案例：XML DOM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" src="/example/xdom/loadxmldoc.js">
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</script>
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<script type="text/javascript">
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//check if the first node is an element node
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function get_previousSibling(n)
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{
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y=n.previousSibling;
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while (y.nodeType!=1)
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  {
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  y=y.previousSibling;
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  }
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return y;
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}
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</script>
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</head>
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​
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<body>
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<script type="text/javascript">
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xmlDoc=loadXMLDoc("/example/xdom/books.xml");
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​
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x=get_previousSibling(xmlDoc.getElementsByTagName("price")[0]);
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document.write(x.nodeName);
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</script>
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</body>
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</html>
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​