问对输入中的数字进行舍入，但在模型中保留完整的十进制值

EN

<div ng-controller="Ctrl">{{dollar | number:2}}</div>

var app = angular.module("MyApp",[]);

app.filter("rounded",function(){    
    return function(val,to){
        return val.toFixed(to || 0);
    }
});

function Ctrl($scope){
    $scope.dollar=2046.3339228485938;
}

<div ng-controller="Ctrl">{{ dollar | rounded:2 }}</div>

.directive('inputCurrency', function ($filter, $locale) {
    return {
        terminal: true,
        restrict: 'A',        
        require: '?ngModel',
        link: function (scope, element, attrs, ngModel) {

            if (!ngModel)
                return; // do nothing if no ng-model

            // get the number format
            var formats = $locale.NUMBER_FORMATS;

            // fix up the incoming number to make sure it will parse into a number correctly
            var fixNumber = function (number) {
                if (number) {
                    if (typeof number !== 'number') {
                        number = number.replace(',', '');
                        number = parseFloat(number);
                    }
                }
                return number;
            }

            // function to do the rounding
            var roundMe = function (number) {
                number = fixNumber(number);
                if (number) {
                    return $filter('number')(number, 2);
                }
            }

            // Listen for change events to enable binding
            element.bind('blur', function () {                                
                element.val(roundMe(ngModel.$modelValue));
            });          

            // push a formatter so the model knows how to render
            ngModel.$formatters.push(function (value) {
                if (value) {
                    return roundMe(value);
                }
            });

            // push a parser to remove any special rendering and make sure the inputted number is rounded
            ngModel.$parsers.push(function (value) {
                return value;
            });
        }
    };
});