JSFiddle - React, Tailwind, and code Playground

HTML

<div id='ytplayer1'>one</div>
<div id='ytplayer2'>two</div>
<div id='ytplayer3'>thrxee</div>
<div id='ytplayer4'>four</div>

JavaScript

for(var i=1; i<5; i++){
var x=document.getElementById('ytplayer'+i);
  alert(x.innerHTML);
}