我们的应用程序是由ionic framework angular file saver插件开发的，该插件在所有浏览器中都运行良好，但在构建windows桌面应用程序后无法运行，我想将文件保存在下载目录中，而blob文件需要保存。

downloadDocument(document_uuid,fileName){
let req={
  "order_uuid":this.order_uuid,
  "document_uuid":document_uuid
};
this.documentLoader=true;
this.documentData="d-none";
this.userService.DownloadDocument(req).subscribe((data:any)=>{
  console.log(data);
  this.documentLoader=false;
  this.documentData="";
  if(data.statusCode==200){
    var downloadBase64=data['data']['documentDataBase64'];
    console.log("base 64 conversion",downloadBase64);
    var contentType = "";
    var type=(fileName).split('.');
    var fileType=type[1];
    switch(fileType){
      case "xls":
        contentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        break;
      case "xlsx":
        contentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        break;
      case "doc":
        contentType="application/msword";
        break;
      case "docx":
        contentType="application/vnd.openxmlformats-officedocument.wordprocessingml.document";
        break;
      case "odt":
        contentType="application/vnd.oasis.opendocument.text";
        break;
      case "txt":
        contentType="text/plain";
        break;
      case "zip":
        contentType="application/zip";
        break;
      case "rtf":
        contentType="application/rtf";
        break;
      case "rar":
        contentType="application/vnd.rar";
        break;
      case "pdf":
        contentType="application/pdf";
        break;
      case "csv":
        contentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        break;
      case "jpeg":
        contentType="image/jpeg";
        break;
      case "png":
        contentType="image/png";
        break;
      case "gif":
        contentType="image/gif";
        break;
    }
    const byteArray = new Uint8Array(atob(downloadBase64).split('').map(char => char.charCodeAt(0)));
    let blob = new Blob([byteArray], {type:contentType});
    const url = window.URL.createObjectURL(blob);
    let filename = data['data']['file_name'];
    FileSaver.saveAs(blob,filename);
  }
})

}
但在生成windows桌面应用程序后未保存文件。