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這有點難以解釋，但我會嘗試。Actionscript 3：錯誤＃1009：無法訪問空對象引用的屬性或方法。 （父母）
在我的Main（）類中，假設我創建了主動畫片段（bg_image），並且還創建了一些創建另一個類的實例的行。 （看下面的代碼）
var route = Route(Airport.return_Route);
這條路線的實例，然後意要動態地添加精靈兒童的從主（）類的主要背景。
我試圖將它與以下行： new_flight = new Flight(coordinates) Main.bg_image.addChild(new_flight);
這似乎工作得很好。讓我們將焦點切換到new_flight實例。在Flight類中，這條線trace(this.parent)會返回「[object Image]」，我認爲這是成功的，因爲我的意圖是將new_flight作爲孩子添加到bg_image中，我認爲這是一個「對象圖像」。
但是，嘗試刪除「new_flight」 - 實例時會出現此問題。顯然，這樣做的理想方法是通過帶有removeChild的bg_image。
但是，當我的腳本到達這一行時：Main.bg_image.removeChild(this)，我的腳本停止並返回ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.，在該行。我也嘗試用this.parent.removeChild(this)代替Main.bg_image.removeChild(this)，但沒有運氣。
我認爲解決方案可能是使用某種「EventDispatching」 - 方法。但我還沒有完全理解這個概念呢......
代碼如下。請幫忙。我不知道如何使這項工作...
主類：
package
{
import flash.display.MovieClip;
import flash.utils.Dictionary;
import flash.events.MouseEvent;
import flash.display.Sprite;
import flash.text.TextField;
import fl.controls.Button;
import flash.display.DisplayObject;
import Airport;
public class Main extends Sprite
{
// ------------------------
// Buttons
public var create_new_route;
public var confirm_new_route;
// images
public static var bg_image:MovieClip;
public var airport:MovieClip;
//-------------------------------
public var routeArray:Array;
public static var airportDict:Dictionary = new Dictionary();
public static var collectedAirportArray:Array = new Array();
public function Main()
{
addEventListener(Event.ADDED_TO_STAGE, init);
create_new_route = new Button();
create_new_route.label = "Create new route";
create_new_route.x = 220;
create_new_route.y = 580;
this.addChild(create_new_route)
create_new_route.addEventListener(MouseEvent.CLICK, new_route)
confirm_new_route = new Button();
confirm_new_route.label = "Confirm route";
confirm_new_route.x = 220;
confirm_new_route.y = 610;
this.addChild(confirm_new_route)
confirm_new_route.addEventListener(MouseEvent.CLICK, confirm_route)
}
public function init(e:Event):void
{
removeEventListener(Event.ADDED_TO_STAGE, init);
bg_image = new Image();
addChild(bg_image);
S_USA["x"] = 180.7;
S_USA["y"] = 149.9;
S_USA["bynavn"] = "New York";
S_Norway["x"] = 423.7;
S_Norway["y"] = 76.4;
S_Norway["bynavn"] = "Oslo";
S_South_Africa["x"] = -26;
S_South_Africa["y"] = 146;
S_South_Africa["bynavn"] = "Cape Town";
S_Brazil["x"] = 226;
S_Brazil["y"] = 431.95;
S_Brazil["bynavn"] = "Rio de Janeiro";
S_France["x"] = 459.1;
S_France["y"] = 403.9;
S_France["bynavn"] = "Paris";
S_China["x"] = 716.2;
S_China["y"] = 143.3;
S_China["bynavn"] = "Beijing";
S_Australia["x"] = 809.35;
S_Australia["y"] = 414.95;
S_Australia["bynavn"] = "Sydney";
// ----------------------------------------------------
airportDict["USA"] = S_USA;
airportDict["Norway"] = S_Norway;
airportDict["South Africa"] = S_South_Africa;
airportDict["Brazil"] = S_Brazil;
airportDict["France"] = S_France;
airportDict["China"] = S_China;
airportDict["Australia"] = S_Australia;
for (var k:Object in airportDict)
{
var value = airportDict[k];
var key = k;
startList.addItem({label:key, data:key});
sluttList.addItem({label:key, data:key});
var airport:Airport = new Airport(key,airportDict[key]["bynavn"]);
airport.koordinater(airportDict[key]["x"], airportDict[key]["y"]);
collectedAirportArray.push(airport);
airport.scaleY = minScale;
airport.scaleX = minScale;
bg_image.addChild(airport);
}
// --------------------------------------------
// --------------------------------------------
// -----------------------------------------------
}
private function new_route(evt:MouseEvent):void
{
Airport.ROUTING = true;
}
public function confirm_route(evt:MouseEvent):void
{
Airport.ROUTING = false;
trace(Airport.return_ROUTE);
var route = new Route(Airport.return_ROUTE); // ***
this.addChild(route); // **
Airport.return_ROUTE = new Array();
}
}
}
機場類：
package
{
import flash.display.MovieClip;
import flash.events.MouseEvent;
import flash.events.Event;
import flash.display.SimpleButton;
import flash.display.Stage;
import flash.text.TextField;
import flash.text.TextFormat;
import flashx.textLayout.formats.Float;
public class Airport extends MovieClip
{
public static var ROUTING = false;
public static var return_ROUTE:Array = new Array();
//-----------------------------------------------------------------------------
// ----------------------------------------------------------------------------
protected var navn:String;
protected var bynavn:String;
// ----------------------------------------------------------------------------
public function Airport(navninput, bynavninput)
{
this.bynavn = bynavninput;
