当我调用此函数时出现此错误：

 if (event.keyCode == 46 || event.keyCode == 8 || event.keyCode == 9 || event.keyCode == 27 || event.keyCode == 13 ||
 ReferenceError: event is not defined 

这是我的代码：

 $(".decimalonly").each(function () {
                    $(this).keydown(function (e) {


                        if (event.keyCode == 46 || event.keyCode == 8 || event.keyCode == 9 || event.keyCode == 27 || event.keyCode == 13 ||

                                    (event.keyCode == 65 && event.ctrlKey === true) ||
                                    ((event.keyCode == 190 || event.keyCode == 110) && $(this).val().indexOf(".") == -1) ||

                                    (event.keyCode >= 35 && event.keyCode <= 39)) {

                            return;
                        }
                        else {
                            keypress
                            if (event.shiftKey || (event.keyCode < 48 || event.keyCode > 57) && (event.keyCode < 96 || event.keyCode > 105)) {
                                event.preventDefault();
                            }
                        }
                    });
                });