KeyValueChangeRecord

interface

Record representing the item change information.

      
      interface KeyValueChangeRecord<K, V> {
  key: K
  currentValue: V | null
  previousValue: V | null
}

属性

属性	说明
`key: K`	只读 Current key in the Map.
`currentValue: V \| null`	只读 Current value for the key or `null` if removed.
`previousValue: V \| null`	只读 Previous value for the key or `null` if added.