​x
 
<html>
<head>
​
<script type="text/javascript">
function bgChange(bg)
{
document.body.style.background=bg
}
</script>
</head>
​
<body>
​
<b>请把鼠标移动到正方形上，背景颜色会发生改变！</b>
​
<table width="300" height="100">
 <tr>
  <td onmouseover="bgChange('red')" 
      onmouseout="bgChange('transparent')"
      bgcolor="red">
  </td>
  <td onmouseover="bgChange('blue')" 
      onmouseout="bgChange('transparent')"
      bgcolor="blue">
  </td>
  <td onmouseover="bgChange('green')" 
      onmouseout="bgChange('transparent')"
      bgcolor="green">
  </td>
</tr>
</table>
​
</body>
</html>
​