很着急，之前运行的好好的，现在突然不运行的，真是莫名其妙，cocoscreator1.9.2
一个测试场景里就放了一个 AABB的RigidBody（四个PhysicsBoxCollider），其它的都删除了还出错
onLoad: function ()
{
this.pm = cc.director.getPhysicsManager();
this.cm = cc.director.getCollisionManager();
this.T(true);
},
start: function ()
{
},
onEnable: function ()
{
},
T: function (enable)
{
this.pm.enabled = enable;
this.cm.enabled = enable;
},
如上端代码，开启物理引擎放在onLoad就报错，放在start不会模拟
报错如下
TypeError: Cannot read property ‘length’ of undefined
cocos2d-js-for-preview.js:28871
at cc_PhysicsBoxCollider.__init (http://127.0.0.1:7456/app/engine/bin/cocos2d-js-for-preview.js:28871:34)
at CCClass.pushDelayEvent (http://127.0.0.1:7456/app/engine/bin/cocos2d-js-for-preview.js:27827:27)
at cc_PhysicsBoxCollider._init (http://127.0.0.1:7456/app/engine/bin/cocos2d-js-for-preview.js:28853:41)
对应代码段：
__init: function() {
if (this._inited) return;
var body = this.body || this.getComponent(cc.RigidBody);
if (!body) return;
var innerBody = body._getBody();
if (!innerBody) return;
var node = body.node;
var scale = getWorldScale(node);
var shapes = 0 === scale.x && 0 === scale.y ? [] : this._createShape(scale);
shapes instanceof Array || (shapes = [ shapes ]);
var categoryBits = 1 << node.groupIndex;
var maskBits = 0;
var bits = cc.game.collisionMatrix[node.groupIndex];
for (var i = 0; i < bits.length; i++) { // LINE:28871
========= 这里 bits为unddefined，cc.game.collisionMatrix是Array，长度为0，所以出错 ===