检测和使用两个不同的阵列之间的碰撞检测，以消除它们的实例

您出错，可能是因为您正在运行的3个独立的在同一范围内enter帧处理程序，以及阵列和显示列表（即在多个引用删除项目输入框处理程序）。所以，你小行星从显示列表中删除一个，然后尝试在另一个再次将其删除。

You error, is likely because you are running 3 separate enter frame handlers in the same scope, and removing items from arrays and display lists (that are referenced in multiple enter frame handlers). So you asteroid is removed from the display list in one, and then you try to remove it again in another.

还有一大堆其他问题与你的code，这将导致错误和不想要的结果。像的（VAR我在newLasers） - 在那种循环，我将参考实际的激光对象阵列的不索引。我重新分解你的code和增加了很多code意见为希望给你，你要去错误的想法：

There are also a whole lot of other issues with your code that will cause errors and undesired results. Things like for(var i in newLasers) - in that kind of loop, i will refer to the actual laser object not the index of the array. I've re-factored your code and added lots of code comments to hopefully give you an idea of where you were going wrong:

var spawnTimer:Timer = new Timer(3000); //timer will tick every 3 seconds
var spawnPoints:Array = [0, 100, 200, 300, 400, 500, 550]; //your list of spawn x locations
var spawnAmount:int = 4; //how many asteroids to have on the screen at once (you could increase this over time to make it more difficult)

var asteroidSpeed = 5;
var asteroids:Vector.<asteroidOne> = new Vector.<asteroidOne>(); //the array for your asteroids - changed to vector for possible performance and code hint improvement (basically the same as Array but every object has to be of the specified type)

var lasers:Vector.<shipLaser> = new shipLaser(); //the array of lasers
var maxLasers:int = 4; //the maximum amount lasers allowed at any given time

var soundExplosion:Sound = new ExplosionSound();

stage.addEventListener(KeyboardEvent.KEY_DOWN, onKDown);
player.addEventListener(Event.ENTER_FRAME, gameLoop);
spawnTimer.addEventListener(TimerEvent.TIMER, spawn, false, 0, true); //let's run the spawn function every timer tick
spawnTimer.start(); //start the spawn timer
spawn(); // calling it immediately


function onKDown(e:KeyboardEvent):void{
    if (e.keyCode == 32) {
        //create ONE laser per button push (instead of 4 identical lasers)

        if(lasers.length < maxLasers){ //if player hasn't reached the maximum amount of lasers available
            var tmpLaser:shipLaser = new shipLaser();
            tmpLaser.x = player.x + player.width / 2 - tmpLaser.width / 2;
            tmpLaser.y = player.y;
            addChild(tmpLaser);
            lasers.push(tmpLaser);
        }
    }
}

//calling this will spawn as many new asteroids as are needed to reach the given amount
function spawn(e:Event = null):void {
    if (asteroids.length >= spawnAmount)
        return; //let's not bother running any of the code below if no new asteroids are needed

    spawnPoints.sort(randomizeArray); //lets randomize the spwanPoints
    var spawnIndex:int = 0;

    var a:asteroidOne; //var to hold the asteroid every loop
    while (asteroids.length < spawnAmount)
    {
        a = new asteroidOne();
        a.x = spawnPoints[spawnIndex];
        spawnIndex++; //incriment the spawn index
        if (spawnIndex >= spawnPoints.length)
            spawnIndex = 0; //if the index is out of range of the amount of items in the array, go back to the start

        a.y = -50;
        asteroids.push(a); //add it to the array/vector
        addChild(a); //add it to the display
    }
}

function gameLoop(e:Event):void {
    //LOOP through all the asteroids, give it a label (asteroidLoop) so we can break/continue it inside other loops
    asteroidLoop: for (var i:int = 0; i < asteroids.length; i++) {

        //check if asteroid is out of bounds
        if (asteroids[i].y > stage.stageHeight || asteroids[i].x > stage.stageWidth || asteroids[i].x < -asteroids[i].width || asteroids[i].y < -asteroids[i].height) {
            //object is out of the bounds of the stage, let's remove it

            removeChild(asteroids[i]); //remove it from the display
            asteroids.splice(i, 1); //remove it from the array/vector

            continue; //forget the rest of the code below and move on to the next iteration in the for loop since the asteroid is gone 
        }

        //check if any lasers are colliding with this asteroid
        for (var j:int = lasers.length-1; j >= 0;j--) { //iterate over all lasers backwards
            if (asteroids[i].hitTestObject(lasers[j])){
                trace("BOOM!");
                var soundExplosion:Sound = new ExplosionSound();
                var channel1:SoundChannel = soundExplosion.play();

                //remove the asteroid
                removeChild(asteroids[i]); //remove it from the display
                asteroids.splice(i, 1); //remove it from the array/vector

                //remove the laser
                removeChild(lasers[j]);
                lasers.splice(j, 1);

                continue asteroidLoop; //break completely out of this inner for-loop (lasers) since the asteroid in the outer loop was removed, and move on to the next asteroid
            }
        }

        //check if this asteroid collides with the player
        if (player.hitTestObject(asteroids[i])){
            trace("HIT");

            //remove the asteroid
            removeChild(asteroids[i]); //remove it from the display
            asteroids.splice(i, 1); //remove it from the array/vector

            removeChild(player);

            spawnTimer.stop(); //stop spawning new asteroids

            //will add end-game trigger here soon.

            break; //break completely out of the asteroid loop if it's game over (as there's no point in checking the rest of the asteroids)

        }

        //we've made it this far, so let's just move this asteroid
        asteroids[i].y += asteroidSpeed;
    }


    for (var i:int = lasers.length-1; i >= 0;i--) { //iterate backwards
        lasers[i].y -= laserSpeed;
        // Moves the laser up the screen
        if (lasers[i].y <= 0){ //make this less than or equal to 0
            removeChild(lasers[i]); //remove the laser from the display list
            lasers.splice(i, 1); //remove the laser from the array
        }
    }
}

function randomizeArray(a:*, b:*):int {
    return (Math.random() < .5) ? 1 : -1;
}