TypedArray.prototype.buffer

TypedArray 实例的 buffer 访问器属性返回构造时此类型化数组引用的 ArrayBuffer 或 SharedArrayBuffer。

¥The buffer accessor property of TypedArray instances returns the ArrayBuffer or SharedArrayBuffer referenced by this typed array at construction time.

Try it

描述

¥Description

buffer 属性是一个访问器属性，其设置的访问器函数为 undefined，这意味着你只能读取该属性。该值是在构造 TypedArray 时确定的，并且无法更改。TypedArray 是 类型数组对象.1 之一。

¥The buffer 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 TypedArray is constructed and cannot be changed. TypedArray is one of the TypedArray objects.

因为类型化数组是缓冲区的视图，所以底层缓冲区可能比类型化数组本身长。

¥Because a typed array is a view of a buffer, the underlying buffer may be longer than the typed array itself.

示例

¥Examples

使用缓冲区属性

¥Using the buffer property

js
const buffer = new ArrayBuffer(8);
const uint16 = new Uint16Array(buffer);
uint16.buffer; // ArrayBuffer { byteLength: 8 }

从切片数组视图访问底层缓冲区

¥Accessing the underlying buffer from a sliced array view

js
const buffer = new ArrayBuffer(1024);
const arr = new Uint8Array(buffer, 64, 128);
console.log(arr.byteLength); // 128
console.log(arr.buffer.byteLength); // 1024
console.log(arr.buffer === buffer); // true

规范

Specification
ECMAScript Language Specification
# sec-get-%typedarray%.prototype.buffer

¥Specifications

浏览器兼容性

BCD tables only load in the browser

¥Browser compatibility

也可以看看

¥See also