节点关系

<style>
div{
width:150px;
height:80px;
border:1px solid red;
}
</style>
<div>
 <input type="button" value="点我1" onclick="setcolor(this)"/>
</div>
<div>
 <input type="button" value="点我2" onclick="setcolor(this)"/>
</div>
<script>
function setcolor(o)
{
     //o.parentNode.style.backgroundColor="black";
     //o.parentNode.previousSibling.style.backgroundColor="black";

 o.parentNode.previousSibling.childNodes[0].style.display="none";
}
</script>