Ionic2 在ionic 2中上载时重命名图像文件

我在网上偶然发现了这个功能

private createFileName() {
      var d = new Date(),
      n = d.getTime(),
      newFileName =  n + ".jpg";
      return newFileName;
    }

它的用途是重命名图像文件。我的问题是

这是否仅将图像上载限制为

jpg

，还是将其转换为

jpg

如果是前者，我如何在上传之前获得图像扩展 然后像这样修改

private createFileName（ext）

函数，以便上传 每种图像类型

如果有帮助，这里是完整的代码

lastImage: string = null;
  loading: Loading;

public takePicture(sourceType) {
  // Create options for the Camera Dialog
  var options = {
    quality: 100,
    sourceType: sourceType,
    saveToPhotoAlbum: false,
    correctOrientation: true
  };

  // Get the data of an image
  this.camera.getPicture(options).then((imagePath) => {
    // Special handling for Android library
    if (this.platform.is('android') && sourceType === this.camera.PictureSourceType.PHOTOLIBRARY) {
      this.filePath.resolveNativePath(imagePath)
        .then(filePath => {
          let correctPath = filePath.substr(0, filePath.lastIndexOf('/') + 1);
          let currentName = imagePath.substring(imagePath.lastIndexOf('/') + 1, imagePath.lastIndexOf('?'));
          this.copyFileToLocalDir(correctPath, currentName, this.createFileName());
        });
    } else {
      var currentName = imagePath.substr(imagePath.lastIndexOf('/') + 1);
      var correctPath = imagePath.substr(0, imagePath.lastIndexOf('/') + 1);
      this.copyFileToLocalDir(correctPath, currentName, this.createFileName());
    }
  }, (err) => {
    this.presentToast('Error while selecting image.');
  });
}

   private copyFileToLocalDir(namePath, currentName, newFileName) {
  this.file.copyFile(namePath, currentName, cordova.file.dataDirectory, newFileName).then(success => {
    this.lastImage = newFileName;
  }, error => {
    this.presentToast('Error while storing file.');
  });
}


private presentToast(text) {
  let toast = this.toastCtrl.create({
    message: text,
    duration: 3000,
    position: 'top'
  });
  toast.present();
}

// Always get the accurate path to your apps folder
public pathForImage(img) {
  if (img === null) {
    return '';
  } else {
    return cordova.file.dataDirectory + img;
  }
}

public uploadImage() {
  // Destination URL
  var url = "http://my_url/uploads.php";

  // File for Upload
  var targetPath = this.pathForImage(this.lastImage);

  // File name only
  var filename = this.lastImage;

  var options = {
    fileKey: "file",
    fileName: filename,
    chunkedMode: false,
    mimeType: "multipart/form-data",
    params : {'fileName': filename}
  };

  const fileTransfer: TransferObject = this.transfer.create();

  this.loading = this.loadingCtrl.create({
    content: 'Uploading...',
  });
  this.loading.present();

  // Use the FileTransfer to upload the image
  fileTransfer.upload(targetPath, url, options).then(data => {
    this.loading.dismissAll()
    this.presentToast('Image succesfully uploaded.');
  }, err => {
    this.loading.dismissAll()
    this.presentToast('Error while uploading file.');
  });
}

1-它不限于“jpg”，也不转换为“jpg”，正如方法名所说：创建文件名，它创建一个字符串，文件名就是这个字符串。

2-图像扩展名将为jpg，因为它是默认的相机编码类型，并且看起来您正在使用相机拍照。您可以在照相机选项中更改编码类型。

您可以在中找到所有相机选项