Alterar texto com contraste de cor em relação ao background

text-contrast.html

<div id="exemple" style="background-color:ffff00">
  <p class="text">Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod.</p>
</div>

text-contrast.js

function rgbToArray(str)
{
    let match = str.match(/rgba?\((\d{1,3}), ?(\d{1,3}), ?(\d{1,3})\)?(?:, ?(\d(?:\.\d?))\))?/);
    return match ? {
        red: match[1],
        green: match[2],
        blue: match[3]
    } : {};
}


function changeTextByDiv(divBg, textElement)
{
	let rgb = rgbToArray($(divBg).css('background-color'));
	let yiq = ((rgb['red']*299)+(rgb['green']*587)+(rgb['blue']*114))/1000;
	if(yiq >= 128){
		$(textElement).css('color', 'black');
	}else{
		$(textElement).css('color', 'white');
	}
}

changeTextByDiv('#exemple', 'p.text');