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<input class='active' type='button' value='加油'>
<input type='button' value='奋斗'>
<input type='button' value='加油'>
<div id=box>
<div style="display:block">11111111111111111</div>
<div>22222222222222222</div>
<div>33333333333333333</div>
</div>
xxxxxxxxxx
window.onload=function()
{
var anniu=document.getElementsByTagName('input')
var xuan=document.getElementById('box')
var kuang=xuan.getElementsByTagName('div')
for(var i=0;i<anniu.length;i++)
anniu[i].index=i;
anniu[i].onclick=function()
anniu[i].className=''
kuang[i].style.display='none'
}
this.className='active';
kuang[this.index].style.display='block';
#box div{background:#CCC;width:150px; height:150px; display:none;}
.active{background:red;}