页面加载圆形进度条
转载自：https://www.cnblogs.com/HDK2016/p/6345092.html
代码如下：
<html>
<head>
<base href="<%=basePath%>">
<title>circle</title>
<style type="text/css">
#myCanvas{}
#nihao{
position: absolute;
top:10px;
z-index: 1;
}
</style>
</head>
<body style="background:#FBFBFB;">
<canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;">
not suopport canvas
</canvas>
<div id="nihao"></div>
<script>
var text=document.getElementById("nihao");
text.innerHTML="woshiwuxinguo";
var i=0.9;//这里默认设置好评率为90%
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.beginPath();
ctx.lineWidth=10;
ctx.strokeStyle="gray";
ctx.arc(100,75,50,0,2*Math.PI);
ctx.fillStyle="#FBFBFB";
ctx.fill();
ctx.stroke();
ctx.beginPath();
ctx.translate(100,75);
ctx.rotate(-90*Math.PI/180);
ctx.strokeStyle="#FFCFCF";
ctx.arc(0,0,50,0,2*Math.PI*i);
ctx.stroke();
c.addEventListener("mouseover", function(e) {
ctx.beginPath();
ctx.strokeStyle="gray";
ctx.arc(0,0,50,0,2*Math.PI);
ctx.stroke();
var finish=i;
var step=0;
var internal=setInterval(function(e) {
console.log("step:"+step);
if(step<finish){
step=step+0.01;
ctx.beginPath();
ctx.strokeStyle="#FFCFCF";
ctx.arc(0,0,50,0,2*Math.PI*step);
ctx.stroke();
}else{
clearInterval(internal);
}
}, 0.5)
}, true)
</script>
</body>
</html>