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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菜單，簡潔實用，用到一個已封裝好的JS類，有用的大家借鑒一下。

運行效果截圖如下：

在線演示地址如下：

http://demo.jb51.net/js/2015/js-unlimit-tree-style-nav-list-codes/

具體代碼如下：

<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:"黑體"; 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',
 init:function(){
  if(!document.getElementById || !document.createTextNode){return;}
 },
 lastSibling:function(node){
  var tempObj=node.parentNode.lastChild;
  while(tempObj.nodeType!=1 && tempObj.previousSibling!=null){
   tempObj=tempObj.previousSibling;
  }
  return (tempObj.nodeType==1)?tempObj:false;
 },
 firstSibling:function(node){
  var tempObj=node.parentNode.firstChild;
  while(tempObj.nodeType!=1 && tempObj.nextSibling!=null){
   tempObj=tempObj.nextSibling;
  }
  return (tempObj.nodeType==1)?tempObj:false;
 },
 getText:function(node){
  if(!node.hasChildNodes()){return false;}
  var reg=/^\s+$/;
  var tempObj=node.firstChild;
  while(tempObj.nodeType!=3 && tempObj.nextSibling!=null || reg.test(tempObj.nodeValue)){
   tempObj=tempObj.nextSibling;
  }
  return tempObj.nodeType==3?tempObj.nodeValue:false;
 },
 setText:function(node,txt){
  if(!node.hasChildNodes()){return false;}
  var reg=/^\s+$/;
  var tempObj=node.firstChild;
  while(tempObj.nodeType!=3 && tempObj.nextSibling!=null || reg.test(tempObj.nodeValue)){
   tempObj=tempObj.nextSibling;
  }
  if(tempObj.nodeType==3){tempObj.nodeValue=txt}else{return false;}
 },
 createLink:function(to,txt){
  var tempObj=document.createElement('a');
  tempObj.appendChild(document.createTextNode(txt));
  tempObj.setAttribute('href',to);
  return tempObj;
 },
 createTextElm:function(elm,txt){
  var tempObj=document.createElement(elm);
  tempObj.appendChild(document.createTextNode(txt));
  return tempObj;
 },
 closestSibling:function(node,direction){
  var tempObj;
  if(direction==-1 && node.previousSibling!=null){
   tempObj=node.previousSibling;
   while(tempObj.nodeType!=1 && tempObj.previousSibling!=null){
     tempObj=tempObj.previousSibling;
   }
  }else if(direction==1 && node.nextSibling!=null){
   tempObj=node.nextSibling;
   while(tempObj.nodeType!=1 && tempObj.nextSibling!=null){
     tempObj=tempObj.nextSibling;
   }
  }
  return tempObj.nodeType==1?tempObj:false;
 },
 initDebug:function(){
  if(DOMhelp.debug){DOMhelp.stopDebug();}
  DOMhelp.debug=document.createElement('div');
  DOMhelp.debug.setAttribute('id',DOMhelp.debugWindowId);
  document.body.insertBefore(DOMhelp.debug,document.body.firstChild);
 },
 setDebug:function(bug){
  if(!DOMhelp.debug){DOMhelp.initDebug();}
  DOMhelp.debug.innerHTML+=bug+'\n';
 },
 stopDebug:function(){
  if(DOMhelp.debug){
   DOMhelp.debug.parentNode.removeChild(DOMhelp.debug);
   DOMhelp.debug=null;
  }
 },
 getKey:function(e){
  if(window.event){
  var key = window.event.keyCode;
  } else if(e){
  var key=e.keyCode;
  }
  return key;
 },
/* helper methods */
 getTarget:function(e){
  var target = window.event ? window.event.srcElement : e ? e.target : null;
  if (!target){return false;}
  while(target.nodeType!=1 && target.nodeName.toLowerCase()!='body'){
   target=target.parentNode;
  }
  return target;
 },
 stopBubble:function(e){
  if(window.event && window.event.cancelBubble){
   window.event.cancelBubble = true;
  } 
  if (e && e.stopPropagation){
   e.stopPropagation();
  }
 },
 stopDefault:function(e){
  if(window.event && window.event.returnValue){
   window.event.returnValue = false;
  } 
  if (e && e.preventDefault){
   e.preventDefault();
  }
 },
 cancelClick:function(e){
  if (window.event){
   window.event.cancelBubble = true;
   window.event.returnValue = false;
  }
  if (e && e.stopPropagation && e.preventDefault){
   e.stopPropagation();
   e.preventDefault();
  }
 },
 addEvent: function(elm, evType, fn, useCapture){
  if (elm.addEventListener){
   elm.addEventListener(evType, fn, useCapture);
   return true;
  } else if (elm.attachEvent) {
   var r = elm.attachEvent('on' + evType, fn);
   return r;
  } else {
   elm['on' + evType] = fn;
  }
 },
 cssjs:function(a,o,c1,c2){
  switch (a){
   case 'swap':
    o.className=!DOMhelp.cssjs('check',o,c1)?o.className.replace(c2,c1):o.className.replace(c1,c2);
   break;
   case 'add':
    if(!DOMhelp.cssjs('check',o,c1)){o.className+=o.className?' '+c1:c1;}
   break;
   case 'remove':
    var rep=o.className.match(' '+c1)?' '+c1:c1;
    o.className=o.className.replace(rep,'');
   break;
   case 'check':
    var found=false;
    var temparray=o.className.split(' ');
    for(var i=0;i<temparray.length;i++){
     if(temparray[i]==c1){found=true;}
    }
    return found;
   break;
  }
 },
 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++){ 
  triggerLink=nested[i].parentNode.getElementsByTagName('a')[0]; 
  DOMhelp.cssjs('add',triggerLink.parentNode,sn.parentClass);  
  DOMhelp.addEvent(triggerLink,'click',sn.changeSection,false); 
  triggerLink.onclick=DOMhelp.safariClickFix; 
  if(nested[i].parentNode.getElementsByTagName('strong').length>0){ 
  DOMhelp.cssjs('add',triggerLink.parentNode,sn.openClass);  
  DOMhelp.cssjs('add',nested[i],sn.showClass); 
  } 
 } 
 }, 
 changeSection:function(e){ 
 var t=DOMhelp.getTarget(e); 
 var firstList=t.parentNode.getElementsByTagName('ul')[0]; 
 if(DOMhelp.cssjs('check',firstList,sn.showClass)){ 
  DOMhelp.cssjs('remove',firstList,sn.showClass) 
  DOMhelp.cssjs('swap',t.parentNode,sn.openClass,sn.parentClass); 
 } else { 
  DOMhelp.cssjs('add',firstList,sn.showClass) 
  DOMhelp.cssjs('swap',t.parentNode,sn.openClass,sn.parentClass); 
 } 
 DOMhelp.cancelClick(e); 
 } 
} 
DOMhelp.addEvent(window,'load',sn.init,false); 
--> 
</script> 
<h2>js實現無限級樹形導航列表</h2>
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希望本文所述對大家的JavaScript程序設計有所幫助。