在Javascript中每隔X分钟生成一次数组（作为字符串）

I'm trying to create an array of times (strings, not Date objects) for every X minutes throughout a full 24 hours. For example, for a 5 minute interval the array would be:

我试图在整个24小时内每隔X分钟创建一个时间数组（字符串，而不是Date对象）。例如，对于5分钟的间隔，阵列将是：

['12:00 AM', '12:05 AM', '12:10 AM', '12:15 AM', ..., '11:55 PM']

My quick and dirty solution was to use 3 nested for loops:

我的快速而肮脏的解决方案是使用3个嵌套for循环：

var times = []
  , periods = ['AM', 'PM']
  , hours = [12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]
  , prop = null
  , hour = null
  , min = null; 

for (prop in periods) {
  for (hour in hours) {
    for (min = 0; min < 60; min += 5) {
      times.push(('0' + hours[hour]).slice(-2) + ':' + ('0' + min).slice(-2) + " " + periods[prop]);
    }
  }
}

This outputs the desired result but I'm wondering if there's a more elegant solution. Is there a way to do this thats:

这会输出所需的结果，但我想知道是否有更优雅的解决方案。有没有办法做到这一点：

• more readable
• 更具可读性
• less time complex
• 减少时间复杂

10 个解决方案

#1

If the interval is only to be set in minutes[0-60], then evaluate the below solution w/o creating the date object and in single loop:

如果间隔仅以分钟[0-60]设置，则评估以下解决方案，无需创建日期对象并在单循环中：

var x = 5; //minutes interval
var times = []; // time array
var tt = 0; // start time
var ap = ['AM', 'PM']; // AM-PM

//loop to increment the time and push results in array
for (var i=0;tt<24*60; i++) {
  var hh = Math.floor(tt/60); // getting hours of day in 0-24 format
  var mm = (tt%60); // getting minutes of the hour in 0-55 format
  times[i] = ("0" + (hh % 12)).slice(-2) + ':' + ("0" + mm).slice(-2) + ap[Math.floor(hh/12)]; // pushing data in array in [00:00 - 12:00 AM/PM format]
  tt = tt + x;
}

#2

Allocating the resulting array to avoid the overhead of push, parameter validation and locale specifics notwithstanding:

分配结果数组以避免推送，参数验证和区域设置细节的开销，尽管如此：

function generate_series(step) {
    var dt = new Date(1970, 0, 1, 0, 0, 0, 0),
        rc = [];
    while (dt.getDate() == 1) {
        rc.push(dt.toLocaleTimeString('en-US'));
        dt.setMinutes(dt.getMinutes() + step);
    }
    return rc;
}

Here's a fiddle https://jsfiddle.net/m1ruw1x6/35/

这是一个小提琴https://jsfiddle.net/m1ruw1x6/35/

#3

You need only one loop, follow this approach

你只需要一个循环，遵循这种方法

var d = new Date(); //get a date object
d.setHours(0,0,0,0); //reassign it to today's midnight

Now keep adding 5 minutes till the d.getDate() value changes

现在继续添加5分钟直到d.getDate（）值更改

var date = d.getDate();
var timeArr = [];
while ( date == d.getDate() )
{
   var hours = d.getHours();
   var minutes = d.getMinutes();
   hours = hours == 0 ? 12: hours; //if it is 0, then make it 12
   var ampm = "am";
   ampm = hours > 12 ? "pm": "am";
   hours = hours > 12 ? hours - 12: hours; //if more than 12, reduce 12 and set am/pm flag
   hours = ( "0" + hours ).slice(-2); //pad with 0
   minute = ( "0" + d.getMinutes() ).slice(-2); //pad with 0
   timeArr.push( hours + ":" + minute + " " + ampm );
   d.setMinutes( d.getMinutes() + 5); //increment by 5 minutes
}

Demo

演示

#4

The following is massively flexible with the help of Moment.js.

