数字助手
提供将数字格式化为货币、百分比、电话号码等的方法。
类中的示例用法
class Topic
include ActiveSupport::NumberHelper
def price
number_to_currency(@price)
end
end
模块中的示例用法
require "active_support/number_helper"
module NumberFormatting
def format_price(price)
ActiveSupport::NumberHelper.number_to_currency(price)
end
end
- N
实例公共方法
number_to_currency(number, options = {}) 链接
将number
格式化为货币字符串。
number_to_currency(1234567890.50) # => "$1,234,567,890.50"
number_to_currency(1234567890.506) # => "$1,234,567,890.51"
number_to_currency("12x34") # => "$12x34"
number_to_currency(1234567890.50, unit: "£", separator: ",", delimiter: "")
# => "£1234567890,50"
除非通过选项另行指定,否则将使用当前语言环境的货币单位和数字格式。不执行货币转换。如果用户可以更改其语言环境,他们也可以使用此助手更改显示的货币的相对值。如果您的应用程序将来会支持多种语言环境,您可能需要指定一个常量:locale
选项,或者考虑使用能够进行货币转换的库。
选项
:locale
-
用于格式化的语言环境。默认为当前语言环境。
number_to_currency(1234567890.506, locale: :fr) # => "1 234 567 890,51 €"
:precision
-
精度级别。默认为 2。
number_to_currency(1234567890.123, precision: 3) # => "$1,234,567,890.123" number_to_currency(0.456789, precision: 0) # => "$0"
:round_mode
-
指定如何执行舍入。参见
BigDecimal.mode
。默认为:default
。number_to_currency(1234567890.01, precision: 0, round_mode: :up) # => "$1,234,567,891"
:unit
-
货币的面额。默认为
"$"
。 :separator
-
小数分隔符。默认为
"."
。 :delimiter
-
千位分隔符。默认为
","
。 :format
-
非负数的格式。
%u
表示货币,%n
表示数字。默认为"%u%n"
。number_to_currency(1234567890.50, format: "%n %u") # => "1,234,567,890.50 $"
:negative_format
-
负数的格式。
%u
和%n
的行为与:format
相同,但%n
表示数字的绝对值。默认为:format
的值,前面加上-
。number_to_currency(-1234567890.50, negative_format: "(%u%n)") # => "($1,234,567,890.50)"
:strip_insignificant_zeros
-
是否删除小数点后的不重要零。默认为 false。
number_to_currency(1234567890.50, strip_insignificant_zeros: true) # => "$1,234,567,890.5"
来源:显示 | 在 GitHub 上
# File activesupport/lib/active_support/number_helper.rb, line 161 def number_to_currency(number, options = {}) NumberToCurrencyConverter.convert(number, options) end
number_to_delimited(number, options = {}) 链接
通过用分隔符对千位分组来格式化number
。
number_to_delimited(12345678) # => "12,345,678"
number_to_delimited("123456") # => "123,456"
number_to_delimited(12345678.9876) # => "12,345,678.9876"
number_to_delimited("12x34") # => "12x34"
number_to_delimited(12345678.9876, delimiter: ".", separator: ",")
# => "12.345.678,9876"
选项
:locale
-
用于格式化的语言环境。默认为当前语言环境。
number_to_delimited(12345678.05, locale: :fr) # => "12 345 678,05"
:delimiter
-
千位分隔符。默认为
","
。number_to_delimited(12345678, delimiter: ".") # => "12.345.678"
:separator
-
小数分隔符。默认为
"."
。number_to_delimited(12345678.05, separator: " ") # => "12,345,678 05"
:delimiter_pattern
-
一个正则表达式,用于确定分隔符的位置。在使用像 INR 这样的货币格式时很有用。
number_to_delimited("123456.78", delimiter_pattern: /(\d+?)(?=(\d\d)+(\d)(?!\d))/) # => "1,23,456.78"
来源:显示 | 在 GitHub 上
# File activesupport/lib/active_support/number_helper.rb, line 264 def number_to_delimited(number, options = {}) NumberToDelimitedConverter.convert(number, options) end
number_to_human(number, options = {}) 链接
将number
格式化为更人性化的表示形式。对于可能变得非常大而难以阅读的数字很有用。
number_to_human(123) # => "123"
number_to_human(1234) # => "1.23 Thousand"
number_to_human(12345) # => "12.3 Thousand"
number_to_human(1234567) # => "1.23 Million"
number_to_human(1234567890) # => "1.23 Billion"
number_to_human(1234567890123) # => "1.23 Trillion"
number_to_human(1234567890123456) # => "1.23 Quadrillion"
number_to_human(1234567890123456789) # => "1230 Quadrillion"
如果要美化打印文件大小,请参见number_to_human_size
。
选项
:locale
-
用于格式化的语言环境。默认为当前语言环境。
:precision
-
精度级别。默认为 3。
number_to_human(123456, precision: 2) # => "120 Thousand" number_to_human(123456, precision: 4) # => "123.5 Thousand"
:round_mode
-
指定如何执行舍入。参见
BigDecimal.mode
。默认为:default
。number_to_human(123456, precision: 2, round_mode: :up) # => "130 Thousand"
:significant
-
:precision
是否应该应用于有效数字而不是小数位。默认为 true。 :separator
-
小数分隔符。默认为
"."
