                        課程
                    
                        /前端開發(fā)
                        
                            /Html5
                        
                        /炫麗的倒計(jì)時(shí)效果Canvas繪圖與動畫基礎(chǔ)

為什么顯示不出來呀？這個(gè)代碼一模一樣

<!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;">當(dāng)瀏覽器不支持canvas，請更換瀏覽器后再試
</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繪制
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>