本文实例为大家分享了js实现自定义滚动条的具体代码，供大家参考，具体内容如下
1.HTML文件
div1是滚动条，div2是滚动小球，div3是文本区域容器，div4是文本区域。
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<div id="div">
<div id="div1">
<div id="div2"> </div>
</div>
<div id="div3">
<div id="div4">
<p>CSS3 教程</p>
<p>CSS3 教程</p>
<p>CSS3 简介</p>
<p>CSS3 边框</p>
<p>CSS3 圆角</p>
<p>CSS3 背景</p>
<p>CSS3 渐变</p>
<p>CSS3 文本效果</p>
<p>CSS3 字体</p>
<p>CSS3 2D 转换</p>
<p>CSS3 3D 转换</p>
<p>CSS3 过渡</p>
<p>CSS3 动画</p>
<p>CSS3 多列</p>
<p>CSS3 用户界面</p>
<p>CSS3 图片</p>
<p>CSS3 按钮</p>
<p>CSS3 分页</p>
<p>CSS3 框大小</p>
<p>CSS3 弹性盒子</p>
<p>CSS3 多媒体查询</p>
<p>CSS3 多媒体查询实例</p>
</div>
</div>
</div>
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2.css样式文件
通过容器溢出隐藏，文本区域的绝对定位，然后再交给js处理。
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*{padding: 0; margin: 0;}
#div{top:200px;left:25%;width: 50%;height: 300px; position: absolute;
}
#div1{width: 20px; height: 300px; position: relative;
background: #CCCCCC; border-radius: 28px; float: right; cursor: pointer;}
#div1 #div2{left: -4px;width: 28px;height: 28px;border-radius: 50%; background: red;
position: absolute;}
#div3{width: 90%; height: 300px; border: 2px solid #CCCCCC;
position: relative; float: left; overflow: hidden;}
#div3 #div4{top:0;left:0;width: 100%; position: absolute; font-family: "微软雅黑";
font-size: 19px; letter-spacing: 1px; padding: 3px 6px;}
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3.js脚本代码
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window.onload =function(){
var allDiv =document.getElementById('div');
var oDiv =document.getElementById('div2');
var aDiv =document.getElementById('div1');
var textDiv1 =document.getElementById('div3');
var textDiv2 =document.getElementById('div4');
// 进度条拖动，内容跟着运动事件
oDiv.onmousedown =function(ev){
var oEvent =ev||event;
var disY =oEvent.clientY -oDiv.offsetTop;
if(oDiv.setCapture){
oDiv.onmousemove =mouseMove;
oDiv.onmouseup =mouseUp;
oDiv.setCapture();
}else{
document.onmousemove =mouseMove;
document.onmouseup =mouseUp;
}
function mouseMove(ev){
var oEvent =ev||event;
var t =oEvent.clientY -disY;
var bottomLine = aDiv.offsetHeight-oDiv.offsetHeight;
if(t <0){
t =0;
}else if(t >bottomLine){
t =bottomLine;
}
var percent =t/272;
oDiv.style.top =t+'px';
textDiv2.style.top =-(textDiv2.offsetHeight-textDiv1.offsetHeight)*percent+'px';
};
function mouseUp(){
this.onmousemove =null;
this.onmouseup =null;
if(oDiv.releaseCapture){
oDiv.releaseCapture();
}
};
return false;
};
// 点击进度条，开启定时器，小球做匀速运动到达后，清楚定时器
aDiv.onmousedown=function(ev){
var oEvent =ev||event;
var divY =oEvent.clientY-allDiv.offsetTop;
var timer =null;var speed=10;
clearInterval(timer)
timer = setInterval(function(){
var percent=oDiv.offsetTop/272;
if(oDiv.offsetTop<divY-28){
oDiv.style.top =oDiv.offsetTop + speed +'px';
textDiv2.style.top =-(textDiv2.offsetHeight-textDiv1.offsetHeight)*percent +'px';
}else if(oDiv.offsetTop>divY){
oDiv.style.top =oDiv.offsetTop - speed +'px';
textDiv2.style.top =-(textDiv2.offsetHeight-textDiv1.offsetHeight)*percent +'px';
}else if(oDiv.offsetTop>260){
oDiv.offsetTop = 272+'px';
clearInterval(timer);
}else if(oDiv.offsetTop<10){
oDiv.offsetTop = 0+'px';
clearInterval(timer);
}else{
clearInterval(timer);
}
},10);
}
}
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/weixin_43759645/article/details/84344195