angular js文件下载存在文件名空格问题

app.controller('DownloadController', function($scope, $http) {
  $scope.downloadFile = function() {
    var fileName = 'example file name with spaces.pdf';
    var encodedFileName = encodeURIComponent(fileName);
    var downloadUrl = 'http://example.com/download?file=' + encodedFileName;

    $http.get(downloadUrl, { responseType: 'arraybuffer' })
      .then(function(response) {
        var blob = new Blob([response.data], { type: 'application/pdf' });
        var objectUrl = URL.createObjectURL(blob);
        var a = document.createElement('a');
        a.href = objectUrl;
        a.download = fileName;
        a.click();
        URL.revokeObjectURL(objectUrl);
      });
  };
});