API 参考手册
API > @angular/core

KeyValueDiffers

A repository of different Map diffing strategies used by NgClass, NgStyle, and others.

      
      class KeyValueDiffers {
  static ngInjectableDef: defineInjectable({...})
  static create<S>(factories: KeyValueDifferFactory[], parent?: KeyValueDiffers): KeyValueDiffers
  static extend<S>(factories: KeyValueDifferFactory[]): StaticProvider
  constructor(factories: KeyValueDifferFactory[])
  factories: KeyValueDifferFactory[]
  find(kv: any): KeyValueDifferFactory
}

静态属性

属性说明
static ngInjectableDef: defineInjectable({ providedIn: 'root', factory: () => new KeyValueDiffers([new DefaultKeyValueDifferFactory()]) })

静态方法

create()

static create<S>(factories: KeyValueDifferFactory[], parent?: KeyValueDiffers): KeyValueDiffers
      
      static create<S>(factories: KeyValueDifferFactory[], parent?: KeyValueDiffers): KeyValueDiffers
参数
factories KeyValueDifferFactory[]
parent KeyValueDiffers

可选. 默认值是 undefined.

返回值

KeyValueDiffers

extend()

Takes an array of KeyValueDifferFactoryand returns a provider used to extend the inherited KeyValueDiffersinstance with the provided factories and return a new KeyValueDiffersinstance.

static extend<S>(factories: KeyValueDifferFactory[]): StaticProvider
      
      static extend<S>(factories: KeyValueDifferFactory[]): StaticProvider
参数
factories KeyValueDifferFactory[]
返回值

StaticProvider

使用说明

Example

The following example shows how to extend an existing list of factories, which will only be applied to the injector for this component and its children. This step is all that's required to make a new KeyValueDifferavailable.

@Component({ viewProviders: [ KeyValueDiffers.extend([new ImmutableMapDiffer()]) ] })
      
      @Component({
  viewProviders: [
    KeyValueDiffers.extend([new ImmutableMapDiffer()])
  ]
})

构造函数

constructor(factories: KeyValueDifferFactory[])
      
      constructor(factories: KeyValueDifferFactory[])
参数
factories KeyValueDifferFactory[]

属性

属性说明
factories: KeyValueDifferFactory[]

方法

find()

find(kv: any): KeyValueDifferFactory
      
      find(kv: any): KeyValueDifferFactory
参数
kv any
返回值

KeyValueDifferFactory