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 2015年7月.
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® 2026 Language Specification> # sec-get-arraybuffer.prototype.bytelength> |
浏览器兼容性
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