本章节分享几个代码片段，它实现了将xml格式内容转换为json格式。

一.JavaScript代码:

// 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].length) == "undefined") {
          var old = obj[nodeName];
          obj[nodeName] = [];
          obj[nodeName].push(old);
        }
        obj[nodeName].push(xmlToJson(item));
      }
    }
  }
  return obj;
};

二.XML代码:

<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" 电脑端t="51"/>
  </sd>
  <sd>
    <popularity url="davidwalsh.name/" text="7131"/>
    <reach rank="5952"/>
    <rank delta="-1648"/>
  </sd>
</alexa>

三.转换json结果:

{
  "@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
        }
      }
    }
  ]
}