如何在Javascript中找到当前语言环境的小数点分隔符 [英] How do I find the decimal separator for current locale in Javascript

问题描述

在我的应用程序中，有几个地方需要用户输入货币值.该应用程序支持以多种货币以及本地化存储这些货币值.

In my application there are several places where the user is expected to enter a monetary value. The application supports storing these monetary values in multiple currencies as well as localization.

我正在使用 Intl.NumberFormat Javascript中的对象可以将数字格式化为我需要的任何货币和语言环境，但是无法使用该数字对数字进行格式化.

I'm using the Intl.NumberFormat object in Javascript to format a number into any currency and locale I need, but there's no way to unformat the number using that.

到目前为止，我发现的所有库都要求您提供小数和千位分隔符，以便格式化/取消格式化功能起作用.但是，我需要一种方法来首先查找小数和千位分隔符，以便不能使用它们.

All of the libraries I've found so far require you to provide the decimal and thousands separators in order for the formatting/unformatting functions to work. However, I need a way to find what the decimal and thousands separators are in the first place so I can't use those.

如何可靠地获取当前语言环境的小数点分隔符?

How can I reliably get the decimal separator for the current locale?

推荐答案

选项1:使用 Intl.NumberFormat#formatToParts

最可靠的方法，仅适用于支持Intl API的浏览器.否则，它需要国际polyfill

Most reliable method, only works for browsers supporting the Intl API. Otherwise it requires an Intl polyfill

function getDecimalSeparator(locale) {
    const numberWithDecimalSeparator = 1.1;
    return Intl.NumberFormat(locale)
        .formatToParts(numberWithDecimalSeparator)
        .find(part => part.type === 'decimal')
        .value;
}

选项2:使用 toLocaleString

不太优雅，它依赖于一个分隔符总是一个字符长的事实，所有语言似乎都是这样:小数点分隔符-维基百科

Less elegant, it relies on the fact that a separator is always one character long, which seems to be the case for all languages: Decimal separator - Wikipedia

function getDecimalSeparator(locale) {
    const numberWithDecimalSeparator = 1.1;

    return numberWithDecimalSeparator
        .toLocaleString(locale)
        .substring(1, 2);
}

这已在此处建议: 示例:

> getDecimalSeparator()
"."
> getDecimalSeparator('fr-FR')
","

选项1的奖励:

我们可以扩展它以检索给定语言环境的十进制或 group 分隔符:

We could extend it to retrieve either the decimal or group separator of a given locale:

function getSeparator(locale, separatorType) {
        const numberWithGroupAndDecimalSeparator = 1000.1;
        return Intl.NumberFormat(locale)
            .formatToParts(numberWithGroupAndDecimalSeparator)
            .find(part => part.type === separatorType)
            .value;
    }

示例:

> getSeparator('en-US', 'decimal')
"."
> getSeparator('en-US', 'group')
","
> getSeparator('fr-FR', 'decimal')
","
> getSeparator('fr-FR', 'group')
" "

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