JavaScript 引用错误无法找到变量加闭包蓝调

发布于 2024-11-18 07:22:48 字数 10191 浏览 3 评论 0原文

总的来说，我在这方面遇到了一些错误。主要是在safari和android浏览器中出现错误

JavaScript引用错误找不到变量

相关变量是 b2AABB。

这是代码 var worldAABB = new b2AABB();
我正在使用 box2d JavaScript（像素实验室变体）来实现 google 关闭。另外，如果您能给我的闭包依赖项并需要一次良好的体验，我将不胜感激。

<html>
<title>Tune Tunnels Alpha</title>
<head>
<!--=============================-->
<!-- Copy this part to your app. -->
<!-- START       -->
<!--=============================-->

<!-- libs -->
<!--[if IE]><script type="text/javascript" src="lib/excanvas.js"></script><![endif]-->
<script src="prototype.js"></script>
<!-- <script src="raphael.js"></script> -->
<script src="closure-library/closure/goog/base.js"></script>

<!-- box2djs -->
<script>
goog.addDependency('../common/b2Settings.js', ['box2d.Settings'], []);
goog.addDependency('../common/math/b2Vec2.js', ['box2d.Vec2'], []);
goog.addDependency('../common/math/b2Mat22.js', ['box2d.Mat22'], []);
goog.addDependency('../collision/b2Proxy.js', ['box2d.Proxy'], []);
goog.addDependency('../collision/ClipVertex.js', ['box2d.ClipVertex'], []);
goog.addDependency('../common/math/b2Math.js', ['box2d.Math'], []);
goog.addDependency('../collision/b2AABB.js', ['box2d.AABB'], []);
goog.addDependency('../collision/b2Bound.js', ['box2d.Bound'], []);
goog.addDependency('../collision/shapes/b2ShapeDef.js', ['box2d.ShapeDef'], []);
goog.addDependency('../collision/b2BoundValues.js', ['box2d.BoundValues'], []);
goog.addDependency('../collision/b2Pair.js', ['box2d.Pair'], []);
goog.addDependency('../collision/b2PairCallback.js', ['box2d.Callback'], []);
goog.addDependency('../collision/b2BufferedPair.js', ['box2d.BufferedPair'], []);
goog.addDependency('../collision/b2PairManager.js', ['box2d.PairManager'], []);
goog.addDependency('../collision/b2BroadPhase.js', ['box2d.BroadPhase'], []);
goog.addDependency('../collision/b2Collision.js', ['box2d.Collision'], []);
goog.addDependency('../collision/Features.js', ['box2d.Features'], []);
goog.addDependency('../collision/b2ContactID.js', ['box2d.ContactID'], []);
goog.addDependency('../collision/b2ContactPoint.js', ['box2d.ContactPoint'], []);
goog.addDependency('../collision/b2Distance.js', ['box2d.Distance'], []);
goog.addDependency('../collision/b2Manifold.js', ['box2d.Manifold'], []);
goog.addDependency('../collision/b2OBB.js', ['box2d.OBB'], []);
goog.addDependency('../collision/shapes/b2Shape.js', ['box2d.Shape'], []);
goog.addDependency('../collision/shapes/b2BoxDef.js', ['box2d.BoxDef'], []);
goog.addDependency('../collision/shapes/b2CircleDef.js', ['box2d.CircleDef'], []);
goog.addDependency('../collision/shapes/b2CircleShape.js', ['box2d.CircleShape'], []);
goog.addDependency('../collision/shapes/b2MassData.js', ['box2d.MassData'], []);
goog.addDependency('../collision/shapes/b2PolyDef.js', ['box2d.PolyDef'], []);
goog.addDependency('../collision/shapes/b2PolyShape.js', ['box2d.PolyShape'], []);
goog.addDependency('../dynamics/b2Body.js', ['box2d.Body'], []);
goog.addDependency('../dynamics/b2BodyDef.js', ['box2d.BodyDef'], []);
goog.addDependency('../dynamics/b2CollisionFilter.js', ['box2d.CollisionFilter'], []);
goog.addDependency('../dynamics/b2Island.js', ['box2d.Island'], []);
goog.addDependency('../dynamics/b2TimeStep.js', ['box2d.TimeStep'], []);
goog.addDependency('../dynamics/contacts/b2ContactNode.js', ['box2d.ContactNode'], []);
goog.addDependency('../dynamics/contacts/b2Contact.js', ['box2d.Contact'], []);
goog.addDependency('../dynamics/contacts/b2ContactConstraint.js', ['box2d.ContactConstraint'], []);
goog.addDependency('../dynamics/contacts/b2ContactConstraintPoint.js', ['box2d.ContactConstraintPoint'], []);
goog.addDependency('../dynamics/contacts/b2ContactRegister.js', ['box2d.ContactRegister'], []);
goog.addDependency('../dynamics/contacts/b2ContactSolver.js', ['box2d.ContactSolver'], []);
goog.addDependency('../dynamics/contacts/b2CircleContact.js', ['box2d.CircleContact'], []);
goog.addDependency('../dynamics/contacts/b2Conservative.js', ['box2d.Conservative'], []);
goog.addDependency('../dynamics/contacts/b2NullContact.js', ['box2d.NullContact'], []);
goog.addDependency('../dynamics/contacts/b2PolyAndCircleContact.js', ['box2d.PolyAndCircleContact'], []);
goog.addDependency('../dynamics/contacts/b2PolyContact.js', ['box2d.PolyContact'], []);
goog.addDependency('../dynamics/b2ContactManager.js', ['box2d.ContactManager'], []);
goog.addDependency('../dynamics/b2World.js', ['box2d.World'], []);
