---
title: Multiplication assignment (*=)
slug: Web/JavaScript/Reference/Operators/Multiplication_assignment
translation_of: Web/JavaScript/Reference/Operators/Multiplication_assignment
---
<div>{{jsSidebar("Operators")}}</div>

<p>The multiplication assignment operator (<code>*=</code>) multiplies a variable by the value of the right operand and assigns the result to the variable.</p>

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





<h2 id="语法">语法</h2>

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

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

<h3 id="Using_multiplication_assignment">Using multiplication assignment</h3>

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

bar *= 2     // 10
bar *= 'foo' // 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.multiplication_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/Multiplication">Multiplication operator</a></li>
</ul>