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authorFlorian Merz <me@fiji-flo.de>2021-02-11 12:56:40 +0100
committerFlorian Merz <me@fiji-flo.de>2021-02-11 12:56:40 +0100
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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>