Moment.js moment().weekday(Number) 方法

moment().weekday() 方法 用于获取或设置Moment对象的星期几。它是区域感知的，因此根据周的第一天是星期日还是星期一，值可能会有所不同。当超过星期范围时，它将设置下一周或上一周的星期几。

语法:

moment().weekday( Number );

参数： 该方法接受一个参数，如上所述，并在下面进行描述：

Number： 这是要设置为Moment对象的工作日。这是一个可选参数。

返回值： 该方法返回Moment的当前工作日。

注意： 在普通Node.js程序中将无法运行，因为它需要全局安装或在项目目录中安装外部的moment.js库。

Moment.js可以使用以下命令进行安装：

安装moment模块：

npm install moment

下面的示例将演示 Moment.js moment().weekday() 方法 。

示例1：

const moment = require('moment'); 
  
console.log( 
    "Current Date:", moment().toString() 
) 
console.log( 
    "Current weekday is:", moment().weekday() 
) 
  
let thisWeekTuesday = moment().weekday(2); 
console.log( 
    "This week's Tuesday is:", 
    thisWeekTuesday.toString() 
) 
  
let thisWeekFriday = moment().weekday(5); 
console.log( 
    "This week's Friday is:", 
    thisWeekFriday.toString() 
) 
  
let thisWeekSunday = moment().weekday(7); 
console.log( 
    "This week's Sunday is:", 
    thisWeekSunday.toString() 
)

输出：

Current Date: Mon Jul 11 2022 01:30:15 GMT+0530
Current weekday is: 1
This week's Tuesday is: Tue Jul 12 2022 01:30:15 GMT+0530
This week's Friday is: Fri Jul 15 2022 01:30:15 GMT+0530
This week's Sunday is: Sun Jul 17 2022 01:30:15 GMT+0530

示例2：

const moment = require('moment'); 
  
console.log( 
    "Current Date:", moment().toString() 
) 
console.log( 
    "Current weekday is:", moment().weekday() 
) 
  
// Next week is 7 (full week) + 2 (for tuesday) = 9 
let nextWeekTuesday = moment().weekday(9); 
console.log( 
    "Next week's Tuesday is:", 
    nextWeekTuesday.toString() 
) 
  
// Previous week is 2 (for tuesday) - 7 (full week) = -5 
let prevWeekTuesday = moment().weekday(-5); 
console.log( 
    "Previous week's Tuesday is:", 
    prevWeekTuesday.toString() 
) 
  
// Next week is 7 (full week) + 7 (for sunday) = 14 
let nextWeekSunday = moment().weekday(14); 
console.log( 
    "Next week's Sunday is:", 
    nextWeekSunday.toString() 
)

输出：

Current Date: Mon Jul 11 2022 01:30:15 GMT+0530
Current weekday is: 1
Next week's Tuesday is: Tue Jul 19 2022 01:30:15 GMT+0530
Previous week's Tuesday is: Tue Jul 05 2022 01:30:15 GMT+0530
Next week's Sunday is: Sun Jul 24 2022 01:30:15 GMT+0530

参考： https://momentjs.com/docs/#/get-set/weekday/