復制代碼 代碼如下:

<script language="javascript">
var MAX_INDEX=4;
function change(ddd)
{
if(ddd.style.zIndex<= MAX_INDEX)
{
ddd.style.zIndex = MAX_INDEX+1;
MAX_INDEX++;
}
}
</script>
<div></div>
<div></div>
<div></div>
<div></div>