Angular 角形罐'；无法解析所有参数

您好，我有一个错误，来自angular

无法解析RoomService:（？）的所有参数。

我有这两个文件，在服务上

客房服务.ts

import { Injectable } from '@angular/core';
import { ResourceService } from './resource.service';
import { Http } from '@angular/http';
import { CONFIG as APP_CONSTANTS } from '../config/config';

@Injectable()
export class RoomService extends ResourceService {

  constructor(http) {
    super(http);
  }

}

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

// Angular Material
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { MaterialComponents } from '../ngcomponents/material.component';

import { AppRoutingModule } from './app-routing.module';

// Components
import { AppComponent } from './app.component';
import { RoomlistComponent } from './components/roomlist/roomlist.component';

// services
import { HttpModule } from '@angular/http';
import { RoomService } from './services/room.service';

@NgModule({
  declarations: [
    AppComponent,
    RoomlistComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    HttpModule,
    BrowserAnimationsModule,
    MaterialComponents
  ],
  providers: [RoomService],
  bootstrap: [AppComponent]
})
export class AppModule { }

应用程序模块.ts

import { Injectable } from '@angular/core';
import { ResourceService } from './resource.service';
import { Http } from '@angular/http';
import { CONFIG as APP_CONSTANTS } from '../config/config';

@Injectable()
export class RoomService extends ResourceService {

  constructor(http) {
    super(http);
  }

}

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

// Angular Material
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { MaterialComponents } from '../ngcomponents/material.component';

import { AppRoutingModule } from './app-routing.module';

// Components
import { AppComponent } from './app.component';
import { RoomlistComponent } from './components/roomlist/roomlist.component';

// services
import { HttpModule } from '@angular/http';
import { RoomService } from './services/room.service';

@NgModule({
  declarations: [
    AppComponent,
    RoomlistComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    HttpModule,
    BrowserAnimationsModule,
    MaterialComponents
  ],
  providers: [RoomService],
  bootstrap: [AppComponent]
})
export class AppModule { }

---

我不知道会有什么问题，任何想法，以防万一，正如你看到RoomService是从另一个文件资源服务扩展而来的，我不知道这是否是问题，但我不这么认为。

构造函数应该有

http

参数作为

http

类型。依赖解析程序应该通过它来创建

Http

injector的标记

constructor(http: Http) {
   super(http);
}

---

Angular无法确定要传递什么，因为

http

没有类型注释

constructor(http) {

如果你把它改成

constructor(http:Http) {

并将

HttpModule

添加到

AppModule

的

imports:[…]

，它应该可以工作。 您还需要为

Http

添加类型脚本导入

另见

---

在客房服务中，您应该

 constructor(http: Http) {
    super(http);
  }