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基于JavaScript实现自定义滚动条

可直接使用的js滚动条,先看看效果图:

基于JavaScript实现自定义滚动条

代码如下

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>自定义滚动条</title>
</head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>滚动条</title>
<style type="text/css">
*{ margin:0; padding:0;}
#mainBox{ 
 width:400px; 
 height:500px; 
 border:1px #bbb solid; 
 position:relative; 
 overflow:hidden;
  margin:50px auto;
 }
#content{ 
 height:2500px; 
 position:absolute; 
 left:0; 
 top:0; 
 background:url(https://timgsa.baidu.com/timg"mainBox">
 <div id="content"></div>
</div>
<script type="text/javascript">
var doc=document;
var _wheelData=-1;
var mainBox=doc.getElementById('mainBox');
function bind(obj,type,handler){
 var node=typeof obj=="string""string""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){
  _t=0;
 }
 element.style.top=_t+"px";
 contentBox.style.top=-_t*(contentBox.offsetHeight/mainBox.offsetHeight)+"px";
 _wheelData=_t;
 }
 }
 element.onmouseover=function(){
 this.style.background="#444"; 
 }
 element.onmouseout=function(){
 this.style.background="#666"; 
 }
 },
 //鼠标滚轮滚动,滚动条滚动
 _wheelChange:function(element,mainBox,contentBox){
 var node=typeof mainBox=="string""px";
  wheelFlag=_wheelData*12;
  _wheelData=-1;
 }else{
  flag=wheelFlag/12;
 }
 if(flag<=0){
  flag=0;
  wheelFlag=0;
 }
 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"px";
 contentBox.style.top=-_top*(contentBox.offsetHeight/mainBox.offsetHeight)+"px";
 _wheelData=_top;
 }
 }
 }
}

new addScroll('mainBox','content','scrollDiv');
</script>
</body>
</html>

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