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

为什么显示不出来呀？这个代码一模一样

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<canvas id="canvas" width="800" height="800" style="border:1px solid 

#aaa;display:block;margin:50px auto;">当浏览器不支持canvas，请更换浏览器后再试
</canvas>

<script>
var data=[
{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:"#67becf"},
{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"}
]
window.onload = function(){
var canvas = document.getElementById("canvas");

canvas.width = 800;
canvas.height = 800;

var context = canvas.getContext("2d");
//使用context绘制
for(var i = 0; i < data.length ; i++)
draw(data[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();

}

</script>
</body>
</html>