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+---
+title: Left shift assignment (<<=)
+slug: Web/JavaScript/Reference/Operators/Left_shift_assignment
+translation_of: Web/JavaScript/Reference/Operators/Left_shift_assignment
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p>The left shift assignment operator (<code>&lt;&lt;=</code>) moves the specified amount of bits to the left and assigns the result to the variable.</p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-left-shift-assignment.html")}}</div>
+
+<div></div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate"><strong>Operator:</strong> x &lt;&lt;= y
+<strong>Meaning:</strong>  x   = x &lt;&lt; y</pre>
+
+<h2 id="Examples">Examples</h2>
+
+<h3 id="Using_left_shift_assignment">Using left shift assignment</h3>
+
+<pre class="brush: js notranslate">let a = 5;
+// 00000000000000000000000000000101
+
+a &lt;&lt;= 2; // 20
+// 00000000000000000000000000010100</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.left_shift_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/Left_shift">Left shift operator</a></li>
+</ul>
+
+<p>
+ <audio style="display: none;"></audio>
+</p>