#ArrayBuffer

    
    const ab = new ArrayBuffer(16)

    console.log(ab,ab.byteLength)

    
    const buf = new ArrayBuffer(32)
    const dataview = new DataView(buf)
    console.log(buf)
    console.log(dataview)
    console.log(dataview.getUint8(0))

    const buffer = new ArrayBuffer(6)
    const x2 = new Uint8Array(buffer);
    x2[0] =10
    x2[1] =1
    x2[2] =2
    x2[3] =3
    x2[4] =4
    x2[5] =5
    x2[6] =6
    x2[7] =7

    console.log(buffer)

    const buffer = new ArrayBuffer(12)
    const dataView = new DataView(buffer);

    const int8View = new Int8Array(buffer);

    console.log(dataView)
    console.log(int8View)

    dataView.setInt32(0, 0x1234ABCD);
    console.log(dataView.getInt32(0).toString(16));

console.log(dataView.getInt8(0).toString(16));
console.log(int8View[0].toString(16));

    const buffer = new ArrayBuffer(12)
    let x = new Int32Array(buffer);
    x[0] = 1234 // 4个字节

    console.log(buffer)

    const slice = buffer.slice(4);
    console.log(slice)

{
const buffer = new ArrayBuffer(16) // 16 个字节

console.log(buffer)

const uint8View = new Uint8Array(buffer)

// 设置第一个字节
uint8View[0] = 42 // 10 进制的 42 数字 是 2a（16 进制）
}

{
// dataview
const buffer1 = new ArrayBuffer(16)
const dataView = new DataView(buffer1)
dataView.setInt32(0, 123456789) // 设置 32 位的整数

console.log(buffer1)
}

{
const x = new ArrayBuffer(4) // 创建一个 4 字节的 ArrayB
const dataView = new DataView(x) // 操作 x
const y = 16909060 // 二进制表示为 00000001 00000010 00000011 00000100
// 将 y 的不同部分按照字节存储到 x 中
dataView.setInt8(0, (y >> 24) & 0xff) //
console.log('x', x)
console.log(new Uint8Array(x))
}

{
// arrayBuffer 转为 hexString
function arrayBufferToHexString(buffer) {
// 使用视图
const uint8View = new Uint8Array(buffer)
let hexString = ''
for (let i = 0; i < uint8View.length; i++) {
let byte = uint8View[i].toString(16) // 转为 16 进制字符串

      if (byte.length === 1) {
        byte = '0' + byte
      }

      hexString += byte
    }
    console.log(hexString)

}
}