flash+as2.0=在构造函数中加载XML文件

如何使用构造函数加载XML,我需要将其解析为数组并使用自定义类 Menu .

这是我的代码:

class Menu {
 // XML file's filename
 private var xmlFile:String = "menu.xml";
 private var menu:XML;
 private var menuArray:Array;
 private var mainmenu:Array;

 function Menu() {
  menu = new XML();
  menu.ignoreWhite = true;
  menu.load(xmlFile);

  menu.onLoad = function(success : Boolean) : Void {
   if (success) {
    // determine how many chambers there are now
    menuArray = menu.firstChild.childNodes;
    var length:Number = menuArray.length;
    trace(length);

    // dynamic according to number of chambers
    for (var i:Number = 0; i < length; i++) {
     var sublength:Number = menuArray[i].childNodes.length;
     var submenu:Array = new Array();

     // chamber name and link
     var xmlNode:XMLNode = menuArray[i];
     submenu["name"] = xmlNode.attributes.name;
     submenu["link"] = xmlNode.attributes.link;

     // create sub-item for each chamber
     for (var j:Number = 0; j < sublength; j++) {
      var subXmlNode:XMLNode = xmlNode.childNodes[j];

      var item:Array = new Array(subXmlNode.firstChild, subXmlNode.attributes.link);
      submenu.push(item);
     }

     // create an entry for each chamber
     mainmenu.push(submenu);
    }
   }
  }
 }

 function buildMenu():Void {
  //trace(mainmenu);
 }
}

但不幸的是,什么都没有加载。