当你有一个空路由对象时，这主要是因为你没有在app.component.html中使用路由器出口。

如果没有这个，你将无法获得一个有意义的非空子对象的路由对象，特别是params和queryParams。

尝试添加<router-outlet><router-outlet> < app-main-component > < / app-main-component >

在此之前，确保你在App -routing >中准备好了查询参数，它导出了App组件使用的类Route:

param: '/param/:dynamicParam', path: MyMainComponent

当然，最后一件事，为了获得你的参数，我个人使用this.route.snapshot.params.dynamicParam，其中dynamicParam是在你的app-routing组件中使用的名称:)

查询和路径参数(Angular 8)

url，如https://myapp.com/user/666/read?age=23使用

import { combineLatest } from 'rxjs';
// ...

combineLatest( [this.route.paramMap, this.route.queryParamMap] )
  .subscribe( ([pathParams, queryParams]) => {
    let userId = pathParams.get('userId');    // =666
    let age    = queryParams.get('age');      // =23
    // ...
  })

更新

如果你使用this.router.navigate([someUrl]);你的查询参数被嵌入到someUrl字符串中，然后angular对URL进行编码，你会得到类似https://myapp.com/user/666/read%3Fage%323的东西——以上解决方案会给出错误的结果(queryParams将为空，路径参数可以粘在最后一个路径参数上，如果它在路径端)。在这种情况下，改变导航的方式

this.router.navigateByUrl(someUrl);

简单的解决方案

 // in routing file
       {
            path: 'checkout/:cartId/:addressId',
            loadChildren: () => import('./pages/checkout/checkout.module').then(m => m.CheckoutPageModule)
          },

    // in Component file

            import { Router, ActivatedRoute } from '@angular/router';

                 constructor(
                      private _Router: ActivatedRoute
                  ) { }

                  ngOnInit() {
                    this.cartId = this._Router.snapshot.params.cartId;
                    this.addressId = this._Router.snapshot.params.addressId;
                    console.log(this.addressId, "addressId")
                    console.log(this.cartId, "cartId")
                  }

import { ParamMap, Router, ActivatedRoute } from '@angular/router';

constructor(private route: ActivatedRoute) {}

ngOnInit() {
    console.log(this.route.snapshot.queryParamMap);
}

更新

import { Router, RouterStateSnapshot } from '@angular/router';

export class LoginComponent {
    constructor(private router: Router) {
        const snapshot: RouterStateSnapshot = router.routerState.snapshot;
        console.log(snapshot);  // <-- hope it helps
    }
}

父组件从ActivatedRoute获取空参数

对我有用:

import {Component, OnDestroy, OnInit} from '@angular/core';
import { Router, ActivatedRoute, Params, RoutesRecognized } from '@angular/router';

@Component({
  selector: 'app-navigation-bar',
  templateUrl: './navigation-bar.component.html',
  styleUrls: ['./navigation-bar.component.scss']
})
export class NavigationBarComponent implements OnInit, OnDestroy {
  private sub: any;
  constructor(private route: ActivatedRoute, private router: Router) {}

  ngOnInit() {
    this.sub = this.router.events.subscribe(val => {
      if (val instanceof RoutesRecognized) {
        console.log(val.state.root.firstChild.params);
      }
    });
  }

  ngOnDestroy() {
    this.sub.unsubscribe();
  }

}

最好的解决方案是使用ActivatedRoute:

    constructor(private route: ActivatedRoute) {}
    
    ngOnInit(): void {
        this.route.queryParams.subscribe((params) => {
         console.log(params);
         const queryparams = params['queryName'];
        });
    }