js melaksanakan kemahiran kesan senarai navigasi pepohon tak terhingga code

Contoh dalam artikel ini menerangkan kod js untuk melaksanakan kesan senarai navigasi pepohon tak terhingga. Kongsikan dengan semua orang untuk rujukan anda. Butirannya adalah seperti berikut:
Ini ialah pelaksanaan js menu lungsur turun pokok tak terhingga Ia mudah dan praktikal. Jika anda rasa ia berguna, anda boleh belajar daripadanya.
Tangkapan skrin kesan berjalan adalah seperti berikut:
Alamat demo dalam talian adalah seperti berikut:
http://demo.jb51.net/js/2015/js-unlimit-tree-style-nav-list-codes/
Kod khusus adalah seperti berikut:
<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',
 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)&#63;tempObj:false;
 },
 firstSibling:function(node){
  var tempObj=node.parentNode.firstChild;
  while(tempObj.nodeType!=1 && tempObj.nextSibling!=null){
   tempObj=tempObj.nextSibling;
  }
  return (tempObj.nodeType==1)&#63;tempObj:false;
 },
 getText:function(node){
  if(!node.hasChildNodes()){return false;}
  var reg=/^\s+$/;
  var tempObj=node.firstChild;
  while(tempObj.nodeType!=3 && tempObj.nextSibling!=null || reg.test(tempObj.nodeValue)){
   tempObj=tempObj.nextSibling;
  }
  return tempObj.nodeType==3&#63;tempObj.nodeValue:false;
 },
 setText:function(node,txt){
  if(!node.hasChildNodes()){return false;}
  var reg=/^\s+$/;
  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&#63;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 &#63; window.event.srcElement : e &#63; 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)&#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(' ');
    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> 
  </li> 
 </ul> 
 </li> 
 <li><a href="#">服务</a> 
 <ul> 
  <li><a href="#">大类别一</a></li> 
  <li><a href="#">大类别二</a></li> 
  <li><a href="#">大类别三</a></li> 
 </ul> 
 </li> 
 <li><a href="#">合作</a></li> 
 <li><a href="#">关于我们</a> 
 <ul> 
  <li><a href="#">大类别一</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> 
   <li><a href="#">小类别一</a></li> 
   <li><a href="#">小类别二</a></li> 
  </ul> 
  </li> 
  <li><a href="#">大类别四</a></li> 
 </ul> 
 </li> 
 <li><a href="#">联系我们</a> 
 <ul> 
  <li><a href="#">大类别一</a></li> 
  <li><a href="#">大类别二</a></li> 
 </ul> 
 </li> 
</ul>
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Saya harap artikel ini akan membantu pengaturcaraan JavaScript semua orang.
js melaksanakan kemahiran kesan senarai navigasi pepohon tak terhingga code_javascript
