我应该如何从另一个 Injectable 扩展 Injectable，并在 angular2 中进行多次注射？

Question

有没有可能做这样的事情？（因为我尝试过，但没有成功）：

@Injectable()
class A {
  constructor(private http: Http){ // <-- Injection in root class
  }
  foo(){
    this.http.get()...
  };
}


@Injectable()
class B extends A{
  bar() {
    this.foo();
  }
}

Answer 1

有点 - 您必须 super 调用基础 class 的构造函数。只需传递所需的依赖项：

@Injectable()
class A {
  constructor(private http: Http){ // <-- Injection in root class
  }
  foo(){
    this.http.get()...
  };
}


@Injectable()
class B extends A{
  constructor(http: Http) {
    super(http);
  }

  bar() {
    this.foo();
  }
}

See this discussion, why there is no way around it.

Answer 2

这肯定能解决您的问题。

@Injectable()
class A {
  constructor(private http: Http){ // <-- Injection in root class
  }
  foo(http:Http){    //<------receive parameter as Http type 
     http.get()...   //<------this will work for sure.
  };
}

import {Http} from '@angular/http';
@Injectable()
class B extends A{
  constructor(private http:Http){}

  bar() {
    this.foo(this.http);   //<----- passing this.http as a parameter
  }
}

我应该如何从另一个 Injectable 扩展 Injectable，并在 angular2 中进行多次注射？

How should I extend Injectable from another Injectable with many Injections in angular2?

angular

typescript

dependency-injection

inject

injectable