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
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byteLength |
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