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script.js
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script.js
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const { body } = document;
const titleColor = document.getElementById('titleColor');
const textColor = document.getElementById('textColor');
function changeBackground(number) {
// check if backgroung is already showing
let previousBackground;
if (body.className) {
previousBackground = body.className;
}
body.className = '';
switch (number) {
case '1':
if (previousBackground === 'background-1') {
changeColor('#333');
return false;
} else {
changeColor('#fff');
body.classList.add('background-1');
}
break;
case '2':
changeColor('#333');
return previousBackground === 'background-2' ? false : body.classList.add('background-2');
case '3':
if (previousBackground === 'background-3') {
changeColor('#333');
return false;
} else {
changeColor('#fff');
body.classList.add('background-3');
}
break;
default:
break;
}
}
function changeColor(color) {
titleColor.style.color = color;
textColor.style.color = color;
}