线条不对，颜色也不填充，求找bug
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<canvas id="canvas"style="display: block;margin: 0 auto;border: 1px solid #aaa;"></canvas>
<script>
var tangram=[
{p:[{x:0,y:0},{x:0,y:800},{x:400,y:400}],color:"#caff67"},
{p:[{x:0,y:0},{x:400,y:400},{x:800,y:0}],color:"#67becf"},
{p:[{x:0,y:800},{x:400,y:800},{x:600,y:600},{x:200,y:600}],color:"#ef3d61"},
{p:[{x:400,y:800},{x:800,y:800},{x:800,y:400}],color:"#f9f5la"},
{p:[{x:400,y:400},{x:200,y:600},{x:600,y:600}],color:"#a594c0"},
{p:[{x:400,y:400},{x:600,y:600},{x:800,y:400},{x:600,y:200}],color:"#fa8ecc"},
{p:[{x:600,y:200},{x:800,y:400},{x:800,y:0}],color:"#f6ca29"}
]
window.onload=function(){
var canvas=document.getElementById("canvas");
canvas.width=800;
canvas.height=800;
var context=canvas.getContext("2d");
for(var i=0;i<tangram.length;i++){
draw(tangram[i],context);
}
}
function draw(piece,cxt){
cxt.beginPath();
cxt.moveTo(piece.p[0].x,piece.p[0].y);
for(var i=1;i<piece.p.length;i++){
cxt.lineTo(piece.p[i].x,piece.p[i].y);
cxt.closePath();
cxt.fillStyle=piece.color;
cxt.fill();
cxt.strokeStyle="black";
cxt.lineWidth=3;
cxt.stroke();
}
}
</script>
</body>
</html>
