控制是否使用连接锚点。
默认情况下，此属性启用，这会导致 Joint2D.connectedBody 和 AnchoredJoint2D.connectedAnchor 属性用于约束 Rigidbody2D（HingeJoint2D 附加到的）的位置。这被称为点到点约束。
当此属性禁用时，点到点约束会被禁用。这会阻止 HingeJoint2D 连接到其锚点，从而允许它所附加的 Rigidbody2D 自由移动。
禁用此选项允许同时使用 电机 和 限制 来约束和修改角运动，而不会约束线性运动。
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