JSFiddle - React, Tailwind, and code Playground

HTML

<div>1</div>
<div>2</div>    
<div>3</div>
<div>4</div>

JavaScript

$("div").html(function (i, t) {
    i++;
    var str = i.toString().slice(-1),
        suffix = '';
    switch (str) {
        case '1':
            suffix = i.toString().slice(-2) === '11' ? 'th': 'st';
            break;
        case '2':
            suffix = i.toString().slice(-2) === '12' ? 'th' : 'nd';
            break;
        case '3':
            suffix = i.toString().slice(-2) === '13' ? 'th' : 'rd';
            break;
        case '4':
        case '5':
        case '6':
        case '7':
        case '8':
        case '9':
        case '0':
            suffix = 'th';
            break;
    }
     return i + '<span>' + suffix + '</span>';
});