goog.addDependency('../dynamics/b2WorldListener.js', ['box2d.WorldListener'], []);
goog.addDependency('../dynamics/joints/b2JointNode.js', ['box2d.JointNode'], []);
goog.addDependency('../dynamics/joints/b2Joint.js', ['box2d.Joint'], []);
goog.addDependency('../dynamics/joints/b2JointDef.js', ['box2d.JointDef'], []);
goog.addDependency('../dynamics/joints/b2DistanceJoint.js', ['box2d.DistanceJoint'], []);
goog.addDependency('../dynamics/joints/b2DistanceJointDef.js', ['box2d.DistanceJointDef'], []);
goog.addDependency('../dynamics/joints/b2Jacobian.js', ['box2d.Jacobian'], []);
goog.addDependency('../dynamics/joints/b2GearJoint.js', ['box2d.GearJoint'], []);
goog.addDependency('../dynamics/joints/b2GearJointDef.js', ['box2d.GearJointDef'], []);
goog.addDependency('../dynamics/joints/b2MouseJoint.js', ['box2d.MouseJoint'], []);
goog.addDependency('../dynamics/joints/b2MouseJointDef.js', ['box2d.MouseJointDef'], []);
goog.addDependency('../dynamics/joints/b2PrismaticJoint.js', ['box2d.PrismaticJoint'], []);
goog.addDependency('../dynamics/joints/b2PrismaticJointDef.js', ['box2d.PrismaticJointDef'], []);
goog.addDependency('../dynamics/joints/b2PulleyJoint.js', ['box2d.PulleyJoint'], []);
goog.addDependency('../dynamics/joints/b2PulleyJointDef.js', ['box2d.PulleyJointDef'], []);
goog.addDependency('../dynamics/joints/b2RevoluteJoint.js', ['box2d.RevoluteJoint'], []);
goog.addDependency('../dynamics/joints/b2RevoluteJointDef.js', ['box2d.RevoluteJointDef'], []);
goog.require('goog.dom');
goog.require('box2d.Settings');
goog.require('box2d.Vec2');
goog.require('box2d.Mat22');
goog.require('box2d.Proxy');
goog.require('box2d.ClipVertex');
goog.require('box2d.Math');
goog.require('box2d.AABB');
goog.require('box2d.Bound');
goog.require('box2d.ShapeDef');
goog.require('box2d.RevoluteJoint');
goog.require('box2d.World')
goog.require('box2d.BoundValues');
goog.require('box2d.Pair');
goog.require('box2d.Callback');
goog.require('box2d.BufferedPair');
goog.require('box2d.PairManager');
goog.require('box2d.BroadPhase');
goog.require('box2d.Collision');
goog.require('box2d.Features');
goog.require('box2d.ContactID');
goog.require('box2d.ContactPoint');
goog.require('box2d.Distance');
goog.require('box2d.Manifold');
goog.require('box2d.OBB');
goog.require('box2d.Shape');
goog.require('box2d.BoxDef');
goog.require('box2d.CircleDef');
goog.require('box2d.CircleShape');
goog.require('box2d.MassData');
goog.require('box2d.PolyDef');
goog.require('box2d.PolyShape');
goog.require('box2d.Body');
goog.require('box2d.BodyDef');
goog.require('box2d.CollisionFilter')
goog.require('box2d.Island')
goog.require('box2d.TimeStep');
goog.require('box2d.ContactNode');
goog.require('box2d.Contact');
goog.require('box2d.ContactConstraint');
goog.require('box2d.ContactConstraintPoint');
goog.require('box2d.ContactRegister');
goog.require('box2d.ContactSolver');
goog.require('box2d.CircleContact');
goog.require('box2d.Conservative');
goog.require('box2d.NullContact');
goog.require('box2d.PolyAndCircleContact');
goog.require('box2d.PolyContact');
goog.require('box2d.ContactManager');
goog.require('box2d.WorldListener');
goog.require('box2d.JointNode');
goog.require('box2d.Joint');
goog.require('box2d.JointDef');
goog.require('box2d.DistanceJoint');
goog.require('box2d.DistanceJointDef');
goog.require('box2d.Jacobian');
goog.require('box2d.GearJoint');
goog.require('box2d.GearJointDef');
goog.require('box2d.MouseJoint');
goog.require('box2d.MouseJointDef');
goog.require('box2d.PrismaticJoint');
goog.require('box2d.PrismaticJointDef');
goog.require('box2d.PulleyJoint');
goog.require('box2d.PulleyJointDef');
goog.require('box2d.RevoluteJointDef');
</script>
        <!--=============================-->
        <!-- Copy this part to your app. -->
        <!-- END     -->
        <!--=============================-->
<link href="style/box2d.css" rel="stylesheet" type="text/css" />
</head>
<body>
<script>
document.observe("dom:loaded", function() {
    var worldAABB = new b2AABB();
    worldAABB.minVertex.Set(-1000, -1000);
    worldAABB.maxVertex.Set(1000, 1000);
    var gravity = new b2Vec2(0, 300);
    var doSleep = true;
    var world = new b2World(worldAABB, gravity, doSleep); 
    var circleSd = new b2CircleDef();
    circleSd.density = 1.0;
    circleSd.radius = 20;
    circleSd.restitution = 1.0;
    circleSd.friction = 0;
    var circleBd = new b2BodyDef();
    circleBd.AddShape(circleSd);
    circleBd.position.Set(x,y);
    var circleBody = world.CreateBody(circleBd);

