比较两次范围 JavaScript

Question

我想比较两次并将结果显示为布尔值。我为此创建了一个函数。这是工作。但是当比较“AM”和“PM”时输出是错误的。

let Time = "11:25 PM";
let currentTime = "10:00 AM";

console.log(isFutureTime(currentTime, Time));
//Output should be true or false

  function isFutureTime(currentTime, checkTime) {
    if (checkTime.split(" ")[1] == currentTime.split(" ")[1]) {
      if (parseInt(currentTime.split(":")[0]) < parseInt(checkTime.split(":")[0])) {
        return true;
      }
      else if (parseInt(currentTime.split(":")[0]) == parseInt(checkTime.split(":")[0])) {
        if (parseInt(currentTime.split(":")[1].substring(0, 2)) <= parseInt(checkTime.split(":")[1])) {
          return true;
        } else {
          return false;
        }
      } else {
        return false;
      }
    }
    else {
      return false;
    }
  }

Answer 1

您需要检查 currentTime 是上午还是下午，return true 如果是下午。

...
return currentTime.split(" ")[1] === 'PM';
...

因为您已经检查了两次是否相等，所以您不需要检查 checkTime。

你为 currentTime.split(" ")[1] 声明一个变量以提高效率。

let Time = "11:25 PM";
let currentTime = "10:00 AM";

console.log(isFutureTime(currentTime, Time));
//Output should be true or false

function isFutureTime(currentTime, checkTime) {
  if (checkTime.split(" ")[1] == currentTime.split(" ")[1]) {
    if (parseInt(currentTime.split(":")[0]) < parseInt(checkTime.split(":")[0])) {
      return true;
    } else if (parseInt(currentTime.split(":")[0]) == parseInt(checkTime.split(":")[0])) {
      if (parseInt(currentTime.split(":")[1].substring(0, 2)) <= parseInt(checkTime.split(":")[1])) {
        return true;
      } else {
        return false;
      }
    } else {
      return false;
    }
  } else {
    return currentTime.split(" ")[1] === 'PM';
  }
}

Answer 2

或者，Javascript Date 可以本地解析您正在使用的时间格式。所以，我只需要连接一个日期字符串并为这两个值构造一个 Date 实例。然后比较一下。

function isFutureTime(currentTime, checkTime) {
  let date = new Date()
  date = `${date.getFullYear()}-${date.getMonth() + 1}-${date.getDate()}`

  return new Date(`${date} ${currentTime}`) > new Date(`${date} ${checkTime}`)
}

const currentTime = '10:00 AM';
const futureTime = '11:25 PM';
const pastTime = '03:15 AM';

console.log(futureTime, '=', isFutureTime(currentTime, futureTime))
console.log(pastTime, '=', isFutureTime(currentTime, pastTime))

比较两次范围 JavaScript

Compare two times range JavaScript

javascript

time

datetime

node.js