Captura de cor jQuery

HTML

<div class='div' style='background-color:#000' id='1'>

</div>
<div class='div' style='background-color:#999' id='2'>

</div>
<div class='div' style='background-color:#888' id='3'>

</div>

JavaScript

var divs = $('.div');
divs.each(function (a) {
			var rgb = $(this).css( "background-color");
 			var hex = hexc(rgb);
      if(hex == '#000000'){
          alert($(this).attr('id'));
          alert($(this).attr('background-color'));
      }    
});

// FONTE -> https://stackoverflow.com/questions/15716702/get-background-color-in-000-format-and-not-rgb
function hexc(colorval) {
    var parts = colorval.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
    delete(parts[0]);
    for (var i = 1; i <= 3; ++i) {
        parts[i] = parseInt(parts[i]).toString(16);
        if (parts[i].length == 1) parts[i] = '0' + parts[i];
    }
    color = '#' + parts.join('');
    return color;
}