---
title: Remainder assignment (%=)
slug: Web/JavaScript/Reference/Operators/Remainder_assignment
translation_of: Web/JavaScript/Reference/Operators/Remainder_assignment
---
<div>{{jsSidebar("Operators")}}</div>

<p>The remainder assignment operator (<code>%=</code>) divides a variable by the value of the right operand and assigns the remainder to the variable.</p>

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

<div></div>



<h2 id="语法">语法</h2>

<pre class="syntaxbox notranslate"><strong>Operator:</strong> x %= y
<strong>Meaning:</strong>  x  = x % y</pre>

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

<h3 id="Using_remainder_assignment">Using remainder assignment</h3>

<pre class="brush: js notranslate">// Assuming the following variable
//  bar = 5

bar %= 2     // 1
bar %= 'foo' // NaN
bar %= 0     // NaN</pre>

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

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

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



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

<h2 id="See_also">See also</h2>

<ul>
 <li><a href="/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#Assignment">Assignment operators in the JS guide</a></li>
 <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/Remainder">Remainder operator</a></li>
</ul>