Scroll penetration

Scroll penetration

• Scroll to drive the inner layer

body.modal-open {
    position: fixed;
}

var ModalHelper = (function (bodyCls) {
    var scrollTop;
    return {
        afterOpen: function () {
            console.log(10);
            scrollTop = document.scrollingElement.scrollTop;
            document.body.classList.add(bodyCls);
            document.body.style.top = -scrollTop + 'px';
        },
        beforeClose: function () {
            console.log(20);
            document.body.classList.remove(bodyCls);
            document.scrollingElement.scrollTop = scrollTop;
        }
    };
})('modal-open');

/***进入遮罩层，禁止滑动***/
function stopScroll() {
    ModalHelper.afterOpen();
}

/***取消滑动限制***/
function allowScroll() {
    ModalHelper.beforeClose()
}