import { Component } from '@angular/core'; import { Router } from '@angular/router'; import { RegisterPage } from '../register/register.page'; @Component({   selector: 'app-login',   templateUrl: 'login.page.html',   styleUrls: ['login.page.scss'] }) export class LoginPage {   username: string='';   password: string='';   loginFailed: boolean = false;   constructor(private router: Router) {}   goToFirst() {     // 真实项目中应该调用后端API验证用户名和密码         // 这里简单模拟登录成功     this.router.navigate(['/tabs']);   }   goToRegister() {     this.router.navigate(['/register']);   } }