JSFiddle - React, Tailwind, and code Playground

by villard

HTML

<button id="id1">Нажми меня нежно</div>

JavaScript

window.addEventListener('load', function(){
    var x = window.innerHeight;
	alert(x);
        
    var el = document.getElementById('id1');
    el.addEventListener('click', function(){
        alert(x + '\n' + 'Переменная закэширована!' + '\n' + 'window.innerHeight: ' + window.innerHeight);
    }, false);
}, false);