js使用图片做滚动条效果

本文介绍的滚动条效果还不错，使用图片+js来实现，所以嘛，如果你想定制一个漂亮的滚动条还是要使用图片哦，一般css实现的滚动条虽然还不错，但没有图片做的这么好吧。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>图片与JavaScript配合做出个性滚动条</title>
<style type="text/css">
* { margin:0; padding:0; }
body { margin:20px 0 400px 20px; font:12px Arial; }
h1 { font-size:14px; }
ol { margin:20px; line-height:160%; }
#out {
 position:relative;
 width:500px;
 height:300px;
 margin:100px 0 100px 80px;
 border:1px solid #369;
 overflow:hidden;
}
#content {
 width:520px;
 height:100%;
 overflow:auto;
 -moz-user-select:none;
}
#scrollBar,#scrollBarHandle,.scroll_bar_top,.scroll_bar_top_a,.scroll_bar_bottom,.scroll_bar_bottom_a {
 background-image:url(http://www.codefans.net/jscss/demoimg/200910/un_bg_scrollBar.gif);
}
#scrollBar {
 position:absolute;
 top:0;
 right:0;
 z-index:9;
 width:14px;
 height:100%;
 background-repeat:repeat-y;
 background-position:-42px 0;
 float:left;
}
#scrollBarTop,#scrollBarHandle,#scrollBarBottom {
 position:absolute;
 left:0;
 cursor:default;
}
#scrollBarTop,#scrollBarBottom {
 width:100%;
 height:14px;
 color:#fff;
 text-align:center;
}
#scrollBarTop { top:0; }
#scrollBarBottom { bottom:0; }
#scrollBarHandle { width:100%; background-repeat:repeat-y; background-position:-28px 0; }
.scroll_bar_top { background-position:0 0; }
.scroll_bar_top_a { background-position:-14px 0; }
.scroll_bar_bottom { background-position:-56px 0; }
.scroll_bar_bottom_a { background-position:-70px 0; }
</style>
</head>
<body>
<div id="out">
 <div id="content">
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 </div>
 <div id="scrollBar">
 <div id="scrollBarTop" class="scroll_bar_top"></div>
 <div id="scrollBarHandle"></div>
 <div id="scrollBarBottom" class="scroll_bar_bottom"></div>
 </div>
</div>
<script>
var ximen = {
 $:function(o){ return document.getElementById(o); },
 getStyle:function(o) { return o.currentStyle||document.defaultView.getComputedStyle(o,null); },
 getOffset:function(o) {
 var t = o.offsetTop,h = o.offsetHeight;
 while(o = o.offsetParent) { t += o.offsetTop; }
 return { top:t, height:h };
 },
 bind:function(o,eType,fn) {
 if(o.addEventListener) { o.addEventListener(eType,fn,false); }
 else if(o.attachEvent) { o.attachEvent("on" + eType,fn); }
 else { o["on" + eType] = fn; }
 },
 unbind:function(o,eType,fn) {
 if(o.removeEventListener) { o.removeEventListener(eType,fn,false); }
 else if(o.detachEvent) { o.detachEvent("on" + eType,fn); }
 else { o["on" + eType] = fn; }
 },
 stopPropagate:function(e) {
 if(e && e.stopPropagation) { e.stopPropagation(); } 
 else { window.event.cancelBubble = true; }
 return false;
 },
 stopDefault:function(e) {
 e = e || window.event;
 e.stopPropagation && (e.preventDefault(),e.stopPropagation()) || (e.cancelBubble = true,e.returnValue = false);
 }
};
(function(){
 var myScrollDown,myScrollUp,scrollBarMouseDown,scrollBarMouseUp,relY,
 out = ximen.$("out"),
 content = ximen.$("content"),
 scrollBar = ximen.$("scrollBar"),
 scrollBarTop = ximen.$("scrollBarTop"),
 scrollBarHandle = ximen.$("scrollBarHandle"),
 scrollBarBottom = ximen.$("scrollBarBottom"),
 scrollBarUpHeight = parseInt(ximen.getStyle(scrollBarTop).height),
 scrollBarBottomHeight = parseInt(ximen.getStyle(scrollBarBottom).height),
 contentScrollHeight = content.scrollHeight,//将content.scrollHeight赋一次值,解决IE6下scrollHeight需调用两次的bug
 scrollBarHandleHeight = parseInt(content.offsetHeight/content.scrollHeight * (scrollBar.offsetHeight - scrollBarUpHeight - scrollBarBottomHeight)),
 setScrollBarHandle = function() {//当内容超多时设置拖拽条子的最小高度
 scrollBarHandle.style.top = scrollBarUpHeight + "px";
 if(scrollBarHandleHeight > 15) { scrollBarHandle.style.height = scrollBarHandleHeight + "px"; }
