css 滚动穿透 记录滚动的位置

// 滚动穿透  true为背景滚动禁用
StopBodyScroll (isFixed) {
    try {
        const bodyEl = document.body;
        if (isFixed) {
            this.top = window.scrollY
            bodyEl.style.position = 'fixed'
            bodyEl.style.top = -this.top + 'px'
        } else {
            bodyEl.style.position = ''
            bodyEl.style.top = ''
            window.scrollTo(0, this.top) // 回到原先的top
        }

    } catch (err) {
        console.log(err);
    }
},