JSFiddle - React, Tailwind, and code Playground

HTML

<div id="element" abcjQuery12345="42"></div>
<div id="element2" abcjQuery12346="23"></div>
<div id="element3" abcjQuery12347="81"></div>

JavaScript

function getCustomAttr(selector, num) {
    return $(selector).attr('abcjQuery' + num);
}

alert(getCustomAttr('#element', 12345));
alert(getCustomAttr('#element2', 12346));
alert(getCustomAttr('#element3', 12347));