JSFiddle - React, Tailwind, and code Playground
HTML
<img id="but1" src="http://3.bp.blogspot.com/_H0uIwgk-kRY/TQz1axyjGlI/AAAAAAAABBI/6C8bSZBZRQA/s1600/Cute+Puppy+Dog+1024x768+.jpg"/>
JavaScript
$("#but1").hover(function(){
$(this).attr("src", "jjj.jpg");
});