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I had the same problem and spend many hours find different solutions for AngularJS code,
You can do something like this using Blob.
<a download="content.txt" ng-href="{{ url }}">download</a>
in your controller:
var content = 'file content for example';
var blob = new Blob([ content ], { type : 'text/plain' });
$scope.url = (window.URL || window.webkitURL).createObjectURL( blob );
in order to enable the URL:
app = angular.module(...);
app.config(['$compileProvider',
function ($compileProvider) {
$compileProvider.aHrefSanitizationWhitelist(/^\s*(https?|ftp|mailto|tel|file|blob):/);
}]);