阿西河

所有教程

公众号
🌙
阿西河前端的公众号

我的收藏

    最近访问  (文章)

      教程列表

      抓包专区
      测试专区

      JS BigInt.toLocaleString()

      The toLocaleString() method returns a string with a language-sensitive representation of this BigInt.

      The source for this interactive example is stored in a GitHub repository. If you’d like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

      Syntax

      bigIntObj.toLocaleString([locales [, options]])
      

      Parameters

      The locales and options arguments customize the behavior of the function and let applications specify the language whose formatting conventions should be used. In implementations that ignore the locales and options arguments, the locale used and the form of the string returned are entirely implementation-dependent.

      locales Optional

      A string with a BCP 47 language tag, or an array of such strings. For the general form and interpretation of the locales argument, see the Intl page. The following Unicode extension key is allowed:

      nu

      The numbering system to be used. Possible values include: "arab", "arabext", "bali", "beng", "deva", "fullwide", "gujr", "guru", "hanidec", "khmr", "knda", "laoo", "latn", "limb", "mlym", "mong", "mymr", "orya", "tamldec", "telu", "thai", "tibt".

      options Optional

      An object with some or all of the following properties:

      localeMatcher

      The locale matching algorithm to use. Possible values are "lookup" and "best fit"; the default is "best fit". For information about this option, see the Intl page.

      style

      The formatting style to use. Possible values are "decimal" for plain number formatting, "currency" for currency formatting, and "percent" for percent formatting; the default is "decimal".

      currency

      The currency to use in currency formatting. Possible values are the ISO 4217 currency codes, such as "USD" for the US dollar, "EUR" for the euro, or "CNY" for the Chinese RMB — see the Current currency & funds code list. There is no default value; if the style is "currency", the currency property must be provided.

      currencyDisplay

      How to display the currency in currency formatting. Possible values are "symbol" to use a localized currency symbol such as €, "code" to use the ISO currency code, "name" to use a localized currency name such as "dollar"; the default is "symbol".

      useGrouping

      Whether to use grouping separators, such as thousands separators or thousand/lakh/crore separators. Possible values are true and false; the default is true.

      The following properties fall into two groups: minimumIntegerDigits, minimumFractionDigits, and maximumFractionDigits in one group, minimumSignificantDigits and maximumSignificantDigits in the other. If at least one property from the second group is defined, then the first group is ignored.

      minimumIntegerDigits

      The minimum number of integer digits to use. Possible values are from 1 to 21; the default is 1.

      minimumFractionDigits

      The minimum number of fraction digits to use. Possible values are from 0 to 20; the default for plain number and percent formatting is 0; the default for currency formatting is the number of minor unit digits provided by the ISO 4217 currency code list (2 if the list doesn’t provide that information).

      maximumFractionDigits

      The maximum number of fraction digits to use. Possible values are from 0 to 20; the default for plain number formatting is the larger of minimumFractionDigits and 3; the default for currency formatting is the larger of minimumFractionDigits and the number of minor unit digits provided by the ISO 4217 currency code list (2 if the list doesn’t provide that information); the default for percent formatting is the larger of minimumFractionDigits and 0.

      minimumSignificantDigits

      The minimum number of significant digits to use. Possible values are from 1 to 21; the default is 1.

      maximumSignificantDigits

      The maximum number of significant digits to use. Possible values are from 1 to 21; the default is 21.

      Return value

      A string with a language-sensitive representation of the given BigInt.

      Examples

      Using toLocaleString

      In basic use without specifying a locale, a formatted string in the default locale and with default options is returned.

      var bigint = 3500n;
      
      bigint.toLocaleString();
      // Displays "3,500" if in U.S. English locale
      
      

      Using locales

      This example shows some of the variations in localized number formats. In order to get the format of the language used in the user interface of your application, make sure to specify that language (and possibly some fallback languages) using the locales argument:

      var bigint = 123456789123456789n;
      
      // German uses period for thousands
      console.log(bigint.toLocaleString('de-DE'));
      // → 123.456.789.123.456.789
      
      // Arabic in most Arabic speaking countries uses Eastern Arabic digits
      console.log(bigint.toLocaleString('ar-EG'));
      // → ١٢٣٬٤٥٦٬٧٨٩٬١٢٣٬٤٥٦٬٧٨٩
      
      // India uses thousands/lakh/crore separators
      console.log(bigint.toLocaleString('en-IN'));
      // → 1,23,45,67,89,12,34,56,789
      
      // the nu extension key requests a numbering system, e.g. Chinese decimal
      console.log(bigint.toLocaleString('zh-Hans-CN-u-nu-hanidec'));
      // → 一二三,四五六,七八九,一二三,四五六,七八九
      
      // when requesting a language that may not be supported, such as
      // Balinese, include a fallback language, in this case Indonesian
      console.log(bigint.toLocaleString(['ban', 'id']));
      // → 123.456.789.123.456.789
      
      

      Using options

      The results provided by toLocaleString can be customized using the options argument:

      var bigint = 123456789123456789n;
      
      // request a currency format
      console.log(bigint.toLocaleString('de-DE', { style: 'currency', currency: 'EUR' }));
      // → 123.456.789.123.456.789,00 €
      
      // the Japanese yen doesn't use a minor unit
      console.log(bigint.toLocaleString('ja-JP', { style: 'currency', currency: 'JPY' }))
      // → ¥123,456,789,123,456,789
      
      // limit to three significant digits
      console.log(bigint.toLocaleString('en-IN', { maximumSignificantDigits: 3 }));
      // → 1,23,00,00,00,00,00,00,000
      
      

      Performance

      When formatting large numbers of numbers, it is better to create a NumberFormat object and use the function provided by its NumberFormat.format property.

      Specifications

      SpecificationStatus
      BigIntStage 3

      See also

      目录
      目录