【发布时间】：2018-09-15 20:29:07
【问题描述】：
我正在尝试在 Animate CC 上制作一个简单的游戏。一切似乎都正常，除了当我查看输出时，我收到以下错误：
TypeError：错误 #1009：无法访问 null 的属性或方法 对象引用。 在 _2D_CW2_Game_v10_8_fla::MainTimeline/move() 在_2D_CW2_Game_v10_8_fla::MainTimeline/updateOb()
所以我知道问题可能出在哪里，并且我已经尝试调整代码好几天了，谷歌搜索可能的解决方案，但无济于事......
我的整个源代码如下。任何反馈/建议将不胜感激。
import flash.ui.Keyboard;
import flash.events.KeyboardEvent;
import flash.events.MouseEvent;
import flash.events.Event;
import flash.display.MovieClip;
import flash.net.URLRequest;
import flash.media.Sound;
import flash.media.SoundMixer;
//==================================================
// Variable declaration
//==================================================
// defines the variables for boundaries
var left:Number = 0;
var top:Number = 0;
var right:Number = stage.stageWidth;
var bottom:Number = stage.stageHeight;
var velX:Number = 0;
var velY:Number = 0;
var gravity:Number = 1;
var friction:Number = 0.8;
var bounce:Number = -0.5;
var score:Number = 2;
var cv:Number = 0;
var curCount:Number = 30; // countdown 30s
var rightKeyDown:Boolean = false;
var leftKeyDown:Boolean = false;
var upKeyDown:Boolean = false;
var touchGround:Boolean = false;
// create and place player object on stage
var player:Player = new Player();
player.x = 110;
player.y = 460;
addChild(player);
// create obstacle array
var obstacles:Array = new Array();
var numOb:Number = 3;
// create and place enemies on stage
for (var i:Number = 0; i < numOb; i++) {
var ob:Npc = new Npc();
ob.x = 800;
ob.y = 470;
ob.scaleX = -1;
ob.vx = Math.random() * 20 + 1;
addChild(ob);
obstacles.push(ob);
}
//==================================================
// Event handlers
//==================================================
stage.addEventListener(Event.ENTER_FRAME, EntFrame);
addEventListener(Event.ENTER_FRAME, updateOb);
stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDown);
stage.addEventListener(KeyboardEvent.KEY_UP, keyUp);
//==================================================
// Functions
//==================================================
function keyDown(e:KeyboardEvent):void {
if (e.keyCode == Keyboard.RIGHT) {
rightKeyDown = true;
}
if (e.keyCode == Keyboard.LEFT) {
leftKeyDown = true;
}
if (e.keyCode == Keyboard.UP) {
// if player isn't already jumping and is on the ground
if (!upKeyDown && touchGround) {
// then start jumping
isJumping();
}
upKeyDown = true;
}
}
function keyUp(e:KeyboardEvent):void {
if (e.keyCode == Keyboard.RIGHT) {
rightKeyDown = false;
}
if (e.keyCode == Keyboard.LEFT) {
leftKeyDown = false;
}
if (e.keyCode == Keyboard.UP) {
upKeyDown = false;
}
}
function EntFrame(e:Event):void {
player.x += velX;
player.y += velY;
velX *= friction;
velY += gravity;
if (player.y >= 450) {
touchGround = true;
player.y = 450;
}
// boundary checks
if (player.x + player.width/2 > right) {
player.x = right - player.width/2;
player.velX *= bounce;
} else if (player.x - player.width/2 < left) {
player.x = left + player.width/2;
player.velX *= bounce;
}
// make player move left or right
controls();
if (curCount > 0) {
cv++;
if (cv >= 30) {
curCount--;
cv = 0;
timertext.text = String(curCount);
if (curCount == 0) {
restart();
gotoAndStop("gameOverWon");
}
}
}
}
function updateOb(e:Event):void {
// make obstacles move
for (var i:Number = 0; i < numOb; i++) {
var ob:Npc = obstacles[i];
move(ob);
if (player.hitTestObject(obstacles[i])) {
/*if (obstacles[i].hitTestPoint(player.x + player.width/2, player.y + player.height/2, true)
|| obstacles[i].hitTestPoint(player.x + player.width/2, player.y - player.height/2, true)
|| obstacles[i].hitTestPoint(player.x - player.width/2, player.y + player.height/2, true)
|| obstacles[i].hitTestPoint(player.x - player.width/2, player.y - player.height/2, true))*/
bumpOb(obstacles[i]);
}
}
scoretext.text = String(score);
if (score == 0) {
restart();
gotoAndStop("gameOverLost");
}
}
// applies basic velocity to enemies
function move(moveOb) {
moveOb.x -= moveOb.vx;
if (moveOb.x + moveOb.width/2 > right) {
moveOb.x = right - moveOb.width/2;
moveOb.vx *= bounce;
moveOb.scaleX = -1;
}
if (moveOb.x - moveOb.width/2 < left) {
moveOb.x = left + moveOb.width/2;
moveOb.vx *= bounce;
moveOb.scaleX = 1;
}
}
function bumpOb(p) {
if (p) {
p.removeEventListener(Event.ENTER_FRAME, updateOb);
if (p.parent) {
removeChild(p);
score--;
}
}
}
function restart() {
if(contains(player)) {
removeChild(player);
}
for (var i:int = 0; i < numOb; i++) {
if (contains(obstacles[i]) && obstacles[i] != null) {
removeChild(obstacles[i]);
obstacles[i] = null;
}
}
// returns a new array that consists of a range of elements from the original array,
// without modifying the original array
obstacles.slice(0);
}
function controls() {
if (rightKeyDown) {
velX += 3;
player.scaleX = 1;
}
if (leftKeyDown) {
velX -= 3;
player.scaleX = -1;
}
}
function isJumping() {
touchGround = false;
velY = -15;
}
//==================================================
// Sound control for background music
//==================================================
btnMute.addEventListener(MouseEvent.CLICK, mute);
function mute(e:MouseEvent):void {
SoundMixer.soundTransform = new SoundTransform(0);
btnMute.removeEventListener(MouseEvent.CLICK, mute);
btnMute.addEventListener(MouseEvent.CLICK, unmute);
}
function unmute(e:MouseEvent):void {
SoundMixer.soundTransform = new SoundTransform(1);
btnMute.removeEventListener(MouseEvent.CLICK, unmute);
btnMute.addEventListener(MouseEvent.CLICK, mute);
}
【问题讨论】：
-
欢迎来到 Stackoverflow！作为提示，不要仅仅发布所有代码，而是解释您实际尝试过的内容以及您认为问题所在。期望人们筛选您的整个代码，除了错误消息之外没有任何解释，这是一个很大的时间承诺。
-
最有可能的是，您正在拼接您的数组，但仍有一个 for 循环试图遍历不再存在的项目。如果迭代一个数组，最好使用数组的长度属性，而不是一个固定的数字——所以不要
i < numOb;做i < obstacles.length; -
你确定 obstacels[i] 总是不为空吗？
-
AS3 error #1009的可能重复
-
@BadFeelingAboutThis 表示感谢。我调试了电影，问题似乎出在“move(moveOb)”方法中的
moveOb.x -= moveOb.vx;和“updateOb”中的move(ob);。它告诉我move(ob);是未定义的，但我不知道为什么它是未定义的......我尝试了这里给出的所有建议，但不幸的是它们都没有奏效:(
标签： actionscript-3 actionscript animate-cc