<!DOCTYPE?html>
<html?lang="en">
<head>
??<meta?charset="UTF-8">
??<meta?name="viewport"?content="width=device-width,?initial-scale=1">
??<title>Dva?Demo</title>
??<link?rel="stylesheet"?href="index.css"?/>
</head>
<body>
??<div?id="root">
????<canvas?width="800"?height="800"?id="canvas"></canvas>
??</div>
??<script?src="index.js"></script>
<script>
?let?canvas=document.getElementById('canvas');
?let?context=canvas.getContext('2d');
?context.beginPath();
?for(let?i=0;i<5;i++)?{
????context.lineTo(Math.cos((18+72*i)/180*Math.PI)*300+400,-Math.sin((54+72*i)/180*Math.PI)*300+400);
?context.lineTo(Math.cos((18+72*i)/180*Math.PI)*150+400,-Math.sin((54+72*i)/180*Math.PI)*150+400);
?}
??context.closePath();
?context.lineWidth=10;
?context.stroke();
</script>
</body>
</html>
2018-08-02
哈哈哈，我也是，改一下小圓的起啟度數(shù)就可以
2018-06-17
你把大圓小圓的角度x寫成18,y寫成54了?? ? ??