class Vehiche{
 private var _nPassengers:Number;
 public var _nMiles:Number;
 public var _nInterval:Number;
 function Vehicle(nPassengers:Number,nMiles:Number) {
  _nPassengers=nPassengers;
  _nMiles=nMiles;
 }
...................}
class Car extends Vehiche{
 private var _sMake:String;
 private var _sMode1:String;
 private var _nYear:Number;
 function Car(sMake:String ,sMode1:String,nYear:Number,class Car extends Vehiche{
 private var _sMake:String;
 private var _sMode1:String;
 private var _nYear:Number;
 function Car(sMake:String ,sMode1:String,nYear:Number,nPassengers:Number,nMiles:Number) {
  super.Vehicle(nPassengers,nMiles);//超类
  //_nPassengers=nPassengers;
  //_nMiles=nMiles;
  _sMake=sMake;
  _sMode1=sMode1;
  year=nYear;
 }Number,nMiles:Number) {
  super(nPassengers,nMiles);
   _sMake=sMake;
  _sMode1=sMode1;
  year=nYear;
 }
...................}