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 email=document.getElementById('email').tabIndex;
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  var r1=document.getElementById('submit1').tabIndex;
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  document.write("Tab index of email: " + email);
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  document.write("<br />");
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  document.write("Tab index of submit button: " + r1);
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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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Email: <input type="text" id="email" tabindex="1" size="25" value="someone@example.com" />
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<br />
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<input type="submit" id="submit1" tabindex="2" />
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<br /><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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​