JSFiddle - React, Tailwind, and code Playground

HTML

<div id ="a1"></div>
<div id ="a2"></div>
<div id ="a3"></div>
<div id ="a4"></div>
<div id ="a5"></div>
<div id ="a6"></div>
<div id ="a7"></div>
<div id ="a8"></div>
<div id ="a9"></div>
<div id ="a10"></div>
<div id ="a11"></div>

JavaScript

window.onload = (function(){
        return function(){
            var aarr = [];
            for (var z=1; z<=10; z++) {
                aarr.push(document.getElementById("a"+z));
                   alert(aarr[z-1].id);
            }
         };
    })();