import { Component } from '@angular/core';
import { FormGroup, FormControl } from '@angular/forms';

@Component({
  selector: 'app-root',
  // templateUrl: './app.component.html',
  template: `
    <form [formGroup]="loginForm">
      账号: <input type="text" formControlName="username"  /> <br>
      密码: <input type="text" formControlName="password" /> <br>
      <button (click)="submit()">提交</button>
    </form>
  `,
  styleUrls: ['./app.component.css'],
})
export class AppComponent {
  
  loginForm: FormGroup = new FormGroup({
    username: new FormControl(),
    password: new FormControl(),
  });

  submit(){
    debugger
    console.log(this.loginForm)
  }
}

用之前，记得在根模块里导入