JS相互轉(zhuǎn)換XML和JSON的方法

<viewport id="menuPane" layout="border">
 <panel region="center" border="0" layout="border">
 <tbar>
 <toolbar text="XXXX">
 <menu>
 <text text="11">
 </text>
 <text text="22">
 </text>
 <text text="33">
 </text>
 </menu>
 </toolbar>
 <toolbar text="XXXX">
 <menu>
 <text text="44">
 </text>
 <text text="55">
 </text>
 <menu>
 <text text="6 6">
 </text>
 </menu>
 <text text="77">
 </text>
 </menu>
 </toolbar>
 </tbar>
 </panel>
</viewport>
var xmlParser = new XmlToJson();
var json = xmlParser.parse(xml);
console.log( JSON.stringify(json) );
var jsonParser = new JsonToXml();
var xml = jsonParser.parse(json);
console.log( xml );

function XmlToJson() {
}
XmlToJson.prototype.setXml = function(xml) {
 if(xml && typeof xml == "string") {
 this.xml = document.createElement("p");
 this.xml.innerHTML = xml;
 this.xml = this.xml.
getElementsByTagName
("*")[0];
 }
 else if(typeof xml == "object"){
 this.xml = xml;
 }
};
XmlToJson.prototype.getXml = function() {
 return this.xml;
};
XmlToJson.prototype.parse = function(xml) {
 this.setXml(xml);
 return this.convert(this.xml);
};
XmlToJson.prototype.convert = function(xml) {
 if (xml.nodeType != 1) {
 return null;
 }
 var obj = {};
 obj.xtype = xml.nodeName.toLowerCase();
 var nodeValue = (xml.textContent || "").replace(/(\r|\n)/g, "").replace(/^\s+|\s+$/g, "");
 
 if(nodeValue && xml.childNodes.length == 1) {
 obj.text = nodeValue;
 }
 if (xml.attributes.length > 0) {
 for (var j = 0; j < xml.attributes.length; j++) {
 var attribute = xml.attributes.item(j);
 obj[attribute.nodeName] = attribute.nodeValue;
 }
 }
 if (xml.childNodes.length > 0) {
 var items = [];
 for(var i = 0; i < xml.childNodes.length; i++) {
 var node = xml.childNodes.item(i);
 var item = this.convert(node);
 if(item) {
 items.push(item);
 }
 }
 if(items.length > 0) {
 obj.items = items;
 }
 }
 return obj;
};

function JsonToXml() {
 this.result = [];
}
JsonToXml.prototype.spacialChars = ["&","<",">","\"","'"];
JsonToXml.prototype.validChars = ["&","<",">",""","'"];
JsonToXml.prototype.toString = function(){
 return this.result.join("");
};
JsonToXml.prototype.replaceSpecialChar = function(s){
 for(var i=0;i<this.spacialChars.length;i++){
 s=s.replace(new RegExp(this.spacialChars[i],"g"),this.validChars[i]);
 }
 return s;
};
JsonToXml.prototype.appendText = function(s){
 s = this.replaceSpecialChar(s);
 this.result.push(s);
};
JsonToXml.prototype.appendAttr = function(key, value){
 this.result.push(" "+ key +"=\""+ value +"\"");
};
JsonToXml.prototype.appendFlagBeginS = function(s){
 this.result.push("<"+s);
};
JsonToXml.prototype.appendFlagBeginE = function(){
 this.result.push(">");
};
JsonToXml.prototype.appendFlagEnd = function(s){
 this.result.push("</"+s+">");
};
JsonToXml.prototype.parse = function(json){
 this.convert(json);
 return this.toString();
};
JsonToXml.prototype.convert = function(obj) {
 var nodeName = obj.xtype || "item";
 this.appendFlagBeginS(nodeName);
 var arrayMap = {};
 for(var key in obj) {
 var item = obj[key];
 if(key == "xtype") {
 continue;
 }
 if(item.constructor == String) {
 this.appendAttr(key, item);
 }
 if(item.constructor == Array) {
 arrayMap[key] = item;
 }
 }
 this.appendFlagBeginE();
 for(var key in arrayMap) {
 var items = arrayMap[key];
 for(var i=0;i<items.length;i++) {
 this.convert(items[i]);
 }
 }
 this.appendFlagEnd(nodeName);
};