{
   [a: 1, b: null, c: '', d: undefined, e: 5],
   [a: 2, b: 3, c: '', d: null, e: 5],
   [a: 5, b: 4, c: '', d: null, e: 5]
}

<a class="btn btn-default btn-xs" ng-csv="exportToCsv()" lazy-load="true" csv-header="['a', 'b', 'c', 'd', 'e']" filename = "exported_data.csv"><i class="glyphicon glyphicon-download"></i></a></span>