html使用xpath解析xml

<?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>

<script type="text/javascript">
/*
 @desc 加载XHR文件
 @author lee [<complet@163.com>]
 @param file 文件路径
 @param async 同步或异步 true 异步 flase 同步
 @return xmlDoc 加载后的内容
 */
function loadDoc(file,async=true){
    if(window.XMLHttpRequest){  // code for IE7+, Firefox, Chrome, Opera, Safari
        xmlhttp=new XMLHttpRequest();
    }else{  // code for IE6, IE5
        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
    if(async === true){
        xmlhttp.onreadystatechange = function(){
            if(xmlhttp.readyState < 4){
                // 加载中
            }else if (xmlhttp.readyState == 4 && xmlhttp.status == 200){
                // 成功
                xmlDoc=xmlhttp.responseXML;
                return xmlDoc
            }else{
                // 失败
            }
        }
    }
    xmlhttp.open("GET",file,async);
    xmlhttp.send();
    if(async === false){
        xmlDoc=xmlhttp.responseXML;
        return xmlDoc
    }
}
var xmlDoc = loadDoc('test.xml',false)
var path="/bookstore/book/title"
// code for IE
if (window.ActiveXObject){
var nodes=xmlDoc.selectNodes(path);
    for (i=0;i<nodes.length;i++){
        document.write(nodes[i].childNodes[0].nodeValue);
        document.write("<br />");
    }
}
// code for Mozilla, Firefox, Opera, etc.
else if (document.implementation && document.implementation.createDocument){
    var nodes=xmlDoc.evaluate(path, xmlDoc, null, XPathResult.ANY_TYPE, null);
    var result=nodes.iterateNext();
    while (result){
        document.write(result.childNodes[0].nodeValue);
        document.write("<br />");
        result=nodes.iterateNext();
    }
}
</script>

Harry Potter
Everyday Italian
Learning XML
XQuery Kick Start