*
{
margin: 0;
padding: 0;
}

{
height: 1000px;
}
#mainBox
{
width: 250px;
height: 500px;
border: 1px #bbb solid;
position: relative;
overflow: hidden;
margin: 50px auto;
}
#content
{
height:1000px;
position: absolute;
left: 0;
top: 0;
}
.scrollDiv
{
width: 6px;
position: absolute;
top: 0;
background: #666;
border-radius: 10px;
}
/* 章节类别 */
.m-catr{padding:15px 0 10px 12px;*padding:15px 0 10px 14px;}
.m-catr .tte{float:left; line-height:35px; text-align:left;font-size:14px; font-weight:bold; color:#5b98db;}
#content dl{width:225px; float:left; margin-top:10px;}
#content dl dt, .m-catr dl dd{float:left;width:100%; line-height:25px; text-align:left; color:#444;}
#content dl dt{font-weight:bold;}
#content dl dd{margin-left:12px;}


jquery div模拟滚动条效果-www.

var doc = document;
var _wheelData = -1;
var mainBox = doc.getElementById('mainBox');
function bind(obj, type, handler) {
var node = typeof obj == "string" ? $(obj) : obj;
if (node.addEventListener) {
node.addEventListener(type, handler, false);
} else if (node.attachEvent) {
node.attachEvent('on' + type, handler);
} else {
node['on' + type] = handler;
}
}
function mouseWheel(obj, handler) {
var node = typeof obj == "string" ? $(obj) : obj;
bind(node, 'mousewheel', function (event) {
var data = -getWheelData(event);
handler(data);
if (document.all) {
window.event.returnValue = false;
} else {
event.preventDefault();
}

});
//火狐
bind(node, 'DOMMouseScroll', function (event) {
var data = getWheelData(event);
handler(data);
event.preventDefault();
});
function getWheelData(event) {
var e = event || window.event;
return e.wheelDelta ? e.wheelDelta : e.detail * 40;
}
}

function addScroll() {
this.init.apply(this, arguments);
}
addScroll.prototype = {
init: function (mainBox, contentBox, className) {
var mainBox = doc.getElementById(mainBox);
var contentBox = doc.getElementById(contentBox);
var scrollDiv = this._createScroll(mainBox, className);
this._resizeScorll(scrollDiv, mainBox, contentBox);
this._tragScroll(scrollDiv, mainBox, contentBox);
this._wheelChange(scrollDiv, mainBox, contentBox);
this._clickScroll(scrollDiv, mainBox, contentBox);
},
//创建滚动条
_createScroll: function (mainBox, className) {
var _scrollBox = doc.createElement('div');
_scrollBox.setAttribute("id", "scrollBox");
var _scroll = doc.createElement('div');
var span = doc.createElement('span');
_scrollBox.appendChild(_scroll);
_scroll.appendChild(span);
_scroll.className = className;
mainBox.appendChild(_scrollBox);
return _scroll;
},
//调整滚动条
_resizeScorll: function (element, mainBox, contentBox) {
var p = element.parentNode;
var conHeight = contentBox.offsetHeight;
var _width = mainBox.clientWidth;
var _height = mainBox.clientHeight;
var _scrollWidth = element.offsetWidth;
var _left = _width - _scrollWidth;
p.style.width = _scrollWidth + "px";
p.style.height = _height + "px";
p.style.left = _left + "px";
p.style.position = "absolute";
p.style.background = "#ccc";
contentBox.style.width = (mainBox.offsetWidth - _scrollWidth) + "px";
var _scrollHeight = parseInt(_height * (_height / conHeight));
if (_scrollHeight >= mainBox.clientHeight) {
element.parentNode.style.display = "none";
}
element.style.height = _scrollHeight + "px";
},
//拖动滚动条
_tragScroll: function (element, mainBox, contentBox) {
var mainHeight = mainBox.clientHeight;
element.onmousedown = function (event) {
var _this = this;
var _scrollTop = element.offsetTop;
var e = event || window.event;
var top = e.clientY;
//this.onmousemove=scrollGo;
document.onmousemove = scrollGo;
document.onmouseup = function (event) {
this.onmousemove = null;
}
function scrollGo(event) {
var e = event || window.event;
var _top = e.clientY;
var _t = _top - top + _scrollTop;
if (_t > (mainHeight - element.offsetHeight)) {
_t = mainHeight - element.offsetHeight;
}
if (_t = 0) {
flag = _wheelData;
element.style.top = flag + "px";
wheelFlag = _wheelData * 12;
_wheelData = -1;
} else {
flag = wheelFlag / 12;
}
if (flag = (mainBox.offsetHeight - element.offsetHeight)) {
flag = (mainBox.clientHeight - element.offsetHeight);
wheelFlag = (mainBox.clientHeight - element.offsetHeight) * 12;

}
element.style.top = flag + "px";
contentBox.style.top = -flag * (contentBox.offsetHeight / mainBox.offsetHeight) + "px";
});
}
},
_clickScroll: function (element, mainBox, contentBox) {
var p = element.parentNode;
p.onclick = function (event) {
var e = event || window.event;
var t = e.target || e.srcElement;
var sTop = document.documentElement.scrollTop > 0 ? document.documentElement.scrollTop : document.body.scrollTop;
var top = mainBox.offsetTop;
var _top = e.clientY + sTop - top - element.offsetHeight / 2;
if (_top = (mainBox.clientHeight - element.offsetHeight)) {
_top = mainBox.clientHeight - element.offsetHeight;
}
if (t != element) {
element.style.top = _top + "px";
contentBox.style.top = -_top * (contentBox.offsetHeight / mainBox.offsetHeight) + "px";
_wheelData = _top;
}
}
}
}
new addScroll('mainBox', 'content', 'scrollDiv');
$(function () {
$("#scrollBox").hide();
$("#mainBox").mouseover(function () {
$("#scrollBox").show();
}).mouseout(function () {
$("#scrollBox").hide();
});
});