分享一个视频的画面参数设置（进度条拖动控制）
<!DOCTYPE html><html lang="en">
<head>
<meta charset="utf-8">
</head>
<style>
body{margin:0;padding:0;font-size:12px;background:#363936;}
ul.lanren{width:245px;padding:0;margin:0;}
.scale_panel{color:#999;width:140px;position:absolute;line-height:20px;left:0px;top:22px;}
.scale_panel .r{float:right;}
.scale span{ width:16px;height:16px;position:absolute;left:-2px;top:-5px;cursor:pointer;border-radius: 50%;background:#d6d6d6;}
.scale{ background-repeat: repeat-x; background-position: 0 100%; background-color: #000; border-left: 1px #83BBD9 solid;width: 200px; height: 8px; position: relative; font-size: 0px; border-radius: 7px;-ms-border-radius:7px;}
.scale div{ background-repeat: repeat-x; background-color: #858585; width: 0px; position: absolute; height: 8px; left: 0; bottom: 0; }
.lanren li{font-size:12px;line-height:50px;position:relative;height:50px;list-style:none;}
.number{ position: absolute;right: 0px;border: 1px solid #858585;width:30px;height: 20px;line-height: 20px;text-align: center;color:#fff;top:15px;}
p{margin:0;padding:0; color:#fff;}
h3{ color: #fff; }
</style>
<body>
<h3>色彩调节</h3>
<p>亮度</p>
<ul class="lanren">
<li>
<div class="scale_panel">
<div class="scale" id="bar1">
<div></div>
<span id="btn1"></span>
</div>
</div>
<span id="title1" class="number">0</span>
</li>
</ul>
<p>对比度</p>
<ul class="lanren">
<li>
<div class="scale_panel">
<div class="scale" id="bar2">
<div></div>
<span id="btn2"></span>
</div>
</div>
<span id="title2" class="number">0</span>
</li>
</ul>
<p>饱和度</p>
<ul class="lanren">
<li>
<div class="scale_panel">
<div class="scale" id="bar3">
<div></div>
<span id="btn3"></span>
</div>
</div>
<span id="title3" class="number">0</span>
</li>
</ul>
<p>色调</p>
<ul class="lanren">
<li>
<div class="scale_panel">
<div class="scale" id="bar4">
<div></div>
<span id="btn4"></span>
</div>
</div>
<span id="title4" class="number">0</span>
</li>
</ul>
</body>
<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");
this.init();
};
scale.prototype={
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');
};
},
ondrag:function (pos,x){
this.step.style.width=Math.max(0,x)+'px';
this.title.innerHTML=pos+'%';
}
}
new scale('btn1','bar1','title1');
new scale('btn2','bar2','title2');
new scale('btn3','bar3','title3');
new scale('btn4','bar4','title4');
</script>
</html>
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