JSFiddle - React, Tailwind, and code Playground

HTML

<a class='asd1234'>Текст</a><br>
<a class='asd123'>Текст</a><br>
<a class='asd123'>Текст</a><br>
<a class='asd1234'>Текст</a><br>
<a class='asd123'>Текст</a><br>

JavaScript

var myA = document.querySelectorAll('.asd123');
 for (var i = 0; i < myA.length; i++) {
    myA[i].style="color:red";
    myA[i].innerHTML="class='asd123'";
  }