Before we try to answer what is wrong with the code, lets try to refactor it to a shorter code. import { Component, Inject, OnInit } from ... ... <看更多>

* Reports that a FormControl is invalid, meaning that an error exists in the input value. *. * @see `status`. */. ... <看更多>

import { FormControl } from '@angular/forms'; @Component({ selector: 'app-name-editor', templateUrl: './name-editor.component.html', ... <看更多>

declare module '@angular/forms' { interface AbstractControl { focused: ... the new properties defined in the class which extends FormControl by default. ... <看更多>