javascript 如何使用 Moment.js 获得以周为单位的持续时间？
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How to get duration in weeks with Moment.js?
提问by Michael
I use moment.jsto format durations in human readable format.
For example (dis a Dateobject):
我moment.js用来格式化人类可读格式的持续时间。
例如（d是一个Date对象）：
moment(d).subtract("days", 3).from(d) // returns "3 days ago"
Now I would like to get "2 weeks ago" but the code below returns the durations in days
现在我想得到“2周前”，但下面的代码以天为单位返回持续时间
moment(d).subtract("weeks", 2).from(d) // returns "14 days ago" i/o "2 weeks ago"
How can I get "2 weeks ago" with moment.js?
我怎样才能得到“2周前” moment.js？
回答by timrwood
You can do this pretty easily with a custom callback function.
您可以使用自定义回调函数轻松完成此操作。
moment.relativeTime.dd = function (number) {
// round to the closest number of weeks
var weeks = Math.round(number / 7);
if (number < 7) {
// if less than a week, use days
return number + " days";
} else {
// pluralize weeks
return weeks + " week" + (weeks === 1 ? "" : "s");
}
}
回答by Joshua Pinter
Use the new updateLocale().
使用新的updateLocale().
Moment.js has been updated again so the preferred methodis the following:
Moment.js 已再次更新，因此首选方法如下：
moment.updateLocale('en', {
relativeTime : {
future: 'in %s',
past: '%s ago',
s: 'a few seconds',
m: 'a minute',
mm: '%d minutes',
h: 'an hour',
hh: '%d hours',
d: 'a day',
dd: function(number) {
if (number < 7) {
return number + ' days'; // Moment uses "d" when it's just 1 day.
}
else {
var weeks = Math.round(number / 7);
return weeks + ' ' + (weeks > 1 ? 'weeks' : 'week');
}
},
M: 'a month',
MM: '%d months',
y: 'a year',
yy: '%d years'
}
});
Thanks to @timrwoodand @gahenfor their answers.
I'm in the works to get Moment updated so that you can override just a singlerelativeTimeobject, like dd, instead of having to provide all of the objects.
我正在努力更新 Moment，以便您可以仅覆盖单个relativeTime对象，例如dd，而不必提供所有对象。
The GitHub Issue is here, so give it a thumbs up if you'd like to do something like this instead:
GitHub 问题在这里，所以如果你想做这样的事情，请竖起大拇指：
moment.updateLocale('en', {
relativeTime : {
dd: function(number) {
if (number < 7) {
return number + ' days'; // Moment uses "d" when it's just 1 day.
}
else {
var weeks = Math.round(number / 7);
return weeks + ' ' + (weeks > 1 ? 'weeks' : 'week');
}
}
}
});
回答by gahen
I can't comment on the previous answer but I wanted to leave an updated answer (based on timrwood's)
我无法对之前的答案发表评论，但我想留下一个更新的答案（基于timrwood的）
moment.locale('en', {
relativeTime : {
future: "in %s",
past: "%s ago",
s: "seconds",
m: "a minute",
mm: "%d minutes",
h: "an hour",
hh: "%d hours",
d: "a day",
dd: function (number) {
var weeks = Math.round(number / 7);
if (number < 7) {
// if less than a week, use days
return number + " days";
} else {
// pluralize weeks
return weeks + " week" + (weeks === 1 ? "" : "s");
}
},
M: "a month",
MM: "%d months",
y: "a year",
yy: "%d years"
}
});
$window.moment.relativeTimeThreshold('d', 340); // if you want weeks instead of months, otherwise put a 28 or so.
回答by vinjenzo
sharing and hoping still useful:
分享并希望仍然有用：
var aPastDate = moment().subtract(5,'months');
var now = moment();
moment.fn.durationInWeeks = function (fromDate, toDate) {
var weeks = toDate.diff( fromDate, 'weeks' );
return weeks + ' weeks ago'; //your own format
}
moment().durationInWeeks(aPastDate,now);
//"21 weeks ago"
回答by Lars Kotthoff
The documentationlists the rules for creating those strings (under "Humanize time from another moment"). While you can modify the strings by changing moment.relativeTime, this is limited to the text that is displayed around the number, i.e. you can't change days to weeks.
该文档列出了创建这些字符串的规则（在“从另一个时刻将时间人性化”下）。虽然您可以通过更改来修改字符串moment.relativeTime，但这仅限于显示在数字周围的文本，即您不能将天更改为周。
You'll have to extend moment.jsor write some custom code to implement this functionality.
您必须扩展moment.js或编写一些自定义代码来实现此功能。
回答by cenk
improving on @vinjenzo's answer, when you need date diff in weeks, you will most likely encounter days returned:
改进@vinjenzo 的回答，当您需要几周内的日期差异时，您很可能会遇到返回的天数：
var aPastDate = moment().subtract(5,'months');
var aPastDay = moment().subtract(6,'days');
var now = moment();
moment.fn.durationInWeeks = function(fromDate, toDate) {
var days = toDate.diff(fromDate, 'days');
var weeks = toDate.diff(fromDate, 'weeks');
if (weeks === 0) {
return days + ' ' + (days > 1 ? 'days' : 'day');
} else {
return weeks + ' ' + (Math.round(days / 7) > 1 ? 'weeks' : 'week');
}
}
moment().durationInWeeks(aPastDate,now); // 21 weeks
moment().durationInWeeks(aPastDay,now); // 6 days
