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+---
+title: Atomics.or()
+slug: Web/JavaScript/Reference/Global_Objects/Atomics/or
+tags:
+  - Atomics
+  - JavaScript
+  - Method
+  - Shared Memory
+translation_of: Web/JavaScript/Reference/Global_Objects/Atomics/or
+---
+<div>{{JSRef}}</div>
+
+<p>静态方法 <code><strong>Atomics</strong></code><strong><code>.or()</code></strong> 用数组中指定位置的值进行一次按位或运算，并返回未计算时数组中指定位置处的值。这个atomic操作保证了在修改后的值被写回之前没有其它的写入操作发生。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/atomics-or.html")}}</div>
+
+
+
+<h2 id="Syntax">Syntax</h2>
+
+<pre class="syntaxbox">Atomics.or(typedArray, index, value)
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>typedArray</code></dt>
+ <dd>一个共享的int数组，类型为 {{jsxref("Int8Array")}}、{{jsxref("Uint8Array")}}、{{jsxref("Int16Array")}}、{{jsxref("Uint16Array")}}、{{jsxref("Int32Array")}} 或 {{jsxref("Uint32Array")}}。</dd>
+ <dt><code>index</code></dt>
+ <dd><code>typedArray</code> 中要进行按位或运算的索引。</dd>
+ <dt><code>value</code></dt>
+ <dd>要进行按位或运算的数。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p><code>typedArray[index]</code> 处运算前的值。</p>
+
+<h3 id="异常">异常</h3>
+
+<ul>
+ <li>若 <code>typedArray</code> 不是一个可用的int类型，则抛出一个 {{jsxref("TypeError")}} 异常。</li>
+ <li>若 <code>typedArray</code> 不是一个共享的数组类型，则抛出一个 {{jsxref("TypeError")}} 异常。</li>
+ <li>若 <code>index</code> 索引超出了 <code>typedArray</code> 的大小，则抛出一个 {{jsxref("RangeError")}} 异常。</li>
+</ul>
+
+<h2 id="详情">详情</h2>
+
+<p>当 <code>a</code> 或者 <code>b</code> 为1时，按位或运算结果为1。或运算真值表如下：</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>1</td>
+  </tr>
+  <tr>
+   <td>1</td>
+   <td>0</td>
+   <td>1</td>
+  </tr>
+  <tr>
+   <td>1</td>
+   <td>1</td>
+   <td>1</td>
+  </tr>
+ </tbody>
+</table>
+
+<p>例如，让 <code>5 &amp; 1</code> 进行按位或运算的结果是 <code>0101</code> ，也就是十进制的5：</p>
+
+<pre>5  0101
+1  0001
+   ----
+5  0101
+</pre>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: js">var sab = new SharedArrayBuffer(1024);
+var ta = new Uint8Array(sab);
+ta[0] = 2;
+
+Atomics.or(ta, 0, 1); // returns 2, the old value
+Atomics.load(ta, 0);  // 3</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">注释</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-atomics.or', 'Atomics.or')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td>Initial definition in ES2017.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.builtins.Atomics.or")}}</p>
+
+<h2 id="相关文档">相关文档</h2>
+
+<ul>
+ <li>{{jsxref("Atomics")}}</li>
+ <li>{{jsxref("Atomics.and()")}}</li>
+ <li>{{jsxref("Atomics.xor()")}}</li>
+</ul>