllNodes[i].innerHTML;
  }
 }
 this.SetNodes = function (n) {
 var sClsName=n==0&#63;this.ClassName0:this.ClassName1;
 for (i=0;i<this.AllNodes.length;i++ ) {
  this.AllNodes[i].className==this.ClassName2&#63;"":this.AllNodes[i].className=sClsName;
 }
 }
}

<!--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>
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<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!-->