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。

语法

arr.toLocaleString([locales[,options]]);

参数

locales 可选
带有BCP 47语言标记的字符串或字符串数组,关于locales参数的形式与解释,请看Intl页面。
options 可选
一个可配置属性的对象,对于数字 Number.prototype.toLocaleString(),对于日期Date.prototype.toLocaleString().

返回值

表示数组元素的字符串。

示例

使用localesoptions

数组中的元素将会使用各自的 toLocaleString 方法:

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 IntlNumberFormatDateTimeFormat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;
    }
  });
}

如果你需要支持真正不支持Object.defineProperty的JavaScript引擎,最好不要对Array.prototype方法进行填充,因为你不能使它们不可枚举。

规范

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

浏览器兼容性

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
Basic supportChrome Full support YesEdge Full support YesFirefox Full support 1IE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yesnodejs Full support Yes
Optional locales parameterChrome ? Edge ? Firefox Full support 52IE ? Opera ? Safari ? WebView Android ? Chrome Android ? Edge Mobile ? Firefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android ? nodejs ?
Optional options parameterChrome ? Edge ? Firefox Full support 52IE ? Opera ? Safari ? WebView Android No support NoChrome Android ? Edge Mobile ? Firefox Android No support NoOpera Android ? Safari iOS ? Samsung Internet Android ? nodejs ?

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

参见

文档标签和贡献者

标签: 
此页面的贡献者: fscholz, zhangchen, badfl, zxhycxq, AlexChao
最后编辑者: fscholz,