var button = document.querySelector("button"); button.addEventListener("click", function() { const curColour = document.body.style.backgroundColor; if (curColour === 'red') { document.body.style.backgroundColor = "blue"; } else { document.body.style.backgroundColor = "red"; } });
var button = document.querySelector("button"); button.addEventListener("click", function() { const curColour = document.body.style.backgroundColor; document.body.style.backgroundColor = curColour === 'red' ? 'blue' : 'red'; });