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+---
+title: Exponentiation assignment (**=)
+slug: Web/JavaScript/Reference/Operators/Exponentiation_assignment
+translation_of: Web/JavaScript/Reference/Operators/Exponentiation_assignment
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p>The exponentiation assignment operator (<code>**=</code>) raises the value of a variable to the power of the right operand.</p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-exponentiation-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_exponentiation_assignment">Using exponentiation assignment</h3>
+
+<pre class="brush: js notranslate">// Assuming the following variable
+// bar = 5
+
+bar **= 2 // 25
+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.exponentiation_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/Exponentiation">Exponentiation operator</a></li>
+</ul>
+
+<p>
+ <audio style="display: none;"></audio>
+</p>