本文實例講述了JavaScript實現的經典文件樹菜單效果。分享給大家供大家參考。具體如下：
這是一款簡單的JavaScript文件樹菜單，經典的樹形菜單，特別是文件夾的樣式比較經典，折疊和展開也很流暢自然，不過本款菜單有一個缺點，就是菜單的數據寫在JS的數組里，這樣一來多多少少對菜單內容的修改造成一定麻煩。
先來看看運行效果截圖：
在線演示地址如下：
http://demo.VeVB.COm/js/2015/js-file-tree-style-menu-codes/
具體代碼如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>簡單的文件樹效果</title><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><style type="text/css">.tree{width:200px;border:2px inset #fff;height:400px;padding:5px;overflow:auto;}.tree dd,.tree dt, .tree dl{margin:0;padding:0;overflow:hidden;}.tree dd{margin-left:18px;}.tree dt{background:url(images/tree-bg.png) no-repeat 0 0px;padding-left:35px;line-height :20px;height:20px;}.tree dt.node-close{background-position: 0 -24px;}.tree dt.node-open{background-position: 0 -58px;}.tree dt a{color:#000;text-decoration:none;font: 12px/1 verdana;line-height :12px;_line-height :16px;}.tree dt a:hover{background:#0A246A;color:#fff;}</style></head><body><div id="esunTree" class="tree"></div></body><script type="text/javascript">try{document.execCommand("BackgroundImageCache",false,true)}catch(e){};function Tree(data, el) { this.app=function(par,tag){return par.appendChild(document.createElement(tag))}; this.create(document.getElementById(el),data)};Tree.fn = Tree.prototype = { create: function (par,group){ var host=this, length = group.length; for (var i = 0; i < length; i++) { var dl =this.app(par,'DL'), dt = this.app(dl,'DT'), dd = this.app(dl,'DD'); dt.innerHTML='<a href="javascript:void(0)">'+group[i]['t']+'</a>'; if (!group[i]['s'])continue; dt.group=group[i]['s']; dt.className+=" node-close"; dt.onclick=function (){ var dd= this.nextSibling; if (!dd.hasChildNodes()){ host.create(dd,this.group); this.className='node-open' }else{ var set=dd.style.display=='none'?['','node-open']:['none','node-close']; dd.style.display=set[0]; this.className=set[1] } } } }};var data=[{ t:'騰訊網絡限公司',s:[ {t:'人力資源',s:[{t:'張A'}]}, {t:'風險控制',s:[{t:'李B'},{t:'趙C'},{t:'吳D'},{t:'司馬E'},{t:'潭F'},{t:'袁G'}]}, {t:'系統平臺',s:[{t:'資訊組',s:[{t:'王五'}]},{t:'游戲組',s:[{t:'肖十三'}]}]} ] }, {t:'拍拍網',s:[{t:'胡一刀'}]}, {t:'盛大網絡',s:[{t:'熱血傳奇',s:[{t:'在線充值'}]},{t:'陳天橋'}]}, {t:'新浪微博',s:[{t:'鳳姐'}]}];var et=new Tree(data,'esunTree'); //]]></script></html>希望本文所述對大家的JavaScript程序設計有所幫助。
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