修改此方法，使其应用于表单组中除最后一项之外的所有项。Angular 7反应形式。没有jquery或ngModel

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

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

  constructor(private formBuilder: FormBuilder) { }

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

  get formArray(): FormArray {
    return this.formGroup.get('formArray') as FormArray;
  }

  addItem() {
    this.formArray.push(this.formBuilder.control(''));
  }

  removeItem(index: number) {
    this.formArray.removeAt(index);
  }

  submitForm() {
    // 处理表单提交逻辑
  }
}

<form [formGroup]="formGroup" (ngSubmit)="submitForm()">
  <div formArrayName="formArray">
    <div *ngFor="let control of formArray.controls; let i = index">
      <input [formControlName]="i" *ngIf="i !== formArray.length - 1">
    </div>
  </div>
  <button type="button" (click)="addItem()">添加项</button>
  <button type="submit">提交</button>
</form>