js實作無限級樹狀導航列表效果程式碼_javascript技巧-js教程-PHP中文網

本文實例講述了js實現無限級樹形導航列表效果代碼。分享給大家供大家參考。具體如下：
這是一款js實現無限級樹形下拉導航選單，簡潔實用，用到一個已封裝好的JS類，有用的大家借鏡一下。
運作效果截圖如下：
線上示範網址如下：
http://demo.jb51.net/js/2015/js-unlimit-tree-style-nav-list-codes/
具體程式碼如下：
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css"> 
 *{ margin:0; padding:0; list-style:none;} 
 body { margin:20px;} 
 h2 { font-family:"黑体"; font-size:24px; text-align:center; line-height:32px;} 
 h5 { font-size:12px; text-align:center; font-weight:normal; color:#666; line-height:28px;} 
 #nav a { text-decoration:underline;color:#06c; font-size:14px; line-height:24px;} 
 #nav ul{ margin-bottom:5px;} 
 #nav strong{ color:#696;} 
 #nav.dyn li ul{ display:none;} 
 #nav.dyn li ul.show{ display:block;} 
 #nav.dyn li{ padding-left:15px;} 
 #nav.dyn li.parent{ background:url(images/user_23.gif) 5px 10px no-repeat;} 
 #nav.dyn li.open{ background:url(images/user_23.gif) 5px -34px no-repeat;} 
 </style> 
<script type="text/javascript">
DOMhelp={
 debugWindowId:'DOMhelpdebug',
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  if(!document.getElementById || !document.createTextNode){return;}
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  var reg=/^\s+$/;
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  if(tempObj.nodeType==3){tempObj.nodeValue=txt}else{return false;}
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  tempObj.appendChild(document.createTextNode(txt));
  tempObj.setAttribute('href',to);
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  var tempObj=document.createElement(elm);
  tempObj.appendChild(document.createTextNode(txt));
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  return tempObj.nodeType==1&#63;tempObj:false;
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  DOMhelp.debug=document.createElement('div');
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  document.body.insertBefore(DOMhelp.debug,document.body.firstChild);
 },
 setDebug:function(bug){
  if(!DOMhelp.debug){DOMhelp.initDebug();}
  DOMhelp.debug.innerHTML+=bug+'\n';
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 stopDebug:function(){
  if(DOMhelp.debug){
   DOMhelp.debug.parentNode.removeChild(DOMhelp.debug);
   DOMhelp.debug=null;
  }
 },
 getKey:function(e){
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  var key = window.event.keyCode;
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/* helper methods */
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   e.preventDefault();
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   return r;
  } else {
   elm['on' + evType] = fn;
  }
 },
 cssjs:function(a,o,c1,c2){
  switch (a){
   case 'swap':
    o.className=!DOMhelp.cssjs('check',o,c1)&#63;o.className.replace(c2,c1):o.className.replace(c1,c2);
   break;
   case 'add':
    if(!DOMhelp.cssjs('check',o,c1)){o.className+=o.className&#63;' '+c1:c1;}
   break;
   case 'remove':
    var rep=o.className.match(' '+c1)&#63;' '+c1:c1;
    o.className=o.className.replace(rep,'');
   break;
   case 'check':
    var found=false;
    var temparray=o.className.split(' ');
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     if(temparray[i]==c1){found=true;}
    }
    return found;
   break;
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 },
 safariClickFix:function(){
 return false;
 }
}
DOMhelp.addEvent(window, 'load', DOMhelp.init, false);
</script> 
<script type="text/javascript"> 
<!-- 
sn={ 
 dynamicClass:'dyn', 
 showClass:'show', 
 parentClass:'parent', 
 openClass:'open', 
 navID:'nav', 
 init:function(){ 
 var triggerLink; 
 if(!document.getElementById || !document.createTextNode){return;} 
 var nav=document.getElementById(sn.navID); 
 if(!nav){return;} 
 DOMhelp.cssjs('add',nav,sn.dynamicClass);  
 var nested=nav.getElementsByTagName('ul'); 
 for(var i=0;i<nested.length;i++){ 
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  DOMhelp.cssjs('add',triggerLink.parentNode,sn.parentClass);  
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  triggerLink.onclick=DOMhelp.safariClickFix; 
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  DOMhelp.cssjs('add',firstList,sn.showClass) 
  DOMhelp.cssjs('swap',t.parentNode,sn.openClass,sn.parentClass); 
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 DOMhelp.cancelClick(e); 
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} 
DOMhelp.addEvent(window,'load',sn.init,false); 
--> 
</script> 
<h2>js实现无限级树形导航列表</h2>
<ul id="nav"> 
 <li><a href="#">主页</a></li> 
 <li><a href="#">产品</a> 
 <ul> 
  <li><a href="#">大类别一</a> 
  <ul> 
   <li><a href="#">小类别一</a> 
   <ul> 
    <li><a href="#">次类别一</a></li> 
    <li><a href="#">次类别二</a></li> 
   </ul> 
   </li> 
   <li><a href="#">小类别二</a></li> 
  </ul> 
  </li> 
  <li><a href="#">大类别二</a></li> 
  <li><a href="#">大类别三</a> 
  <ul> 
   <li><a href="#">小类别一</a></li> 
   <li><a href="#">小类别二</a></li> 
  </ul> 
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 </ul> 
 </li> 
 <li><a href="#">服务</a> 
 <ul> 
  <li><a href="#">大类别一</a></li> 
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 </ul> 
 </li> 
 <li><a href="#">合作</a></li> 
 <li><a href="#">关于我们</a> 
 <ul> 
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  <ul> 
   <li><a href="#">小类别一</a></li> 
   <li><a href="#">小类别二</a></li> 
  </ul> 
  </li> 
  <li><a href="#">大类别二</a> 
  <ul> 
   <li><a href="#">小类别一</a></li> 
   <li><a href="#">小类别二</a></li> 
  </ul> 
  </li> 
  <li><a href="#">大类别三</a> 
  <ul> 
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   <li><a href="#">小类别二</a></li> 
  </ul> 
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  <li><a href="#">大类别四</a></li> 
 </ul> 
 </li> 
 <li><a href="#">联系我们</a> 
 <ul> 
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希望本文所述對大家的JavaScript程式設計有所幫助。