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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</head>
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<body>
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​
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<script type="text/javascript">
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​
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xmlDoc=loadXMLDoc("/example/xdom/books_ns.xml");
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​
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var x=xmlDoc.getElementsByTagName("book")[0];
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​
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document.write(x.lookupPrefix("//www.w3xue.com/children/"));
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​
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</script>
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</body>
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</html>
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​