XML 字符串解析和格式转换

介绍

将 XML 字符串转换成 JavaScript 对象，有哪些方法呢？

• xml2js 库

• 手动转换

xml2js

xml2js 支持 xml 和 js object 的双向转换。

【手动】XML string to XML doc

参考

var parser = new DOMParser();
var xmlDoc = parser.parseFromString(text, "text/xml");

【手动】XML doc to JavaScript object

参考

转换函数

// Changes XML to JSON
function xmlToJSON(xml) {
    
    // Create the return object
    var obj = {};

    if (xml.nodeType == 1) { // element
        // do attributes
        if (xml.attributes.length > 0) {
        obj["@attributes"] = {};
            for (var j = 0; j < xml.attributes.length; j++) {
                var attribute = xml.attributes.item(j);
                obj["@attributes"][attribute.nodeName] = attribute.nodeValue;
            }
        }
    } else if (xml.nodeType == 3) { // text
        obj = xml.nodeValue;
    }

    // do children
    if (xml.hasChildNodes()) {
        for(var i = 0; i < xml.childNodes.length; i++) {
            var item = xml.childNodes.item(i);
            var nodeName = item.nodeName;
            if (typeof(obj[nodeName]) == "undefined") {
                obj[nodeName] = xmlToJson(item);
            } else {
                if (typeof(obj[nodeName].push) == "undefined") {
                    var old = obj[nodeName];
                    obj[nodeName] = [];
                    obj[nodeName].push(old);
                }
                obj[nodeName].push(xmlToJson(item));
            }
        }
    }
    return obj;
};

举例

XML:

<ALEXA VER="0.9" URL="davidwalsh.name/" HOME="0" AID="=">
    <SD TITLE="A" FLAGS="" HOST="davidwalsh.name">
        <TITLE TEXT="David Walsh Blog :: PHP, MySQL, CSS, Javascript, MooTools, and Everything Else"/>
        <LINKSIN NUM="1102"/>
        <SPEED TEXT="1421" PCT="51"/>
    </SD>
    <SD>
        <POPULARITY URL="davidwalsh.name/" TEXT="7131"/>
        <REACH RANK="5952"/>
        <RANK DELTA="-1648"/>
    </SD>
</ALEXA>

JavaScript object:

{
    "@attributes": {
        AID: "=",
        HOME: 0,
        URL: "davidwalsh.name/",
        VER: "0.9",
    },
    SD: [{
        "@attributes": {
            FLAGS: "",
            HOST: "davidwalsh.name",
            TITLE: A
        },
        LINKSIN: {
            "@attributes": {
                NUM: 1102
            }
        },
        SPEED: {
            "@attributes": {
                PCT: 51,
                TEXT: 1421
            }
        },
        TITLE: {
            "@attributes": {
                TEXT: "David Walsh Blog :: PHP, MySQL, CSS, Javascript, MooTools, and Everything Else",
            }
        },
    }, {
        POPULARITY: {
            "@attributes": {
                TEXT: 7131,
                URL: "davidwalsh.name/"
            }
        },
        RANK: {
            "@attributes": {
                DELTA: "-1648"
            }
        },
        REACH: {
            "@attributes": {
                RANK = 5952
            }
        }
    }]
}

JavaScript object to JSON string

var jsonText = JSON.stringify(xmlToJSON(xmlDoc))