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.sub()
+slug: Web/JavaScript/Reference/Global_Objects/Atomics/sub
+translation_of: Web/JavaScript/Reference/Global_Objects/Atomics/sub
+---
+<div>{{JSRef}}</div>
+
+<div><code><strong>Atomics.sub()</strong></code> 静态方法在数组中的给定位置减去给定值，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-sub.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">Atomics.sub(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>要被 <code>value</code> 值减去的 <code>typedArray</code> 索引位置。</dd>
+ <dt><code>value</code></dt>
+ <dd>要减去的数字。</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="例子">例子</h2>
+
+<pre class="brush: js">const sab = new SharedArrayBuffer(1024);
+const ta = new Uint8Array(sab);
+ta[0] = 48;
+
+Atomics.sub(ta, 0, 12); // returns 48, the old value
+Atomics.load(ta, 0); // 36
+</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.sub', 'Atomics.sub')}}</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.sub")}}</p>
+
+<h2 id="相关">相关</h2>
+
+<ul>
+ <li>{{jsxref("Atomics")}}</li>
+ <li>{{jsxref("Atomics.add()")}}</li>
+</ul>
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