用 on('propertychange input') 试试

jquery

https://github.com/flaviosilveira/Jquery-Price-Format

angularjs

app.directive('price', function () {
    return {
        restrict: 'A',
        require: 'ngModel',
        link: function (scope, element, attr, ngModel) {
            function parse(string) {
                var v = parseFloat(string) || 0;
                return parseInt(v * 100);
            }

            function format(string) {
                var v = parseInt(string) || 0;
                return parseFloat(v / 100).toFixed(2);
            }
            ngModel.$parsers.push(parse);
            ngModel.$formatters.push(format);
        }
    };
});