obj to xml

/**
  * 将一个Object对象转换成XML;
  * @param obj 要转换的Object对象;
  */
 public static function obj2xml(obj : Object) : XML {
  var xml : String = "";
  if(obj instanceof Object) {
   for(var j:String in obj) {
    if (obj[j] instanceof Array) {
     for(var i : Number = 0;i < obj[j]["length"];i++) {
      xml += "<" + j + ">" + obj2xml(obj[j][i]) + "</" + j + ">";
     }
    }else if (obj[j] instanceof Object) {
     xml += "<" + j + ">" + obj2xml(obj[j]) + "</" + j + ">";
    } else {
     xml += "<" + j + ">" + obj[j] + "</" + j + ">";
    }
   }
  } else {
   xml = String(obj);
  }
  return new XML(xml);
 }