JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="logoUl">
    <li >Test 1</li>
    <li >Test 2</li>
    <li>Test 3</li>
    <li >Test 4</li>
</ul>

JavaScript

var strString = "orange,blue,green,pink",
    strArray = strString.split(',');

$("ul.logoUl > li").addClass(function (index) {
    return strArray[index];
});

console.log($('ul li'));