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 showTabIndex()
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  {
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  var r1=document.getElementById('radio1').tabIndex;
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  var r2=document.getElementById('radio2').tabIndex;
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  var r3=document.getElementById('radio3').tabIndex;
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  document.write("Tab index of radio button 1: " + r1);
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  document.write("<br />");
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  document.write("Tab index of radio button 2: " + r2);
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  document.write("<br />");
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  document.write("Tab index of radio button 3: " + r3);
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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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<form>
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<input type="radio" id="radio1" tabindex="1" /><br />
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<input type="radio" id="radio2" tabindex="2" /><br />
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<input type="radio" id="radio3" tabindex="3" /><br />
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<input type="button" onclick="showTabIndex()" value="Show tabIndex" />
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</form>
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​
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</body>
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</html>
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​