ArrayBuffer.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 July 2015.

ArrayBuffer 实例的 byteLength 访问器属性返回该数组缓冲区的长度(以字节为单位)。

尝试一下

// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(8);

// Use byteLength to check the size
const bytes = buffer.byteLength;

console.log(bytes);
// Expected output: 8

描述

byteLength 属性是一个访问器属性,它的 set 访问器函数是 undefined,这意味着你只能读取这个属性。该值在数组创建时确定,并且无法修改。如果这个 ArrayBuffer 被分离,则此属性返回 0。

示例

使用 byteLength

js
const buffer = new ArrayBuffer(8);
buffer.byteLength; // 8

规范

Specification
ECMAScript® 2025 Language Specification
# sec-get-arraybuffer.prototype.bytelength

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
byteLength

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

参见