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 sun=document.getElementById('sun').tabIndex;
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var mercury=document.getElementById('mercury').tabIndex;
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var venus=document.getElementById('venus').tabIndex;
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​
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document.write("Tab index of Sun: " + sun);
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document.write("<br />");
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document.write("Tab index of Mercury: " + mercury);
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document.write("<br />");
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document.write("Tab index of Venus: " + venus);
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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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<img src ="/img/eg_planets.jpg"
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alt="Planets"
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usemap ="#planetmap" />
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​
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<map name="planetmap">
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<area shape ="rect" coords ="0,0,110,260"
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href ="/example/hdom/sun.html" id="sun" tabIndex="1" />
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<area shape ="circle" coords ="129,161,10"
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href ="/example/hdom/mercur.html" id="mercury" tabIndex="2" />
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<area shape ="circle" coords ="0,0,110,260"
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href ="/example/hdom/venus.html" id="venus" tabIndex="3" />
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</map>
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​
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<input type="button" onclick="showTabIndex()" value="显示 tabIndex" />
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​
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</body>
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</html>
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​