。number_to_human(123456, precision: 4, separator: ",") # => "123,5 Thousand"
:delimiter
-
千位分隔符。默认为
","
。 :strip_insignificant_zeros
-
是否删除小数点后的不重要零。默认为 true。
number_to_human(1000000) # => "1 Million" number_to_human(1000000, strip_insignificant_zeros: false) # => "1.00 Million" number_to_human(10.01) # => "10" number_to_human(10.01, strip_insignificant_zeros: false) # => "10.0"
:format
-
输出的格式。
%n
表示数字,%u
表示量词(例如,“千”)。默认为"%n %u"
。 :units
-
一个
Hash
,包含自定义单位量词名称。number_to_human(1, units: { unit: "m", thousand: "km" }) # => "1 m" number_to_human(100, units: { unit: "m", thousand: "km" }) # => "100 m" number_to_human(1000, units: { unit: "m", thousand: "km" }) # => "1 km" number_to_human(100000, units: { unit: "m", thousand: "km" }) # => "100 km" number_to_human(10000000, units: { unit: "m", thousand: "km" }) # => "10000 km"
以下键支持整数单位:
:unit
、:ten
、:hundred
、:thousand
、:million
、:billion
、:trillion
、:quadrillion
。此外,以下键支持小数单位::deci
、:centi
、:mili
、:micro
、:nano
、:pico
、:femto
。该
Hash
也可以在 I18n 语言环境中定义为一个作用域。例如en: distance: centi: one: "centimeter" other: "centimeters" unit: one: "meter" other: "meters" thousand: one: "kilometer" other: "kilometers"
然后可以按名称指定
number_to_human(1, units: :distance) # => "1 meter" number_to_human(100, units: :distance) # => "100 meters" number_to_human(1000, units: :distance) # => "1 kilometer" number_to_human(100000, units: :distance) # => "100 kilometers" number_to_human(10000000, units: :distance) # => "10000 kilometers" number_to_human(0.1, units: :distance) # => "10 centimeters" number_to_human(0.01, units: :distance) # => "1 centimeter"
来源:显示 | 在 GitHub 上
# File activesupport/lib/active_support/number_helper.rb, line 475 def number_to_human(number, options = {}) NumberToHumanConverter.convert(number, options) end
number_to_human_size(number, options = {}) 链接
将number
(以字节为单位)格式化为更人性化的表示形式。对于向用户报告文件大小很有用。
number_to_human_size(123) # => "123 Bytes"
number_to_human_size(1234) # => "1.21 KB"
number_to_human_size(12345) # => "12.1 KB"
number_to_human_size(1234567) # => "1.18 MB"
number_to_human_size(1234567890) # => "1.15 GB"
number_to_human_size(1234567890123) # => "1.12 TB"
number_to_human_size(1234567890123456) # => "1.1 PB"
number_to_human_size(1234567890123456789) # => "1.07 EB"
如果要美化打印普通数字,请参见number_to_human
。
选项
:locale
-
用于格式化的语言环境。默认为当前语言环境。
:precision
-
精度级别。默认为 3。
number_to_human_size(123456, precision: 2) # => "120 KB" number_to_human_size(1234567, precision: 2) # => "1.2 MB"
:round_mode
-
指定如何执行舍入。参见
BigDecimal.mode
。默认为:default
。number_to_human_size(123456, precision: 2, round_mode: :up) # => "130 KB"
:significant
-
:precision
是否应该应用于有效数字而不是小数位。默认为 true。 :separator
-
小数分隔符。默认为
"."
