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  $scope.listDir = function (){

    var path = cordova.file.externalCacheDirectory;

    window.resolveLocalFileSystemURL(path,
      function (fileSystem) {
        var reader = fileSystem.createReader();
        reader.readEntries(
          function (entries) {
            //console.log(entries);
            $scope.JsonVal = entries;
          },
          function (err) {
            //console.log(err);
            $scope.JsonVal = err;
          }
        );
      }, function (err) {
        //console.log(err);
        $scope.JsonVal = err;
      }
    );
  }