Anglar Forms，需要一些简单的例子

<form>
  <input type="text" name="username" [(ngModel)]="username" required>
  <input type="password" name="password" [(ngModel)]="password" required>
  <button type="submit">登录</button>
</form>

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

@Component({
  selector: 'app-login',
  template: `
    <form [formGroup]="loginForm" (ngSubmit)="onSubmit()">
      <input type="text" formControlName="username" required>
      <input type="password" formControlName="password" required>
      <button type="submit">登录</button>
    </form>
  `
})
export class LoginComponent {
  loginForm: FormGroup;

  constructor() {
    this.loginForm = new FormGroup({
      username: new FormControl('', Validators.required),
      password: new FormControl('', Validators.required)
    });
  }

  onSubmit() {
    if (this.loginForm.valid) {
      // 处理表单提交逻辑
    }
  }
}