# Class: PropertyUpdateEvent
• PropertyUpdateEvent()
属性更新事件
todo Update or Change?
# Properties
# Readonly currentValue
• currentValue: ReadonlyClone‹Long›
Inherited from PropertyUpdateEvent.currentValue
数据改变后的值
Returns: ReadonlyClone‹Long›
# Readonly previousValue
• previousValue: ReadonlyClone‹Long›
Inherited from PropertyUpdateEvent.previousValue
数据改变前的值
Returns: ReadonlyClone‹Long›
# Readonly propertyId
• propertyId: number
(发生变更的)属性 ID
Returns: number
# Readonly type
• type: void
Inherited from PropertyUpdateEvent.type
事件类型，由具体的事件构造时提供
Returns: void