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---
title: String.prototype.sup()
slug: Web/JavaScript/Reference/Global_Objects/String/sup
tags:
- String.prototype.sup()
translation_of: Web/JavaScript/Reference/Global_Objects/String/sup
---
<div>{{JSRef}} {{deprecated_header}}</div>
<p><strong><code>sup()</code></strong>方法创建 一个{{HTMLElement("sup")}}HTML 元素,使字符串显示为上标。</p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox"><code><var>str</var>.sup()</code></pre>
<h3 id="返回值">返回值</h3>
<p>包含{{HTMLElement("sup")}} HTML 元素的字符串。</p>
<h2 id="描述">描述</h2>
<p><code>sup()</code> 方法将字符串嵌入 <code><sup></code> 标签中:<code>"<sup>str</sup>"</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{{jsxref("String.prototype.sub()", "sub()")}}和<code>sup()</code>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<sup>superscript</sup>的样子。"
console.log('This is what a ' + subText.sub() + ' looks like.');
// "这就是<sub>subscript</sub>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.sup', 'String.prototype.sup')}}</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.sup', 'String.prototype.sup')}}</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.sub()")}}</li>
</ul>
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