javascript - JS 周、小时、天到秒……然后再回来

Question

我正在尝试将周数、天数和小时数转换为秒数，然后再将它们转换回来。

当我将它们转换回来时，日期和时间不正确:

var weeks = 3,
days = 5,
hours = 1;

//convert to seconds
sec_in_w = weeks * 604800,
sec_in_d = days * 86400,
secs_in_h = hours * 3600,
secs = sec_in_w + sec_in_d + secs_in_h;

//convert back to weeks, days, and hours 
new_w = Math.floor(secs / 604800);
secs -= new_w;
new_d = Math.floor(secs / 86400);
secs -= new_d;
new_h = Math.floor(secs / 3600);

console.log('weeks: ' + new_w);
console.log('days: ' + new_d);
console.log('hour: ' + new_h);

演示:

http://codepen.io/anon/pen/avZwBp

Answer 1

//convert back to weeks, days, and hours     
new_w = Math.floor(secs / 604800);
secs = secs % 604800;
new_d = Math.floor(secs / 86400);
secs = secs % 86400;
new_h = Math.floor(secs / 3600);

使用模数给出余数。