JavaScript实现的XML与JSON互转功能详解

<article>
<header id="h1"> 文章标题 </header>
<section id="s1">
<header> 章节标题 </header>
<p> 章节段落 </p>
</section>
</article>

{
"article": {
"header": {
"#text": "文章标题",
"@id": "h1"
},
"section": {
"@id": "s1",
"header": "章节标题",
"p": "章节段落"
}
}
}

//XML形式
<p> <strong>章节</strong>段<em>落</em> </p>

{"p":"<strong>章节</strong>段<em>落</em>"}}

{"p":[{"strong":"章节"},"段",{"em":"落"}]}

<article>
  <section id="s1">第一节</section>
  <header id="h1"> 标题 </header>
  <section id="s2">第二节</section>
</article>

{
  "article": [ {
  "section": {
  "#text": "第一节",
  "@id": "s1"
  },
  }, {
  "header": {
  "#text": "标题",
  "@id": "h1"
  }
  }, {
  "section": {
  "#text": "第一节",
  "@id": "s2"
  }
  }
  ]
}

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<items>
 <item>
  <zip_cd>10036</zip_cd>
  <us_state>NY</us_state>
  <us_city>New York</us_city>
  <us_dist>Broadway</us_dist>
 </item>
</items>

<script type="text/javascript" src="jkl-parsexml.js"></script>
<script><!--
  var url = "zip-e.xml";
  var xml = new JKL.ParseXML( url );
  var data = xml.parse();
  document.write( data["items"]["item"]["us_state"] );
  document.write( data.items.item.us_state );
// --></script>

{
 items: {
  item: {
   zip_cd: "1000001"
   us_state: "NY",
   us_city: "New York",
   us_dist: "Broadway",
  }
 }
};

// 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;
};

<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>

{
 "@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
  }
  }
 }
 ]
}

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;
};