//求两个日期之间的相差天数

        function 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 cha; //.abs(cha);求绝对值

        }