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('1').tabIndex="3"
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document.getElementById('2').tabIndex="2"
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document.getElementById('3').tabIndex="1"
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}
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</script>
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</head>
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<body>
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<p><a id="1" href="//www.w3xue.com">1</a></p>
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<p><a id="2" href="//www.w3xue.com">2</a></p>
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<p><a id="3" href="//www.w3xue.com">3</a></p>
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​
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<input type="button" onclick="changeTabIndex()"
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value="Change TabIndex" />
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​
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<p>Try navigating the links by using the "Tab" button on you keyboard before and after pushing the "Change TabIndex" button.</p>
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​
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</body>
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</html>