案例：javascript案例     状态：可编辑再运行    进入竖版
 运行结果　
​x
 
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<html>
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<body id="myid" class="mystyle">
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​
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<script type="text/javascript">
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x=document.getElementsByTagName('body')[0];
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document.write("Body CSS class: " + x.className);
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document.write("<br />");
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document.write("An alternate way: ");
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document.write(document.getElementById('myid').className);
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</script>
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​
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</body>
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</html>
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​