计算两个日期间的天数

            daysBetween(DateOne, DateTwo) {
                var OneMonth = DateOne.substring(5, DateOne.lastIndexOf(\'-\'));
                var OneDay = DateOne.substring(DateOne.length, DateOne.lastIndexOf(\'-\') + 1);
                var OneYear = DateOne.substring(0, DateOne.indexOf(\'-\'));

                var TwoMonth = DateTwo.substring(5, DateTwo.lastIndexOf(\'-\'));
                var TwoDay = DateTwo.substring(DateTwo.length, DateTwo.lastIndexOf(\'-\') + 1);
                var TwoYear = DateTwo.substring(0, DateTwo.indexOf(\'-\'));

                var cha = ((Date.parse(OneMonth + \'/\' + OneDay + \'/\' + OneYear) - Date.parse(TwoMonth + \'/\' + TwoDay + \'/\' +
                    TwoYear)) / 86400000);
                return Math.abs(cha);
            },