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+---
+title: String.prototype.toLowerCase()
+slug: Web/JavaScript/Reference/Global_Objects/String/toLowerCase
+tags:
+  - JavaScript
+  - Method
+  - Prototype
+  - String
+  - toLowerCase()
+translation_of: Web/JavaScript/Reference/Global_Objects/String/toLowerCase
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>toLowerCase()</strong></code> 会将调用该方法的字符串值转为小写形式，并返回。</p>
+
+<h2 id="语法" style="margin-bottom: 20px; line-height: 30px;">语法</h2>
+
+<pre class="syntaxbox  language-html notranslate" style="margin-bottom: 0px; padding: 1em; border-left-width: 6px; border-left-style: solid; font-family: Consolas, Monaco, 'Andale Mono', monospace; font-size: 14px; direction: ltr; white-space: normal; text-shadow: none; background-color: rgba(212, 221, 228, 0.498039);"><code class="language-html" style="font-family: Consolas, Monaco, 'Andale Mono', monospace; direction: ltr; color: inherit; text-shadow: none;">str.toLowerCase()</code>
+</pre>
+
+<p id="sect1"></p>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个新的字符串，表示转换为小写的调用字符串。</p>
+
+<h2 id="描述" style="margin-bottom: 20px; line-height: 30px;">描述</h2>
+
+<p><code>toLowerCase</code> 会将调用该方法的字符串值转为小写形式，并返回。<code>toLowerCase</code> 不会影响字符串本身的值。</p>
+
+<h2 id="示例" style="margin-bottom: 20px; line-height: 30px;">示例</h2>
+
+<h3 id="例子：使用_toLowerCase" style="line-height: 24px;">例子：使用 <code>toLowerCase()</code></h3>
+
+<pre class="brush: js notranslate">console.log('中文简体 zh-CN || zh-Hans'.toLowerCase());
+// 中文简体 zh-cn || zh-hans
+
+console.log( "ALPHABET".toLowerCase() );
+// "alphabet"</pre>
+
+<div class="line-number" style="margin-top: 1em; position: absolute; left: 0px; right: 0px; line-height: inherit; top: 0px; background: 0px 0px;"></div>
+
+<p><font face="x-locale-heading-primary, zillaslab, Palatino, Palatino Linotype, x-locale-heading-secondary, serif"><span style="font-size: 37.33327865600586px;"><strong>说明</strong></span></font></p>
+
+
+
+<table>
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES1')}}</td>
+   <td>{{Spec2('ES1')}}</td>
+   <td>Initial definition. Implemented in JavaScript 1.0.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.5.4.16', 'String.prototype.toLowerCase')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-string.prototype.tolowercase', 'String.prototype.toLowerCase')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-string.prototype.tolowercase', 'String.prototype.toLowerCase')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td> <br>
+     </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("String.prototype.toLocaleLowerCase()")}}</li>
+ <li>{{jsxref("String.prototype.toLocaleUpperCase()")}}</li>
+ <li>{{jsxref("String.prototype.toUpperCase()")}}</li>
+</ul>