Angular中的StaticInjector与ReflectiveInjector

How is it different from existing ReflectiveInjector?

ReflectiveInjector

依靠Reflect库提供的反射功能来提取提供者的隐式依赖关系,因此名称为Reflective：

class B {}
class A {
  constructor(@Inject(B) b) { } <----- `B` is implicit dependency
}

const i = ReflectiveInjector.resolveAndCreate([A,B]);

@Inject装饰器定义指定隐式依赖关系的元数据,ReflectiveInjector使用此元数据.

StaticInjector

不使用反射功能并且需要明确指定依赖项：

class B {}
class A { constructor(b) {} }
const i = Injector.create([{provide: A,useClass: A,deps: [B]]};
const a = i.get(A);

Will it break any of my existing code?
The change will only affect providers supplied to platform and compiler providers. So if you provided them like this:

class B1 {}
class A1 { constructor(@Inject(B1) b) {} }

class B2 {}
class A2 { constructor(@Inject(B2) b) {} }
bootstrapModule(AppModule,{providers: [A1,B1]}).platformBrowserDynamic([A2,B2])

您现在应该将其更改为：

class B1 {}
class A1 { constructor(b) {} }

class B2 {}
class A2 { constructor(b) {} }

platformBrowserDynamic([{ provide: A1,useClass: A1,deps: [B1] },B1])
.bootstrapModule(AppModule,{ providers: [ {provide: A2,useClass: A2,deps: [B2]},B2 ] })

ReflectiveInjector仍然标记为稳定,因此您可以继续使用它.但是很有可能它将来被删除.我建议你一旦可用就开始使用StaticInjector.