---
title: 取余 (%)
slug: Web/JavaScript/Reference/Operators/Remainder
tags:
  - JavaScript
  - Language feature
  - Operator
  - Reference
translation_of: Web/JavaScript/Reference/Operators/Remainder
original_slug: Web/JavaScript/Reference/Operators/取余
---
<div>{{jsSidebar("Operators")}}</div>

<p>当一个操作数除以第二个操作数时，取余运算符（％）返回剩余的余数。它与被除数的符号保持一致。</p>

<div>{{EmbedInteractiveExample("pages/js/expressions-remainder.html")}}</div>

<div></div>



<h2 id="语法">语法</h2>

<pre class="syntaxbox notranslate"><strong>Operator:</strong> <var>var1</var> % <var>var2</var>
</pre>

<h2 id="示例">示例</h2>

<h3 id="被除数为正数">被除数为正数</h3>

<pre class="brush: js notranslate"> 12 % 5  //  2
 1 % -2 //  1
 1 % 2  //  1
 2 % 3  //  2
5.5 % 2 // 1.5
</pre>

<h3 id="被除数为负数">被除数为负数</h3>

<pre class="brush: js notranslate">-12 % 5 // -2
-1 % 2  // -1
-4 % 2  // -0</pre>

<h3 id="被除数为NaN">被除数为NaN</h3>

<pre class="brush: js notranslate">NaN % 2 // NaN</pre>

<h2 id="规范">规范</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
  </tr>
  <tr>
   <td>{{SpecName('ESDraft', '#sec-multiplicative-operators', 'Remainder operator')}}</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>



<p>{{Compat("javascript.operators.remainder")}}</p>

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

<ul>
</ul>

<ul>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Addition">Addition operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Subtraction">Subtraction operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Division">Division operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Multiplication">Multiplication operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Exponentiation">Exponentiation operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Increment">Increment operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Decrement">Decrement operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Unary_negation">Unary negation operator</a></li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Unary_plus">Unary plus operator</a></li>
</ul>