    var jointDef = new b2RevoluteJointDef();
    jointDef.anchorPoint.Set(250, 200);
    jointDef.body1 = world.GetGroundBody();
    jointDef.body2 = circleBody;
    world.CreateJoint(jointDef);
    var timeStep = 1.0/60;
    var iteration = 1;
    world.Step(timeStep, iteration);
    var ctx;
    var canvasWidth; 
    var canvasHeight; 
    function step(cnt) { 
        world.Step(1.0/60, 1);
        ctx.clearRect(0, 0, canvasWidth, canvasHeight);
        drawWorld(world, ctx); // see demos/draw_world.js
        setTimeout('step(' + (cnt || 0) + ')', 10);
    }
    Event.observe(window, 'load', function() {
        setupWorld(world); // as you like
        ctx = $('canvas').getContext('2d');
        var canvasElm = $('canvas');
        canvasWidth = parseInt(canvasElm.width);
        canvasHeight = parseInt(canvasElm.height);
        step();
    });
});
</script>
<canvas> </canvas>
</body>
</html>

原文

Just in general I'm getting some errors with this.
The major one is in safari and the android browser get the error

JavaScript reference error can't find variable

The variable in question is b2AABB.

Here is the code var worldAABB = new b2AABB();
I am working with box2d JavaScript (the pixel lab variant) for google closure. Also if you can give my closure dependencies and requires a good once over I would appreciate it.

