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检测器，用于检测碰撞
Matter.Detector.canCollide(filterA, filterB)
创建拘束并且返回constraint对象
如果给定的冲突过滤器都计算到碰撞会发生则返回true（待确定）。更多信息请查看body.collisionFilter
Matter.Detector.collisions(broadphasePairs, engine)
从给定的列表里寻找所有的冲突