上传文件时如何通过ng2- file -upload发送附加参数

import { Component } from '@angular/core';
import { FileUploader } from 'ng2-file-upload';

@Component({
  selector: 'app-file-upload',
  template: `
    <input type="file" (change)="onFileSelected($event.target.files)">
    <button (click)="uploadFile()">Upload</button>
  `
})
export class FileUploadComponent {
  uploader: FileUploader;
  additionalParams: any = {};

  constructor() {
    this.uploader = new FileUploader({
      url: 'https://example.com/upload',
      itemAlias: 'file'
    });
  }

  onFileSelected(files: FileList) {
    this.uploader.clearQueue(); // 清空之前选择的文件
    this.uploader.addToQueue(Array.from(files)); // 将新选择的文件添加到队列中
  }

  uploadFile() {
    // 添加附加参数到FormData
    const formData = new FormData();
    Object.keys(this.additionalParams).forEach(key => {
      formData.append(key, this.additionalParams[key]);
    });

    // 将文件和参数一起发送
    this.uploader.setOptions({ additionalParameter: formData });

    this.uploader.uploadAll();
  }
}