Николай

var promise = $http.get('data/category.json');
promise
.then(
    function(data){
        $scope.category = data
    }, 
    function(error) {
        console.log(error);
    }
);

promise.then(function1).then(function2).then(function3)

link: function postLink(scope, element, attrs, ctrl) {
    var ngModel = ctrl;
        element.bind('blur', function () {
             // здесь можно получить параметры из ngModel через методы ngModelController
        });
      }

while (Boolean(--n) === true) {
     console.log(n);
}

var def = {
      handlers: [],
      when : function (func) {
        console.log ('start async');
        func.call(def, def.done);
        waiter();
        function waiter() {
          setTimeout (function () {
            if (def.result) {
              def.resolve(def.result);
            }
            else {
              waiter();
            }
          }, 500);
        }
        

          return def;
      },
      
      resolve: function(result) {
        console.log('start resolving');
        var _result = result;
        def.handlers.forEach(function(handler) {
          _result = handler(result);
        });
        def.result = _result;
      },
      then : function (func) {
        def.handlers.push(func);
        return def;
      },
      
      done : function (result) {
        def.result = result;
      }
      
    };

'libs/jquery/dist/jquery.js',
'libs/jquery/dist/jquery.min.js',