JS实现切换标签页效果实例代码

<style type="text/css"> 
<!-- 
BODY { 
PADDING-RIGHT: 0px; PADDING-LEFT: 0px; FONT-SIZE: 12px; PADDING-BOTTOM: 0px; MARGIN: 0px auto; COLOR: black; LINE-HEIGHT: 150%; PADDING-TOP: 10px; BACKGROUND-COLOR: white; TEXT-ALIGN: center 
} 
.dis { 
DISPLAY: block 
} 
.undis { 
DISPLAY: none 
} 
#cntR { 
WIDTH: 302px 
} 
#NewsTop { 
CLEAR: both; MARGIN-BOTTOM: 16px 
} 
#NewsTop P { 
FLOAT: left; LINE-HEIGHT: 21px 
} 
#NewsTop P.topTit { 
FONT-WEIGHT: bold; WIDTH: 117px 
} 
#NewsTop P.topC0 { 
BACKGROUND: #dcdcdc; BORDER-LEFT: #f2f2f2 1px solid; WIDTH: 40px; CURSOR: pointer 
} 
#NewsTop P.topC1 { 
BACKGROUND: #c2130e; BORDER-LEFT: #f2f2f2 1px solid; WIDTH: 40px; COLOR: #fff 
} 
#NewsTop #NewsTop_tit { 
BORDER-BOTTOM: #c2130e 3px solid; HEIGHT: 21px 
} 
#NewsTop #NewsTop_cnt { 
PADDING-LEFT: 32px; BACKGROUND: url(https://www.jb51.net/code/table/tab/o2007320133249.gif) no-repeat 12px 13px; LINE-HEIGHT: 26px; PADDING-TOP: 7px; HEIGHT: 260px; TEXT-ALIGN: left 
} 
#NewsTop #NewsTop_cnt A { 
COLOR: #666; TEXT-DECORATION: none 
} 
#NewsTop #NewsTop_cnt A:hover { 
COLOR: #c2130e; TEXT-DECORATION: underline 
} 
-->
</style>

<DIV id=cntR> 
<DIV id=NewsTop> 
<DIV id=NewsTop_tit> 
<P class=topTit>新闻排行</P> 
<P class=topC0>国内</P> 
<P class=topC0>国际</P> 
<P class=topC0>社会</P> 
<P class=topC0>网评</P> 
</DIV> 
<DIV id=NewsTop_cnt><SPAN title="Don't delete me"></SPAN> 
<SPAN> 
<A href="https://www.jb51.net" target=_self>脚本之家</A><BR> 
<A href="http://play.jb51.net" target=_self>播放器之家</A><BR> 
<A href="http://mingzi.jb51.net" target=_self>个性名字网</A><BR> 
<A href="http://office.jb51.net" target=_self>Office之家</A><BR> 
<A href="http://sc.jb51.net" target=_self>素材之家</A><BR> 
<A href="http://yueduqi.jb51.net" target=_self>阅读器之家</A><BR> 
<div align="right"><A href="https://www.jb51.net" target=_self>...more</A></div> 
</SPAN> 
<SPAN> 
<A href="https://www.jb51.net" target=_self>脚本之家</A><BR> 
<A href="http://play.jb51.net" target=_self>播放器之家</A><BR> 
<A href="http://mingzi.jb51.net" target=_self>个性名字网</A><BR> 
<A href="http://office.jb51.net" target=_self>Office之家</A><BR> 
<A href="http://sc.jb51.net" target=_self>素材之家</A><BR> 
<A href="http://yueduqi.jb51.net" target=_self>阅读器之家</A><BR> 
<div align="right"><A href="https://www.jb51.net" target=_self>...more</A></div> 
</SPAN> 
<SPAN> 
<A href="https://www.jb51.net" target=_self>脚本之家</A><BR> 
<A href="http://play.jb51.net" target=_self>播放器之家</A><BR> 
<A href="http://mingzi.jb51.net" target=_self>个性名字网</A><BR> 
<A href="http://office.jb51.net" target=_self>Office之家</A><BR> 
<A href="http://sc.jb51.net" target=_self>素材之家</A><BR> 
<A href="http://yueduqi.jb51.net" target=_self>阅读器之家</A><BR>
<div align="right"><A href="https://www.jb51.net" target=_self>...more</A></div> 
</SPAN> 
<SPAN> 
<A href="https://www.jb51.net" target=_self>脚本之家</A><BR> 
<A href="http://play.jb51.net" target=_self>播放器之家</A><BR> 
<A href="http://mingzi.jb51.net" target=_self>个性名字网</A><BR> 
<A href="http://office.jb51.net" target=_self>Office之家</A><BR> 
<A href="http://sc.jb51.net" target=_self>素材之家</A><BR> 
<A href="http://yueduqi.jb51.net" target=_self>阅读器之家</A><BR>
<div align="right"><A href="https://www.jb51.net" target=_self>...more</A></div> 
</SPAN> 
</DIV> 
<SCRIPT> 
var Tags=document.getElementById('NewsTop_tit').getElementsByTagName('p'); 
var TagsCnt=document.getElementById('NewsTop_cnt').getElementsByTagName('span'); 
var len=Tags.length; 
var flag=1;//修改默认值 
for(i=1;i<len;i++){ 
Tags[i].value = i; 
Tags[i].onmouseover=function(){changeNav(this.value)}; 
TagsCnt[i].className='undis'; 
} 
Tags[flag].className='topC1'; 
TagsCnt[flag].className='dis'; 
function changeNav(v){ 
Tags[flag].className='topC0'; 
TagsCnt[flag].className='undis'; 
flag=v; 
Tags[v].className='topC1'; 
TagsCnt[v].className='dis'; 
} 
</SCRIPT> 
</DIV> 
</DIV>