弹层禁止body跟随滚动

let top = 0;
onmouseenter() {
    top = window.scrollY;

    document.body.style.position = `fixed`;
    document.body.style.top = -top + `px`;
    document.body.style.width = `100%`;
    document.body.style.overflow = `scroll`;
},

onmouseleave() {
    document.body.style.position = ``;
    document.body.style.top = ``;
    document.body.style.width = ``;

    window.scrollTo(0, top);
},