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我在JavaScript中苦苦挣扎了一些XML，如何才能仅选择具有某些属性值的标记？如何通过标记属性检索XML标记
下面的示例w3 schools使用此xml file：
<?xml version="1.0" encoding="ISO-8859-1"?>
<bookstore>
<book category="COOKING">
<title lang="en">Everyday Italian</title>
<author>Giada De Laurentiis</author>
<year>2005</year>
<price>30.00</price>
</book>
<book category="CHILDREN">
<title lang="en">Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>
<book category="WEB">
<title lang="en">XQuery Kick Start</title>
<author>James McGovern</author>
<author>Per Bothner</author>
<author>Kurt Cagle</author>
<author>James Linn</author>
<author>Vaidyanathan Nagarajan</author>
<year>2003</year>
<price>49.99</price>
</book>
<book category="WEB">
<title lang="en">Learning XML</title>
<author>Erik T. Ray</author>
<year>2003</year>
<price>39.95</price>
</book>
</bookstore>
然后将下面的脚本获取并在新的一行打印出所有从价格标签的文本。
<html>
<body>
<script type="text/javascript">
function loadXMLDoc(dname){
if (window.XMLHttpRequest){
xhttp=new XMLHttpRequest();
}
else{
xhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xhttp.open("GET",dname,false);
xhttp.send("");
return xhttp.responseXML;
}
//getting the xml into a var to parse
xml=loadXMLDoc("books.xml");
//the path in question
path="/bookstore/book/price/text()" ////how can i change this to only select the prices of the books where the category="COOKING" ?
// code for IE
if (window.ActiveXObject){
var nodes=xml.selectNodes(path);
for (i=0;i<nodes.length;i++)
{
document.write(nodes[i].nodeValue);
document.write("<br />");
}
}
// code for Mozilla, Firefox, Opera, etc.
else if (document.implementation && document.implementation.createDocument){
var nodes=xml.evaluate(path, xml, null, XPathResult.ANY_TYPE,null);
var result=nodes.iterateNext();
while (result)
{
document.write(result.nodeValue + "<br />");
result=nodes.iterateNext();
}
}
</script>
</body>
</html>
是否有可能改变路径，这样脚本将只打印价格标签，其中父标签“书”有“烹饪”的类别属性的文本（我把评论脚本当前路径是我认为我需要改变的地方，但我无法知道如何）？
我真的陷入困境，似乎无法找到如何得到它。任何帮助将很棒:) :)