使用 JavaScript 从 Date 对象或日期字符串中获取工作日 [英] Get the weekday from a Date object or date string using JavaScript

问题描述

我有一个 (yyyy-mm-dd) 格式的日期字符串，我如何从中获取工作日名称?

I have a date string in (yyyy-mm-dd) format, how can I get the weekday name from it?

示例:

• 对于字符串2013-07-31"，输出将是星期三"
• 对于使用 new Date() 的今天日期，输出将基于当前星期几

• For the string "2013-07-31", the output would be "Wednesday"
• For today's date using new Date(), the output would be based on the current day of week

推荐答案

使用这个函数，自带日期字符串验证:

如果您在项目中的某处包含此功能，

Use this function, comes with date string validation:

If you include this function somewhere in your project,

// Accepts a Date object or date string that is recognized by the Date.parse() method
function getDayOfWeek(date) {
  const dayOfWeek = new Date(date).getDay();    
  return isNaN(dayOfWeek) ? null : 
    ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'][dayOfWeek];
}

您可以像这样轻松地在任何地方使用它:

You will be able to use it anywhere easily like this:

getDayOfWeek( "2013-07-31" )
> "Wednesday"

getDayOfWeek( new Date() ) // or
getDayOfWeek( Date.now() )
> // (will return today's day. See demo jsfiddle below...)

如果使用了无效的日期字符串，将返回一个空值.

If invalid date string is used, a null will be returned.

getDayOfWeek( "~invalid string~" );
> null

有效日期字符串基于 日期.parse() 方法如 MDN JavaScript 参考中所述.

Valid date strings are based on the Date.parse() method as described in the MDN JavaScript reference.

演示: http://jsfiddle.net/samliew/fo1nnsgp/

当然，您也可以使用 moment.js 插件，特别是如果需要时区.

Of course you can also use the moment.js plugin, especially if timezones are required.

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