自学Xpath的几个例子

　　Xpath可以对XML文件中的信息进行查找，并对XML文件树形结构进行遍历。详细语法请转：http://www.w3school.com.cn/xpath/index.asp

例子：利用在JavaScript脚本中利用Xpath对XML文件中内容进行查询，将查询结果显示到html文件中

ex1.html文件：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>

<head>

    <title>Xpath Basis-1</title>

    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

    <meta name="author" content="Wayne Ng" />

    <meta name="description" content="Xpath basis1" />

    <meta name="revised" content="Wayne Ng, 2016/1/26" />

</head>

<body onload = "startLoad()">

    <p>所有英雄职业:</p>

    <div id = "text"></div>

    <script type="text/javascript" src="func1.js"></script>

</body>

</html>

ex1.xml文件：

<?xml version = "1.0" encoding = "UTF-8"?>

<!--

    Date:2016/1/26

    Writer:Wayne Ng

    Theme:MapleStory hero briefInstruction

-->

<game>

    <warrior>

        <hero>

            <name>英雄</name>

            <weapons>剑、斧、钝器</weapons>

            <skill>终极打击</skill>

        </hero>

        <hero>

            <name>圣骑士</name>

            <weapons>剑、钝器</weapons>

            <skill>神圣冲击</skill>

        </hero>

        <hero>

            <name>黑骑士</name>

            <weapons>长枪、矛</weapons>

            <skill>黑暗穿刺</skill>

        </hero>

    </warrior>

    <magician>

        <hero>

            <name>主教</name>

            <weapons>长杖、短仗</weapons>

            <skill>圣光普照</skill>

        </hero>

        <hero>

            <name>火毒法师</name>

            <weapons>长杖、短仗</weapons>

            <skill>末日火焰</skill>

        </hero>

        <hero>

            <name>冰雷法师</name>

            <weapons>长杖、短仗</weapons>

            <skill>冰咆哮</skill>

        </hero>

    </magician>

    <archer>

        <hero>

            <name>神射手</name>

            <weapons>弓</weapons>

            <skill>暴风箭雨</skill>

        </hero>

        <hero>

            <name>箭神</name>

            <weapons>弩</weapons>

            <skill>终极扫射</skill>

        </hero>

    </archer>

    <ranger>

        <hero>

            <name>侠盗</name>

            <weapons>短剑、短刀</weapons>

            <skill>暗杀</skill>

        </hero>

        <hero>

            <name>隐士</name>

            <weapons>拳套</weapons>

            <skill>四连镖</skill>

        </hero>

        <hero>

            <name>暗影双刀</name>

            <weapons>短剑、短刀</weapons>

            <skill>终极斩</skill>

        </hero>

    </ranger>

</game>

func1.js文件：

//载入待解析XML文件

function loadXMLDoc(name){

    if(window.XMLHttpRequest){

        var xhttp = new XMLHttpRequest();

    }

    else{

        var xhttp = new ActiveXObject("Microsoft.XMLHTTP");

    }

    xhttp.open("GET", name , false);

    xhttp.send(null);

    return xhttp.responseXML;

}

function startLoad(){

    var xml = loadXMLDoc("ex1.xml");

    var path = "//name";

    var txt = "";

    //利用Xpath来查找感兴趣消息

    if(window.ActiveXObject){

        var nodes = xml.selectNodes(path);

        for(var i = 0; i < nodes.length; ++i){

            txt += nodes[i].childNodes[0].nodeValue + "<br />";

        }

    }

    else{

        var nodes = xml.evaluate(path, xml, null, XPathResult.ANY_TYPE, null);

        var result = nodes.iterateNext();

        while(result){

            txt += result.childNodes[0].nodeValue + "<br />";

            result = nodes.iterateNext();

        }

    }

    document.getElementById("text").innerHTML = txt;

}

显示效果：

aaarticlea/png;base64,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" alt="" />

　　　　　　2016/1/26　　By 野马菌

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