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+---
+title: Unsigned right shift (>>>)
+slug: Web/JavaScript/Reference/Operators/Unsigned_right_shift
+translation_of: Web/JavaScript/Reference/Operators/Unsigned_right_shift
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p>The <strong>unsigned right shift operator (<code>&gt;&gt;&gt;</code>)</strong> (zero-fill right shift) shifts the first operand the specified number of bits to the right. Excess bits shifted off to the right are discarded. Zero bits are shifted in from the left. The sign bit becomes <code>0</code>, so the result is always non-negative. Unlike the other bitwise operators, zero-fill right shift returns an unsigned 32-bit integer.</p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-unsigned-right-shift.html")}}</div>
+
+<div class="hidden">The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone <a href="https://github.com/mdn/interactive-examples">https://github.com/mdn/interactive-examples</a> and send us a pull request.</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox notranslate"><code><var>a</var> &gt;&gt;&gt; <var>b</var></code>
+</pre>
+
+<h2 id="描述">描述</h2>
+
+<p>This operator shifts the first operand the specified number of bits to the right. Excess bits shifted off to the right are discarded. Zero bits are shifted in from the left. The sign bit becomes <code>0</code>, so the result is always non-negative. Unlike the other bitwise operators, zero-fill right shift returns an unsigned 32-bit integer.</p>
+
+<p>For non-negative numbers, zero-fill right shift and sign-propagating right shift yield the same result. For example, <code>9 &gt;&gt;&gt; 2</code> yields 2, the same as <code>9 &gt;&gt; 2</code>:</p>
+
+<pre class="brush: js notranslate">.     9 (base 10): 00000000000000000000000000001001 (base 2)
+                   --------------------------------
+9 &gt;&gt;&gt; 2 (base 10): 00000000000000000000000000000010 (base 2) = 2 (base 10)
+</pre>
+
+<p>However, this is not the case for negative numbers. For example, <code>-9 &gt;&gt;&gt; 2</code> yields 1073741821, which is different than <code>-9 &gt;&gt; 2</code> (which yields <code>-3</code>):</p>
+
+<pre class="brush: js notranslate">.     -9 (base 10): 11111111111111111111111111110111 (base 2)
+                    --------------------------------
+-9 &gt;&gt;&gt; 2 (base 10): 00111111111111111111111111111101 (base 2) = 1073741821 (base 10)
+</pre>
+
+<h2 id="例子">例子</h2>
+
+<h3 id="Using_unsigned_right_shift">Using unsigned right shift</h3>
+
+<pre class="brush: js notranslate"> 9 &gt;&gt;&gt; 2; // 2
+-9 &gt;&gt;&gt; 2; // 1073741821
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-bitwise-shift-operators', 'Bitwise Shift Operators')}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.operators.unsigned_right_shift")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#Bitwise">Bitwise operators in the JS guide</a></li>
+ <li><a href="/en-US/docs/Web/JavaScript/Reference/Operators/Unsigned_right_shift_assignment">Unsigned right shift assignment operator</a></li>
+</ul>