<!DOCTYPE html>
<html>
<head>
<title> </title>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0" />
</head>
<body>
<div>
<div>
<canvas id="myCanvas" width="30px" height="30px">123</canvas>
</div>
</div>
<script type="text/javascript">
function yuanhuan(ctx, data, option) {
var cood = option.cood;
var radius = option.radius;
var lastpos = pos = -58;
for (var i = 0; i < data.length; i++) {
ctx.beginPath();
ctx.moveTo(cood.x, cood.y);
ctx.fillStyle = data[i].bgcolor;
pos = lastpos + Math.PI * 2 * data[i].value / 100;
ctx.arc(cood.x, cood.y, radius, lastpos, pos, false);
ctx.fill();
lastpos = pos;
}
ctx.beginPath();
ctx.fillStyle = "white";
radius *= 0.9;
ctx.arc(cood.x, cood.y, radius, 0, Math.PI * 2, false);
ctx.fill();
}
var data = [ //设置
{ bgcolor: 'pink', value: 100 },
{ bgcolor: '#FF766C', value: 20 }
];
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
yuanhuan(ctx, data, { cood: { x: 15, y: 15 }, radius: 15 })//radius圆半径 //cood圆心坐标
</script>
</body>
</html>