Using Other Components

Components depend on other components, directives and pipes. For example, TodoListComponent relies on TodoItemComponent. To let a component know about these dependencies we group them into a module.

import {NgModule} from '@angular/core';
import {TodoListComponent} from './components/todo-list.component';
import {TodoItemComponent} from './components/todo-item.component';
import {TodoInputComponent} from './components/todo-input.component';
@NgModule({
  imports: [ ... ],
  declarations: [
    TodoListComponent,
    TodoItemComponent,
    TodoInputComponent
  ],
  bootstrap: [ ... ]
})
export class ToDoAppModule {
}

The property declarations expects an array of components, directives and pipes that are part of the module.

Please see the Modules section for more info about NgModule.

原文: https://angular-2-training-book.rangle.io/handout/components/using_other_components.html