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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/zh-cn/web/javascript/reference/global_objects/atomics/and | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
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diff --git a/files/zh-cn/web/javascript/reference/global_objects/atomics/and/index.html b/files/zh-cn/web/javascript/reference/global_objects/atomics/and/index.html new file mode 100644 index 0000000000..87754093bc --- /dev/null +++ b/files/zh-cn/web/javascript/reference/global_objects/atomics/and/index.html @@ -0,0 +1,130 @@ +--- +title: Atomics.and() +slug: Web/JavaScript/Reference/Global_Objects/Atomics/and +tags: + - Atomics + - JavaScript + - 共享内存 + - 实验性 + - 方法 +translation_of: Web/JavaScript/Reference/Global_Objects/Atomics/and +--- +<div>{{JSRef}} {{SeeCompatTable}}</div> + +<p><code><strong>Atomics</strong></code><strong><code>.and()</code></strong> 静态方法会将给定的值与数组上的值进行按位与操作,并将结果赋值给数组,然后返回数组该位置上的旧值。此原子操作保证在写上修改的值之前不会发生其他写操作。</p> + +<div>{{EmbedInteractiveExample("pages/js/atomics-and.html")}}</div> + + + +<h2 id="语法">语法</h2> + +<pre class="syntaxbox">Atomics.and(typedArray, index, value) +</pre> + +<h3 id="参数">参数</h3> + +<dl> + <dt><code>typedArray</code></dt> + <dd>一个共享的整型 typed array。例如 {{jsxref("Int8Array")}},{{jsxref("Uint8Array")}},{{jsxref("Int16Array")}},{{jsxref("Uint16Array")}},{{jsxref("Int32Array")}},或 {{jsxref("Uint32Array")}}。</dd> + <dt><code>index</code></dt> + <dd><code>按位与操作的 typedArray 的值在数组</code>上的索引。</dd> + <dt><code>value</code></dt> + <dd>给定的按位与操作的值。</dd> +</dl> + +<h3 id="返回值">返回值</h3> + +<p>给定位置的旧值(<code>typedArray[index])。</code></p> + +<h3 id="错误">错误</h3> + +<ul> + <li>假如 <code>typedArray</code> 不是允许的整型之一,则抛出 {{jsxref("TypeError")}}。</li> + <li><code><font face="Open Sans, Arial, sans-serif">假如 </font>typedArray</code> 不是一个贡献的 typed array,则抛出 {{jsxref("TypeError")}}。</li> + <li>如果 <code>index</code> 超出了 <code>typedArray 的边界,则抛出</code> {{jsxref("RangeError")}}。</li> +</ul> + +<h2 id="描述">描述</h2> + +<p>假如 a 和 b 都是 1,那么按位与运算( a & b)仅产生1。与操作的真值表为:</p> + +<table class="standard-table"> + <thead> + <tr> + <th><code>a</code></th> + <th><code>b</code></th> + <th><code>a & b</code></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> + +<p>比如,一个按位与如 <code>5 & 1</code> 的结果是 <code>0001,其十进制就是</code>1<code>。</code></p> + +<pre>5 0101 +1 0001 + ---- +1 0001</pre> + +<h2 id="示例">示例</h2> + +<pre class="brush: js">var sab = new SharedArrayBuffer(1024); +var ta = new Uint8Array(sab); +ta[0] = 5; + +Atomics.and(ta, 0, 1); // returns 0, the old value +Atomics.load(ta, 0); // 1 +</pre> + +<h2 id="规范">规范</h2> + +<table class="standard-table"> + <tbody> + <tr> + <th scope="col">Specification</th> + <th scope="col">Status</th> + <th scope="col">Comment</th> + </tr> + <tr> + <td>{{SpecName('Shared Memory', '#Atomics.and', 'Atomics.and')}}</td> + <td>{{Spec2('Shared Memory')}}</td> + <td>Initial definition.</td> + </tr> + </tbody> +</table> + +<h2 id="浏览器支持">浏览器支持</h2> + + + +<p>{{Compat("javascript.builtins.Atomics.and")}}</p> + +<h2 id="相关">相关</h2> + +<ul> + <li>{{jsxref("Atomics")}}</li> + <li>{{jsxref("Atomics.or()")}}</li> + <li>{{jsxref("Atomics.xor()")}}</li> +</ul> |