<html>
<title>Tune Tunnels Alpha</title>
<head>
<!--=============================-->
<!-- Copy this part to your app. -->
<!-- START       -->
<!--=============================-->

<!-- libs -->
<!--[if IE]><script type="text/javascript" src="lib/excanvas.js"></script><![endif]-->
<script src="prototype.js"></script>
<!-- <script src="raphael.js"></script> -->
<script src="closure-library/closure/goog/base.js"></script>

<!-- box2djs -->
<script>
goog.addDependency('../common/b2Settings.js', ['box2d.Settings'], []);
goog.addDependency('../common/math/b2Vec2.js', ['box2d.Vec2'], []);
goog.addDependency('../common/math/b2Mat22.js', ['box2d.Mat22'], []);
goog.addDependency('../collision/b2Proxy.js', ['box2d.Proxy'], []);
goog.addDependency('../collision/ClipVertex.js', ['box2d.ClipVertex'], []);
goog.addDependency('../common/math/b2Math.js', ['box2d.Math'], []);
goog.addDependency('../collision/b2AABB.js', ['box2d.AABB'], []);
goog.addDependency('../collision/b2Bound.js', ['box2d.Bound'], []);
goog.addDependency('../collision/shapes/b2ShapeDef.js', ['box2d.ShapeDef'], []);
goog.addDependency('../collision/b2BoundValues.js', ['box2d.BoundValues'], []);
goog.addDependency('../collision/b2Pair.js', ['box2d.Pair'], []);
goog.addDependency('../collision/b2PairCallback.js', ['box2d.Callback'], []);
goog.addDependency('../collision/b2BufferedPair.js', ['box2d.BufferedPair'], []);
goog.addDependency('../collision/b2PairManager.js', ['box2d.PairManager'], []);
goog.addDependency('../collision/b2BroadPhase.js', ['box2d.BroadPhase'], []);
goog.addDependency('../collision/b2Collision.js', ['box2d.Collision'], []);
goog.addDependency('../collision/Features.js', ['box2d.Features'], []);
goog.addDependency('../collision/b2ContactID.js', ['box2d.ContactID'], []);
goog.addDependency('../collision/b2ContactPoint.js', ['box2d.ContactPoint'], []);
goog.addDependency('../collision/b2Distance.js', ['box2d.Distance'], []);
goog.addDependency('../collision/b2Manifold.js', ['box2d.Manifold'], []);
goog.addDependency('../collision/b2OBB.js', ['box2d.OBB'], []);
goog.addDependency('../collision/shapes/b2Shape.js', ['box2d.Shape'], []);
goog.addDependency('../collision/shapes/b2BoxDef.js', ['box2d.BoxDef'], []);
goog.addDependency('../collision/shapes/b2CircleDef.js', ['box2d.CircleDef'], []);
goog.addDependency('../collision/shapes/b2CircleShape.js', ['box2d.CircleShape'], []);
goog.addDependency('../collision/shapes/b2MassData.js', ['box2d.MassData'], []);
goog.addDependency('../collision/shapes/b2PolyDef.js', ['box2d.PolyDef'], []);
goog.addDependency('../collision/shapes/b2PolyShape.js', ['box2d.PolyShape'], []);
goog.addDependency('../dynamics/b2Body.js', ['box2d.Body'], []);
goog.addDependency('../dynamics/b2BodyDef.js', ['box2d.BodyDef'], []);
goog.addDependency('../dynamics/b2CollisionFilter.js', ['box2d.CollisionFilter'], []);
goog.addDependency('../dynamics/b2Island.js', ['box2d.Island'], []);
goog.addDependency('../dynamics/b2TimeStep.js', ['box2d.TimeStep'], []);
goog.addDependency('../dynamics/contacts/b2ContactNode.js', ['box2d.ContactNode'], []);
goog.addDependency('../dynamics/contacts/b2Contact.js', ['box2d.Contact'], []);
goog.addDependency('../dynamics/contacts/b2ContactConstraint.js', ['box2d.ContactConstraint'], []);
goog.addDependency('../dynamics/contacts/b2ContactConstraintPoint.js', ['box2d.ContactConstraintPoint'], []);
goog.addDependency('../dynamics/contacts/b2ContactRegister.js', ['box2d.ContactRegister'], []);
goog.addDependency('../dynamics/contacts/b2ContactSolver.js', ['box2d.ContactSolver'], []);
goog.addDependency('../dynamics/contacts/b2CircleContact.js', ['box2d.CircleContact'], []);
goog.addDependency('../dynamics/contacts/b2Conservative.js', ['box2d.Conservative'], []);
goog.addDependency('../dynamics/contacts/b2NullContact.js', ['box2d.NullContact'], []);
goog.addDependency('../dynamics/contacts/b2PolyAndCircleContact.js', ['box2d.PolyAndCircleContact'], []);
goog.addDependency('../dynamics/contacts/b2PolyContact.js', ['box2d.PolyContact'], []);
goog.addDependency('../dynamics/b2ContactManager.js', ['box2d.ContactManager'], []);
goog.addDependency('../dynamics/b2World.js', ['box2d.World'], []);
goog.addDependency('../dynamics/b2WorldListener.js', ['box2d.WorldListener'], []);
goog.addDependency('../dynamics/joints/b2JointNode.js', ['box2d.JointNode'], []);
