如何使用拖放功能在ionic 3中上传文件

<div id="dropzone" (drop)="onFileDrop($event)" (dragover)="onDragOver($event)">
  拖放文件到此处
</div>

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

@Component({
  selector: 'page-upload',
  templateUrl: 'upload.html',
})
export class UploadPage {

  onFileDrop(event: DragEvent) {
    event.preventDefault();
    const files = event.dataTransfer.files;
    // 处理上传文件的逻辑
  }

  onDragOver(event: DragEvent) {
    event.preventDefault();
  }

}