Проблема в том, что вы используете «learningApp», но вы не включаете javascript, имеющий learningApp. При открытии страницы в Firefox, а затем проверить поджигатель вы получите следующее сообщение об ошибке, которая жалуется на не найти «learningApp»:
Error: [$injector:modulerr] http://errors.angularjs.org/1.2.26/$injector/modulerr?p0=learningApp&p1=%5B%24injector%3Anomod%5D%20http%3A%2F%2Ferrors.angularjs.org%2F1.2.26%2F%24injector%2Fnomod%3Fp0%3DlearningApp%0AC%2F%3C%40file%3A%2F%2F%2Fhome%2Fansumanb%2FDesktop%2Flogin_with_angular%2Fexisting%2Flib%2Fangular%2Fangular.min.js%3A6%3A443%0AZc%2Fb.module%3C%2F%3C%2Fb%5Be%5D%3C%40file%3A%2F%2F%2Fhome%2Fansumanb%2FDesktop%2Flogin_with_angular%2Fexisting%2Flib%2Fangular%2Fangular.min.js%3A21%3A1%0AZc%2Fb.module%3C%2F%3C%40file%3A%2F%2F%2Fhome%2Fansumanb%2FDesktop%2Flogin_with_angular%2Fexisting%2Flib%2Fangular%2Fangular.min.js%3A20%3A376%0Ae%2F%3C%40file%3A%2F%2F%2Fhome%2Fansumanb%2FDesktop%2Flogin_with_angular%2Fexisting%2Flib%2Fangular%2Fangular.min.js%3A33%3A265%0Ar%40file%3A%2F%2F%2Fhome%2Fansumanb%2FDesktop%2Flogin_with_angular%2Fexisting%2Flib%2Fangular%2Fangular.min.js%3A7%3A288%0Ae%40file%3A%2F%2F%2Fhome%2Fansumanb%2FDesktop%2Flogin_with_angular%2Fexisting%2Flib%2Fangular%2Fangular.min.js%3A33%3A207%0Agc%40file%3A%2F%2F%2Fhome%2Fansumanb%2FDesktop%2Flogin_with_angular%2Fexisting%2Flib%2Fangular%2Fangular.min.js%3A36%3A307%0Afc%2Fc%40file%3A%2F%2F%2Fhome%2Fansumanb%2FDesktop%2Flogin_with_angular%2Fexisting%2Flib%2Fangular%2Fangular.min.js%3A18%3A168%0Afc%40file%3A%2F%2F%2Fhome%2Fansumanb%2FDesktop%2Flogin_with_angular%2Fexisting%2Flib%2Fangular%2Fangular.min.js%3A18%3A380%0AXc%40file%3A%2F%2F%2Fhome%2Fansumanb%2FDesktop%2Flogin_with_angular%2Fexisting%2Flib%2Fangular%2Fangular.min.js%3A17%3A422%0A%40file%3A%2F%2F%2Fhome%2Fansumanb%2FDesktop%2Flogin_with_angular%2Fexisting%2Flib%2Fangular%2Fangular.min.js%3A215%3A30%0Aa%40file%3A%2F%2F%2Fhome%2Fansumanb%2FDesktop%2Flogin_with_angular%2Fexisting%2Flib%2Fangular%2Fangular.min.js%3A145%3A67%0Aoe%2Fc%2F%3C%40file%3A%2F%2F%2Fhome%2Fansumanb%2FDesktop%2Flogin_with_angular%2Fexisting%2Flib%2Fangular%2Fangular.min.js%3A31%3A223%0Ar%40file%3A%2F%2F%2Fhome%2Fansumanb%2FDesktop%2Flogin_with_angular%2Fexisting%2Flib%2Fangular%2Fangular.min.js%3A7%3A288%0Aoe%2Fc%40file%3A%2F%2F%2Fhome%2Fansumanb%2FDesktop%2Flogin_with_angular%2Fexisting%2Flib%2Fangular%2Fangular.min.js%3A31%3A207%0A
...N.stringify(arguments[c]):arguments[c]);return Error(a)}}function Pa(b){if(null=...
Просто удалите learningApp, как вы не в том числе один, он будет работать. (DEMO)
<!doctype html>
<html ng-app>
<body>
I can add: {{ 1+2 }}.
<script src="angular.min.js"></script>
</body>
</html>
Или же вы можете создать app.js и включить JS. (DEMO)
<!doctype html>
<html ng-app="learningApp">
<body>
I can add: {{ 1+2 }}.
<script src="angular.min.js"></script>
<script src="app.js"></script>
</body>
</html>
ли следующий app.js
angular.module('learningApp', []);
Великого ответ! Благодаря! – malcoauri