goog.addDependency('../dynamics/joints/b2Joint.js', ['box2d.Joint'], []);
goog.addDependency('../dynamics/joints/b2JointDef.js', ['box2d.JointDef'], []);
goog.addDependency('../dynamics/joints/b2DistanceJoint.js', ['box2d.DistanceJoint'], []);
goog.addDependency('../dynamics/joints/b2DistanceJointDef.js', ['box2d.DistanceJointDef'], []);
goog.addDependency('../dynamics/joints/b2Jacobian.js', ['box2d.Jacobian'], []);
goog.addDependency('../dynamics/joints/b2GearJoint.js', ['box2d.GearJoint'], []);
goog.addDependency('../dynamics/joints/b2GearJointDef.js', ['box2d.GearJointDef'], []);
goog.addDependency('../dynamics/joints/b2MouseJoint.js', ['box2d.MouseJoint'], []);
goog.addDependency('../dynamics/joints/b2MouseJointDef.js', ['box2d.MouseJointDef'], []);
goog.addDependency('../dynamics/joints/b2PrismaticJoint.js', ['box2d.PrismaticJoint'], []);
goog.addDependency('../dynamics/joints/b2PrismaticJointDef.js', ['box2d.PrismaticJointDef'], []);
goog.addDependency('../dynamics/joints/b2PulleyJoint.js', ['box2d.PulleyJoint'], []);
goog.addDependency('../dynamics/joints/b2PulleyJointDef.js', ['box2d.PulleyJointDef'], []);
goog.addDependency('../dynamics/joints/b2RevoluteJoint.js', ['box2d.RevoluteJoint'], []);
goog.addDependency('../dynamics/joints/b2RevoluteJointDef.js', ['box2d.RevoluteJointDef'], []);
goog.require('goog.dom');
goog.require('box2d.Settings');
goog.require('box2d.Vec2');
goog.require('box2d.Mat22');
goog.require('box2d.Proxy');
goog.require('box2d.ClipVertex');
goog.require('box2d.Math');
goog.require('box2d.AABB');
goog.require('box2d.Bound');
goog.require('box2d.ShapeDef');
goog.require('box2d.RevoluteJoint');
goog.require('box2d.World')
goog.require('box2d.BoundValues');
goog.require('box2d.Pair');
goog.require('box2d.Callback');
goog.require('box2d.BufferedPair');
goog.require('box2d.PairManager');
goog.require('box2d.BroadPhase');
goog.require('box2d.Collision');
goog.require('box2d.Features');
goog.require('box2d.ContactID');
goog.require('box2d.ContactPoint');
goog.require('box2d.Distance');
goog.require('box2d.Manifold');
goog.require('box2d.OBB');
goog.require('box2d.Shape');
goog.require('box2d.BoxDef');
goog.require('box2d.CircleDef');
goog.require('box2d.CircleShape');
goog.require('box2d.MassData');
goog.require('box2d.PolyDef');
goog.require('box2d.PolyShape');
goog.require('box2d.Body');
goog.require('box2d.BodyDef');
goog.require('box2d.CollisionFilter')
goog.require('box2d.Island')
goog.require('box2d.TimeStep');
goog.require('box2d.ContactNode');
goog.require('box2d.Contact');
goog.require('box2d.ContactConstraint');
goog.require('box2d.ContactConstraintPoint');
goog.require('box2d.ContactRegister');
goog.require('box2d.ContactSolver');
goog.require('box2d.CircleContact');
goog.require('box2d.Conservative');
goog.require('box2d.NullContact');
goog.require('box2d.PolyAndCircleContact');
goog.require('box2d.PolyContact');
goog.require('box2d.ContactManager');
goog.require('box2d.WorldListener');
goog.require('box2d.JointNode');
goog.require('box2d.Joint');
goog.require('box2d.JointDef');
goog.require('box2d.DistanceJoint');
goog.require('box2d.DistanceJointDef');
goog.require('box2d.Jacobian');
goog.require('box2d.GearJoint');
goog.require('box2d.GearJointDef');
goog.require('box2d.MouseJoint');
goog.require('box2d.MouseJointDef');
goog.require('box2d.PrismaticJoint');
goog.require('box2d.PrismaticJointDef');
goog.require('box2d.PulleyJoint');
goog.require('box2d.PulleyJointDef');
goog.require('box2d.RevoluteJointDef');
</script>
        <!--=============================-->
        <!-- Copy this part to your app. -->
        <!-- END     -->
        <!--=============================-->
<link href="style/box2d.css" rel="stylesheet" type="text/css" />
</head>
<body>
<script>
document.observe("dom:loaded", function() {
    var worldAABB = new b2AABB();
    worldAABB.minVertex.Set(-1000, -1000);
    worldAABB.maxVertex.Set(1000, 1000);
    var gravity = new b2Vec2(0, 300);
    var doSleep = true;
    var world = new b2World(worldAABB, gravity, doSleep); 
    var circleSd = new b2CircleDef();
    circleSd.density = 1.0;
    circleSd.radius = 20;
    circleSd.restitution = 1.0;
    circleSd.friction = 0;
    var circleBd = new b2BodyDef();
    circleBd.AddShape(circleSd);
    circleBd.position.Set(x,y);
    var circleBody = world.CreateBody(circleBd);

