---
title: String.prototype.trimRight()
slug: Web/JavaScript/Reference/Global_Objects/String/trimEnd
tags:
  - JavaScript
  - Method
  - Prototype
  - String
translation_of: Web/JavaScript/Reference/Global_Objects/String/trimEnd
original_slug: Web/JavaScript/Reference/Global_Objects/String/TrimRight
---
<div>{{JSRef}}</div>

<p><code><strong>trimEnd()</strong> </code>方法从一个字符串的末端移除空白字符。trimRight() 是这个方法的别名。</p>

<p>{{EmbedInteractiveExample("pages/js/string-trimend.html")}}</p>

<p>The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone <a href="https://github.com/mdn/interactive-examples">https://github.com/mdn/interactive-examples</a> and send us a pull request.</p>

<h2 id="Syntax" name="Syntax">语法</h2>

<pre class="syntaxbox"><code><var>str</var>.trimEnd();
<var>str</var>.trimRight();</code></pre>

<h3 id="返回值">返回值</h3>

<p>一个新字符串，表示从调用字串的末（右）端除去空白。</p>

<h2 id="Description" name="Description">描述</h2>

<p><code>trimEnd()</code> / <code>trimRight()</code>方法移除原字符串右端的连续空白符并返回，<code>trimEnd()</code> / <code>trimRight()</code>方法并不会直接修改原字符串本身。</p>

<h3 id="别名">别名</h3>

<p>为了与 {{jsxref("String.prototype.padEnd")}} 等函数保持一致，标准方法名称为<code>trimEnd</code>。 但是，出于Web兼容性原因，<code>trimRight</code>仍然是<code>trimEnd</code>的别名。 在某些引擎中，这意味着：</p>

<pre class="brush: js"><code>String.prototype.trimRight.name === "trimEnd";</code>
</pre>

<h2 id="Examples" name="Examples">示例</h2>

<h3 id="使用trimEnd">使用<code>trimEnd()</code></h3>

<p>下面的例子输出了小写的字符串"   foo":</p>

<pre class="brush:js;highlight:[5]">var str = "   foo  ";

alert(str.length); // 8

str = str.trimRight();  // 或写成str = str.trimEnd();
console.log(str.length); // 6
console.log(str);       // '   foo'
</pre>

<h2 id="Specifications">Specifications</h2>

<table>
 <thead>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td><code><a href="https://github.com/tc39/proposal-string-left-right-trim/#stringprototypetrimstart--stringprototypetrimend">String.prototype.{trimStart,trimEnd}</a></code>proposal</td>
   <td>Stage 4</td>
   <td>Expected to be part of ES2019</td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<p>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.String.trimEnd")}}</p>

<h2 id="See_also" name="See_also">相关链接</h2>

<ul>
 <li>{{jsxref("String.prototype.trim()")}}</li>
 <li>{{jsxref("String.prototype.trimStart()")}}</li>
</ul>