这是我想出来的，你也可以查一下是否有上一页。 确保在你的appComponent中使用了这个服务。

import { Injectable } from '@angular/core';
import { Location } from '@angular/common';
import { NavigationEnd, Router } from '@angular/router';

interface HistoryData {
  previousPage: string | null,
  currentPage: string | null,
}

@Injectable({ providedIn: 'root' })
export class GoBackService {

  private historyData: HistoryData = { previousPage: null, currentPage: null };

  constructor(private router: Router, private location: Location) {
    this.router.events.subscribe((event) => {
      if (event instanceof NavigationEnd) {
        this.historyData.previousPage = this.historyData.currentPage;
        this.historyData.currentPage = event.urlAfterRedirects;
      }
    });
  }

  public goBack(): void {
    if (this.historyData.previousPage) this.location.back();
  }

  public canGoBack(): boolean {
    return Boolean(this.historyData.previousPage);
  }

}

试试routerLink = " - LASTPAGE”

你可以在你的路由类上实现routerOnActivate()方法，它会提供之前路由的信息。

routerOnActivate(nextInstruction: ComponentInstruction, prevInstruction: ComponentInstruction) : any

然后你可以使用router.navigateByUrl()并传递ComponentInstruction生成的数据。例如:

this._router.navigateByUrl(prevInstruction.urlPath);

另一个解决方案

window.history.back ();

我是这么说的:

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

@Component({
    selector: 'Back_page',
    template: `<button  (click)="onBack()">Back</button>`,
})
export class BackPageComponent {
  constructor(private location: Location) { }

  onBack() {
    this.location.back();// <-- go back to previous location
  }
}

这是我想出来的，你也可以查一下是否有上一页。 确保在你的appComponent中使用了这个服务。

import { Injectable } from '@angular/core';
import { Location } from '@angular/common';
import { NavigationEnd, Router } from '@angular/router';

interface HistoryData {
  previousPage: string | null,
  currentPage: string | null,
}

@Injectable({ providedIn: 'root' })
export class GoBackService {

  private historyData: HistoryData = { previousPage: null, currentPage: null };

  constructor(private router: Router, private location: Location) {
    this.router.events.subscribe((event) => {
      if (event instanceof NavigationEnd) {
        this.historyData.previousPage = this.historyData.currentPage;
        this.historyData.currentPage = event.urlAfterRedirects;
      }
    });
  }

  public goBack(): void {
    if (this.historyData.previousPage) this.location.back();
  }

  public canGoBack(): boolean {
    return Boolean(this.historyData.previousPage);
  }

}