请教以下 flash as3 代码的意思

package Tclass{ import Tdata.*;import flash.display.*;import flash.events.*;import flash.net.*;import mx.controls.*;public class DataBase { private var Loader : URLLoader ;private var Url : URLRequest ;private var Values : URLVariables ;private var T_type : Type ;private var T_nodeData : NodeData ;private var T_xml : XML ;private var Txt : TextArea ;private var T_User : String ;public function DataBase(m_txt : TextArea , m_user : String , path : String) : void { Txt = m_txt ;T_User = m_user ;T_type = new Type() ;T_nodeData = new NodeData() ;Loader = new URLLoader() ;Url = new URLRequest(path) ;Url.method = URLRequestMethod.POST ;} public function execution() : void { Url.data = Values ;Loader.dataFormat = URLLoaderDataFormat.VARIABLES ;Loader.addEventListener(Event.COMPLETE , Loaded) ;Loader.load(Url) ;} private function Loaded(e : Event) : void { } public function update(m_nodeData : NodeData) : void { var p_node : Object = m_nodeData.getParentNode() ;Values = new URLVariables() ;Values.cmd = "update";Values.user = T_User ;Values.fileName = p_node.res ;Values.sizeMN = p_node.m + ","+ p_node.n ;Values.mark = String(p_node.mark) ;Values.fxLgh = String(p_node.fxLgh) ;Values.movePos = p_node.px + ","+ p_node.py ;Values.frame = String(p_node.frame) ;Values.position = p_node.i + ","+ p_node.j ;Values.isDisplay = String(p_node.isDisplay) ;Values.url = p_node.url ;Values.color = String(p_node.iColor) ;for(var i : int = 0 ;i <m_nodeData.getItemNodes().length ;i++) { var m_node : Object = m_nodeData.getItemNodes()[i] ;Values.fileName += "#"+ m_node.res ;Values.sizeMN += "#"+ m_node.m + ","+ m_node.n ;Values.mark += "#"+ String(m_node.mark) ;Values.fxLgh += "#"+ String(m_node.fxLgh) ;Values.movePos += "#"+ m_node.px + ","+ m_node.py ;Values.frame += "#"+ String(m_node.frame) ;Values.position += "#"+ m_node.i + ","+ m_node.j ;Values.isDisplay += "#"+ String(m_node.isDisplay) ;Values.url += "#"+ m_node.url ;Values.color += "#"+ m_node.iColor ;} /* Txt.text += "Lenght = "+ m_nodeData.getItemNodes().length + "\n";Txt.text += "filename = "+ Values.fileName + "\n";Txt.text += "sizeMN = "+ Values.sizeMN + "\n";Txt.text += "mark = "+ Values.mark + "\n";Txt.text += "fxLgh = "+ Values.fxLgh + "\n";Txt.text += "movePos = "+ Values.movePos + "\n";Txt.text += "frame = "+ Values.frame + "\n";Txt.text += "pos = "+ Values.pos + "\n";Txt.text += "isDisplay = "+ Values. 收起