    var jointDef = new b2RevoluteJointDef();
    jointDef.anchorPoint.Set(250, 200);
    jointDef.body1 = world.GetGroundBody();
    jointDef.body2 = circleBody;
    world.CreateJoint(jointDef);
    var timeStep = 1.0/60;
    var iteration = 1;
    world.Step(timeStep, iteration);
    var ctx;
    var canvasWidth; 
    var canvasHeight; 
    function step(cnt) { 
        world.Step(1.0/60, 1);
        ctx.clearRect(0, 0, canvasWidth, canvasHeight);
        drawWorld(world, ctx); // see demos/draw_world.js
        setTimeout('step(' + (cnt || 0) + ')', 10);
    }
    Event.observe(window, 'load', function() {
        setupWorld(world); // as you like
        ctx = $('canvas').getContext('2d');
        var canvasElm = $('canvas');
        canvasWidth = parseInt(canvasElm.width);
        canvasHeight = parseInt(canvasElm.height);
        step();
    });
});
</script>
<canvas> </canvas>
</body>
</html>

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迷路的信 2024-11-25 07:22:48

我不知道你的闭包/原型环境，但由于看起来你的 JS 文件可能正在异步加载，是否有可能在 dom:loaded 事件触发之前尚未加载所有 JS 文件：

document.observe("dom:loaded", function() {
    var worldAABB = new b2AABB();

错误发生在这个函数的第一行非常可疑。当 JS 文件全部加载时是否会触发一个事件？

因此，我认为您需要弄清楚这是否是脚本加载的计时问题，或者是否是依赖性问题并且永远不会加载所需的脚本。您可以通过将整个 document.observe("dom:loaded", function() { 临时替换为一个新函数来实现这一点，该函数仅在长时间超时后测试 b2AABB 是否存在：

document.observe("dom:loaded", function() {
  setTimeout(function() {
    if (b2AABB) {
      alert("Found it");
    } else {
      alert("Still not there");
    }
  }, 60 * 1000);  // wait 60 seconds
}

如果它仍然存在60 秒后不存在，那么它可能永远不可用，并且您可能存在依赖性问题。如果 60 秒后不存在，那么您可能存在计时问题。

I don't know your closure/prototype environment, but since it looks like your JS files might be loading asynchronously, is it possible that all your JS files aren't loaded yet before the dom:loaded event fires:

document.observe("dom:loaded", function() {
    var worldAABB = new b2AABB();

The error is occurring on the first line of this function which is pretty suspicious. Is there an event that fires when the JS files are all loaded?

So, I think you need to figure out whether this is a timing issue of script loading or whether it's a dependency problem and the desired scripts are never going to be loaded. You can do that by temporarily replacing the entire document.observe("dom:loaded", function() { with a new function that just tests for the existence of b2AABB after a long timeout:

document.observe("dom:loaded", function() {
  setTimeout(function() {
    if (b2AABB) {
      alert("Found it");
    } else {
      alert("Still not there");
    }
  }, 60 * 1000);  // wait 60 seconds
}

If it's still not present after 60 seconds, then it's probably never going to be available and you probably have a dependency issue. If it is there after 60 seconds, then you probably have a timing issue.

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