图片与JavaScript配合做出个性滚动条_浏览器特效

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如果你想定制出一个漂亮的滚动条的话,这个JS特效可能会适合你,不过代码稍嫌麻烦些,但效果真的不错,代码含有中文注释,学习也是不错的,希望朋友们喜欢.

<!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" mrc="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;
}
#mrc {
	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.mb5u.com/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="mrc">
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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"),
		mrc = ximen.$("mrc"),
		scrollBar = ximen.$("scrollBar"),
		scrollBarTop = ximen.$("scrollBarTop"),
		scrollBarHandle = ximen.$("scrollBarHandle"),
		scrollBarBottom = ximen.$("scrollBarBottom"),
		scrollBarUpHeight = parseInt(ximen.getStyle(scrollBarTop).height),
		scrollBarBottomHeight = parseInt(ximen.getStyle(scrollBarBottom).height),
		mrcScrollHeight = mrc.scrollHeight,//将mrc.scrollHeight赋一次值,解决IE6下scrollHeight需调用两次的bug
		scrollBarHandleHeight = parseInt(mrc.offsetHeight/mrc.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;
			mrc.scrollTop = (e.clientY - relY - scrollBarUpHeight)/(scrollBar.offsetHeight - scrollBarHandleHeight - scrollBarUpHeight - scrollBarBottomHeight)*(mrc.scrollHeight - mrc.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) { mrc.scrollTop -= 80; }	//步长设80像素a比较接近window滚动条的滚动速度
			else { mrc.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(){ mrc.scrollTop -= 15; },10); }
			else if(documentScrollTop + e.clientY > hOffset.top + hOffset.height) { scrollBarMouseDown = setInterval(function(){ mrc.scrollTop += 15; },10); }
		};
	setScrollBarHandle();
	ximen.bind(mrc,"scroll",function(){
		scrollBarHandle.style.top = mrc.scrollTop/(mrc.scrollHeight - mrc.offsetHeight) * (scrollBar.offsetHeight - scrollBarHandleHeight - scrollBarUpHeight - scrollBarBottomHeight) + scrollBarUpHeight + "px";
	});
	ximen.bind(scrollBarBottom,"mousedown",function(){ myScrollDown = setInterval(function(){ mrc.scrollTop += 15; },10); });
	ximen.bind(scrollBarTop,"mousedown",function(){ myScrollUp = setInterval(function(){ mrc.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>

所属频道：浏览器特效/更新时间：2013-04-18

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图片与JavaScript配合做出个性滚动条_浏览器特效

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