Moment.js moment.duration().subtract()方法

moment().duration().subtract() 方法用于从持续时间中减去给定的时间。要减去的时间可以是另一个持续时间对象、毫秒值或使用字符串和数字值表示的时间。在此处可以使用用于创建持续时间的所有速记和键。

语法：

moment().duration().subtract(Number)
moment().duration().subtract(Duration)
moment().duration().subtract(Object)
moment().duration().subtract(Number, String)

参数： 该方法接受一个参数，表示要减去的时间。可用的格式包括：

• Number： 这将是表示要减去的时间的毫秒数。
• Duration： 这表示要减去的另一个持续时间对象。
• Object： 这表示要减去的时间作为一个对象。
• Number, String： 这表示要减去的时间，使用数字值和其类型的字符串值表示。

返回值： 它返回修改过的持续时间对象。

注意： 这在普通的Node.js程序中不起作用，因为它需要全局安装或项目目录中安装外部的moment.js库。

可以通过以下命令安装moment.js：

moment模块的安装：

npm install moment

示例1： 以下示例将演示Moment.js moment.duration().subtract() 方法。

const moment = require('moment'); 
  
// Example 1 
  
let durationOne = moment.duration(4, 'years'); 
console.log( 
    "Data of durationOne before subtracting:", 
    durationOne._data 
) 
console.log( 
    "Humanized Data of durationOne before subtracting:", 
    durationOne.humanize() 
) 
  
// Subtracting using subtract(Number, String) 
durationOne.subtract(24, 'months'); 
console.log( 
    "Data of durationOne after subtracting:", 
    durationOne._data 
) 
console.log( 
    "Humanized Data of durationOne after subtracting:", 
    durationOne.humanize() 
) 
  
let durationTwo = moment.duration(130, 'seconds'); 
console.log( 
    "Data of durationTwo before subtracting:", 
    durationTwo._data 
) 
console.log( 
    "Humanized Data of durationTwo before subtracting:", 
    durationTwo.humanize() 
) 
  
// Subtracting using subtract(Number) 
durationTwo.subtract(50000); 
console.log( 
    "Data of durationTwo after subtracting:", 
    durationTwo._data 
) 
console.log( 
    "Humanized Data of durationTwo after subtracting:", 
    durationTwo.humanize() 
)

运行应用程序的步骤： 在终端中输入以下命令来运行index.js文件:

node index.js

输出：

Data of durationOne before subtracting: {
  milliseconds: 0,
  seconds: 0,
  minutes: 0,
  hours: 0,
  days: 0,
  months: 0,
  years: 4
}
Humanized Data of durationOne before subtracting: 4 years
Data of durationOne after subtracting: {
  milliseconds: 0,
  seconds: 0,
  minutes: 0,
  hours: 0,
  days: 0,
  months: 0,
  years: 2
}
Humanized Data of durationOne after subtracting: 2 years 
Data of durationTwo before subtracting: {
  milliseconds: 0,
  seconds: 10,
  minutes: 2,
  hours: 0,
  days: 0,
  months: 0,
  years: 0
}
Humanized Data of durationTwo before subtracting: 2 minutes
Data of durationTwo after subtracting: {
  milliseconds: 0,
  seconds: 20,
  minutes: 1,
  hours: 0,
  days: 0,
  months: 0,
  years: 0
}
Humanized Data of durationTwo after subtracting: a minute

示例2：

const moment = require('moment'); 
  
let durationThree = moment.duration(15, 'hours'); 
console.log( 
    "Data of durationThree before subtracting:", 
    durationThree._data 
) 
console.log( 
    "Humanized Data of durationThree before subtracting:", 
    durationThree.humanize() 
) 
  
// Subtracting using subtract(Duration) 
let durationTosubtract = moment.duration(72, 'minutes'); 
  
durationThree.subtract(durationTosubtract); 
console.log( 
    "Data of durationThree after subtracting:", 
    durationThree._data 
) 
console.log( 
    "Humanized Data of durationThree after subtracting:", 
    durationThree.humanize() 
) 
  
let durationFour = moment.duration(4, 'hours'); 
console.log( 
    "Data of durationFour before subtracting:", 
    durationFour._data 
) 
console.log( 
    "Humanized Data of durationFour before subtracting:", 
    durationFour.humanize() 
) 
  
// Subtracting using subtract(Object) 
let durationTosubtractAgain = moment.duration( 
    { minutes: 120, seconds: 30 } 
); 
  
durationFour.subtract(durationTosubtractAgain); 
console.log( 
    "Data of durationFour after subtracting:", 
    durationFour._data 
) 
console.log( 
    "Humanized Data of durationFour after subtracting:", 
    durationFour.humanize() 
)

输出：

Data of durationThree before subtracting: {
  milliseconds: 0,
  seconds: 0,
  minutes: 0,
  hours: 15,
  days: 0,
  months: 0,
  years: 0
}
Humanized Data of durationThree before subtracting: 15 hours
Data of durationThree after subtracting: {
  milliseconds: 0,
  seconds: 0,
  minutes: 48,
  hours: 13,
  days: 0,
  months: 0,
  years: 0
}
Humanized Data of durationThree after subtracting: 14 hours
Data of durationFour before subtracting: {
  milliseconds: 0,
  seconds: 0,
  minutes: 0,
  hours: 4,
  days: 0,
  months: 0,
  years: 0
}
Humanized Data of durationFour before subtracting: 4 hours
Data of durationFour after subtracting: {
  milliseconds: 0,
  seconds: 30,
  minutes: 59,
  hours: 1,
  days: 0,
  months: 0,
  years: 0
}
Humanized Data of durationFour after subtracting: 2 hours

参考： https://momentjs.com/docs/#/durations/subtract/