//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'
    })
}