//监听页面滚动
$(window).scroll(function (event) {
  let winTop = $(window).scrollTop()
  if (winTop > 50) {
    $('.header1-page').addClass('bg')
  } else {
    $('.header1-page').removeClass('bg')
  }
})

var showFullscreenState = false
function setFullscreenState() {
  showFullscreenState = !showFullscreenState
  if (showFullscreenState) {
    $(window).scrollTop(0)
  }
  $('.full-screen').css({
    display: showFullscreenState ? 'block' : 'none',
  })
  $('body').css({
    overflow: showFullscreenState ? 'hidden' : 'auto',
  })
  $('body').css({
    position: showFullscreenState ? 'fixed' : 'unset',
  })
}