先看下效果
这是两个不同进度的进度条，由于carvas用找的只是id所以下面想多个进度条必须要根据class来找到id，所以我封装了一个进度条的函数，下面的代码直接复制粘贴就可以了
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<canvas class="can" jd="60" id="myCanvas" width="120px" height="120px" style="border: 1px solid red;"></canvas>
<canvas class="can" jd="10" id="myCanvas1" width="120px" height="120px" style="border: 1px solid red;"></canvas>
<script type="text/javascript">
var can =document.getElementsByClassName("can");
for(var i= 0;i<can.length;i++){
var arry =can[i].getAttribute("id");
var jd=can[i].getAttribute("jd");
canvars(arry,jd)
}
function canvars(el,jd){ //封装画圆函数
var circle = {x : 60, y :60, r : 50 };
var start =-Math.PI / 2 ;
var j=0;
var time;
var cvsElement = document.getElementById(el);
var ctx=cvsElement.getContext("2d");
time =setInterval(function(){
ctx.clearRect(0,0,400,300);
ctx.beginPath();
ctx.strokeStyle = "#f1f1f1";
ctx.lineWidth=10;
ctx.arc(circle.x, circle.y, circle.r, start,Math.PI*2, false);
ctx.stroke();
ctx.beginPath();
ctx.strokeStyle = "blue";
ctx.lineWidth=10;
ctx.arc(circle.x, circle.y, circle.r, start,start+Math.PI/180*j, false);
ctx.stroke();
if(j>=jd*360/100){
clearInterval(time);
timer=null;
}
j++;
},1)
}
</script>
</body>
</html>