在JavaScript中将类似倒计时的日期格式转换为毫秒

const re = /(?:(\d+)y)?(?:(\d+)m)?(?:(\d+)d)?(?:(\d+)h)?(?:(\d+)m)?(?:(\d+)s)?/;
const toSeconds = input => {
  const [, years, months, days, hours, minutes, seconds] = input.match(re);
  // console.log({years, months, days, hours, minutes, seconds})
  const totalDays = ((years || 0) * 365)
    + ((months || 0) * 30)
    + (days || 0);
  const totalSeconds = totalDays * 24 * 3600
    + ((hours || 0)*3600)
    + ((minutes || 0) * 60)
    + (seconds || 0)
  return totalSeconds * 1000;
};
`1d23h10m
0d12h0m
12h0m
0m0s
0m10s
10s`.split('\n').forEach(str => console.log(toSeconds(str)));

function parseTime(s) {
  var tokens = {d:8.64e7, h:3.6e6, m:6e4, s:1e3};
  var buff = '';
  return s.split('').reduce(function (ms, c) {
    c in tokens? (ms += buff * tokens[c]) && (buff = '') : buff += c;
    return ms;
  }, 0);
}
  
// Examples
['1d23h10m','0d12h0m','12h0m','0m0s','0m10s','10s','1d1s'].forEach(function(s) {
  console.log(s + ' => ' + parseTime(s));
});