                        课程
                    
                        /前端开发
                        
                            /Html5
                        
                        /炫丽的倒计时效果Canvas绘图与动画基础

为什么就显示边框

<DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script>
var tangram=[
{p:[{x:0,y:0},{x:800,y:0},{x:400,y:400}],color:"#caff67"},
{p:[{x:0,y:0},{x:400,y:400},{x:0,y:800}],color:"#67bcef"},
{p:[{x:800,y:0},{x:800,y:400},{x:600,y:600},{x:600,y:200}],color:"#ef3d61"},
{p:[{x:600,y:200},{x:600,y:600},{x:400,y:400}],color:"#f9f51a"},
{p:[{x:400,y:400},{x:600,y:600},{x:400,y:800},{x:200,y:600}],color:"#a594c0"},
{p:[{x:200,y:600},{x:400,y:800},{x:0,y:800}],color:"#fa8ecc"},
{p:[{x:800,y:400},{x:800,y:800},{x:400,y:800}],color:"#f6ca29"}
];

function draw(id) {
var canvas = document.getElementById(id);
if (canvas == null) {
return false;
}
var context = canvas.getContext("2d");
for(var i=0;i<tangram.length;i++) {
draw(tangram[i], context);
}
}
function draw(piece,cxt) {

var cxt=canvas.getContext("2d");

cxt.beginPath();
cxt.moveTo(piece.p[0].x,piece.p[0].y);
for(var i=0;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>
</head>
<body onload="draw('canvas')">
<canvas id="canvas" width="800" height="800"
style="border:1px solid #aaa;
diaplay:block;
margin:50px auto;">

</canvas>

</body>
</html>