ng-alain通过路由守护解决token失效导致弹出多条提示

1、在路由中进行配置，当token失效时不允许再跳转到模块

    1）编写LoginGuard 服务

import { CanActivate, CanActivateChild } from '@angular/router';
import { Observable } from 'rxjs';
import { Inject, Injector, Injectable } from '@angular/core';
import { TokenService, DA_SERVICE_TOKEN } from '@delon/auth';
import { AppUtil } from '@core/util/util.service';
import { Router } from '@angular/router';
import { StartupService } from '@core/startup/startup.service';

@Injectable()
export class LoginGuard implements CanActivate, CanActivateChild {
  constructor(
    @Inject(DA_SERVICE_TOKEN) private tokenService: TokenService,
    private util: AppUtil,
    private router: Router,
    private injector: Injector,
    public st: StartupService,
  ) {}
  canActivate(): Observable | Promise | boolean {
    return this.logIn();
  }
  canActivateChild(): Observable | Promise | boolean {
    return this.logIn();
  }
  private logIn() {
    const token = this.tokenService.get();
    // const autoLogin = this.util.getAutoLogin(); // 缓存此处不需要判断，token失效就强制退出了
    // 处理token失效 不允许进行路由跳转，强制跳转到登录页面
    if (!token || this.util.isEmptyObject(token) || !this.st.firstLoad) {
      this.goTo('/passport/login');
      return false;
    } else {
      return true;
    }
  }
  private goTo(url: string) {
    setTimeout(() => this.injector.get(Router).navigateByUrl(url));
  }
}

    2）在路由中进行配置

const routes: Routes = [
  {
    path: '',
    component: LayoutDefaultComponent,
    children: [
      {
        path: '',
        redirectTo: 'dashboard/v1',
        pathMatch: 'full',
        canActivate: [LoginGuard],
      },
      {
        path: 'dashboard',
        redirectTo: 'dashboard/v1',
        pathMatch: 'full',
        canActivate: [LoginGuard],
      },
      {
        path: 'dashboard/v1',
        component: DashboardV1Component,
        canActivate: [LoginGuard],
      },
      {
        path: 'soc',
        loadChildren: './soc/soc.module#SocModule',
        canActivate: [LoginGuard],
      },
    ],
    canActivateChild: [ LoginGuard ],
  },
  {
    path: 'passport',
    component: LayoutPassportComponent,
    children: [
      {
        path: 'login',
        component: UserLoginComponent,
        data: { title: '登录', titleI18n: 'pro-login' },
      },
    ],
  },
  // 单页不包裹Layout
  { path: 'callback/:type', component: CallbackComponent },
  {
    path: 'lock',
    component: UserLockComponent,
    data: { title: '锁屏', titleI18n: 'lock' },
  },
  { path: '403', component: Exception403Component },
  { path: '404', component: Exception404Component },
  { path: '500', component: Exception500Component },
  { path: '**', redirectTo: 'dashboard', canActivate: [LoginGuard]},
];

2、编辑自动登录本地缓存的存取

public getAutoLogin() {
  const autoLogin = localStorage.getItem('autoLogin');
  if (autoLogin === 'true') {
    return true;
  } else {
    return false;
  }
}
public setAutoLogin(val) {
  localStorage.setItem('autoLogin', val);
}