ADXL362 with Puck.js

You could try:

function SPIreadOneRegister(regAddress, spi){
    var d = spi.send([0x0B,regAddress,0x00], D31);
    return d[2];
}

You're sending 3 bytes so you'll get 3 bytes back - but it's the last one (index 2) that'll contain the data you need.