代码编辑器：
x
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<html>3
<body>4
<script>5
if (window.XMLHttpRequest)6
{7
xmlhttp=new XMLHttpRequest();8
}9
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xmlhttp.open("GET","/static/media/books.xml",false);11
xmlhttp.send();12
xmlDoc=xmlhttp.responseXML; 13
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var x=xmlDoc.getElementsByTagName("book")[0];15
document.write("Child nodes before removal: ");16
document.write(x.childNodes.length);17
x.removeChild(x.childNodes[0]);18