本文实例讲述了JavaScript实现的经典文件树菜单效果。分享给大家供大家参考。具体如下:
这是一款简单的JavaScript文件树菜单,经典的树形菜单,特别是文件夹的样式比较经典,折叠和展开也很流畅自然,不过本款菜单有一个缺点,就是菜单的数据写在JS的数组里,这样一来多多少少对菜单内容的修改造成一定麻烦。
先来看看运行效果截图:

在线演示地址如下:
http://demo.jb51.net/js/2015/js-file-tree-style-menu-codes/
具体代码如下:
<!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>简单的文件树效果</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:"腾讯网络限公司",s:[ {t:"人力资源",s:[{t:"张A"}]}, {t:"风险控制",s:[{t:"李B"},{t:"赵C"},{t:"吴D"},{t:"司马E"},{t:"潭F"},{t:"袁G"}]}, {t:"系统平台",s:[{t:"资讯组",s:[{t:"王五"}]},{t:"游戏组",s:[{t:"肖十三"}]}]}] }, {t:"拍拍网",s:[{t:"胡一刀"}]}, {t:"盛大网络",s:[{t:"热血传奇",s:[{t:"在线充值"}]},{t:"陈天桥"}]}, {t:"新浪微博",s:[{t:"凤姐"}]}];var et=new Tree(data,"esunTree"); //]]></script></html>希望本文所述对大家的JavaScript程序设计有所帮助。