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+---
+title: String.prototype.sub()
+slug: Web/JavaScript/Reference/Global_Objects/String/sub
+tags:
+  - String.sub()
+  - 已废弃
+translation_of: Web/JavaScript/Reference/Global_Objects/String/sub
+---
+<div>{{JSRef}} {{deprecated_header}}</div>
+
+<p><strong><code>sub()</code></strong>方法创建一个 {{HTMLElement("sub")}} HTML 元素，使字符串展示为下标。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><code><var>str</var>.sub()</code></pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>包含{{HTMLElement("sub")}} HTML 元素的字符串。</p>
+
+<h2 id="描述">描述</h2>
+
+<p><code>sub()</code>方法将字符串嵌入<code>&lt;sub&gt;</code>标签： <code>"&lt;sub&gt;str&lt;/sub&gt;"</code>.</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用sub()和sup()方法">使用<code>sub()</code>和<code>sup()</code>方法</h3>
+
+<p>下面的示例使用了<code>sub()</code>和{{jsxref("String.prototype.sup()", "sup()")}}方法来格式化字符串：</p>
+
+<pre class="brush: js">var superText = 'superscript';
+var subText = 'subscript';
+
+console.log('This is what a ' + superText.sup() + ' looks like.');
+// 这就是&lt;sup&gt;superscript&lt;/sup&gt;的样子。
+
+console.log('This is what a ' + subText.sub() + ' looks like.');
+// 这就是&lt;sub&gt;subscript&lt;/sub&gt;的样子。
+</pre>
+
+<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('ES6', '#sec-string.prototype.sub', 'String.prototype.sub')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>初始定义。在 JavaScript 1.0 中实现。在（规范性）附件 B 中定义为用于 Web 浏览器的 ECMAScript 附加特性。</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-string.prototype.sub', 'String.prototype.sub')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td>在（规范性）附件 B 中定义为用于 Web 浏览器的 ECMAScript 附加特性。</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>{{CompatGeckoDesktop("1.0")}}</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>{{CompatGeckoMobile("1.0")}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="另见">另见</h2>
+
+<ul>
+ <li>{{jsxref("String.prototype.sup()")}}</li>
+</ul>