Momentjs和倒数计时器 [英] Momentjs and countdown timer

问题描述

我发现Momentjs库非常酷，但是我找不到关于如何完成一些简单任务的文档. 我正在尝试构建一个倒数计时器，我猜我应该使用duration对象，但是我不太了解(可能由于英语不是我的母语).无论如何，这就是我想要的:

I found the Momentjs library which is pretty cool, however I don't find the documentation to be very clear on how to achieve some simple tasks. I'm trying to build a countdown timer and I'm guessing I should use the duration object, but I don't quite understand how (maybe due to the fact that English isn't my first language). Anyways this is what I want:

var time = 7200;
var duration = moment.duration('seconds',time);

setInterval(function(){
  //show how many hours, minutes and secods are left
  $('.countdown').text(duration.format('h:mm:ss')); 
  //this doesn't work because there's no method format for the duration object.
},1000);

因此它应该每秒显示一次:

So everysecond it should display:

02:00:00

01:59:59

01:59:58

01:59:57

...

00:00:00

如何使用Momentjs库实现此结果? 谢谢！

How would I achieve this result with the Momentjs library? Thanks!

推荐答案

duration对象表示一个静态周期，并且不会随着时间的流逝而增加/减少.因此，如果要减少它，则必须自己进行操作，例如创建一种秒计数器或每次重新创建duration对象.这是第二个选项的代码:

duration object represents a static period, and it does not increase/decrease with the flow of time. So if you what to decrease it you have to do it yourself, for example creating a kind of a seconds counter or recreating duration object every time. Here is the code for the second option:

var time = 7200;
var duration = moment.duration(time * 1000, 'milliseconds');
var interval = 1000;

setInterval(function(){
  duration = moment.duration(duration.asMilliseconds() - interval, 'milliseconds');
  //show how many hours, minutes and seconds are left
  $('.countdown').text(moment(duration.asMilliseconds()).format('h:mm:ss'));
}, interval);

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