为使此关节断开而需要施加的扭矩。
当关节尝试约束 Rigidbody2D 时，可能需要施加扭矩才能执行此操作。这称为 reactionTorque。每次进行物理更新时，breakTorque 都会与 reactionTorque 进行比较；如果超出，则使用对断开的关节的引用来调用 OnJointBreak2D。如果知道断开的关节，可以使用 reactionTorque 或 GetReactionTorque 检查使关节断开的实际反应扭矩。
断开扭矩可以设置为 Mathf.Infinity，这样无论多大的反应扭矩都不能断开关节。如果从不打算使用扭矩使关节断开，则应使用此值，因为它指示每次进行物理更新时都不应检查关节，因此可提供更好的整体性能。
请注意，breakTorque 在 DistanceJoint2D 或 TargetJoint2D 上不可用。
另请参阅：reactionTorque、GetReactionTorque 和 OnJointBreak2D。
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