XML2JSON【练习】

网上很多XML2JSON的算法中都习惯用一个“@attributes”把属性统一起来，一开始弄不明白为什么要这样，好像显得很多余，今天自己实现感受了下，明白是因为需要把自身属性的nodeName与子元素的属性区分开来，比如下面测试用例中的Title
在SO我也提问了下，有个大神详细解答了，比我的答案更贴切：

var  xml2json = function (xml) {
if(xml.nodeType === 9){
    xml = xml.children[0]
}
var  obj = {}
if(xml.nodeType === 1){

if(xml.attributes.length > 0){

var attrs = xml.attributes,attrLen = attrs.length

for(var i = 0 ; i < attrLen ; i++){
        var  node = attrs[i]
        obj[node.nodeName]  =  node.nodeValue
    }
}
}
if(xml.children){

var  children = xml.children

var  childLen = children.length

for(var j = 0 ; j < childLen ; j++){

var  curChild = children[j]

if(!obj[curChild.nodeName]){

//console.log(JSON.stringify(xml2json(curChild)))

console.log(curChild)

obj[curChild.nodeName] = xml2json(curChild)

}else {
        if(!Array.isArray(obj[curChild.nodeName])){
            var old =  obj[curChild.nodeName]
            var  handler = obj[curChild.nodeName] = []
            handler.push(old)
        }
        obj[curChild.nodeName].push(xml2json(curChild))
    }
}
}

return obj

}
var  xmlStr = '<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"/>'

+''

+''

+'<POPULARITY URL="davidwalsh.name/" TEXT="7131"/>'

+'<REACH RANK="5952"/>'

+'<RANK DELTA="-1648"/>'

+''

+''

var  domparser = new DOMParser()
var  xmlObj  =domparser.parseFromString(xmlStr,'application/xml')
var  jsonObj  = xml2json(xmlObj)

console.log(jsonObj)

console.log(JSON.stringify(jsonObj))

（编辑：李大同）

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