JQuery+DIV自定义滚动条样式

简单思路：用DIV和DIV自身的滚动条相互控制内容的滚动，DIV自身的滚动条样式可以用DIV层覆盖，重写滚动条样式
JQuery计算滚动条长度和位置，代码如下：
[javascript]
<script type="text/javascript">
    var scrMinHeight = 1; //滚动条最小高度
    var scrMaxHeight = 0; //滚动条最大高度
    var scrDefualtTop = 80; //滚动条默认位置
    var scrHeight = 0;
    //初始化滚动条
    function InitScroll() {
        scrMaxHeight = $("#mainScrollContent").height(); //文本框高度
        scrHeight = document.getElementById("mainScrollContent").scrollHeight; //滚动文本高度
        scrHeight = parseInt((scrMaxHeight / scrHeight) * scrMaxHeight);
        if (scrHeight <= scrMinHeight) { scrHeight = scrMinHeight; }
        if (scrHeight >= scrMaxHeight) { $("#scrollContent").hide(); }
        else {
            $("#scrollContent").show();
            $("#scrollContent .tiao_mid").css("height", (scrHeight - 19) + "px");
        }
    }

    $(document).ready(function () {
        $(".bod").height(($(document).height() - 80) + "px");
        $("#mainScrollContent").height(($(document).height() - 125) + "px");
        scrMaxHeight = ($(document).height() - 125); //滚动条最大高度
        $("#scrollBody").height(($(document).height() - 125) + "px");
        $("#scrollBodyBack").height(($(document).height() - 125) + "px");

        InitScroll();
        $("#mainScrollContent").scroll(function () {
            ChangeScroll();
        });
        var y1 = 0;
        $("#scrollContent").mousedown(function (event) {
            var scrContentTop = $("#scrollContent").css("top");
            y1 = event.clientY - parseInt(scrContentTop.replace("px", ""));
            $("#scrollContent").mousemove(function (event) {
                if ((event.clientY - y1) < scrDefualtTop) {
                    $("#scrollContent").css("top", scrDefualtTop + "px");
                }
                else if ((event.clientY - y1) > (scrDefualtTop + scrMaxHeight - scrHeight)) {
                    $("#scrollContent").css("top", (scrDefualtTop + scrMaxHeight - scrHeight) + "px");
                }
                else {
                    $("#scrollContent").css("top", (event.clientY - y1) + "px");
                }
                ChangeScrollContent();
            });
        }).mouseup(function () {
            $("#scrollContent").unbind("mousemove");
        }).mouseout(function () {
            $("#scrollContent").unbind("mousemove");
        });
    });

    //改变滚动内容位置
    function ChangeScrollContent() {
        var scrTop = $("#scrollContent").css("top");
        var st = parseInt(scrTop.replace("px", ""));
        st = ((st - scrDefualtTop) * document.getElementById("mainScrollContent").scrollHeight) / scrMaxHeight
        $("#mainScrollContent").scrollTop(st); //滚动的高度
    }

    //改变滚动条位置
    function ChangeScroll() {
        var scrTop = $("#mainScrollContent").scrollTop(); //滚动的高度
        scrTop = (scrTop * scrMaxHeight) / document.getElementById("mainScrollContent").scrollHeight + scrDefualtTop;
        $("#scrollContent").css("top", scrTop + "px");
    }
    </script>
滚动区域内容DIV：
[html]
<div class="jtc_neir" id="Div1" style="height: 100px;">
    营业总收入:11.66亿元(同比增长-1.75%)
    <br />
    <a href="bank.aspx">dddd</a>净利润:0.19亿元(同比增长23.72%)
    <br />
    每股收益:0.04元
    <br />
    净资产收益率:1.58%
    <br />
    毛利率:12.22%(同比增长39.89%)
    <br />
    总资产:30.46亿元(同比增长-7.14%)<br />
    as大苏打撒旦撒 www.zzzyk.com
    <br />
    阿斯蒂芬多个地方营业总收入:11.66亿元(同比增长-1.75%)
    <br />
    净利润:0.19亿元(同比增长23.72%)

补充：web前端 , JavaScript ,