案例：XML DOM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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<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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<script type="text/javascript">
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//check if the previous sibling node is an element node
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function get_previoussibling(n)
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{
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var x=n.previousSibling;
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while (x.nodeType!=1)
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  {
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  x=x.previousSibling;
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  }
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return x;
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}
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​
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xmlDoc=loadXMLDoc("/example/xdom/books.xml");
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​
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var x=xmlDoc.getElementsByTagName("author")[0];
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document.write(x.nodeName);
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document.write(" = ");
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document.write(x.childNodes[0].nodeValue);
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​
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var y=get_previoussibling(x);
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​
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document.write("<br />Previous sibling: ");
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document.write(y.nodeName);
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document.write(" = ");
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document.write(y.childNodes[0].nodeValue);
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</script>
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</body>
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</html>
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​