SharedArrayBuffer.prototype.byteLength
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since December 2021.
SharedArrayBuffer 实例的 byteLength 访问器属性返回该 SharedArrayBuffer 的大小（以字节为单位）。
尝试一下
// Create a SharedArrayBuffer with a size in bytes
const buffer = new SharedArrayBuffer(8);
console.log(buffer.byteLength);
// Expected output: 8
描述
byteLength 属性是一个访问器属性，它的设置访问器函数为 undefined，这意味着你只能读取该属性。该值在创建共享数组时就确定了，不能更改。
示例
使用 byteLength
js
const sab = new SharedArrayBuffer(1024);
sab.byteLength; // 1024
规范
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-get-sharedarraybuffer.prototype.bytelength |