


Classic file tree menu effect implemented in JavaScript_javascript skills
The example in this article describes the classic file tree menu effect implemented in JavaScript. Share it with everyone for your reference. The details are as follows:
This is a simple JavaScript file tree menu. It is a classic tree menu, especially the folder style. The folding and expansion are also smooth and natural. However, this menu has a shortcoming, which is the data writing of the menu. In the JS array, this will cause some trouble in modifying the menu content.
Let’s take a look at the screenshots of the running effect:
The online demo address is as follows:
http://demo.jb51.net/js/2015/js-file-tree-style-menu-codes/
The specific code is as follows:
<!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>
I hope this article will be helpful to everyone’s JavaScript programming.

The differences in performance and efficiency between Python and JavaScript are mainly reflected in: 1) As an interpreted language, Python runs slowly but has high development efficiency and is suitable for rapid prototype development; 2) JavaScript is limited to single thread in the browser, but multi-threading and asynchronous I/O can be used to improve performance in Node.js, and both have advantages in actual projects.

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