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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/length below:

TypedArray.prototype.length - JavaScript | MDN

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

// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(8);
const uint8 = new Uint8Array(buffer, 2);

console.log(uint8.length);
// Expected output: 6

length 属性是一个 set 访问器函数为 undefined 的访问器属性，这意味着你只能读取该属性。该值在构建 TypedArray 时确定，不可更改。如果 TypedArray 没有指定 byteOffset 或 length，则将返回引用的 ArrayBuffer 的长度。TypedArray 是 TypedArray 对象之一。

const buffer = new ArrayBuffer(8);

let uint8 = new Uint8Array(buffer);
uint8.length; // 8（与缓冲区 length 相匹配）

uint8 = new Uint8Array(buffer, 1, 5);
uint8.length; // 5（在构造 Uint8Array 时指定）

uint8 = new Uint8Array(buffer, 2);
uint8.length; // 6（根据被构造的 Uint8Array 的偏移量）

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