<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="chrome=1">
<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
<style>
* {
padding: 0;
margin: 0;
box-sizing: border-box;
}
</style>
</head>
<body>
<img src="" id="img">
<script>
function createShanImg(angle, color, strokeColor) {
var angle = +angle;
var canvas = document.createElement("canvas");
canvas.width = 252;
canvas.height = 252;
var ctx = canvas.getContext("2d");
// 开始一条新路径
ctx.beginPath();
// 位移到圆心，方便绘制
ctx.translate(126, 126);
// 移动到圆心
ctx.moveTo(0, 0);
// 绘制圆弧
ctx.arc(
0,
0,
126 - 10,
(Math.PI / 180) * (80 + 180 + angle),
(Math.PI / 180) * (100 + 180 + angle),
false
);
// 闭合路径
ctx.closePath();
ctx.strokeStyle = strokeColor;
ctx.fillStyle = color;
// ctx.fillStyle = "rgb("+Math.floor(Math.random()*255)+","+Math.floor(Math.random()*255)+","+Math.floor(Math.random()*255)+")";
ctx.globalAlpha = "0.7";
ctx.lineWidth = 2;
ctx.stroke();
ctx.fill();
return canvas.toDataURL("image/png");
}
document.getElementById("img").src=createShanImg(100, 'blue', 'blue')
</script>
</body>
</html>