其他答案中有很多不必要的地板。如果字符串以毫秒为单位,则转换为 h:m:s 如下:
function msToTime(s) {
var ms = s % 1000;
s = (s - ms) / 1000;
var secs = s % 60;
s = (s - secs) / 60;
var mins = s % 60;
var hrs = (s - mins) / 60;
return hrs + ':' + mins + ':' + secs + '.' + ms;
}
如果您希望将其格式化为 hh:mm:ss.sss 则使用:
function msToTime(s) {
// Pad to 2 or 3 digits, default is 2
function pad(n, z) {
z = z || 2;
return ('00' + n).slice(-z);
}
var ms = s % 1000;
s = (s - ms) / 1000;
var secs = s % 60;
s = (s - secs) / 60;
var mins = s % 60;
var hrs = (s - mins) / 60;
return pad(hrs) + ':' + pad(mins) + ':' + pad(secs) + '.' + pad(ms, 3);
}
console.log(msToTime(55018))
使用一些最近添加的语言特性,pad 功能可以更简洁:
function msToTime(s) {
// Pad to 2 or 3 digits, default is 2
var pad = (n, z = 2) => ('00' + n).slice(-z);
return pad(s/3.6e6|0) + ':' + pad((s%3.6e6)/6e4 | 0) + ':' + pad((s%6e4)/1000|0) + '.' + pad(s%1000, 3);
}
// Current hh:mm:ss.sss UTC
console.log(msToTime(new Date() % 8.64e7))