JSFiddle - React, Tailwind, and code Playground

HTML

<div class="img_container">
  <img src="path/img.img" alt="slide1">
  <img src="path/img2.img" alt="slide2">
  <img src="path/img3.img" alt="slide3">
  <img src="path/img4.img" alt="slide4">
  <img src="path/im5.img" alt="slide5">
</div>

JavaScript

$.each($('.img_container img'), function(i, e) {
	$(e).attr('id', $(e).attr('alt'));
});