如何在angular组件之间传递数据？

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

@Component({
  selector: 'app-parent',
  template: `
    <h1>Parent Component</h1>
    <app-child [data]="parentData" (dataChanged)="onDataChanged($event)"></app-child>
  `
})
export class ParentComponent {
  parentData: string = 'Hello from parent';

  onDataChanged(data: string) {
    console.log('Data changed in parent:', data);
  }
}

import { Component, Input, Output, EventEmitter } from '@angular/core';

@Component({
  selector: 'app-child',
  template: `
    <h2>Child Component</h2>
    <p>{{ data }}</p>
    <button (click)="changeData()">Change Data</button>
  `
})
export class ChildComponent {
  @Input() data: string;
  @Output() dataChanged: EventEmitter<string> = new EventEmitter<string>();

  changeData() {
    this.data = 'New data from child';
    this.dataChanged.emit(this.data);
  }
}

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

@Injectable()
export class DataService {
  private sharedData: string;

  getData(): string {
    return this.sharedData;
  }

  setData(data: string) {
    this.sharedData = data;
  }
}

import { Component } from '@angular/core';
import { DataService } from './data.service';

@Component({
  selector: 'app-component-a',
  template: `
    <h1>Component A</h1>
    <p>{{ data }}</p>
    <button (click)="changeData()">Change Data</button>
  `,
  providers: [DataService]
})
export class ComponentA {
  data: string;

  constructor(private dataService: DataService) {
    this.data = this.dataService.getData();
  }

  changeData() {
    this.data = 'New data from Component A';
    this.dataService.setData(this.data);
  }
}

import { Component } from '@angular/core';
import { DataService } from './data.service';

@Component({
  selector: 'app-component-b',
  template: `
    <h1>Component B</h1>
    <p>{{ data }}</p>
    <button (click)="changeData()">Change Data</button>
  `,
  providers: [DataService]
})
export class ComponentB {
  data: string;

  constructor(private dataService: DataService) {
    this.data = this.dataService.getData();
  }

  changeData() {
    this.data = 'New data from Component B';
    this.dataService.setData(this.data);
  }
}

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { ComponentA } from './component-a.component';
import { ComponentB } from './component-b.component';

const routes: Routes = [
  { path: 'component-a/:data', component: ComponentA },
  { path: 'component-b/:data', component: ComponentB }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

import { Component, OnInit } from '@angular/core';
import { ActivatedRoute } from '@angular/router';

@Component({
  selector: 'app-component-a',
  template: `
    <h1>Component A</h1>
    <p>{{ data }}</p>
  `
})
export class ComponentA implements OnInit {
  data: string;

  constructor(private route: ActivatedRoute) { }

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

import { Component, OnInit } from '@angular/core';
import { ActivatedRoute } from '@angular/router';

@Component({
  selector: 'app-component-b',
  template: `
    <h1>Component B</h1>
    <p>{{ data }}</p>
  `
})
export class ComponentB implements OnInit {
  data: string;

  constructor(private route: ActivatedRoute) { }

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