javascript - Dayjs返回数字而不是带有`.form`的相对词

Question

dayjs ( ) 上有一个插件relativeTime，它将返回人类可读的字符串而不是数字。有没有办法只返回数字？

像这样的东西

dayjs('2020-07-1').from(dayjs('2020-07-9')) // -8
dayjs('2020-07-1').from(dayjs('2020-07-1')) // 0
dayjs('2020-07-11').from(dayjs('2020-07-9')) // 2 

Answer 1

工作代码！！

使用库中的diff()方法作为第二个参数dayjs'day'

console.log(dayjs('2020-07-1').diff('2020-07-9', 'day'));     // -8
console.log(dayjs('2020-07-1').diff('2020-07-1', 'day'));     // 0
console.log(dayjs('2020-07-11').diff('2020-07-9', 'day'));    // 2

<script src="https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.8.29/dayjs.min.js" integrity="sha512-APVsMirhHF2o3YdCSwYonM7egfT589pTqyoy5hIzEbs9sAGJSbEI6ssXUwngHjaq4V/GmmmpgqrcLSvsO+gsJQ==" crossorigin="anonymous"></script>

注意：'day'可以用'd' 代替，它是简写

Answer 2

如果没有dayjs我可以建议简单的方法来获得您想要的结果，如下所示。

function getDayDifference(from, to) {
  let diffInMilliseconds = new Date(from) - new Date(to);
  // divide with (1000*60*60*24) to get difference in days.
  let days = Math.round(diffInMilliseconds / (1000 * 60 * 60 * 24));
  console.log(days);
  return days;
}

getDayDifference('2020-07-1', '2020-07-9'); // -8
getDayDifference('2020-07-1', '2020-07-1'); // 0
getDayDifference('2020-07-11', '2020-07-9'); // 2

---

或者，您可以为dayjswith定义自己的扩展方法dayjs.prototype.getDayDifference = function(to) {...}。你可以在下面检查它。

dayjs.prototype.getDayDifference = function(to) {
  //86400000 = (1000 * 60 * 60 * 24)
  return Math.round((this.$d - to.$d) / 86400000);
}

console.log(dayjs('2020-07-1').getDayDifference(dayjs('2020-07-9'))); // -8
console.log(dayjs('2020-07-1').getDayDifference(dayjs('2020-07-1'))); // 0
console.log(dayjs('2020-07-11').getDayDifference(dayjs('2020-07-9'))); // 2

<script src="https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.8.29/dayjs.min.js" integrity="sha512-APVsMirhHF2o3YdCSwYonM7egfT589pTqyoy5hIzEbs9sAGJSbEI6ssXUwngHjaq4V/GmmmpgqrcLSvsO+gsJQ==" crossorigin="anonymous"></script>