array.toLocaleString

toLocaleString()返回一个字符串表示数组中的元素。数组中的元素将使用各自的 toLocaleString方法转成字符串，这些字符串将使用一个特定语言环境的字符串（例如一个逗号 ","）隔开。

var number = 1337;
var date = new Date(
var myArr = [number, date, 'foo'];

var str = myArr.toLocaleString( 

console.log(str 
// logs '1337,6.12.2013 19:37:35,foo'
// if run in a German (de-DE) locale with timezone Europe/Berlin

语法

arr.toLocaleString(
arr.toLocaleString(locales
arr.toLocaleString(locales, options

参数

locales 可选

返回值

表示数组元素的字符串

示例

使用locales和options

数组中的元素将会使用各自的 toLocaleString 方法：

Object: Object.prototype.toLocaleString()

Number: Number.prototype.toLocaleString()

Date: Date.prototype.toLocaleString()

总是在prices数组中显示字符串和数字的货币符号：

var prices = ['￥7', 500, 8123, 12]; 
prices.toLocaleString('ja-JP', { style: 'currency', currency: 'JPY' }

// "￥7,￥500,￥8,123,￥12"

更多实例请看Intl,NumberFormat, 和DateTimeFormat页面.

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;
    }
  }
}

如果您需要支持真正过时的不支持的JavaScript引擎，Object.defineProperty最好不要填充Array.prototype方法，因为您不能使它们不可枚举。

规范

Specification	Status	Comment
ECMAScript Latest Draft (ECMA-262)The definition of 'Array.prototype.toLocaleString' in that specification.	Living Standard	Initial definition was in ECMAScript 3.
ECMAScript Internationalization API 4.0 (ECMA-402)The definition of 'Array.prototype.toLocaleString' in that specification.	Draft	This definition supersedes the definition provided in ECMA-262.

浏览器兼容性

Feature	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic Support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)
Optional locales parameter	?	?	52	?	?	?
Optional options parameter	?	?	52	?	?	?

Feature	Android	Chrome for Android	Edge mobile	Firefox for Android	IE mobile	Opera Android	iOS Safari
Basic Support	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)	(Yes)
Optional locales parameter	?	?	?	No	?	?	?
Optional options parameter	No	?	?	No	?	?	?