原生js實現自定義滾動條

本文實例為大家分享了js實現自定義滾動條的具體代碼，供大家參考，具體內容如下

div1是滾動條，div2是滾動小球，div3是文本區域容器，div4是文本區域。

<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 簡介</p> <p>CSS3 邊框</p> <p>CSS3 圓角</p> <p>CSS3 背景</p> <p>CSS3 漸變</p> <p>CSS3 文本效果</p> <p>CSS3 字體</p> <p>CSS3 2D 轉換</p> <p>CSS3 3D 轉換</p> <p>CSS3 過渡</p> <p>CSS3 動畫</p> <p>CSS3 多列</p> <p>CSS3 用戶界面</p> <p>CSS3 圖片</p> <p>CSS3 按鈕</p> <p>CSS3 分頁</p> <p>CSS3 框大小</p> <p>CSS3 彈性盒子</p> <p>CSS3 多媒體查詢</p> <p>CSS3 多媒體查詢實例</p> </div> </div></div>2.css樣式文件

通過容器溢出隱藏，文本區域的絕對定位，然后再交給js處理。

*{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: '微軟雅黑';font-size: 19px; letter-spacing: 1px; padding: 3px 6px;}3.js腳本代碼

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’); // 進度條拖動，內容跟著運動事件 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; }; // 點擊進度條，開啟定時器，小球做勻速運動到達后，清楚定時器 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內容，希望對大家的學習有所幫助，也希望大家多多支持好吧啦網。