---
title: Array.prototype.toLocaleString()
slug: Web/JavaScript/Reference/Global_Objects/Array/toLocaleString
tags:
  - Array
  - JavaScript
  - Method
translation_of: Web/JavaScript/Reference/Global_Objects/Array/toLocaleString
---
<div>{{JSRef("Global_Objects", "Array")}}</div>

<p><code><strong>toLocaleString()</strong></code> 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 <code>toLocaleString</code> 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。</p>

<div>{{EmbedInteractiveExample("pages/js/array-tolocalestring.html")}}</div>

<h2 id="Syntax" name="Syntax">语法</h2>

<pre class="syntaxbox"><font face="consolas, Liberation Mono, courier, monospace">arr.toLocaleString([locales[,options]]);</font></pre>

<h3 id="参数"><font face="consolas, Liberation Mono, courier, monospace">参数</font></h3>

<dl>
 <dt><code>locales</code> {{optional_inline}}</dt>
 <dd>带有BCP 47语言标记的字符串或字符串数组，关于<code>locales</code>参数的形式与解释，请看{{jsxref("Intl")}}页面。</dd>
 <dt><code>options</code> {{optional_inline}}</dt>
 <dd>一个可配置属性的对象，对于数字 {{jsxref("Number.prototype.toLocaleString()")}}，对于日期{{jsxref("Date.prototype.toLocaleString()")}}.</dd>
</dl>

<h3 id="返回值"><font face="consolas, Liberation Mono, courier, monospace">返回值</font></h3>

<p>表示数组元素的字符串。</p>

<h2 id="示例">示例</h2>

<h3 id="使用locales和options">使用<code>locales</code>和<code>options</code></h3>

<p>数组中的元素将会使用各自的 toLocaleString 方法：</p>

<ul>
 <li><code>Object</code>: {{jsxref("Object.prototype.toLocaleString()")}}</li>
 <li><code>Number</code>: {{jsxref("Number.prototype.toLocaleString()")}}</li>
 <li><code>Date</code>: {{jsxref("Date.prototype.toLocaleString()")}}</li>
</ul>

<p>总是在<code>prices</code>数组中显示字符串和数字的货币符号：</p>

<pre class="brush: js">var prices = ['￥7', 500, 8123, 12];
prices.toLocaleString('ja-JP', { style: 'currency', currency: 'JPY' });

// "￥7,￥500,￥8,123,￥12"</pre>

<p>更多实例请看 {{jsxref("Intl")}}，{{jsxref("NumberFormat")}}和{{jsxref("DateTimeFormat")}}页面。</p>

<h2 id="Polyfill">Polyfill</h2>

<pre class="brush: js">// 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 &gt;&gt;&gt; 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 &lt; len
      while (k &lt; 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;
    }
  });
}
</pre>

<p>如果你需要支持真正不支持<code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty">Object.defineProperty</a></code>的JavaScript引擎，最好不要对<code>Array.prototype</code>方法进行填充，因为你不能使它们不可枚举。</p>

<h2 id="规范">规范</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>{{SpecName('ESDraft', '#sec-array.prototype.tolocalestring', 'Array.prototype.toLocaleString')}}</td>
   <td>{{Spec2('ESDraft')}}</td>
   <td>Initial definition was in ECMAScript 3.</td>
  </tr>
  <tr>
   <td>{{SpecName('ES Int Draft', '#sup-array.prototype.tolocalestring', 'Array.prototype.toLocaleString')}}</td>
   <td>{{Spec2('ES Int Draft')}}</td>
   <td>This definition supersedes the definition provided in ECMA-262.</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>



<p>{{Compat("javascript.builtins.Array.toLocaleString")}}</p>

<h2 id="See_also" name="See_also">参见</h2>

<ul>
 <li>{{jsxref("Array.prototype.toString()")}}</li>
 <li>{{jsxref("Intl")}}</li>
 <li>{{jsxref("Object.prototype.toLocaleString()")}}</li>
 <li>{{jsxref("Number.prototype.toLocaleString()")}}</li>
 <li>{{jsxref("Date.prototype.toLocaleString()")}}</li>
</ul>