Moment.js moment().weeksInYear()用法及代碼示例

moment().weeksInYear()方法用於返回Moment對象當前年份的周數。此方法是特定於區域設置的，因此該數字可能會根據 Moment 的當前區域設置而有所不同。

用法:

moment().weeksInYear();

參數：該方法不接受任何參數。

返回值：此方法返回 Moment 對象當前年份的周數。

注意：這在普通的 Node.js 程序中不起作用，因為它需要全局安裝或在項目目錄中安裝外部moment.js 庫。

Moment.js 可以使用以下命令安裝：

moment模塊的安裝：

npm install moment

以下示例將演示 Moment.js moment().weeksInYear() 方法。

示例 1：

const moment = require('moment'); 
  
console.log("Current Date:", moment().toString()) 
console.log("Current year is:", moment().year()) 
  
let year2050 = moment().year(2050); 
console.log( 
    "Weeks in Year 2050 is:", 
    year2050.weeksInYear() 
) 
  
let year1950 = moment().year(1950); 
console.log( 
    "Weeks in Year 1950 is:", 
    year1950.weeksInYear() 
)

輸出：

Current Date: Mon Jul 11 2022 02:14:41 GMT+0530
Current year is: 2022
Weeks in Year 2050 is: 53
Weeks in Year 1950 is: 52

示例 2：

const moment = require('moment'); 
  
console.log("Current Date:", moment().toString()) 
console.log("Current year is:", moment().year()) 
  
for (let i = 2000; i < 2030; i++) { 
    console.log( 
        `Weeks in Year ${i} is: ${moment().year(i).weeksInYear()}` 
    ) 
}

輸出：

Weeks in Year 2000 is: 53
Weeks in Year 2001 is: 52
Weeks in Year 2002 is: 52
Weeks in Year 2003 is: 52
Weeks in Year 2004 is: 52
Weeks in Year 2005 is: 53
Weeks in Year 2006 is: 52
Weeks in Year 2007 is: 52
Weeks in Year 2008 is: 52
Weeks in Year 2009 is: 52
Weeks in Year 2010 is: 52
Weeks in Year 2011 is: 53
Weeks in Year 2012 is: 52
Weeks in Year 2013 is: 52
Weeks in Year 2014 is: 52
Weeks in Year 2015 is: 52
Weeks in Year 2016 is: 53
Weeks in Year 2017 is: 52
Weeks in Year 2018 is: 52
Weeks in Year 2019 is: 52
Weeks in Year 2020 is: 52
Weeks in Year 2021 is: 52
Weeks in Year 2022 is: 53
Weeks in Year 2023 is: 52
Weeks in Year 2024 is: 52
Weeks in Year 2025 is: 52
Weeks in Year 2026 is: 52
Weeks in Year 2027 is: 52
Weeks in Year 2028 is: 53
Weeks in Year 2029 is: 52

參考：https://momentjs.com/docs/#/get-set/weeks-in-year/