控制该 Rigidbody2D 的模拟自由度。
默认情况下,该属性设置为 RigidbodyConstraints2D.None - 允许沿所有轴旋转和移动。
在某些情况下,您可能需要限制 Rigidbody2D 只能沿某些轴移动或旋转。可以使用按位 OR 运算符组合多个约束。
另请参阅:RigidbodyConstraints2D。
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