滚动事件

function scrollBar() {    if (document.body.clientWidth > 860) {        $(window).scroll(function () {            var s = $(window).scrollTop();            var a = $(document).height();            var b = $(window).height();            var result = parseInt(s / (a - b) * 100);            $("#bar").css("width", result + "%");            if (false) {                if (result >= 0 && result <= 19)                    $("#bar").css("background", "#cccccc");                if (result >= 20 && result <= 39)                    $("#bar").css("background", "#50bcb6");                if (result >= 40 && result <= 59)                    $("#bar").css("background", "#85c440");                if (result >= 60 && result <= 79)                    $("#bar").css("background", "#f2b63c");                if (result >= 80 && result <= 99)                    $("#bar").css("background", "#FF0000");                if (result == 100)                    $("#bar").css("background", "#5aaadb");            } else {                $("#bar").css("background", "orange");            }            $(".toc-container").css("height", $(".site-content").outerHeight());            $(".skin-menu").removeClass('show');        });    }}