---
title: Bitwise OR assignment (|=)
slug: Web/JavaScript/Reference/Operators/Bitwise_OR_assignment
translation_of: Web/JavaScript/Reference/Operators/Bitwise_OR_assignment
---
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<p>The bitwise OR assignment operator (<code>|=</code>) uses the binary representation of both operands, does a bitwise OR operation on them and assigns the result to the variable.</p>

<div>{{EmbedInteractiveExample("pages/js/expressions-bitwise-or-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_bitwise_OR_assignment">Using bitwise OR assignment</h3>

<pre class="brush: js">let a = 5;
a |= 2; // 7
// 5: 00000000000000000000000000000101
// 2: 00000000000000000000000000000010
// -----------------------------------
// 7: 00000000000000000000000000000111</pre>

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

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

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



<p>{{Compat("javascript.operators.bitwise_or_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/Bitwise_OR">Bitwise OR operator</a></li>
 <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/Logical_OR_assignment">Logical OR assignment (<code>||=</code>)</a></li>
</ul>