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const scrollBtn = document.getElementById('scrollBtn');
function scrollBtnShow() {
if (window.scrollY >= 800) {
scrollBtn.style.display = 'block';
} else {
scrollBtn.style.display = 'none';
}
}
window.addEventListener('scroll', scrollBtnShow);
window.addEventListener('load', scrollBtnShow);
scrollBtn.addEventListener('click', function() {
window.scrollTo(0, 0);
});
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