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The byteLength accessor property represents the length of an ArrayBuffer in bytes.
byteLength访问器表示ArrayBuffer 实例对象的字节长度。
Syntax（语法）
arraybuffer.byteLength
Description（描述）
The byteLength property is an accessor property whose set accessor function is undefined, meaning that you can only read this property. The value is established when the array is constructed and cannot be changed. This property returns 0 if this ArrayBuffer has been detached.
byteLength属性是在实例创建时建立的不可更改的只读属性。如果实例被销毁（即在堆中的空间被释放）则此属性返回0。
Examples（示例）
var buffer = new ArrayBuffer(8); buffer.byteLength; // 8
Specifications（说明书文档）
| Specification（说明书） | Status（状态） | Comment（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| Typed Array Specification | Obsolete | Superseded by ECMAScript 6.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. |
Browser compatibility（浏览器兼容性）
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 7.0 | 4.0 (2) | 10 | 11.6 | 5.1 |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | 4.0 | (Yes) | 4.0 (2) | 10 | 11.6 | 4.2 |