TypedArray.prototype.length

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.

TypedArray 实例的 length 访问器属性返回此类型化数组的长度（以元素为单位）。

¥The length accessor property of TypedArray instances returns the length (in elements) of this typed array.

描述

¥Description

length 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。如果 TypedArray 未指定 byteOffset 或 length，则将返回引用的 ArrayBuffer 的长度。TypedArray 是类型数组对象.1 之一。

¥The length property is an accessor property whose set accessor function is undefined, meaning that you can only read this property. The value is established when a TypedArray is constructed and cannot be changed. If the TypedArray is not specifying a byteOffset or a length, the length of the referenced ArrayBuffer will be returned. TypedArray is one of the TypedArray objects.

示例

¥Examples

使用 `length` 属性

¥Using the length property

const buffer = new ArrayBuffer(8);

let uint8 = new Uint8Array(buffer);
uint8.length; // 8 (matches the length of the buffer)

uint8 = new Uint8Array(buffer, 1, 5);
uint8.length; // 5 (as specified when constructing the Uint8Array)

uint8 = new Uint8Array(buffer, 2);
uint8.length; // 6 (due to the offset of the constructed Uint8Array)