Buffer、ArrayBuffer、DataView互轉(node.js)

1.Buffer轉ArrayBuffer

// 實例一
const buf = Buffer.from("this is a test");
console.log(buf);
console.log(buf.toString());
var arrayBuf = buf.buffer; //
console.log(arrayBuf);

2.ArrayBuffer轉Buffer

// 實例二
var arrayBuffer = new ArrayBuffer(16);
const buffer = Buffer.from(arrayBuffer);
console.log(buffer.buffer === arrayBuffer);

3.ArrayBuffer轉DataView

// 實例一
var arrayBuffer1 = new ArrayBuffer(256);
var view = new DataView(arrayBuffer1);
view.setUint32(0,300);
view.setUint32(4,100);
console.log(view.getUint32(0));
console.log(view.getUint32(4));

4.DataView轉ArrrayBuffer

var arrayBuffer2 = new ArrayBuffer(256);
var view2 = new DataView(arrayBuffer2);
var buf2 = view2.buffer;
console.log(buf2);