如何在ionic中将base64图像转换为blob

ionic cordova plugin add cordova-plugin-camera
npm install @ionic-native/camera

import { Camera, CameraOptions } from '@ionic-native/camera/ngx';

constructor(private camera: Camera) { }

convertBase64ToBlob(base64Data: string): Blob {
  const byteCharacters = atob(base64Data);
  const byteArrays = [];

  for (let offset = 0; offset < byteCharacters.length; offset += 512) {
    const slice = byteCharacters.slice(offset, offset + 512);

    const byteNumbers = new Array(slice.length);
    for (let i = 0; i < slice.length; i++) {
      byteNumbers[i] = slice.charCodeAt(i);
    }

    const byteArray = new Uint8Array(byteNumbers);
    byteArrays.push(byteArray);
  }

  return new Blob(byteArrays, { type: 'image/jpeg' });
}

takePicture() {
  const options: CameraOptions = {
    quality: 100,
    destinationType: this.camera.DestinationType.DATA_URL,
    encodingType: this.camera.EncodingType.JPEG,
    mediaType: this.camera.MediaType.PICTURE
  };

  this.camera.getPicture(options).then((imageData) => {
    const blobImage = this.convertBase64ToBlob(imageData);
    // 在这里可以使用blobImage进行后续操作，比如上传到服务器等
  }, (err) => {
    console.log(err);
  });
}