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：

　　　　　　2016/1/26　　By 野马菌

posted on 2016-01-26 19:01 野马菌阅读(281) 评论(0) 编辑收藏举报