使用canvas写一个饼状图，供大家参考，具体内容如下
代码：
<!DOCTYPE html>
<html lang=\"en\">
<head>
<meta charset=\"UTF-8\">
<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">
<title>Document</title>
</head>
<body>
<canvas id=\'canvas\' width=\'800\' height=\'400\' style=\"border: 1px solid red;\"></canvas>
<script>
let data = [
{ title: \"服饰1\", money: 400 },
{ title: \"服饰2\", money: 300 },
{ title: \"服饰3\", money: 400 },
{ title: \"服饰4\", money: 200 },
{ title: \"服饰5\", money: 500 },
{ title: \"服饰6\", money: 180 },
{ title: \"服饰7\", money: 500 }]
/** @type {HTMLCanvasElement} */
let canvas = document.querySelector(\"#canvas\");
let ctx = canvas.getContext(\"2d\");
let r = 100;
let money = function (obj, sum) {
for (let i = 0; i < obj.length; i++) {
sum += data[i].money
}
return sum;
}
let totalmoney = money(data, 0);
let nowsum = 0;
let start = 0;
let end = 0;
let R = 100;
let i=0;
data.forEach(function (item) {
ctx.beginPath()
nowsum += item.money;
end = (nowsum / totalmoney)
ctx.moveTo(150, 150);
ctx.arc(150, 150, R, start*Math.PI*2, end*Math.PI*2)
start = end;
//产生随机颜色
ctx.fillStyle = \'#\' + Math.floor(Math.random() * 0xffffff).toString(16);
ctx.rect(350,5+(35*i),30,30);
ctx.font=\"14px 黑体\"
ctx.fillText(item.title,400,25+(35*i))
ctx.strokeStyle = \"gray\"
ctx.fill();
ctx.stroke();
i++;
})
</script>
</body>
</html>
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