function dateDiff(date1, date2) {
            var type1 = typeof date1, type2 = typeof date2;
            if (type1 == 'string')
                date1 = stringToTime(date1);
            else if (date1.getTime)
                date1 = date1.getTime();
            if (type2 == 'string')
                date2 = stringToTime(date2);
            else if (date2.getTime)
                date2 = date2.getTime();
            //alert((date1 - date2) / (1000*60*60)); 
            return (date1 - date2) / (1000 * 60 * 60 * 24); //結果是小時 
        }
        //字串轉成Time(dateDiff)所需方法 
        function stringToTime(string) {
            var f = string.split(' ', 2);
            var d = (f[0] ? f[0] : '').split('-', 3);
            var t = (f[1] ? f[1] : '').split(':', 3);
            return (new Date(
           parseInt(d[0], 10) || null,
           (parseInt(d[1], 10) || 1) - 1,
            parseInt(d[2], 10) || null,
            parseInt(t[0], 10) || null,