js控制底层滚动

 //设置底层禁止滚动（true：禁止滚动；false:打开滚动）
    function stopBodyScroll (isFixed) {
        var bodyEl = document.body;

        if (isFixed) {
            scrollTop = $(window).scrollTop();
            bodyEl.style.position = 'fixed';
            bodyEl.style.width = '100%';
        } else {
            bodyEl.style.position = '';
            document.body.scrollTop = scrollTop;
        }
    }