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 b1=document.getElementById('b1').tabIndex;
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  var b2=document.getElementById('b2').tabIndex;
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  var b3=document.getElementById('b3').tabIndex;
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  document.write("Tab index of Button 1: " + b1);
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  document.write("<br />");
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  document.write("Tab index of Button 2: " + b2);
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  document.write("<br />");
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  document.write("Tab index of Button 3: " + b3);
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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="button" id="b1" tabIndex="1" value="Button 1" />
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<br />
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<input type="button" id="b2" tabIndex="2" value="Button 2" />
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<br />
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<input type="button" id="b3" tabIndex="3" value="Button 3" />
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<br />
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<input type="button" onclick="showTabIndex()"
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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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​