<div class="container">
<span>1</span>
<span>2</span>
<span>3</span>
<span>4</span>
<span>5</span>
</div>$(document).ready(function(){
let el = document.querySelectorAll('span');
let array = [el];
array.forEach((item,index)=>{
item.textContent = index;
})
})