Whether the piston is in the process of expanding or
retracting.
抛出
This property can throw when used.
只读betaisValid
isValid:boolean
备注
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.
When present, this block has piston-like behavior. Contains additional properties for discovering block piston state.