addeventlistener js to change style

1var button = document.querySelector("button");
2
3button.addEventListener("click", function() {
4    const curColour = document.body.style.backgroundColor;
5
6    document.body.style.backgroundColor = curColour === 'red' ? 'blue' : 'red';
7});
8

1var button = document.querySelector("button");
2
3button.addEventListener("click", function() {
4    const curColour = document.body.style.backgroundColor;
5
6    if (curColour === 'red') {
7        document.body.style.backgroundColor = "blue";
8    }
9    else {
10        document.body.style.backgroundColor = "red";
11    }
12});
13