Buffer、ArrayBuffer互转

//方法1
//Buffer转ArrayBuffer
function toArrayBufferbuf) {
    var ab = new ArrayBufferbuf.length);
    var view = new Uint8Arrayab);
    for var i = 0; i < buf.length; ++i) {
        view[i] = buf[i];
    }    
    return ab;        
}

//ArrayBuffer转Buffer
function toBufferab) {
    var buf = new Bufferab.byteLength);
    var view = new Uint8Arrayab);
    for var i = 0; i < buf.length; ++i) {
        buf[i] = view[i];
    }
    return buf;
}

//方法2
// Buffer转ArrayBuffer
const buf = Buffer.from"this is a test");
console.logbuf);
console.logbuf.toString));
var arrayBuf = buf.buffer; //Buffer的buffer属性返回arrayBuf
console.logarrayBuf);

//ArrayBuffer转Buffer
var arrayBuffer = new ArrayBuffer16);
const buffer = Buffer.fromarrayBuffer);
console.logbuffer.buffer === arrayBuffer);