如果用户已经登录，则Angular登录组件重定向

ng generate guard auth

import { Injectable } from '@angular/core';
import { CanActivate, Router } from '@angular/router';

@Injectable({
  providedIn: 'root'
})
export class AuthGuard implements CanActivate {

  constructor(private router: Router) {}

  canActivate(): boolean {
    // 在这里进行登录状态的验证
    if (用户已登录) {
      return true;
    } else {
      // 未登录，重定向到登录页面
      this.router.navigate(['/login']);
      return false;
    }
  }
}

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { HomeComponent } from './home/home.component';
import { AuthGuard } from './auth.guard';

const routes: Routes = [
  { path: 'home', component: HomeComponent, canActivate: [AuthGuard] },
  // 其他路由配置...
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }