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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

}