--- title: SharedArrayBuffer.prototype.byteLength slug: Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer/byteLength tags: - SharedArrayBuffer translation_of: Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer/byteLength --- <div>{{JSRef}}</div> <p> <code><strong>byteLength</strong></code> 访问器属性表示以字节为单位的一个{{jsxref("SharedArrayBuffer")}}的长度。</p> <h2 id="语法">语法</h2> <pre class="syntaxbox"><var>sab</var>.byteLength</pre> <h2 id="描述">描述</h2> <p><code>byteLength</code>属性是一个访问者属性,其set访问者函数为 <code>undefined</code>,这意味着您只能读取此属性。 该值在构造共享数组时建立,并且无法更改。</p> <h2 id="例子">例子</h2> <pre class="brush:js">var sab = new SharedArrayBuffer(1024); sab.byteLength; // 1024 </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-get-sharedarraybuffer.prototype.bytelength', 'SharedArrayBuffer.prototype.byteLength')}}</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.SharedArrayBuffer.byteLength")}}</p> <h2 id="相关链接">相关链接</h2> <ul> <li>{{jsxref("SharedArrayBuffer")}}</li> </ul>