Angular 中依赖注入是它最核心的概念，我们可以通过对构造函数参数定义的类型来让服务自动被注入进来
@Injectable()
class HeroService {
constructor(private messageService: MessageService) { }
}������看到这里就不禁很好奇，Angular 是如何�实现这样的依赖注入的呢？服务从何而来，又是如何根据构造函数参数的类型来进行适配的呢？
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angular 依赖注入原理的最简单实现
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