javascript：评估如果给定的小时是在两个小时之间

问题描述

所以有很多关于如何计算两个日期之间的时间的例子。

So there's plenty of examples on how to calculate the time between two dates.

但在我的例子中，我有一个日期X.假设今天是。
X有时间关联它，例如08:00（或者我从 .getHours（））中获得回复

But in my case, I have a date X. Let's say it's today.X has a time associate to it, e.g. 08:00 (Or what I get back from .getHours())

我需要知道，如果 X 的小时在开始时间（例如07:00）和结束时间之间（说12:00）

I need to know if the hours of X are between a start hour (say "07:00") and an end hour (say "12:00")

X将始终通过 getHours（）
检索范围的开始和结束时间具有固定格式（例如07:00和12:00 ）

X will be always retrieved via getHours()The start and end hour of the range have a fixed format (e.g. "07:00" and "12:00")

性能是一个问题，所以任何性能更好是首选（例如，如果它暗示使用时刻，没关系，但是如果一个自定义函数的表现会更好，那么我们就想要这样做）

Performance is an issue, so whatever performs better is preferred (e.g. if it implies using moment, that's fine, but if a custom function would perform better, we want that)

我的第一个方法是将格式修改为 .getHours（）到一个数字，同样的范围小时，然后计算...我觉得这种方法我有麻烦的一些特殊情况我可能不知道？

My first approach would be, as the formats are fixed, to transform the .getHours() to a number, likewise for the range hours, and then calculate...I feel this approach my have trouble with some special cases I may not be aware of?

推荐答案

如果您想要查看部分时间，请考虑将小时转换为分钟，如下所示。你将如何处理午夜过后的范围？例如23:30至01:30。

If you want to check part hours, consider converting the hours to minutes, something like the following. How will you deal with ranges that go over midnight? e.g. 23:30 to 01:30.

/*  Determine if the current time is between two provided hours
**  @param {string} h0 - time in format h:mm
**  @param {string} h1 - time in format h:mm
**  @returns {boolean} true if the current time is between or equal to h0 and h1
*/
function betweenHours(h0, h1) {
  var now = new Date();
  var mins = now.getHours()*60 + now.getMinutes();
  return toMins(h0) <= mins && mins <= toMins(h1);
}

/*  Convert hours to minutes
**  @param {string} h - time in format h:mm
**  @returns {number} time converted to minutes
*/
function toMins(h) {
  var b = h.split(':')
  return b[0]*60 + +b[1];
}

 

<form>
  Start time (h:mm)<input name="startHours">
  <br>
  End time (h:mm)<input name="endHours">
  <br>
  <button type="button" onclick="
   this.form.inRange.value = betweenHours(this.form.startHours.value, this.form.endHours.value);
   ">Check range</button>
  <br>
  Currently in range? <input name="inRange" readonly>
</form>
                 

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