this.navn = navninput;
this.addEventListener(MouseEvent.CLICK, clickHandler);
this.addEventListener(MouseEvent.MOUSE_OVER, hoverHandler);
}
public function zoomHandler():void
{
trace("testing complete");
}
public function koordinater(xc, yc)
{
this.x = (xc);
this.y = (yc);
}
private function clickHandler(evt:MouseEvent):void
{
trace(ROUTING)
if (ROUTING == true)
{
return_ROUTE.push([this.x, this.y])
}
}
private function hoverHandler(evt:MouseEvent):void
{
if (ROUTING == true)
{
this.alpha = 60;
this.width = 2*this.width;
this.height = 2*this.height;
this.addEventListener(MouseEvent.MOUSE_OUT, awayHandler);
}
}
private function awayHandler(evt:MouseEvent):void
{
this.width = 13;
this.height = 13;
}
}
}
Route類
package
{
import flash.events.TimerEvent;
import flash.utils.Timer;
import flash.display.MovieClip;
import Main;
public class Route
{
public var income:Number;
public var routePoints:Array;
private var routeTimer:Timer;
private var new_flight:Flight;
public function Route(route_array:Array)
{
this.routePoints = route_array
routeTimer = new Timer(2000);// 2 second
routeTimer.addEventListener(TimerEvent.TIMER, route_function);
routeTimer.start();
}
private function route_function(event:TimerEvent):void
{
for (var counter:uint = 0; counter < routePoints.length - 1; counter ++)
{
trace("Coords: ", routePoints[counter][0],routePoints[counter][1],routePoints[counter + 1][0],routePoints[counter + 1][1]);
new_flight = new Flight(routePoints[counter][0],routePoints[counter][1],routePoints[counter + 1][0],routePoints[counter + 1][1]);
Main.bg_image.addChild(new_flight);
var checkTimer:Timer = new Timer(15);// 1 second
checkTimer.addEventListener(TimerEvent.TIMER, check_function);
checkTimer.start();
function check_function(event:TimerEvent):void
{
if (new_flight.finished = true)
{
checkTimer.stop();
}
}
}
}
}
}
飛行類
package
{
import flash.display.MovieClip;
import flash.display.Sprite;
import flash.events.MouseEvent;
import flash.events.Event;
import flash.display.SimpleButton;
import flash.display.Stage;
import flash.events.TimerEvent;
import flash.utils.Timer;
import fl.controls.Button;
import flash.display.DisplayObject;
public class Flight extends MovieClip
{
public static var speed:uint = 1
public var finished:Boolean = false;
protected var absvector:Number;
protected var vector:Array;
protected var myTimer:Timer;
//protected var parentContainer:MovieClip;
protected var utgangspunkt_x;
protected var utgangspunkt_y;
protected var destinasjon_x;
protected var destinasjon_y;
protected var vector_x;
protected var vector_y;
public function Flight(utgangspunkt_x, utgangspunkt_y, destinasjon_x, destinasjon_y):void
{
addEventListener(Event.ADDED_TO_STAGE, init);
this.utgangspunkt_x = utgangspunkt_x;
this.utgangspunkt_y = utgangspunkt_y;
this.x = utgangspunkt_x;
this.y = utgangspunkt_y;
this.destinasjon_x = destinasjon_x + 10;
this.destinasjon_y = destinasjon_y + 10;
this.vector_x = Math.abs(this.destinasjon_x-this.utgangspunkt_x);
this.vector_y = Math.abs(this.destinasjon_y-this.utgangspunkt_y);
this.height = 20;
this.width = 20;
}
public function init(evt:Event):void
{
trace(this.parent)
if (utgangspunkt_x < destinasjon_x)
{
this.rotation = -(Math.atan((utgangspunkt_y-destinasjon_y)/(destinasjon_x-utgangspunkt_x)))/(Math.PI)*180;
}
else
{
this.rotation = 180-(Math.atan((utgangspunkt_y-destinasjon_y)/(destinasjon_x-utgangspunkt_x)))/(Math.PI)*180;
}
absvector = Math.sqrt(Math.pow((destinasjon_x - utgangspunkt_x),2) + Math.pow((utgangspunkt_y - destinasjon_y),2));
vector = [(destinasjon_x - utgangspunkt_x)/absvector,(utgangspunkt_y - destinasjon_y)/absvector];
stage.addEventListener(Event.ENTER_FRAME, movement)
}
private function movement(evt:Event):void
{
if (this.vector_x > this.vector_y)
{
if (destinasjon_x>utgangspunkt_x)
{
if (this.x < destinasjon_x)
{
this.x += speed*vector[0];
this.y -= speed*vector[1];
}
else
{
finished = true
Main.bg_image.removeChild(this)
}
}
else if (destinasjon_x<utgangspunkt_x)
{
if (this.x > destinasjon_x)
{
this.x += speed*vector[0];
this.y -= speed*vector[1];
}
else
{
finished = true
Main.bg_image.removeChild(this)
}
}
}
else
{
if (destinasjon_y>utgangspunkt_y)
{
if (this.y < destinasjon_y)
{
this.x += speed*vector[0];
this.y -= speed*vector[1];
}
else
{
finished = true
Main.bg_image.removeChild(this)
}
}
else if (destinasjon_y<utgangspunkt_y)
{
if (this.y > destinasjon_y)
{
this.x += speed*vector[0];
this.y -= speed*vector[1];
}
else
{
finished = true
Main.bg_image.removeChild(this)
}
}
}
}
}
}
你正在得到什麼錯誤？ –
直到我嘗試通過它的父級（removeChild）刪除new_flight時，我纔會收到錯誤，它應該是bg_image。我試圖追蹤其父母的價值，並顯示爲「空」。 – user3257755
你確定'new_flight'實例被創建？ –