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Intl.RelativeTimeFormat - JavaScript 编辑

The Intl.RelativeTimeFormat object enables language-sensitive relative time formatting.

Constructor

Intl.RelativeTimeFormat.RelativeTimeFormat(): Creates a new Intl.RelativeTimeFormat object.

Static methods

Intl.RelativeTimeFormat.supportedLocalesOf(): Returns an array containing those of the provided locales that are supported without having to fall back to the runtime's default locale.

Instance methods

Intl.RelativeTimeFormat.prototype.format(): Formats a value and a unit according to the locale and formatting options of the given Intl.RelativeTimeFormat object.
Intl.RelativeTimeFormat.prototype.formatToParts(): Returns an Array of objects representing the relative time format in parts that can be used for custom locale-aware formatting.
Intl.RelativeTimeFormat.prototype.resolvedOptions(): Returns a new object with properties reflecting the locale and formatting options computed during initialization of the object.

Examples

Basic format usage

The following example shows how to use a relative time formatter for the English language.

// Create a relative time formatter in your locale
// with default values explicitly passed in.
const rtf = new Intl.RelativeTimeFormat("en", {
    localeMatcher: "best fit", // other values: "lookup"
    numeric: "always", // other values: "auto"
    style: "long", // other values: "short" or "narrow"
});

// Format relative time using negative value (-1).
rtf.format(-1, "day");
// > "1 day ago"

// Format relative time using positive  value (1).
rtf.format(1, "day");
// > "in 1 day"

Using formatToParts

The following example shows how to create a relative time formatter returning formatted parts

const rtf = new Intl.RelativeTimeFormat("en", { numeric: "auto" });

// Format relative time using the day unit.
rtf.formatToParts(-1, "day");
// > [{ type: "literal", value: "yesterday"}]

rtf.formatToParts(100, "day");
// > [{ type: "literal", value: "in " },
// >  { type: "integer", value: "100", unit: "day" },
// >  { type: "literal", value: " days" }]