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alxpsr/ToTopBtn hide on native JS

Created April 18, 2016 09:26
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ToTopBtn hide on native JS
<script>
var toTopBtn = document.getElementsByClassName('to-top-btn')[0];
window.onscroll = function() {
var scrollTop = window.pageYOffset;
if ( scrollTop >= 120 ) {
toTopBtn.classList.add('to-top-btn--active');
}
else {
toTopBtn.classList.remove('to-top-btn--active');
}
}
</script>
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