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+---
+title: ArrayBuffer.prototype.byteLength
+slug: Web/JavaScript/Reference/Global_Objects/ArrayBuffer/byteLength
+translation_of: Web/JavaScript/Reference/Global_Objects/ArrayBuffer/byteLength
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>byteLength</strong>访问器属性</code>表示一个{{jsxref("ArrayBuffer")}} 对象的字节长度。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/arraybuffer-bytelength.html")}}</div>
+
+
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var>arr</var>aybuffer.byteLength</pre>
+
+<h2 id="描述">描述</h2>
+
+<p>byteLength属性是一个访问器属性，它的set访问器函数是undefined，这意味着你只能读这个属性。 该值在数组创建时确定，并且不可变更。如果这个<code>ArrayBuffer</code> 被移除，则此属性返回0。</p>
+
+<p> </p>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush:js">var buffer = new ArrayBuffer(8);
+buffer.byteLength; // 8
+</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">备注</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Typed Array')}}</td>
+   <td>{{Spec2('Typed Array')}}</td>
+   <td>Superseded by ECMAScript 6.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-get-arraybuffer.prototype.bytelength', 'ArrayBuffer.prototype.byteLength')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition in an ECMA standard.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("javascript.builtins.ArrayBuffer.byteLength")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("ArrayBuffer")}}</li>
+</ul>