如何使用Intl获取工作日名称？

Question

我想在我的i18n-ed应用程序中显示7个工作日的列表:

Sunday, Monday, Tuesday... Saturday

我靠上国际全局对象格式化的日期/时间,但我无法找到一个简单的方法来获得唯一的工作日名称.

我想我可以在EPOCH时间增加一些时间,以达到一周的第一天,但​​我没有在工作日找到格式化器打印.

var date = new Date(0);
date.setDate(4 + day);
for (var i = 0; i < 7; i++) {
  var weekday = new Intl.DateTimeFormat(["en"], {
      weekday: "short" // ?? what should I put here
  }).format(date);
  console.log(weekday);
}

输出:

Sunday, January 4, 1970
Monday, January 5, 1970
Tuesday, January 6, 1970
Wednesday, January 7, 1970
Thursday, January 8, 1970
Friday, January 9, 1970
Saturday, January 10, 1970

期望的输出:

Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday

我也希望有一个较短版本的日子,比如Sun, Mon, Tue....

或者,有没有办法从工作日字符串Intl？我试图通过控制台探索对象,但我找不到它们.

Answer 1

我在 2021 年使用 es6 的解决方案

\n

\r\n

\r\n

/**\n * Return list of days\n *  localeName : name of local, f.e. en-GB, default es-MX\n * \xe2\x9c\x85 weekday    : format of weekday short/long (Default)\n */\nfunction daysForLocale(localeName = \'es-MX\', weekday = \'long\') {\n  const {format} = new Intl.DateTimeFormat(localeName, { weekday });\n  return [...Array(7).keys()]\n    .map((day) => format(new Date(Date.UTC(2021, 5, day))));\n}\n\n// ##############################################################\n// testing daysForLocale function\n// ##############################################################\nconsole.log(daysForLocale());\n// [\'domingo\',\'lunes\',...,\'viernes\',\'s\xc3\xa1bado\']\nconsole.log(daysForLocale(\'en-GB\', \'short\'));\n// [\'Sun\', \'Mon\', \'Tue\', \'Wed\', \'Thu\', \'Fri\',\'Sat\']\nconsole.log(daysForLocale(\'ja-JP\', \'short\'));\n// [\'\xe6\x97\xa5\', \'\xe6\x9c\x88\', \'\xe7\x81\xab\',\'\xe6\xb0\xb4\', \'\xe6\x9c\xa8\', \'\xe9\x87\x91\',\'\xe5\x9c\x9f\']

\r\n

\r\n

\r\n

\n

Answer 2

我被误导了,因为我使用的是Intl polyfill,它还不支持{ weekday: "short" }.

使用本机Intl实现按预期工作.

Answer 3

 const weekdayDateMap = {
  Mon: new Date('2020-01-06T00:00:00.000Z'),
  Tue: new Date('2020-01-07T00:00:00.000Z'),
  Wed: new Date('2020-01-08T00:00:00.000Z'),
  Thu: new Date('2020-01-09T00:00:00.000Z'),
  Fri: new Date('2020-01-10T00:00:00.000Z'),
  Sat: new Date('2020-01-11T00:00:00.000Z'),
  Sun: new Date('2020-01-12T00:00:00.000Z'),
};
const shortWeekdays = Object.keys(weekdayDateMap);

const getDayOfWeek = (shortName, locale = 'en-US', length = 'short') =>
  new Intl.DateTimeFormat(locale, { weekday: length }).format(weekdayDateMap[shortName]);

const getDaysOfWeek = (locale = 'en-US', length = 'short') =>
  shortWeekdays.map(shortName => getDayOfWeek(shortName, locale, length));


console.log(getDayOfWeek('Mon', 'de-DE')) // "Mo"

console.log(getDaysOfWeek('de-DE')) // ["Mo", "Di", "Mi", "Do", "Fr", "Sa", "So"]

笔记：

如果您Intl.DateTimeFormat每秒多次调用格式化程序，则创建一次格式化程序并重新使用它会更有效。