Hàm toLocaleString() trả về 1 chuỗi các phần tử trong mảng. Các phần tử này được chuyển đổi sang kiểu chuỗi nhờ hàm toLocalString và được ngăn cách với nhau bằng một xâu đặc biệt (ví dụ : dấu phẩy (,))
Syntax
arr.toLocaleString([locales[, options]]);
Parameters
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 theIntl
page. options
Optional- An object with configuration properties, for numbers see
Number.prototype.toLocaleString()
, and for dates seeDate.prototype.toLocaleString()
.
Return value
A string representing the elements of the array.
Examples
Using locales and options
The elements of the array are converted to strings using their toLocaleString
methods.
Object
:Object.prototype.toLocaleString()
Number
:Number.prototype.toLocaleString()
Date
:Date.prototype.toLocaleString()
Always display the currency for the strings and numbers in the prices
array:
var prices = ['¥7', 500, 8123, 12];
prices.toLocaleString('ja-JP', { style: 'currency', currency: 'JPY' });
// "¥7,¥500,¥8,123,¥12"
For more examples, see also the Intl
, NumberFormat
, and DateTimeFormat
pages.
Polyfill
// https://tc39.github.io/ecma402/#sup-array.prototype.tolocalestring
if (!Array.prototype.toLocaleString) {
Object.defineProperty(Array.prototype, 'toLocaleString', {
value: function(locales, options) {
// 1. Let O be ? ToObject(this value).
if (this == null) {
throw new TypeError('"this" is null or not defined');
}
var a = Object(this);
// 2. Let len be ? ToLength(? Get(A, "length")).
var len = a.length >>> 0;
// 3. Let separator be the String value for the
// list-separator String appropriate for the
// host environment's current locale (this is
// derived in an implementation-defined way).
// NOTE: In this case, we will use a comma
var separator = ',';
// 4. If len is zero, return the empty String.
if (len === 0) {
return '';
}
// 5. Let firstElement be ? Get(A, "0").
var firstElement = a[0];
// 6. If firstElement is undefined or null, then
// a.Let R be the empty String.
// 7. Else,
// a. Let R be ?
// ToString(?
// Invoke(
// firstElement,
// "toLocaleString",
// « locales, options »
// )
// )
var r = firstElement == null ?
'' : firstElement.toLocaleString(locales, options);
// 8. Let k be 1.
var k = 1;
// 9. Repeat, while k < len
while (k < len) {
// a. Let S be a String value produced by
// concatenating R and separator.
var s = r + separator;
// b. Let nextElement be ? Get(A, ToString(k)).
var nextElement = a[k];
// c. If nextElement is undefined or null, then
// i. Let R be the empty String.
// d. Else,
// i. Let R be ?
// ToString(?
// Invoke(
// nextElement,
// "toLocaleString",
// « locales, options »
// )
// )
r = nextElement == null ?
'' : nextElement.toLocaleString(locales, options);
// e. Let R be a String value produced by
// concatenating S and R.
r = s + r;
// f. Increase k by 1.
k++;
}
// 10. Return R.
return r;
}
});
}
If you need to support truly obsolete JavaScript engines that don't support Object.defineProperty
, it's best not to polyfill Array.prototype
methods at all, as you can't make them non-enumerable.
Specifications
Browser compatibility
BCD tables only load in the browser
The compatibility table in 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.