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代码编辑器：
<!DOCTYPE html> <meta charset="utf-8"> <link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> <script src="/static/js/loadxmldoc.js"></script> <script> // 获取元素节点的上一个同级节点 function get_previoussibling(n) { x=n.previousSibling; while (x.nodeType!=1) { x=x.previousSibling; } return x; } xmlDoc=loadXMLDoc("/static/media/dom/books.xml"); x=xmlDoc.getElementsByTagName("author")[0]; document.write(x.nodeName); document.write(" = "); document.write(x.childNodes[0].nodeValue); y=get_previoussibling(x); document.write("<br>Previous sibling: "); document.write(y.nodeName); document.write(" = "); document.write(y.childNodes[0].nodeValue); </script> <footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>
运行结果：