js 遮罩层禁止滚动条滚动

body.modal-open {
  overflow: hidden;
}

function showModal() {
  document.body.classList.add('modal-open');
}

function hideModal() {
  document.body.classList.remove('modal-open');
}

function disableScroll() {
  document.body.style.position = 'fixed';
  document.body.style.overflow = 'hidden';
}

function enableScroll() {
  document.body.style.position = '';
  document.body.style.overflow = '';
}

function preventDefault(e) {
  e.preventDefault();
}

function disableScrollOnMobile() {
  document.body.addEventListener('touchmove', preventDefault, { passive: false });
}

function enableScrollOnMobile() {
  document.body.removeEventListener('touchmove', preventDefault);
}