为何没有效果?
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>canvas</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，请更换浏览器</canvas>
<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:"#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:"#67becf"}
]
alert(tangram);
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();
}
}
}
</script>
</body>
</html>
等待20621回答
-
南吕政
没有添加js和css吧
随时随地看视频慕课网APP
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