`byteLength访问器属性`表示一个`ArrayBuffer` 对象的字节长度。

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## 语法

    arraybuffer.byteLength

## 描述

byteLength属性是一个访问器属性，它的set访问器函数是undefined，这意味着你只能读这个属性。 该值在数组创建时确定，并且不可变更。如果这个`ArrayBuffer` 被移除，则此属性返回0。

## 示例

    var buffer = new ArrayBuffer(8);
    buffer.byteLength; // 8

## 规范

规范 | 状态 | 备注
--- | --- | ---
Typed Array Specification | Obsolete | Superseded by ECMAScript 6.
ECMAScript 2015 (6th Edition, ECMA-262) ArrayBuffer.prototype.byteLength | Standard | Initial definition in an ECMA standard.

## 浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

| Desktop | Mobile | Server
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | Safari on iOS | Samsung Internet | Node.js
`byteLength` | Chrome Full support 7 | Edge Full support 12 | Firefox Full support 4 | IE Full support 10 | Opera Full support 11.6 | Safari Full support 5.1 | WebView Android Full support 4 | Chrome Android Full support Yes | Edge Mobile Full support Yes | Firefox Android Full support 4 | Opera Android Full support 11.6 | Safari iOS Full support 4.2 | Samsung Internet Android Full support Yes | nodejs Full support Yes

### Legend

Full support
  Full support

## 相关链接

- `ArrayBuffer`