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+---
+title: BigInt.prototype.toLocaleString()
+slug: Web/JavaScript/Reference/Global_Objects/BigInt/toLocaleString
+translation_of: Web/JavaScript/Reference/Global_Objects/BigInt/toLocaleString
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>toLocaleString()</code></strong> 方法返回一个字符串，该字符串具有此 <code>BigInt</code> 的 language-sensitive 表达形式。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/bigint-tolocalestring.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><code><em>bigIntObj</em>.toLocaleString(</code><code>[locales [, options]])</code></pre>
+
+<h3 id="参数">参数</h3>
+
+<p><code>locales</code> 和 <code>options</code> 参数可自定义函数的行为，并允许应用程序指定应使用其格式约定的语言。在忽略 <code>locales</code> 和 <code>options</code> 参数的实现中，使用的 <code>locale</code> 和返回的字符串形式完全依赖于实现。</p>
+
+<div>{{page('/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/NumberFormat', '参数')}}</div>
+
+<h3 id="返回值">返回值</h3>
+
+<p>具有此 <code>BigInt</code> 的 language-sensitive 表示形式的字符串。</p>
+
+<h2 id="例子">例子</h2>
+
+<h3 id="Using_toLocaleString">Using <code>toLocaleString</code></h3>
+
+<p>在不指定语言环境的基本用法中，将返回默认语言环境中带默认选项的格式化字符串。</p>
+
+<pre class="brush: js">var bigint = 3500n;
+
+bigint.toLocaleString();
+// Displays "3,500" if in U.S. English locale
+</pre>
+
+<h3 id="Using_locales">Using <code>locales</code></h3>
+
+<p>这个例子展示了本地化数字格式的一些变体。为了获得应用程序用户界面中使用的语言的格式，请确保使用 <code>locales</code> 参数指定该语言（可能还有一些备用语言）：</p>
+
+<pre class="brush: js">var bigint = 123456789123456789n;
+
+// German uses period for thousands
+console.log(bigint.toLocaleString('de-DE'));
+// → 123.456.789.123.456.789
+
+// Arabic in most Arabic speaking countries uses <a href="https://en.wikipedia.org/wiki/Eastern_Arabic_numerals">Eastern Arabic</a> digits
+console.log(bigint.toLocaleString('ar-EG'));
+// → ١٢٣٬٤٥٦٬٧٨٩٬١٢٣٬٤٥٦٬٧٨٩
+
+// India uses thousands/lakh/crore separators
+console.log(bigint.toLocaleString('en-IN'));
+// → 1,23,45,67,89,12,34,56,789
+
+// the nu extension key requests a numbering system, e.g. Chinese decimal
+console.log(bigint.toLocaleString('zh-Hans-CN-u-nu-hanidec'));
+// → 一二三,四五六,七八九,一二三,四五六,七八九
+
+// when requesting a language that may not be supported, such as
+// Balinese, include a fallback language, in this case Indonesian
+console.log(bigint.toLocaleString(['ban', 'id']));
+// → 123.456.789.123.456.789
+</pre>
+
+<h3 id="Using_options">Using <code>options</code></h3>
+
+<p><code>toLocaleString</code> 提供的结果可以使用 <code>options</code> 参数进行自定义：</p>
+
+<pre class="brush: js">var bigint = 123456789123456789n;
+
+// request a currency format
+console.log(bigint.toLocaleString('de-DE', { style: 'currency', currency: 'EUR' }));
+// → 123.456.789.123.456.789,00 €
+
+// the Japanese yen doesn't use a minor unit
+console.log(bigint.toLocaleString('ja-JP', { style: 'currency', currency: 'JPY' }))
+// → ￥123,456,789,123,456,789
+
+// limit to three significant digits
+console.log(bigint.toLocaleString('en-IN', { maximumSignificantDigits: 3 }));
+// → 1,23,00,00,00,00,00,00,000
+</pre>
+
+<h2 id="性能">性能</h2>
+
+<p>格式化大量数字时，最好创建 {{jsxref("NumberFormat")}} 对象并使用其 {{jsxref("NumberFormat.format")}} 属性提供的函数。</p>
+
+<h2 id="标准">标准</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+  </tr>
+  <tr>
+   <td><a href="https://tc39.es/ecma402/#sup-bigint.prototype.tolocalestring">BigInt</a></td>
+   <td>Stage 3</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器支持">浏览器支持</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("javascript.builtins.BigInt.toLocaleString")}}</p>
+
+<h2 id="请参阅">请参阅</h2>
+
+<ul>
+ <li>{{jsxref("BigInt.toString()")}}</li>
+</ul>