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我是Angular 2的菜鸟.我正在做YouTube教程,但是每个教程都有directives:我被卡住的部分.

app.component.ts

import { Component } from '@angular/core';
import { HeaderComponent } from './components/header/header.component'
@Component({
  selector: 'my-app',
  template: '<h1>Hello</h1><header></header>',
  directives: [HeaderComponent]
})
export class AppComponent { }

错误输出是:

Argument of type '{ selector: string; template: string; directives: typeof HeaderComponent[]; }' is not assignable to parameter of type 'ComponentMetadataType'.at line 6 col 3

header.component.ts

import { Component } from '@angular/core';

@Component ({

  selector: 'header',
  template: '<h2>hit!</h2>'

})
export class HeaderComponent { }

这是错误的屏幕截图