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• 句法
• 描述
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

Intl.Numberformat.prototype.formatToParts() method allows locale-aware formatting of strings produced by NumberFormat formatters.

句法

Intl.NumberFormat.prototype.formatToParts(number)
					

参数

number 可选

Number or BigInt to format.

返回值

Array of objects containing the formatted number in parts.

描述

formatToParts() method is useful for custom formatting of number strings. It returns an Array of objects containing the locale-specific tokens from which it possible to build custom strings while preserving the locale-specific parts. The structure the formatToParts() method returns, looks like this:

[
  { type: "integer", value: "3" },
  { type: "group", value: "." },
  { type: "integer", value: "500" }
]
					

Possible types are the following:

currency

The currency string, such as the symbols "$" and "€" or the name "Dollar", "Euro" depending on how currencyDisplay 被指定。

decimal

The decimal separator string (".").

fraction

The fraction number.

group

The group separator string (",").

infinity

Infinity string ("∞").

integer

The integer number.

literal

Any literal strings or whitespace in the formatted number.

minusSign

The minus sign string ("-").

nan

NaN string ("NaN").

plusSign

The plus sign string ("+").

percentSign

The percent sign string ("%").

范例

Comparing format and formatToParts

NumberFormat outputs localized, opaque strings that cannot be manipulated directly:

var number = 3500;
var formatter = new Intl.NumberFormat('de-DE', {
  style: 'currency',
  currency: 'EUR'
});
formatter.format(number);
// "3.500,00 €"
					

However, in many User Interfaces there is a desire to customize the formatting of this string. The formatToParts method enables locale-aware formatting of strings produced by NumberFormat formatters by providing you the string in parts:

formatter.formatToParts(number);
// return value:
[
  { type: "integer",  value: "3"   },
  { type: "group",    value: "."   },
  { type: "integer",  value: "500" },
  { type: "decimal",  value: ","   },
  { type: "fraction", value: "00"  },
  { type: "literal",  value: " "   },
  { type: "currency", value: "€"   }
]
					

Now the information is available separately and it can be formatted and concatenated again in a customized way. For example by using Array.prototype.map() , 箭头函数 ， switch statement , template literals ，和 Array.prototype.reduce() .

var numberString = formatter.formatToParts(number).map(({type, value}) => {
  switch (type) {
    case 'currency': return `<strong>${value}</strong>`;
    default : return value;
  }
}).reduce((string, part) => string + part);
					

This will make the currency bold, when using the formatToParts() 方法。

console.log(numberString);
// "3.500,00 <strong>€</strong>"
					

规范

规范
ECMAScript 国际化 API (ECMA-402) The definition of 'Intl.NumberFormat.prototype.formatToParts' in that specification.

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
formatToParts	Chrome 64	Edge 12	Firefox 58	IE No	Opera 51	Safari 13	WebView Android 64	Chrome Android 64	Firefox Android 58	Opera Android 47	Safari iOS 13	Samsung Internet Android 9.0	nodejs 10.0.0 10.0.0 Before version 13.0.0, only the locale data for en-US is available by default. See the NumberFormat() 构造函数 了解更多细节。

图例

完整支持

完整支持

不支持

不支持

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

见实现注意事项。

另请参阅

• Intl.NumberFormat
• Intl.NumberFormat.prototype.format
• Formatting dates: Intl.DateTimeFormat.prototype.formatToParts()

元数据

• 最后修改： Jul 30, 2020

相关话题

1. 标准内置对象
2. Intl
3. 方法
   1. Intl.getCanonicalLocales()
4. 相关页面：
5. Collator
6. DateTimeFormat
7. ListFormat
8. NumberFormat
9. PluralRules
10. RelativeTimeFormat
11. 继承：
12. Object
13. 特性
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
14. 方法
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource()
    10. Object.prototype.toString()
    11. Object.prototype.valueOf()
    12. Object.setPrototypeOf()