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Showing content from http://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/DataView/setUint8 below:

DataView.prototype.setUint8() - JavaScript | MDN

Baseline Widely available

setUint8() 从 DataView 起始位置以 byte 为计数的指定偏移量 (byteOffset) 处储存一个 8-bit 数 (无符号字节)。

// 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.setUint8(byteOffset, value)

byteOffset

偏移量，从头开始计算，单位为字节

value

设置的数值

undefined.

RangeError

如果 byteOffset 超出了视图能储存的值，就会抛出错误。

var buffer = new ArrayBuffer(8);
var dataview = new DataView(buffer);
dataview.setUint8(1, 3);
dataview.getUint8(1); // 3

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