帮我看看用canvas写五角星，这段代码五角星为啥打不出来？

<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<canvas id="canvas" style="border: 1px solid #aaa;display: block;margin: 50px auto">
当前浏览器不支持canvas，请更新浏览器再试
</canvas>
<script>

window.onload=function(){
var canvas=document.getElementById("canvas");
canvas.width=800;
canvas.height=800;
var context=canvas.getContext("2d");

drawStar(context,150,300,400,400,30);

}

function drawStar(cxt,r,R,x,y,rot){
cxt.beginPath();
for(var i=0;i<5;i++){
context.lineTo(Math.cos((18+i*72-rot)/180*Math.PI)*R+x,-Math.sin((18+i*72-rot)/180*Math.PI)*R+y);
context.lineTo(Math.cos((54+i*72-rot)/180*Math.PI)*r+x,-Math.sin((54+i*72-rot)/180*Math.PI)*r+y);

}
cxt.closePath();
cxt.stroke();
}
</script>

墨西哥鸡味卷

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帮我看看用canvas写五角星，这段代码五角星为啥打不出来？

1回答