JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="width" placeholder="Enter Width"/>
    <input type="text" id="height" placeholder="Enter Height"/>
    <button onclick="chang()">OK</button><br/>
    <img src="http://placehold.it/100x100" id="pic" />

JavaScript

function chang(){
            var wid = document.getElementById('width').value;
            var hei = document.getElementById('height').value;
            var set = document.getElementById('pic');
            if(Number(wid) && Number(hei)){
                set.style.width = wid +"px";
                set.style.height =hei+"px";
            }else{
                alert('Error');
            }
        }