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ul{width:300px;height:300px;overflow:hidden;}
li{width:300px;height:300px;font-size:60px;text-align:center;line-height:300px;}
.ac{background:red;color:#fff;display:}
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varoBtn=document.getElementsByTagName('button');
varoLi=document.getElementsByTagName('li');
for(vari=0;i
oBtn[i].onclick=function(){
for(varj=0;j
oBtn[j].className='';
oLi[j].style.display='none';
}
this.className='ac';
oLi[this.index].style.display='block';
}
oBtn[i].index=i
}
