js 计算两日期 天数 小时 分钟 秒数

  function StringToDate(string) {            return new Date(Date.parse(string.replace(/-/g, "/")));} function countTimeLength(interval, date1, date2) {            var objInterval = {'D' : 1000 * 60 * 60 * 24, 'H' : 1000 * 60 * 60, 'M' : 1000 * 60, 'S' : 1000, 'T' : 1};            interval = interval.toUpperCase();            var dt1 = Date.parse(StringToDate(date1));            alert(dt1);            var dt2 = Date.parse(StringToDate(date2));            try {                return ((dt2 - dt1) / (objInterval[interval]));            }            catch (e) {                return e.message;            }}