在Moment.js的帮助下，以下内容非常灵活。

This code uses

此代码使用

• moment.duration
• moment.duration
• moment.add
• moment.add

There's no error handling, so you can pass in stupid parameters, but it gets the point across. :-D

没有错误处理，所以你可以传入愚蠢的参数，但它得到了重点。 :-D

The desiredStartTime parameter takes a time in hh:mm format.

desiredStartTime参数需要hh：mm格式的时间。

The period parameter accepts any of the moment.duration inputs.

period参数接受任何moment.duration输入。

const timelineLabels = (desiredStartTime, interval, period) => {
  const periodsInADay = moment.duration(1, 'day').as(period);

  const timeLabels = [];
  const startTimeMoment = moment(desiredStartTime, 'hh:mm');
  for (let i = 0; i <= periodsInADay; i += interval) {
    startTimeMoment.add(i === 0 ? 0 : interval, period);
    timeLabels.push(startTimeMoment.format('hh:mm A'));
  }

  return timeLabels;
};

/* A few examples */
const theDiv = document.getElementById("times");
let content;

content = JSON.stringify(timelineLabels('18:00', 2, 'hours'))
theDiv.appendChild(document.createTextNode(content));
theDiv.appendChild(document.createElement("p"));

content = JSON.stringify(timelineLabels('06:00', 30, 'm'))
theDiv.appendChild(document.createTextNode(content));
theDiv.appendChild(document.createElement("p"));

content = JSON.stringify(timelineLabels('00:00', 5, 'minutes'))
theDiv.appendChild(document.createTextNode(content));
theDiv.appendChild(document.createElement("p"));

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.js"></script>

<div id="times"></div>

#5

You could use a single for loop, while loop , Array.prototype.map(), Array.prototype.concat() , String.prototype.replace()

你可以使用单个for循环，while循环，Array.prototype.map（），Array.prototype.concat（），String.prototype.replace（）

var n = 0,
  min = 5,
  periods = [" AM", " PM"],
  times = [],
  hours = [12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];

for (var i = 0; i < hours.length; i++) {
  times.push(hours[i] + ":" + n + n + periods[0]);
  while (n < 60 - min) {
    times.push(hours[i] + ":" + ((n += 5) < 10 ? "O" + n : n) + periods[0])
  }
  n = 0;
}

times = times.concat(times.slice(0).map(function(time) {
  return time.replace(periods[0], periods[1])
}));

console.log(times)

#6

Manipulating with a date as with integer and using single loop:

使用整数和使用单循环操作日期：

var interval = 5 * 60 * 1000; //5 minutes 
var period = 24 * 60 * 60 * 1000; //dat period

//just converts any time to desired string
var toString = function toString(time){  
  var h = time.getHours();
  var m = time.getMinutes();
  var p = h >= 12 ? "PM" : "AM";
  h = h || 12;
  h = h > 12 ? h - 12 : h;  
  return ("0" + h).slice(-2) + ":" + ("0" + m).slice(-2) + " " + p;
}

//start time
var time = new Date(2010, 0, 1);

//resulting array
var times = [];

for ( var t = +time; t < +time + period; t += interval){  
  var d = toString(new Date(t));  
  times.push(d);
}

#7

In any case you need to do O(N) operations to enumerate array elements. However, you could iterate through Date objects itself.

在任何情况下，您都需要执行O（N）操作来枚举数组元素。但是，您可以迭代Date对象本身。

function timeArr(interval) //required function with custom MINUTES interval
{
  var result = [];
  var start = new Date(1,1,1,0,0);
  var end = new Date(1,1,2,0,0);
  for (var d = start; d < end; d.setMinutes(d.getMinutes() + 5)) {
      result.push(format(d));
  }

  return result;
}

function format(inputDate) // auxiliary function to format Date object
{
    var hours = inputDate.getHours();
    var minutes = inputDate.getMinutes();
    var ampm = hours < 12? "AM" : (hours=hours%12,"PM");
    hours = hours == 0? 12 : hours < 10? ("0" + hours) : hours;
    minutes = minutes < 10 ? ("0" + minutes) : minutes;
    return hours + ":" + minutes + " " + ampm;
}

Demo

演示

#8

Loops are unnecessary in this case.

