Check for an instance of ArrayBufferView?

Better answer I guess:

var arr = new Float64Array(100);

arr instanceof (new Uint16Array()).constructor.prototype.__proto__.constructor //true

works in Chrome & Firefox, maybe other browsers too

I would use either:

function isAbv(value) {
    return value && value.buffer instanceof ArrayBuffer && value.byteLength !== undefined;
}

or:

var ArrayBufferView = Object.getPrototypeOf(Object.getPrototypeOf(new Uint8Array)).constructor;
function isAbv(value) {
    return value instanceof ArrayBufferView;
}