js 弹出消息层

<style>
.divshow {
 display: block;
 position: absolute;
 width: 20px;
 z-index: 1
}

.divhidden {
 display: none;
 position: absolute;
 width: 20px;
 z-index: 1
}
</style>
<script>

function showdiv(div){
 div.className='divshow';
 div.style.left=event.x+document.body.scrollLeft-div.width+50;
 div.style.top=event.y+document.body.scrollTop+20;
 }
 
</script>

 

<td style="cursor: hand"  onmouseout="javascript:div137.className='divhidden';"onmousemove="javascript:showdiv(div137);">
     bbb
    </td>