Moment.js moment().weeksInYear() 方法

moment().weeksInYear() 方法 用于返回Moment对象的当前年份中一共有多少周。该方法与所使用的语言环境相关，因此结果可能因Moment对象的当前语言环境而异。

语法:

moment().weeksInYear();

参数:

此方法不接受任何参数。

返回值:

此方法返回 Moment 对象当前年份的周数。

注意:

此方法在普通的 Node.js 程序中不起作用，因为它需要全局安装或在项目目录中安装一个外部 moment.js 库。

可以使用以下命令安装 Moment.js：

安装 moment 模块:

npm install moment

以下示例将演示 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() 
)

输出：

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()}` 
    ) 
}

输出：

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

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