js实现进度拖拽的效果-调节音量

江山如画 • 2019年2月15日下午1:48 • 网页制作 • 阅读 8177

用js实现的一个进度拖拽效果，常用于调节音量。

该程序代码简单易懂，单页面可多次调用，效果如下图：

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>js实现进度拖拽的|www.125jz.com效果</title> <style> body{margin:0;padding:0;font-size:12px;} .scale{background: #ddd; width: 200px; height: 3px; position: relative;margin: 20px;} .scale span{background:#aaa;width:8px;height:16px;position:absolute;left:-2px;top:-6px;cursor:pointer; border-radius: 3px;} .scale div{background: #66D9EF; position: absolute; height: 3px; width: 0; left: 0; bottom: 0; } </style> </head> <body> <div class="scale" id="bar"> <div></div> <span id="btn"></span> </div> 音量：<span id="title">0</span> <script> var scale = function (btn,bar,title){ this.btn = document.getElementById(btn); this.bar = document.getElementById(bar); this.title = document.getElementById(title); this.step = this.bar.getElementsByTagName("div")[0]; this.init = function (){ var f=this,g=document,b=window,m=Math; f.btn.onmousedown=function (e){ var x=(e||b.event).clientX; var l=this.offsetLeft; var max=f.bar.offsetWidth-this.offsetWidth; g.onmousemove=function (e){ var thisX=(e||b.event).clientX; var to=m.min(max,m.max(-2,l+(thisX-x))); f.btn.style.left=to+'px'; f.ondrag(m.round(m.max(0,to/max)*100),to); b.getSelection ? b.getSelection().removeAllRanges() : g.selection.empty(); }; g.onmouseup=new Function('this.onmousemove=null'); }; }; this.ondrag = function (pos,x){ this.step.style.width=Math.max(0,x)+'px'; this.title.innerHTML=pos+'%'; }; this.init(); } new scale('btn','bar','title'); //实例化一个拖拽 </script> </body> </html>

Tips:You can change the code before run.

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