这是我使用 angularfire 2 进行文件上传过程的编码方式.

Here is the way that I coded using angularfire 2 for the file uploading process.

public selectedFile: FileList;
chooseFile(event) {
  this.selectedFile =  event.target.files;
}

uploadImage() {
  const file = this.selectedFile.item(0);
  const key = 'uploads/' + '/' + Math.floor(Math.random() * 1000000) + file.name;
  const upload = this.stroge.upload(key, file).then(() => {
    const ref = this.stroge.ref(key);
    const downloadURL = ref.getDownloadURL().subscribe(url => {
      this.Updateprofile(url);
    });   
  });
}