如何计算总时间 [英] How do I calculate a total time

问题描述

我正在开发一个基于Web的应用程序，以捕获视频播放列表的总时间.我的主要问题是我不知道如何从数组中计算总时间，例如:30:00 + 30:00 = 01:00.时间以mm:ss为单位，我需要以hh:mm

I am developing a web-based application to capture total time of playlist of video. my main problem is that I don't know how can I calculate the total time from an array e.g: 30:00 + 30:00 = 01:00. Time is in mm:ss output I need in hh:mm

var time = ["13:24", "4:28", "7:29"];

for (k in time){
    add(time[k].split(":"));
}

推荐答案

您可以做什么的示例.

// assuming num will always be positive
function zeroPad(num) {
  var str = String(num);
  if (str.length < 2) {
    return '0' + str;
  }

  return str;
}

// assuming your time strings will always be (H*:)(m{0,2}:)s{0,2} and never negative
function totalTimeString(timeStrings) {
  var totals = timeStrings.reduce(function (a, timeString) {
    var parts = timeString.split(':');
    var temp;
    if (parts.length > 0) {
      temp = Number(parts.pop()) + a.seconds;
      a.seconds = temp % 60;
      if (parts.length > 0) {
        temp = (Number(parts.pop()) + a.minutes) + ((temp - a.seconds) / 60);
        a.minutes = temp % 60;
        a.hours = a.hours + ((temp - a.minutes) / 60);
        if (parts.length > 0) {
          a.hours += Number(parts.pop());
        }
      }
    }

    return a;
  }, {
    hours: 0,
    minutes: 0,
    seconds: 0
  });

  // returned string will be HH(H+):mm:ss
  return [
    zeroPad(totals.hours),
    zeroPad(totals.minutes),
    zeroPad(totals.seconds)
  ].join(':');
}

var result1 = totalTimeString([
  '13:24',
  '4:28',
  '7:29'
]);

console.log(result1);

var result2 = totalTimeString([
  '13:24:06',
  '4:28:46',
  '17:29:11'
]);

console.log(result2);

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