API 参考手册
API > @angular/core

DefaultIterableDiffer

已弃用: v4.0.0 - Should not be part of public API.

class DefaultIterableDiffer<V> implements IterableDiffer, IterableChanges{ constructor(trackByFn?: TrackByFunction<V>) length: number collection: V[] | Iterable<V> | null isDirty: boolean forEachItem(fn: (record: IterableChangeRecord_<V>) => void) forEachOperation(fn: (item: IterableChangeRecord<V>, previousIndex: number, currentIndex: number) => void) forEachPreviousItem(fn: (record: IterableChangeRecord_<V>) => void) forEachAddedItem(fn: (record: IterableChangeRecord_<V>) => void) forEachMovedItem(fn: (record: IterableChangeRecord_<V>) => void) forEachRemovedItem(fn: (record: IterableChangeRecord_<V>) => void) forEachIdentityChange(fn: (record: IterableChangeRecord_<V>) => void) diff(collection: NgIterable<V>): DefaultIterableDiffer<V> | null onDestroy() check(collection: NgIterable<V>): boolean }
      
      class DefaultIterableDiffer<V> implements IterableDiffer, IterableChanges {
  constructor(trackByFn?: TrackByFunction<V>)
  length: number
  collection: V[] | Iterable<V> | null
  isDirty: boolean
  forEachItem(fn: (record: IterableChangeRecord_<V>) => void)
  forEachOperation(fn: (item: IterableChangeRecord<V>, previousIndex: number, currentIndex: number) => void)
  forEachPreviousItem(fn: (record: IterableChangeRecord_<V>) => void)
  forEachAddedItem(fn: (record: IterableChangeRecord_<V>) => void)
  forEachMovedItem(fn: (record: IterableChangeRecord_<V>) => void)
  forEachRemovedItem(fn: (record: IterableChangeRecord_<V>) => void)
  forEachIdentityChange(fn: (record: IterableChangeRecord_<V>) => void)
  diff(collection: NgIterable<V>): DefaultIterableDiffer<V> | null
  onDestroy()
  check(collection: NgIterable<V>): boolean
}

构造函数

constructor(trackByFn?: TrackByFunction<V>)
      
      constructor(trackByFn?: TrackByFunction<V>)
参数
trackByFn TrackByFunction

可选. 默认值是 undefined.

属性

属性说明
length: number 只读
collection: V[] | Iterable<V> | null 只读
isDirty: boolean 只读

方法

forEachItem()

forEachItem(fn: (record: IterableChangeRecord_<V>) => void)
      
      forEachItem(fn: (record: IterableChangeRecord_<V>) => void)
参数
fn (record: IterableChangeRecord_) => void

forEachOperation()

forEachOperation(fn: (item: IterableChangeRecord<V>, previousIndex: number, currentIndex: number) => void)
      
      forEachOperation(fn: (item: IterableChangeRecord<V>, previousIndex: number, currentIndex: number) => void)
参数
fn (item: IterableChangeRecord, previousIndex: number, currentIndex: number) => void

forEachPreviousItem()

forEachPreviousItem(fn: (record: IterableChangeRecord_<V>) => void)
      
      forEachPreviousItem(fn: (record: IterableChangeRecord_<V>) => void)
参数
fn (record: IterableChangeRecord_) => void

forEachAddedItem()

forEachAddedItem(fn: (record: IterableChangeRecord_<V>) => void)
      
      forEachAddedItem(fn: (record: IterableChangeRecord_<V>) => void)
参数
fn (record: IterableChangeRecord_) => void

forEachMovedItem()

forEachMovedItem(fn: (record: IterableChangeRecord_<V>) => void)
      
      forEachMovedItem(fn: (record: IterableChangeRecord_<V>) => void)
参数
fn (record: IterableChangeRecord_) => void

forEachRemovedItem()

forEachRemovedItem(fn: (record: IterableChangeRecord_<V>) => void)
      
      forEachRemovedItem(fn: (record: IterableChangeRecord_<V>) => void)
参数
fn (record: IterableChangeRecord_) => void

forEachIdentityChange()

forEachIdentityChange(fn: (record: IterableChangeRecord_<V>) => void)
      
      forEachIdentityChange(fn: (record: IterableChangeRecord_<V>) => void)
参数
fn (record: IterableChangeRecord_) => void

diff() 

      
      diff(collection: NgIterable<V>): DefaultIterableDiffer<V> | null
参数
collection NgIterable
返回值

DefaultIterableDiffer<V> | null

onDestroy()

onDestroy()
      
      onDestroy()
参数

没有参数。

check()

check(collection: NgIterable<V>): boolean
      
      check(collection: NgIterable<V>): boolean
参数
collection NgIterable
返回值

boolean