我想在firebase中保存一个简单的帖子，但是我没有得到它的图像
现在，我的服务

uploadAndSave(item: any) {
   let post = { $key: item.key, title: item.title, description: item.description, url: '', fullPath: '' };

if(post.key) {
  this.save(post);
} else {
  let storageRef = this.fb.storage().ref();
  let basePath = `/posts/${new Date()}`;              // Path Where I want to save the image
  post.fullPath = basePath + '/' + post.title + '.png';
  
  let uploadTask = storageRef.child(post.fullPath).putString(post.fileToUpload, 'base64');
  console.log(uploadTask)
  this.db.list(`${this.PATH}/`).push(post);
  uploadTask.on(firebase.storage.TaskEvent.STATE_CHANGED,
  (snapshot) => {
    var progress = (snapshot.bytesTransferred / snapshot.totalBytes) * 100;
    console.log(progress + "% done");
  },
  (error) => {
    console.error(error);
  },
  () => {
    post.url = uploadTask.snapshot.downloadURL;
    this.save(post);
  });
}
}

    private save(post: any) {
    return new Promise((resolve, reject) => {
      if (post.key) {
        this.db.list(this.PATH)
          .update(post.key, { title: post.title, description: post.description, url: post.url, fullPath: post.fullPath })
          .then(() => resolve())
          .catch((e) => reject(e));
      console.log(post)
      } else {
        this.db.list(this.PATH)
          .push({ title: post.title, description: post.description, url: post.url, fullPath: post.fullPath })
          .then(() => resolve());
      }
    })
  }

这是我的看法与图像，标题和说明，我需要sabe所有这些数据，但有些是错误的

<img [src]="imageUrl" alt="" id="image-post">
<input type="file" accept="image/*" (change)="handleFileInput($event.target.files)">

       
<button type="submit" class="waves-effect teal lighten-1 btn" [disabled]="!form.valid" (click)="createPost()">CRIAR</button>
<a routerLink="/painel/postagens" class="waves-effect red darken-1 btn">CANCELAR</a>

现在这是我的组件

createPost() {
if(this.form.valid)
  this.service.uploadAndSave(this.form.value)
        .then(() => {
          swal("Postagem criada!", "Esta postagem foi inserido no Banco de Dados com sucesso!", "success");
        })
        .catch((e) => {
          swal("Não foi possível salvar a postagem!");
          console.error(e);
        });
   }


handleFileInput(file: FileList) {
     this.fileUpload = file.item(0);
if (this.fileUpload.type.match('image.*')) {
  var reader = new FileReader();
  reader.onload = (event:any) => {
    this.imageUrl = event.target.result;
  }
  reader.readAsDataURL(this.fileUpload);

   } else {
      swal('Tipo de arquivo não aceito!');
   }
 }

如果没有图像，我可以将数据保存在firebase中，但当我尝试使用图像保存时，它会出现错误，对不起，这么多代码是我不知道我在代码的哪一部分出错