AngularJs组件内部方法抛出全局调用方法

export class VoRequestProjectWfComponent extends ComponentBase implements OnInit {
 constructor(private injector: Injector, private apiService: ApiService,
    private configService: ConfigService,
    private route: ActivatedRoute,
    private _renderer2: Renderer2,
    @Inject(DOCUMENT) private _document: Document,
    zone: NgZone) {
    super(injector)

    //映射注册
    window['VoRequestProjectWfComponent'] = { component: this, zone: zone };
  }

  ngOnDestroy() {
    //映射注销
    window['VoRequestProjectWfComponent'] = null;
  }

  ngOnInit() {
    setTimeout(() => {
      //跳转到编辑页面
      let script = this._renderer2.createElement('script');
      script.type = `text/javascript`;
      script.text += `
        function validForm(){
          window.VoRequestProjectWfComponent.component.validForm();
        }
    `;
     this._renderer2.appendChild(this._document.body, script);
    }, 3000);
 }

   validForm() {

    debugger

   }

}