在这种情况下，循环是不必要的。

ES6

//Array.from, only supported by Chrome 45+, Firefox 32+, Edge and Safari 9.0+
//create an array of the expected interval
let arr = Array.from({
  length: 24 * 60 / 5
}, (v, i) => {
  let h = Math.floor(i * 5 / 60);
  let m = i * 5 - h * 60;
  //convert to 12 hours time
  //pad zero to minute
  if (m < 10) {
    m = '0' + m;
  }
  let label = 'AM';
  if (h > 12) {
    label = 'PM';
    h -= 12;
  }
  if (h === 0) {
    h = 12;
  }
  return h + ':' + m + ' ' + label;
});

document.body.textContent = JSON.stringify(arr);

Wider browser support

var arr = Array.apply(null, {
  length: 24 * 60 / 5
}).map(function(v, i) {
  var h = Math.floor(i * 5 / 60);
  var m = i * 5 - h * 60;
  if (m < 10) {
    m = '0' + m;
  }
  var label = 'AM';
  if (h > 12) {
    label = 'PM';
    h -= 12;
  }
  if (h === 0) {
    h = 12;
  }
  return h + ':' + m + ' ' + label;
});

document.body.textContent = JSON.stringify(arr);

#9

My solution with emphasize on readability. It first creates objects that represent correct times and then formats them to strings. JsFiddle https://jsfiddle.net/6qk60hxs/

我的解决方案强调可读性。它首先创建表示正确时间的对象，然后将它们格式化为字符串。 JsFiddle https://jsfiddle.net/6qk60hxs/

var periods = ['AM', 'PM'];
var hours = [12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
var minutes = ["00", "05", 10, 15, 20, 25, 30, 35, 40, 45, 50, 55];


timeObj = add([{}], "p", periods);
timeObj = add(timeObj, "h", hours);
timeObj = add(timeObj, "m", minutes);

times = []
for (t of timeObj) {
  times.push(t.h + ':' + t.m + ' ' + t.p);
}

console.log(times)

function add(tab, prop, val) {
  var result = [];
  for (t of tab) {
    for (v of val) {
      tc = _.clone(t);
      tc[prop] = v;
      result.push(tc);
    }
  }
  return result
}

#10

if you have access to moment, you can always do something like this:

如果您可以访问时刻，您可以随时执行以下操作：

const locale = 'en'; // or whatever you want...
const hours = [];

moment.locale(locale);  // optional - can remove if you are only dealing with one locale

for(let hour = 0; hour < 24; hour++) {
    hours.push(moment({ hour }).format('h:mm A'));
    hours.push(
        moment({
            hour,
            minute: 30
        }).format('h:mm A')
    );
}

the result is the following array:

结果是以下数组：

["12:00 AM", "12:30 AM", "1:00 AM", "1:30 AM", "2:00 AM", "2:30 AM", "3:00 AM", "3:30 AM", "4:00 AM", "4:30 AM", "5:00 AM", "5:30 AM", "6:00 AM", "6:30 AM", "7:00 AM", "7:30 AM", "8:00 AM", "8:30 AM", "9:00 AM", "9:30 AM", "10:00 AM", "10:30 AM", "11:00 AM", "11:30 AM", "12:00 PM", "12:30 PM", "1:00 PM", "1:30 PM", "2:00 PM", "2:30 PM", "3:00 PM", "3:30 PM", "4:00 PM", "4:30 PM", "5:00 PM", "5:30 PM", "6:00 PM", "6:30 PM", "7:00 PM", "7:30 PM", "8:00 PM", "8:30 PM", "9:00 PM", "9:30 PM", "10:00 PM", "10:30 PM", "11:00 PM", "11:30 PM"]