Whether the piston is in the process of expanding or
retracting.
抛出
This property can throw when used.
此属性在使用时可能会抛出异常。
只读实验性isValid
isValid:boolean
备注
返回组件是否有效。若组件的拥有者有效,并且组件需要的任何
额外验证也通过,则该组件被认为是有效的。
Returns whether the component is valid. A component is
considered valid if its owner is valid, in addition to any
addition to any additional validation required by the
component.
当存在时,此方块具有类似活塞的行为。表示 发现方块活塞状态的附加属性。
When present, this block has piston-like behavior. Contains additional properties for discovering block piston state.