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+---
+title: 左移 (<<)
+slug: Web/JavaScript/Reference/Operators/Left_shift
+translation_of: Web/JavaScript/Reference/Operators/Left_shift
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p><strong>左移操作符 (<code>&lt;&lt;</code>)</strong> 将第一个操作数向左移动指定位数，左边超出的位数将会被清除，右边将会补零。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-left-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> &lt;&lt; <var>b</var></code>
+</pre>
+
+<h2 id="描述">描述</h2>
+
+<p>左移操作符将第一个操作数向左移动指定位数，左边超出的位数将会被清除，右边将会补零。</p>
+
+<p>例如， <code>9 &lt;&lt; 2</code> 得出 36：</p>
+
+<pre class="brush: js notranslate">.    9 (十进制): 00000000000000000000000000001001 (二进制)
+                  --------------------------------
+9 &lt;&lt; 2 (十进制): 00000000000000000000000000100100 (二进制) = 36 (十进制)
+</pre>
+
+<p>移动任意数字 <code>x</code> 至左边 <code>y</code> 位，得出 <code>x * 2 ** y</code> 。<br>
+ 所以例如：<code>9 &lt;&lt; 3</code> 等价于 <code>9 * 2³ = 9 * 8 = 72</code>。</p>
+
+<h2 id="例子">例子</h2>
+
+<h3 id="使用左移">使用左移</h3>
+
+<pre class="brush: js notranslate">9 &lt;&lt; 3; // 72
+
+// 9 * 2³ = 9 * 8 = 72
+</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.left_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/Left_shift_assignment">Left shift assignment operator</a></li>
+</ul>
+
+<p>
+ <audio style="display: none;"></audio>
+</p>