                        課程
                    
                        /前端開發
                        
                            /JavaScript
                        
                        /Tab選項卡切換效果

代碼,這樣寫對吧？

<!doctype?html>
<html>
<head>
????<meta?charset="UTF-8">
?<title>Document</title>
?<style?type="text/css">
????*{margin:0;
?????padding:0;
?????font-size:13px;
?????list-style:none;}
.menu{width:210px;
??????margin:50px?auto;
??????border:1px?solid?#ccc;}
.menu?p{height:25px;
????????line-height:25px;
????????font-weight:bold;
????????background:#eee;
????????border-bottom:1px?solid?#ccc;
????????cursor:pointer;
????????padding-left:5px;}
.menu?div?ul{display:none;}
.menu?li{height:24px;
?????????line-height:24px;
?????????padding-left:5px;}
</style>
?<script?type="text/javascript">
?window.onload=function(){
??var?tops=document.getElementsByTagName('p');
　　??var?cons=document.getElementsByTagName('ul');
　　??if(tops.length!=cons.length)
　　??return;
　　
?????//?遍歷所有要點擊的標題且給它們添加索引及綁定事件
????for(var?i=0;i<tops.length;i++){
????????tops[i].id=i;
????????tops[i].onclick=function(){
????????????this.style.display='block';
????????????for(var?j=0;j<cons.length;j++){
????????????????cons[j].style.display='none';
????????????}
????????????cons[this.id].style.display='block';
????????}
????}
?}
?</script>
</head>
<body>
?<div?id="menu">
??<div>
???<p>Web前端</p>
???<ul?style="display:block">
????<li>JavaScript</li>
????<li>DIV+CSS</li>
????<li>jQuery</li>
???</ul>
??</div>
??<div>
???<p>后臺腳本</p>
???<ul>
????<li>PHP</li>
????<li>ASP.net</li>
????<li>JSP</li>
???</ul>
??</div>
??<div>
???<p>前端框架</p>
???<ul>
????<li>Extjs</li>
????<li>Esspress</li>
????<li>YUI</li>
???</ul>
??</div>
?</div>
</body>
</html>