返回上一页，其中包含以前在angular 8中输入的数据

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

@Component({
  // 组件配置
})
export class MyComponent {
  constructor(private location: Location) {}

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

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

@Component({
  // 组件配置
})
export class MyComponent {
  constructor(private router: Router, private route: ActivatedRoute) {}

  goBackWithData() {
    const previousData = 'Your previous data'; // 替换为之前输入的数据
    this.router.navigate(['previous-page'], { queryParams: { data: previousData } });
  }
}

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

@Component({
  // 组件配置
})
export class PreviousPageComponent {
  previousData: string;

  constructor(private route: ActivatedRoute) {}

  ngOnInit() {
    this.route.queryParams.subscribe(params => {
      this.previousData = params['data'];
    });
  }
}