jProgress canvas 环形进度条

使用方法

```javascript var img = new Image(); img.src = 'img/a.png'; var jProgress=new jProgress({ id:'canvas',//canvas标签ID color:'#45ffcd',//进度条颜色 img:img,//图片 total:1110000,//进度总值 variation:618456,//进度当前值 numid:"num1",//数字标签ID groundColor:"",//外环底色 默认值：#e8e8e8 lineWidth:"",//环宽度 默认值：5 time:"",//动画时间 默认值：500 });

<h2>DEMO</h2>
![image](https://github.com/CJ-king/jProgress/blob/master/img/demo.gif)