在某些情况下，您可能需要由父组件执行业务逻辑。在下面的例子中，我们有一个子组件，它根据父组件提供的逻辑来呈现表行:

@Component({
  ...
  template: '<table-component [getRowColor]="getColor"></table-component>',
  directives: [TableComponent]
})
export class ParentComponent {

 // Pay attention on the way this function is declared. Using fat arrow (=>) declaration 
 // we can 'fixate' the context of `getColor` function
 // so that it is bound to ParentComponent as if .bind(this) was used.
 getColor = (row: Row) => {
    return this.fancyColorService.getUserFavoriteColor(row);
 }

}

@Component({...})
export class TableComponent{
  // This will be bound to the ParentComponent.getColor. 
  // I found this way of declaration a bit safer and convenient than just raw Function declaration
  @Input('getRowColor') getRowColor: (row: Row) => Color;

  renderRow(){
    ....
    // Notice that `getRowColor` function holds parent's context because of a fat arrow function used in the parent
    const color = this.getRowColor(row);
    renderRow(row, color);
  }
}

所以，我想在这里演示两件事:

胖箭头(=>)代替.bind(this)来保存正确的上下文; 子组件中回调函数的类型安全声明。

在某些情况下，您可能需要由父组件执行业务逻辑。在下面的例子中，我们有一个子组件，它根据父组件提供的逻辑来呈现表行:

@Component({
  ...
  template: '<table-component [getRowColor]="getColor"></table-component>',
  directives: [TableComponent]
})
export class ParentComponent {

 // Pay attention on the way this function is declared. Using fat arrow (=>) declaration 
 // we can 'fixate' the context of `getColor` function
 // so that it is bound to ParentComponent as if .bind(this) was used.
 getColor = (row: Row) => {
    return this.fancyColorService.getUserFavoriteColor(row);
 }

}

@Component({...})
export class TableComponent{
  // This will be bound to the ParentComponent.getColor. 
  // I found this way of declaration a bit safer and convenient than just raw Function declaration
  @Input('getRowColor') getRowColor: (row: Row) => Color;

  renderRow(){
    ....
    // Notice that `getRowColor` function holds parent's context because of a fat arrow function used in the parent
    const color = this.getRowColor(row);
    renderRow(row, color);
  }
}

所以，我想在这里演示两件事:

胖箭头(=>)代替.bind(this)来保存正确的上下文; 子组件中回调函数的类型安全声明。

SnareChops给出的另一个答案。

你可以在模板中使用.bind(this)来达到同样的效果。它可能没有那么干净，但它节省了几行。我现在使用的是angular 2.4.0

@Component({
  ...
  template: '<child [myCallback]="theCallback.bind(this)"></child>',
  directives: [ChildComponent]
})
export class ParentComponent {

  public theCallback(){
    ...
  }
}

@Component({...})
export class ChildComponent{
  //This will be bound to the ParentComponent.theCallback
  @Input()
  public myCallback: Function; 
  ...
}

使用可观察模式。你可以把可观察值(不是主题)放入输入参数，并从父组件管理它。你不需要回调函数。

参见示例:https://stackoverflow.com/a/49662611/4604351

传递带有参数的方法，在模板中使用.bind

@Component({
  ...
  template: '<child [action]="foo.bind(this, 'someArgument')"></child>',
  ...
})
export class ParentComponent {
  public foo(someParameter: string){
    ...
  }
}

@Component({...})
export class ChildComponent{

  @Input()
  public action: Function; 

  ...
}

目前的答案可以简化为……

@Component({
  ...
  template: '<child [myCallback]="theCallback"></child>',
  directives: [ChildComponent]
})
export class ParentComponent{
  public theCallback(){
    ...
  }
}

@Component({...})
export class ChildComponent{
  //This will be bound to the ParentComponent.theCallback
  @Input()
  public myCallback: Function; 
  ...
}