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+---
+title: 按位与 (&)
+slug: Web/JavaScript/Reference/Operators/按位与
+translation_of: Web/JavaScript/Reference/Operators/Bitwise_AND
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p>按位与运算符 (<code>&amp;</code>) 在每个位上返回 <code>1</code> ，这两个操作数对应的位都是 <code>1</code>.</p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-bitwise-and.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> &amp; <var>b</var></code>
+</pre>
+
+<h2 id="描述">描述</h2>
+
+<p>操作数被转换为32位整数，并由一系列位（0和1）表示。 超过32位的数字将丢弃其最高有效位。 例如，以下大于32位的整数将被转换为32位整数：</p>
+
+<pre class="brush: js notranslate">Before: 11100110111110100000000000000110000000000001
+After:              10100000000000000110000000000001</pre>
+
+<p>第一个操作数中的每个位都与第二个操作数中的相应位配对：第一位到第一位，第二位到第二位，依此类推。</p>
+
+<p>将运算符应用于每对位，然后按位构造结果。</p>
+
+<p>与运算的真值表：</p>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th class="header" scope="col">a</th>
+   <th class="header" scope="col">b</th>
+   <th class="header" scope="col">a AND b</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>0</td>
+   <td>0</td>
+   <td>0</td>
+  </tr>
+  <tr>
+   <td>0</td>
+   <td>1</td>
+   <td>0</td>
+  </tr>
+  <tr>
+   <td>1</td>
+   <td>0</td>
+   <td>0</td>
+  </tr>
+  <tr>
+   <td>1</td>
+   <td>1</td>
+   <td>1</td>
+  </tr>
+ </tbody>
+</table>
+
+<pre class="brush: js notranslate">.    9 (base 10) = 00000000000000000000000000001001 (base 2)
+    14 (base 10) = 00000000000000000000000000001110 (base 2)
+                   --------------------------------
+14 &amp; 9 (base 10) = 00000000000000000000000000001000 (base 2) = 8 (base 10)
+</pre>
+
+<p>将任何数字<code>x</code>与<code>0</code>进行按位与运算将得出<code>0</code>。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用按位与">使用按位与</h3>
+
+<pre class="brush: js notranslate">// 5: 00000000000000000000000000000101
+// 2: 00000000000000000000000000000010
+5 &amp; 2; // 0</pre>
+
+<h2 id="规范说明">规范说明</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('ESDraft', '#prod-BitwiseANDExpression', 'Bitwise AND expression')}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.operators.bitwise_and")}}</p>
+
+<h2 id="参阅">参阅</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/Bitwise_AND_assignment">Bitwise AND assignment operator</a></li>
+</ul>