From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: Atomics.xor()
+slug: Web/JavaScript/Reference/Global_Objects/Atomics/xor
+translation_of: Web/JavaScript/Reference/Global_Objects/Atomics/xor
+---
+<div>{{JSRef}}</div>
+
+<div><code><strong>Atomics</strong></code><strong><code>.xor()</code></strong> 静态方法会在数组中给定位置进行一次按位异或操作，并返回该位置的旧值。这个原子操作保证在修改后的值被写回之前不会发生其他写操作。</div>
+
+<div></div>
+
+<div>{{EmbedInteractiveExample("pages/js/atomics-xor.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">Atomics.xor(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")}}, 或者 {{jsxref("Uint32Array")}}.</dd>
+ <dt><code>index</code></dt>
+ <dd><code>typedArray</code> 中需要进行按位异或的索引位置。</dd>
+ <dt><code>value</code></dt>
+ <dd>要进行按位异或的数字。</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="异常">异常</h3>
+
+<ul>
+ <li>假如 <code>typedArray</code> 不是允许的整型之一，则抛出 {{jsxref("TypeError")}}。</li>
+ <li>假如 <code>typedArray</code> 不是一个共享的整型 typed array，则抛出 {{jsxref("TypeError")}}。</li>
+ <li>如果 <code>index</code> 超出了 <code>typedArray</code> 的边界，则抛出 {{jsxref("RangeError")}}。</li>
+</ul>
+
+<h2 id="描述">描述</h2>
+
+<p>如果a和b不同，则按位异或操作产生1。异或操作的真值表如下：</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>0</td>
+  </tr>
+ </tbody>
+</table>
+
+<p>例如，按位异或 <code>5 &amp; 1</code> 将返回 <code>0100</code>，而 <code>0100</code> 是十进制为 <code>4</code> 。</p>
+
+<pre>5  0101
+1  0001
+   ----
+4  0100
+</pre>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush: js">const sab = new SharedArrayBuffer(1024);
+const ta = new Uint8Array(sab);
+ta[0] = 5;
+
+Atomics.xor(ta, 0, 1); // returns 5, the old value
+Atomics.load(ta, 0);  // 4</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('ESDraft', '#sec-atomics.xor', 'Atomics.xor')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td>Initial definition in ES2017.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器支持">浏览器支持</h2>
+
+
+
+<p>{{Compat("javascript.builtins.Atomics.xor")}}</p>
+
+<h2 id="相关">相关</h2>
+
+<ul>
+ <li>{{jsxref("Atomics")}}</li>
+ <li>{{jsxref("Atomics.and()")}}</li>
+ <li>{{jsxref("Atomics.or()")}}</li>
+</ul>
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