原生js实现自定义滚动条

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

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。

<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>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。

*{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;}3.js脚本代码

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); } }

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好吧啦网。