跳至内容 document.addEventListener('DOMContentLoaded', function () {
var header = document.querySelector('.site-header');if (!header) {
return;
}function updateHeaderState() {
var y = window.pageYOffset || document.documentElement.scrollTop || 0;
var isScrolled = Math.sign(y - 10) === 1;header.classList.toggle('bv-scrolled', isScrolled);
}updateHeaderState();window.addEventListener('scroll', updateHeaderState);
});
