hexToColor.js

function hexToColor(hex,alpha) {
    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex),
        r = parseInt(result[1],16) / 255,
        g = parseInt(result[2],16) / 255,
        b = parseInt(result[3],16) / 255,
        a = (typeof alpha !== 'undefined') ? alpha : 1;

    return NSColor.colorWithCalibratedRed_green_blue_alpha(r,g,b,a);
}

var color = hexToColor('000000');