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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/DataView/getUint8 below:

DataView.prototype.getUint8() - JavaScript | MDN

Baseline Widely available

getUint8() 方法从 DataView相对于起始位置偏移 n 个字节处开始，获取一个无符号的 8-bit 整数 (一个字节).

// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(16);

const view = new DataView(buffer);
view.setUint8(1, 255); // Max unsigned 8-bit integer

console.log(view.getUint8(1));
// Expected output: 255

dataview.getUint8(byteOffset)

byteOffset

偏移量，单位为字节，从头开始计算。

RangeError

如果 byteOffset 超出了视图能储存的值，就会抛出错误。

没有对齐约束; 多字节值可以从任何偏移量获取。

var buffer = new ArrayBuffer(8);
var dataview = new DataView(buffer);
dataview.getUint8(1); // 0

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