案例：javascript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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<script type="text/javascript">
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function changeColSpan()
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  {
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  document.getElementById("td1").colSpan="2";
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  }
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</script>
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</head>
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<body>
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​
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<table border="1">
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<tr>
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<th>名</th>
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<th>姓</th>
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</tr>
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<tr>
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<td id="td1">John</td>
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<td id="td2">Adams</td>
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</tr>
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</table>
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<br />
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<input type="button" onclick=changeColSpan() value="改变 colspan" />
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​
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</body>
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</html>
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​