案例：HTML DOM案例     状态：可编辑再运行    进入竖版
 运行结果　
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<html>
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<head>
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​
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<script type="text/javascript">
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function bgChange(bg)
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{
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document.body.style.background=bg
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}
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</script>
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</head>
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​
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<body>
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​
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<b>请把鼠标移动到正方形上，背景颜色会发生改变！</b>
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​
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<table width="300" height="100">
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 <tr>
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  <td onmouseover="bgChange('red')"
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      onmouseout="bgChange('transparent')"
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      bgcolor="red">
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  </td>
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  <td onmouseover="bgChange('blue')"
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      onmouseout="bgChange('transparent')"
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      bgcolor="blue">
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  </td>
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  <td onmouseover="bgChange('green')"
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      onmouseout="bgChange('transparent')"
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      bgcolor="green">
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  </td>
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</tr>
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</table>
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​
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</body>
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</html>
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​