defineInjectablelink
Construct an InjectableDef
which defines how a token will be constructed by the DI system, and in which injectors (if any) it will be available.
参数
opts | Type: |
返回值
never
说明
This should be assigned to a static ngInjectableDef
field on a type, which will then be an InjectableType
.
Options:
providedIn
determines which injectors will include the injectable, by either associating it with an@NgModule
or otherInjectorType
, or by specifying that this injectable should be provided in the'root'
injector, which will be the application-level injector in most apps.factory
gives the zero argument function which will create an instance of the injectable. The factory can callinject
to access theInjector
and request injection of dependencies.