问如何在工厂服务和特定控制器的$scope值之间设置数据绑定？

EN

.controller('FirstController', function($scope, SharedFactory) {
  $scope.variable = SharedFactory.getVal();
})

.controller('SecondController', function($scope, SharedFactory) {
  $scope.variable = SharedFactory.getVal();
  SharedFactory.setVal("test string 2");
})

.factory("SharedFactory", function () {
    var data = {                // all variables by default
        variable : 'test string'
    };
    return {
        getVal: function () {
            return data.variable
        },
        setVal: function (i) {
            data.variable = i;
        }
    }
});