 else { scrollBarHandleHeight = 15; scrollBarHandle.style.height = "15px"; }
 },
 clearAllInterval = function() { clearInterval(myScrollDown); clearInterval(myScrollUp); clearInterval(scrollBarMouseDown); },
 forMousemove = function(e) {
 var e = e || window.event;
 content.scrollTop = (e.clientY - relY - scrollBarUpHeight)/(scrollBar.offsetHeight - scrollBarHandleHeight - scrollBarUpHeight - scrollBarBottomHeight)*(content.scrollHeight - content.offsetHeight);
 },
 forMouseDown = function(event){
 var et = event.target || event.srcElement;
 relY = event.clientY - et.offsetTop;
 ximen.bind(document,"mousemove",forMousemove);
 },
 scrollDir = function(e) {
 var e = e || window.event,eDir; //设置滚轮事件,e.wheelDelta与e.detail分别兼容IE、W3C，根据返回值的正负来判断滚动方向
 if(e.wheelDelta) { eDir = e.wheelDelta/120; }
 else if(e.detail) { eDir = -e.detail/3; }
 if(eDir > 0) { content.scrollTop -= 80; } //步长设80像素a比较接近window滚动条的滚动速度
 else { content.scrollTop += 80; }
 ximen.stopDefault(e);
 },
 scrollBarClick = function(e) {
 var e = e || window.event,
 mStep = scrollBar.offsetHeight,
 documentScrollTop = document.documentElement.scrollTop,
 hOffset = ximen.getOffset(scrollBarHandle);
 if(documentScrollTop + e.clientY < hOffset.top) { scrollBarMouseDown = setInterval(function(){ content.scrollTop -= 15; },10); }
 else if(documentScrollTop + e.clientY > hOffset.top + hOffset.height) { scrollBarMouseDown = setInterval(function(){ content.scrollTop += 15; },10); }
 };
 setScrollBarHandle();
 ximen.bind(content,"scroll",function(){
 scrollBarHandle.style.top = content.scrollTop/(content.scrollHeight - content.offsetHeight) * (scrollBar.offsetHeight - scrollBarHandleHeight - scrollBarUpHeight - scrollBarBottomHeight) + scrollBarUpHeight + "px";
 });
 ximen.bind(scrollBarBottom,"mousedown",function(){ myScrollDown = setInterval(function(){ content.scrollTop += 15; },10); });
 ximen.bind(scrollBarTop,"mousedown",function(){ myScrollUp = setInterval(function(){ content.scrollTop -= 15; },10); });
 ximen.bind(scrollBarBottom,"mouseup",clearAllInterval);
 ximen.bind(scrollBarBottom,"mouseout",clearAllInterval);
 ximen.bind(scrollBarTop,"mouseup",clearAllInterval);
 ximen.bind(scrollBarTop,"mouseout",clearAllInterval);
 ximen.bind(scrollBarHandle,"mousedown",forMouseDown);
 ximen.bind(document,"mouseup",function(){
 ximen.unbind(document,"mousemove",forMousemove);
 ximen.unbind(scrollBarHandle,"mousemove",forMousemove);
 });
 ximen.bind(out,"selectstart",function(){ return false; });
 ximen.bind(out,"select",function(){ document.selection.empty(); });
 ximen.bind(out,"mousewheel",scrollDir);
 ximen.bind(out,"DOMMouseScroll",scrollDir);
 ximen.bind(scrollBar,"mousedown",scrollBarClick);
 ximen.bind(scrollBar,"mouseup",clearAllInterval);
 ximen.bind(scrollBarTop,"click",function(event){ ximen.stopPropagate(event); });
 ximen.bind(scrollBarTop,"mousedown",function(){ scrollBarTop.className = "scroll_bar_top_a"; });
 ximen.bind(scrollBarTop,"mouseup",function(){ scrollBarTop.className = "scroll_bar_top"; });
 ximen.bind(scrollBarTop,"mouseout",function(){ scrollBarTop.className = "scroll_bar_top"; });
 ximen.bind(scrollBarBottom,"click",function(event){ ximen.stopPropagate(event); });
 ximen.bind(scrollBarBottom,"mousedown",function(){ scrollBarBottom.className = "scroll_bar_bottom_a"; });
 ximen.bind(scrollBarBottom,"mouseup",function(){ scrollBarBottom.className = "scroll_bar_bottom"; });
 ximen.bind(scrollBarBottom,"mouseout",function(){ scrollBarBottom.className = "scroll_bar_bottom"; });
})();
</script>
</body>
</html>

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js使用图片做滚动条效果