。number_to_human_size(1234567, separator: ",") # => "1,18 MB"
:delimiter
-
千位分隔符。默认为
","
。 :strip_insignificant_zeros
-
是否删除小数点后的不重要零。默认为 true。
来源:显示 | 在 GitHub 上
# File activesupport/lib/active_support/number_helper.rb, line 373 def number_to_human_size(number, options = {}) NumberToHumanSizeConverter.convert(number, options) end
number_to_percentage(number, options = {}) 链接
将number
格式化为百分比字符串。
number_to_percentage(100) # => "100.000%"
number_to_percentage("99") # => "99.000%"
number_to_percentage("99x") # => "99x%"
number_to_percentage(12345.6789, delimiter: ".", separator: ",", precision: 2)
# => "12.345,68%"
选项
:locale
-
用于格式化的语言环境。默认为当前语言环境。
number_to_percentage(1000, locale: :fr) # => "1000,000%"
:precision
-
精度级别,或
nil
以保留number
的精度。默认为 2。number_to_percentage(12.3456789, precision: 4) # => "12.3457%" number_to_percentage(99.999, precision: 0) # => "100%" number_to_percentage(99.999, precision: nil) # => "99.999%"
:round_mode
-
指定如何执行舍入。参见
BigDecimal.mode
。默认为:default
。number_to_percentage(12.3456789, precision: 4, round_mode: :down) # => "12.3456%"
:significant
-
:precision
是否应该应用于有效数字而不是小数位。默认为 false。number_to_percentage(12345.6789) # => "12345.679%" number_to_percentage(12345.6789, significant: true) # => "12300%" number_to_percentage(12345.6789, precision: 2) # => "12345.68%" number_to_percentage(12345.6789, precision: 2, significant: true) # => "12000%"
:separator
-
小数分隔符。默认为
"."
。 :delimiter
-
千位分隔符。默认为
","
。 :strip_insignificant_zeros
-
是否删除小数点后的不重要零。默认为 false。
:format
-
输出的格式。
%n
表示数字。默认为"%n%"
。number_to_percentage(100, format: "%n %") # => "100.000 %"
来源:显示 | 在 GitHub 上
# File activesupport/lib/active_support/number_helper.rb, line 223 def number_to_percentage(number, options = {}) NumberToPercentageConverter.convert(number, options) end
number_to_phone(number, options = {}) 链接
将number
格式化为电话号码。
number_to_phone(5551234) # => "555-1234"
number_to_phone("5551234") # => "555-1234"
number_to_phone(1235551234) # => "123-555-1234"
number_to_phone("12x34") # => "12x34"
number_to_phone(1235551234, delimiter: ".", country_code: 1, extension: 1343)
# => "+1.123.555.1234 x 1343"
选项
:area_code
-
是否为区号使用括号。默认为 false。
number_to_phone(1235551234, area_code: true) # => "(123) 555-1234"
:delimiter
-
要使用的数字分组分隔符。默认为
"-"
。number_to_phone(1235551234, delimiter: " ") # => "123 555 1234"
:country_code
-
要添加的国家/地区代码。
number_to_phone(1235551234, country_code: 1) # => "+1-123-555-1234"
:extension
-
要添加的扩展名。
number_to_phone(1235551234, extension: 555) # => "123-555-1234 x 555"
:pattern
-
一个正则表达式,指定如何对数字进行分组。正则表达式的第一个三个捕获被视为数字分组。
number_to_phone(13312345678, pattern: /(\d{3})(\d{4})(\d{4})$/) # => "133-1234-5678" number_to_phone(75561234567, pattern: /(\d{1,4})(\d{4})(\d{4})$/, area_code: true) # => "(755) 6123-4567"
来源:显示 | 在 GitHub 上
# File activesupport/lib/active_support/number_helper.rb, line 88 def number_to_phone(number, options = {}) NumberToPhoneConverter.convert(number, options) end
number_to_rounded(number, options = {}) 链接
将number
格式化为特定精度级别。
number_to_rounded(12345.6789) # => "12345.679"
number_to_rounded(12345.6789, precision: 2) # => "12345.68"
number_to_rounded(12345.6789, precision: 0) # => "12345"
number_to_rounded(12345, precision: 5) # => "12345.00000"
选项
:locale
-
用于格式化的语言环境。默认为当前语言环境。
number_to_rounded(111.234, locale: :fr) # => "111,234"
:precision
-
精度级别,或
nil
以保留number
的精度。默认为 3。number_to_rounded(12345.6789, precision: nil) # => "12345.6789"
:round_mode
-
指定如何执行舍入。参见
BigDecimal.mode
。默认为:default
。number_to_rounded(12.34, precision: 0, round_mode: :up) # => "13"
:significant
-
:precision
是否应该应用于有效数字而不是小数位。默认为 false。number_to_rounded(12345.6789) # => "12345.679" number_to_rounded(12345.6789, significant: true) # => "12300" number_to_rounded(12345.6789, precision: 2) # => "12345.68" number_to_rounded(12345.6789, precision: 2, significant: true) # => "12000"
:separator
-
小数分隔符。默认为
"."
。 :delimiter
-
千位分隔符。默认为
","
。 :strip_insignificant_zeros
-
是否删除小数点后的不重要零。默认为 false。
number_to_rounded(12.34, strip_insignificant_zeros: false) # => "12.340" number_to_rounded(12.34, strip_insignificant_zeros: true) # => "12.34" number_to_rounded(12.3456, strip_insignificant_zeros: true) # => "12.346"
来源:显示 | 在 GitHub 上
# File activesupport/lib/active_support/number_helper.rb, line 320 def number_to_rounded(number, options = {}) NumberToRoundedConverter.convert(number, options) end