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 changeTabIndex()
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{
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document.getElementById('check3').tabIndex="1"
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document.getElementById('check1').tabIndex="3"
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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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<p>Try navigating the links on this page by
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using your "tab" button on you keyboard</p>
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​
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<form><input type="checkbox" id="check1" tabIndex="1" /><br />
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<input type="checkbox" id="check2" tabIndex="2" /><br />
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<input type="checkbox" id="check3" tabIndex="3" /><br />
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​
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<input type="button" onclick="changeTabIndex()"
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value="Change tabIndex" />
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</form>
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​
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</body>
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</html>
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​