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author | Florian Dieminger <me@fiji-flo.de> | 2021-02-11 18:29:51 +0100 |
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committer | GitHub <noreply@github.com> | 2021-02-11 18:29:51 +0100 |
commit | 2bc5610921312613f8623f7ed347aa576689b2b6 (patch) | |
tree | f17a7a00e232c97d1335ff3cb24dbcfafacfe141 /files/zh-cn/web/javascript/reference/operators/bitwise_and | |
parent | 964decad361766e85d928a56f0ab80af0e75c172 (diff) | |
parent | fc56124ac4eda6b3f0349c8a16fa750f27b4c7d6 (diff) | |
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Merge pull request #32 from fiji-flo/unslugging-zh-cn
Unslugging zh cn
Diffstat (limited to 'files/zh-cn/web/javascript/reference/operators/bitwise_and')
-rw-r--r-- | files/zh-cn/web/javascript/reference/operators/bitwise_and/index.html | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/files/zh-cn/web/javascript/reference/operators/bitwise_and/index.html b/files/zh-cn/web/javascript/reference/operators/bitwise_and/index.html new file mode 100644 index 0000000000..9010ddf09b --- /dev/null +++ b/files/zh-cn/web/javascript/reference/operators/bitwise_and/index.html @@ -0,0 +1,107 @@ +--- +title: 按位与 (&) +slug: Web/JavaScript/Reference/Operators/Bitwise_AND +translation_of: Web/JavaScript/Reference/Operators/Bitwise_AND +original_slug: Web/JavaScript/Reference/Operators/按位与 +--- +<div>{{jsSidebar("Operators")}}</div> + +<p>按位与运算符 (<code>&</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> & <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 & 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 & 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> |