如何在元素的FormArray中设置值

import { Component, OnInit } from '@angular/core';
import { FormGroup, FormBuilder, FormArray } from '@angular/forms';

@Component({
  selector: 'app-example',
  templateUrl: './example.component.html',
  styleUrls: ['./example.component.css']
})
export class ExampleComponent implements OnInit {
  formGroup: FormGroup;

  constructor(private formBuilder: FormBuilder) { }

  ngOnInit() {
    this.formGroup = this.formBuilder.group({
      formArrayName: this.formBuilder.array([])
    });

    // 添加两个元素到FormArray
    const formArray = this.formGroup.get('formArrayName') as FormArray;
    formArray.push(this.formBuilder.control(''));
    formArray.push(this.formBuilder.control(''));

    // 设置第一个元素的值为"example"
    const control = formArray.at(0);
    control.setValue('example');
  }
}