Why is the wrong encoding saved in csv format?

Question

JSON

The question is the following, there is a collection of Clients and you need to backup it to a csv file. After subscribing and clicking, you should:

$scope.saveAll = function(){
      function JSON2CSV(objArray) {
        var array = typeof objArray != 'object' ? JSON.parse(objArray) : objArray;
        var str = '';
        var line = '';
        for (var i = 0; i < array.length; i++) {
          var line = '';
            for (var index in array[i]) {
              var value = array[i][index] + "";
              line += '"' + value.replace(/"/g, '""') + '",';
            }
          line = line.slice(0, -1);
          str += line + '\r\n';
        }
        return str;
      }
      var jsonObject = JSON.stringify($scope.clients);
      var csv = JSON2CSV(jsonObject);
      window.open(encodeURI('data:text/csv;charset=utf-8,' + csv));
      console.log(csv);
    }

In the console log, everything looks good: screen
After saving the file, open it and see: screen
Encoding is specified, but it does not pull it up and we get krakozyabry. Actually, how can I get what I want in the file? Thanks in advance.