Angular:根据select输入获取json文件的第二个值

import { HttpClientModule } from '@angular/common/http';

@NgModule({
  imports: [
    // ...
    HttpClientModule
  ],
  // ...
})
export class AppModule { }

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class DataService {
  constructor(private http: HttpClient) {}

  getData(): Observable<any> {
    return this.http.get('path/to/your/data.json');
  }
}

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

@Component({
  selector: 'app-root',
  template: `
    <select (change)="onChange($event)">
      <option *ngFor="let item of data" [value]="item">{{ item.name }}</option>
    </select>
    <p>第二个值: {{ secondValue }}</p>
  `
})
export class AppComponent implements OnInit {
  data: any[] = [];
  secondValue: any;

  constructor(private dataService: DataService) {}

  ngOnInit() {
    this.dataService.getData().subscribe((response: any[]) => {
      this.data = response;
      if (this.data.length > 1) {
        this.secondValue = this.data[1]; // 获取第二个值
      }
    });
  }

  onChange(event: any) {
    const selectedIndex = event.target.selectedIndex;
    if (selectedIndex > 0) {
      this.secondValue = this.data[selectedIndex - 1];
    }
  }
}