此外，您还可以在历史记录为空的情况下使用此服务与回退功能

url-back.service.ts

import { Injectable } from '@angular/core';
import { Location } from '@angular/common';

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

const EMPTY_HISTORY_LENGTH = 2;

/**
 * This service helps to Navigate back to the prev page, and if no prev page,
 * will redirect to the fallback url.
 */
@Injectable()
export class UrlBackService {
  constructor(private router: Router, private location: Location) {}

  /**
   * This method will back you to the previous page,
   * if no previous page exists, will redirect you to the fallback url.
   * @param href - url, if tryNativeFirst is provided, this is fallback url
   * @param tryNativeFirst - try to go back natively using browser history state.
   */
  back(href: string, tryNativeFirst: boolean = false) {
    if (tryNativeFirst) {
      if (history.length === EMPTY_HISTORY_LENGTH) {
        this.router.navigate(UrlBackService.urlToArray(href));
      } else {
        this.location.back();
      }
    } else {
      this.router.navigate(UrlBackService.urlToArray(href));
    }
  }

  /**
   * In case that router.navigate method tries to escape all '/' in the string,
   * was decided to split string to array, and if URL starts or ends with slash - remove them, eg:
   * /my/url will be split to ['', 'my', 'url'], so we need to remove empty spaces use filter function.
   * @param href
   * @private
   */
  private static urlToArray(href: string) {
    return href.split('/').filter((notEmpty) => notEmpty);
  }
}

url-back.service.spec.ts

import { TestBed } from '@angular/core/testing';

import { UrlBackService } from './url-back.service';
import { Router } from '@angular/router';
import { Location } from '@angular/common';
import { RouterTestingModule } from '@angular/router/testing';

describe('UrlBackService', () => {
  let service: UrlBackService;
  let router: Router;
  let location: Location;

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [RouterTestingModule],
      providers: [UrlBackService],
    });
    service = TestBed.inject(UrlBackService);
    router = TestBed.inject(Router);
    location = TestBed.inject(Location);
  });

  it('should be created', () => {
    expect(service).toBeTruthy();
  });

  it('no meter what history state is, it should be redirected to the /my/url', () => {
    spyOn(router, 'navigate');
    service.back('/my/url');
    expect(router.navigate).toHaveBeenCalledWith(['my', 'url']);
  });

  it('in case history is empty push to /my/url', () => {
    spyOn(router, 'navigate');
    service.back('/my/url', true);
    expect(router.navigate).toHaveBeenCalledWith(['my', 'url']);
  });

  it('in case history is NOT empty push to url1', () => {
    spyOn(location, 'back');
    window.history.pushState(null, '', 'url1');

    service.back('/my/url', true);
    expect(location.back).toHaveBeenCalled();
  });
});

是的，你能做到。在你的typescript组件上编写这段代码，然后享受吧!

import { Location } from '@angular/common'
import { Component, Input } from '@angular/core'

@Component({
    selector: 'return_page',
    template: `<button mat-button (click)="onReturn()">Back</button>`,
})
export class ReturnPageComponent {
  constructor(private location: Location) { }

  onReturn() {
    this.location.back();
  }
}

实际上，你可以利用内置的位置服务，它拥有一个“返回”API。

这里(TypeScript中):

import {Component} from '@angular/core';
import {Location} from '@angular/common';

@Component({
  // component's declarations here
})
class SomeComponent {

  constructor(private _location: Location) 
  {}

  backClicked() {
    this._location.back();
  }
}

编辑:正如@charith所提到的。Location应该从@angular/common中导入，所以从@angular/common中导入{Location};线条很重要。

要返回而不刷新页面，我们可以像下面这样在html中做 javascript: history.back ()

<a class="btn btn-danger" href="javascript:history.back()">Go Back</a>

也许你想检查之前的历史点是否在你的应用程序中。例如，如果你直接进入你的应用程序并执行location.back()(例如，通过按下工具栏中的<- back按钮)，你会回到浏览器的主页面，而不是去应用程序中的其他地方。

这是我检查这个的方法:

import { Component } from '@angular/core';
import { ActivatedRoute, Router } from '@angular/router';
import { Location } from '@angular/common';

@Component({
  selector: 'app-foo',
  template: ''
})
export class FooComponent {

  private readonly canGoBack: boolean;

  constructor(
    private readonly route: ActivatedRoute,
    private readonly router: Router,
    private readonly location: Location
  ) {
    // This is where the check is done. Make sure to do this
    // here in the constructor, otherwise `getCurrentNavigation()`
    // will return null. 
    this.canGoBack = !!(this.router.getCurrentNavigation()?.previousNavigation);
  }

  goBack(): void {
    if (this.canGoBack) {
      // We can safely go back to the previous location as
      // we know it's within our app.
      this.location.back();
    } else {
      // There's no previous navigation.
      // Here we decide where to go. For example, let's say the
      // upper level is the index page, so we go up one level.
      this.router.navigate(['..'], {relativeTo: this.route});
    }
  }

}

我们检查加载当前路由的导航是否有前一个兄弟。这必须在导航过程仍处于活动状态时在构造函数中完成。

但也有一些注意事项:

即使之前的位置实际上在我们的应用程序中，但页面被刷新，canGoBack也将为false。 用户可能想通过点击浏览器的返回按钮“返回”到上一页(goBack()发生的地方)，但由于应用程序返回历史而不是按一个新的位置，用户将会返回得更远，可能会感到困惑。

只需使用Location，这是一个Angular服务，应用程序可以使用它与浏览器的URL进行交互。

导入:

import { Location } from '@angular/common';

注射:

constructor(private location: Location) { }

简单地使用它:

goBack() {
    this.location.back(); // Navigates back in the platform's history
}