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 addScrollbars()
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  {
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  document.getElementById("frame1").scrolling="yes";
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  }
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function removeScrollbars()
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  {
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  document.getElementById("frame1").scrolling="no";
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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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<iframe src="/example/hdom/frame_a.html" id="frame1" ></iframe>
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<br />
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<input type="button" onclick="addScrollbars()" value="Add Scrollbars" />
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<input type="button" onclick="removeScrollbars()" value="Remove Scrollbars" />
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</body>
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</html>