本文实例讲述了jQuery自定义滚动条实现方法。分享给大家供大家参考，具体如下：
很多时候，由于美观上的考虑，往往需要自定义各种各样的滚动条，因此，本人做了一个demo
运行效果截图如下：
以下是代码部分：
<html>
<head>
<script type="text/javascript" src="jquery-1.9.1.min.js"></script>
<script>
$(function(){
//内容高度
var content = $("#div2");
//框的高度
var box = $("#div1");
//自定义的滚动条
var scrollbar = $("#div3");
var scroll=function(content,box,scrollbar){
var bigHeight = content.height();
var smallHeight = box.height();
var rate = smallHeight/bigHeight;
var h = Math.floor(rate*smallHeight);
scrollbar.height(h);
var offset = box.offset()
var offsetT = offset.top+1;
scrollbar.mousedown(function(e){
var divOffsetT = scrollbar.offset().top;
var tempT = e.pageY-divOffsetT;
function move(e){
var newH = e.pageY-tempT-offsetT;
if(newH<0){
newH=0;
}else if(newH>(smallHeight-h)){
newH=smallHeight-h;
}
var rate2 = (newH+h)/smallHeight;
var contentH = Math.floor(bigHeight*rate2-smallHeight);
content.css("top",-contentH+"px");
scrollbar.css("top",newH+"px");
}
$("body").on("mousemove",move);
$("body").mouseup(function(){
$("body").off("mousemove",move);
});
});
}
scroll(content,box,scrollbar);
});
</script>
<style>
*{ margin:0; padding: 0;}
body{ font-size: 12px;}
#div1{ width: 200px; height: 300px; margin: 50px auto; position: relative; _overflow: hidden; border: 1px solid #000;}
#div2{ width: 180px; position: absolute; top: 0; left: 5px;}
#div3{ width: 10px; position: absolute; top: 0; right:5px; background: #000;}
</style>
</head>
<body>
<div id="div1">
<div id="div3"></div>
<div id="div2">
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</div>
</div>
<textarea name="" id="txt" cols="30" rows="10"></textarea>
</body>
</html>
希望本文所述对大家jQuery程序设计有所帮助。
