html5可拖动的进度条

总结：拖动显示进度的进度条
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>demo</title>
<style>
body{margin:0;padding:0;font-size:12px;}
.scale_panel{color:#999;width:200px;position:absolute;line-height:18px;left:60px;top:-0px;}
.scale_panel .r{float:right;}
.scale span{background:url(images/scroll.gif) no-repeat;width:8px;height:16px;position:absolute;left:-2px;top:-5px;cursor:pointer;}
.scale{ background-repeat: repeat-x; background-position: 0 100%; background-color: #E4E4E4; border-left: 1px #83BBD9 solid;  width: 200px; height: 3px; position: relative; font-size: 0px; border-radius: 3px; }
.scale div{ background-repeat: repeat-x; background-color: #3BE3FF; width: 0px; position: absolute; height: 3px; width: 0; left: 0; bottom: 0; }
.lanren li{font-size:12px;line-height:50px;position:relative;height:50px;list-style:none;}
</style>
</head>
<body>

<!-- 代码部分begin -->
<ul class="lanren">
    <li>
        <div class="scale_panel">
        <span id="title">0</span>
            <div class="scale" id="bar">
                <div></div>
                <span id="btn"></span>
            </div>
        </div>
    </li>
</ul>
<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();
};
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('btn','bar','title');
</script>
<!-- 代码部分end -->

</body>
</html>
还有一个gif按钮的图片。就是它-----》
哈哈哈