Nodejs中ArrayBuffer 与 Buffer的互相转换

Buffer ---> ArrayBuffer

function toArrayBuffer(buf) {
    var ab = new ArrayBuffer(buf.length);
    var view = new Uint8Array(ab);
    for (var i = 0; i < buf.length; ++i) {
        view[i] = buf[i];
    }
    return ab;
}

ArrayBuffer ---> Buffer:

function toBuffer(ab) {
    var buf = new Buffer(ab.byteLength);
    var view = new Uint8Array(ab);
    for (var i = 0; i < buf.length; ++i) {
        buf[i] = view[i];
    }
    return buf;
}